# coding=utf-8
# Copyright 2020 The Microsoft Authors and The HuggingFace Inc. team.
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# you may not use this file except in compliance with the License.
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#     http://www.apache.org/licenses/LICENSE-2.0
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""" PyTorch ProphetNet model, ported from ProphetNet repo(fairsequery_states version). """

import copy
import math
import warnings
from dataclasses import dataclass
from typing import Dict, Optional, Tuple

import torch
import torch.nn.functional as F
from torch import Tensor, nn
from torch.nn import LayerNorm

from ...activations import ACT2FN
from ...file_utils import (
    ModelOutput,
    add_start_docstrings,
    add_start_docstrings_to_model_forward,
    replace_return_docstrings,
)
from ...modeling_outputs import BaseModelOutput
from ...modeling_utils import PreTrainedModel
from ...utils import logging
from .configuration_prophetnet import ProphetNetConfig


logger = logging.get_logger(__name__)

_CONFIG_FOR_DOC = "ProphenetConfig"
_TOKENIZER_FOR_DOC = "ProphetNetTokenizer"

PROPHETNET_PRETRAINED_MODEL_ARCHIVE_LIST = [
    "microsoft/prophetnet-large-uncased",
    # See all ProphetNet models at https://huggingface.co/models?filter=prophetnet
]


PROPHETNET_START_DOCSTRING = r"""
    This model inherits from :class:`~transformers.PreTrainedModel`. Check the superclass documentation for the generic
    methods the library implements for all its model (such as downloading or saving, resizing the input embeddings,
    pruning heads etc.)

    Original ProphetNet code can be found at <https://github.com/microsoft/ProphetNet> . Checkpoints were converted
    from original Fairseq checkpoints. For more information on the checkpoint conversion, please take a look at the
    file ``convert_prophetnet_original_pytorch_checkpoint_to_pytorch.py``.

    This model is a PyTorch `torch.nn.Module <https://pytorch.org/docs/stable/nn.html#torch.nn.Module>`_ sub-class. Use
    it as a regular PyTorch Module and refer to the PyTorch documentation for all matters related to general usage and
    behavior.

    Parameters:
        config (:class:`~transformers.ProphetNetConfig`): Model configuration class with all the parameters of the model.
            Initializing with a config file does not load the weights associated with the model, only the
            configuration. Check out the :meth:`~transformers.PreTrainedModel.from_pretrained` method to load the model
            weights.
"""

PROPHETNET_INPUTS_DOCSTRING = r"""
    Args:
        input_ids (:obj:`torch.LongTensor` of shape :obj:`(batch_size, sequence_length)`):
            Indices of input sequence tokens in the vocabulary. Padding will be ignored by default should you provide
            it.

            Indices can be obtained using :class:`~transformers.ProphetNetTokenizer`. See
            :meth:`transformers.PreTrainedTokenizer.encode` and :meth:`transformers.PreTrainedTokenizer.__call__` for
            details.

            `What are input IDs? <../glossary.html#input-ids>`__
        attention_mask (:obj:`torch.Tensor` of shape :obj:`(batch_size, sequence_length)`, `optional`):
            Mask to avoid performing attention on padding token indices. Mask values selected in ``[0, 1]``:

            - 1 for tokens that are **not masked**,
            - 0 for tokens that are **masked**.

            `What are attention masks? <../glossary.html#attention-mask>`__
        decoder_input_ids (:obj:`torch.LongTensor` of shape :obj:`(batch_size, target_sequence_length)`, `optional`):
            Indices of decoder input sequence tokens in the vocabulary.

            Indices can be obtained using :class:`~transformers.PreTrainedTokenizer`. See
            :meth:`transformers.PreTrainedTokenizer.encode` and :meth:`transformers.PreTrainedTokenizer.__call__` for
            details.

            `What are input IDs? <../glossary.html#input-ids>`__

            ProphetNet uses the :obj:`eos_token_id` as the starting token for :obj:`decoder_input_ids` generation. If
            :obj:`past_key_values` is used, optionally only the last :obj:`decoder_input_ids` have to be input (see
            :obj:`past_key_values`).

        decoder_attention_mask (:obj:`torch.BoolTensor` of shape :obj:`(batch_size, target_sequence_length)`, `optional`):
            Default behavior: generate a tensor that ignores pad tokens in :obj:`decoder_input_ids`. Causal mask will
            also be used by default.

            If you want to change padding behavior, you should read :func:`modeling_bart._prepare_decoder_inputs` and
            modify to your needs. See diagram 1 in `the paper <https://arxiv.org/abs/1910.13461>`__ for more
            information on the default strategy.
        encoder_outputs (:obj:`tuple(tuple(torch.FloatTensor)`, `optional`):
            Tuple consists of (:obj:`last_hidden_state`, `optional`: :obj:`hidden_states`, `optional`:
            :obj:`attentions`) :obj:`last_hidden_state` of shape :obj:`(batch_size, sequence_length, hidden_size)`,
            `optional`) is a sequence of hidden-states at the output of the last layer of the encoder. Used in the
            cross-attention of the decoder.
        past_key_values (:obj:`tuple(tuple(torch.FloatTensor))` of length :obj:`config.n_layers` with each tuple having 4 tensors of shape :obj:`(batch_size, num_heads, sequence_length - 1, embed_size_per_head)`):
            Contains precomputed key and value hidden-states of the attention blocks. Can be used to speed up decoding.

            If :obj:`past_key_values` are used, the user can optionally input only the last ``decoder_input_ids``
            (those that don't have their past key value states given to this model) of shape :obj:`(batch_size, 1)`
            instead of all ``decoder_input_ids`` of shape :obj:`(batch_size, sequence_length)`.
        use_cache (:obj:`bool`, `optional`):
            If set to :obj:`True`, :obj:`past_key_values` key value states are returned and can be used to speed up
            decoding (see :obj:`past_key_values`).
        output_attentions (:obj:`bool`, `optional`):
            Whether or not to return the attentions tensors of all attention layers. See ``attentions`` under returned
            tensors for more detail.
        output_hidden_states (:obj:`bool`, `optional`):
            Whether or not to return the hidden states of all layers. See ``hidden_states`` under returned tensors for
            more detail.
        return_dict (:obj:`bool`, `optional`):
            Whether or not to return a :class:`~transformers.file_utils.ModelOutput` instead of a plain tuple.
"""

PROPHETNET_STANDALONE_INPUTS_DOCSTRING = r"""
    Args:
        input_ids (:obj:`torch.LongTensor` of shape :obj:`(batch_size, sequence_length)`):
            Indices of input sequence tokens in the vocabulary. Padding will be ignored by default should you provide
            it.

            Indices can be obtained using :class:`~transformers.ProphetNetTokenizer`. See
            :meth:`transformers.PreTrainedTokenizer.encode` and :meth:`transformers.PreTrainedTokenizer.__call__` for
            details.

            `What are input IDs? <../glossary.html#input-ids>`__
        attention_mask (:obj:`torch.Tensor` of shape :obj:`(batch_size, sequence_length)`, `optional`):
            Mask to avoid performing attention on padding token indices. Mask values selected in ``[0, 1]``:

            - 1 for tokens that are **not masked**,
            - 0 for tokens that are **masked**.

            `What are attention masks? <../glossary.html#attention-mask>`__
        output_attentions (:obj:`bool`, `optional`):
            Whether or not to return the attentions tensors of all attention layers. See ``attentions`` under returned
            tensors for more detail.
        output_hidden_states (:obj:`bool`, `optional`):
            Whether or not to return the hidden states of all layers. See ``hidden_states`` under returned tensors for
            more detail.
        return_dict (:obj:`bool`, `optional`):
            Whether or not to return a :class:`~transformers.file_utils.ModelOutput` instead of a plain tuple.
"""


def softmax(hidden_state, dim, onnx_trace=False):
    if onnx_trace:
        return F.softmax(hidden_state.float(), dim=dim)
    else:
        return F.softmax(hidden_state, dim=dim, dtype=torch.float32)


def ngram_attention_bias(sequence_length, ngram, device, dtype):
    """
    This function computes the bias for the predict stream
    """
    left_block = torch.ones((ngram, sequence_length, sequence_length), device=device, dtype=dtype) * float("-inf")
    right_block = left_block.detach().clone()
    # create bias
    for stream_idx in range(ngram):
        right_block[stream_idx].fill_diagonal_(0, wrap=False)
        left_block[stream_idx].triu_(-stream_idx + 1)

    left_block[:, :, 0] = 0
    return torch.cat([left_block, right_block], dim=2)


def compute_relative_buckets(num_buckets, max_distance, relative_positions, is_bidirectional=False):
    """
    This function computes individual parts of the relative position buckets. For more detail, see paper.
    """
    inv_relative_positions = -relative_positions
    rel_positions_bucket = 0

    if is_bidirectional:
        num_buckets = num_buckets // 2
        rel_positions_bucket = (
            rel_positions_bucket
            + torch.lt(inv_relative_positions, torch.zeros_like(inv_relative_positions)).int() * num_buckets
        )
        inv_relative_positions = torch.abs(inv_relative_positions)
    else:
        inv_relative_positions = torch.max(inv_relative_positions, torch.zeros_like(inv_relative_positions))

    max_exact = num_buckets // 2
    is_small = torch.lt(inv_relative_positions, max_exact)
    val_if_large = max_exact + torch.log(inv_relative_positions.float() / max_exact) / math.log(
        max_distance / max_exact
    ) * (num_buckets - max_exact)
    val_if_large = torch.min(val_if_large, torch.ones_like(val_if_large) * (num_buckets - 1)).int()
    rel_positions_bucket = rel_positions_bucket + torch.where(is_small, inv_relative_positions.int(), val_if_large)
    return rel_positions_bucket


def compute_all_stream_relative_buckets(num_buckets, max_distance, position_ids):
    """
    This function computes both main and predict relative position buckets. For more detail, see paper.
    """
    # main stream
    main_stream_relative_positions = position_ids.unsqueeze(1).repeat(1, position_ids.size(-1), 1)
    main_stream_relative_positions = main_stream_relative_positions - position_ids.unsqueeze(-1)

    # predicting stream
    predicting_stream_relative_positions = torch.cat((position_ids - 1, position_ids), dim=-1).unsqueeze(1)
    predicting_stream_relative_positions = predicting_stream_relative_positions.repeat(1, position_ids.size(-1), 1)
    predicting_stream_relative_positions = predicting_stream_relative_positions - position_ids.unsqueeze(-1)

    # get both position buckets
    main_relative_position_buckets = compute_relative_buckets(
        num_buckets, max_distance, main_stream_relative_positions, is_bidirectional=False
    )
    predict_relative_position_buckets = compute_relative_buckets(
        num_buckets, max_distance, predicting_stream_relative_positions, is_bidirectional=False
    )
    return main_relative_position_buckets, predict_relative_position_buckets


@dataclass
class ProphetNetSeq2SeqLMOutput(ModelOutput):
    """
    Base class for sequence-to-sequence language models outputs.

    Args:
        loss (:obj:`torch.FloatTensor` of shape :obj:`(1,)`, `optional`, returned when :obj:`labels` is provided):
            Language modeling loss.
        logits (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, decoder_sequence_length, config.vocab_size)`):
            Prediction scores of the main stream language modeling head (scores for each vocabulary token before
            SoftMax).
        logits_ngram (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, ngram * decoder_sequence_length, config.vocab_size)`):
            Prediction scores of the predict stream language modeling head (scores for each vocabulary token before
            SoftMax).
        past_key_values (:obj:`List[torch.FloatTensor]`, `optional`, returned when ``use_cache=True`` is passed or when ``config.use_cache=True``):
            List of :obj:`torch.FloatTensor` of length :obj:`config.n_layers`, with each tensor of shape :obj:`(2,
            batch_size, num_attn_heads, decoder_sequence_length, embed_size_per_head)`).

            Contains pre-computed hidden-states (key and values in the attention blocks) of the decoder that can be
            used (see :obj:`past_key_values` input) to speed up sequential decoding.
        decoder_hidden_states (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_hidden_states=True`` is passed or when ``config.output_hidden_states=True``):
            Tuple of :obj:`torch.FloatTensor` (one for the output of the embeddings + one for the output of each layer)
            of shape :obj:`(batch_size, decoder_sequence_length, hidden_size)`.

            Hidden-states of main stream of the decoder at the output of each layer plus the initial embedding outputs.
        decoder_ngram_hidden_states (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_hidden_states=True`` is passed or when ``config.output_hidden_states=True``):
            Tuple of :obj:`torch.FloatTensor` (one for the output of the embeddings + one for the output of each layer)
            of shape :obj:`(batch_size, ngram * decoder_sequence_length, hidden_size)`.

            Hidden-states of the predict stream of the decoder at the output of each layer plus the initial embedding
            outputs.
        decoder_attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``):
            Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_attn_heads,
            decoder_sequence_length, decoder_sequence_length)`.

            Attentions weights of the decoder, after the attention softmax, used to compute the weighted average in the
            self-attention heads.
        decoder_ngram_attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``):
            Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_attn_heads,
            decoder_sequence_length, decoder_sequence_length)`.

            Attentions weights of the predict stream of the decoder, after the attention softmax, used to compute the
            weighted average in the self-attention heads.
        cross_attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``):
            Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_attn_heads,
            encoder_sequence_length, decoder_sequence_length)`.

            Attentions weights of the cross-attention layer of the decoder, after the attention softmax, used to
            compute the weighted average in the
        encoder_last_hidden_state (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, encoder_sequence_length, hidden_size)`, `optional`):
            Sequence of hidden-states at the output of the last layer of the encoder of the model.
        encoder_hidden_states (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_hidden_states=True`` is passed or when ``config.output_hidden_states=True``):
            Tuple of :obj:`torch.FloatTensor` (one for the output of the embeddings + one for the output of each layer)
            of shape :obj:`(batch_size, encoder_sequence_length, hidden_size)`.

            Hidden-states of the encoder at the output of each layer plus the initial embedding outputs.
        encoder_attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``):
            Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_attn_heads,
            encoder_sequence_length, encoder_sequence_length)`. Attentions weights of the encoder, after the attention
            softmax, used to compute the weighted average in the self-attention heads.
    """

    loss: Optional[torch.FloatTensor] = None
    logits: torch.FloatTensor = None
    logits_ngram: Optional[torch.FloatTensor] = None
    past_key_values: Optional[Tuple[torch.FloatTensor]] = None
    decoder_hidden_states: Optional[Tuple[torch.FloatTensor]] = None
    decoder_ngram_hidden_states: Optional[Tuple[torch.FloatTensor]] = None
    decoder_attentions: Optional[Tuple[torch.FloatTensor]] = None
    decoder_ngram_attentions: Optional[Tuple[torch.FloatTensor]] = None
    cross_attentions: Optional[Tuple[torch.FloatTensor]] = None
    encoder_last_hidden_state: Optional[torch.FloatTensor] = None
    encoder_hidden_states: Optional[Tuple[torch.FloatTensor]] = None
    encoder_attentions: Optional[Tuple[torch.FloatTensor]] = None

    @property
    def decoder_cross_attentions(self):
        warnings.warn(
            "`decoder_cross_attentions` is deprecated and will be removed soon. Please use `cross_attentions` instead.",
            FutureWarning,
        )
        return self.cross_attentions


@dataclass
class ProphetNetSeq2SeqModelOutput(ModelOutput):
    """
    Base class for model encoder's outputs that also contains : pre-computed hidden states that can speed up sequential
    decoding.

    Args:
        last_hidden_state (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, decoder_sequence_length, hidden_size)`):
            Sequence of main stream hidden-states at the output of the last layer of the decoder of the model.

            If :obj:`past_key_values` is used only the last hidden-state of the sequences of shape :obj:`(batch_size,
            1, hidden_size)` is output.
        last_hidden_state_ngram (:obj:`torch.FloatTensor` of shape :obj:`(batch_size,ngram * decoder_sequence_length, config.vocab_size)`):
            Sequence of predict stream hidden-states at the output of the last layer of the decoder of the model.
        past_key_values (:obj:`List[torch.FloatTensor]`, `optional`, returned when ``use_cache=True`` is passed or when ``config.use_cache=True``):
            List of :obj:`torch.FloatTensor` of length :obj:`config.n_layers`, with each tensor of shape :obj:`(2,
            batch_size, num_attn_heads, decoder_sequence_length, embed_size_per_head)`).

            Contains pre-computed hidden-states (key and values in the attention blocks) of the decoder that can be
            used (see :obj:`past_key_values` input) to speed up sequential decoding.
        decoder_hidden_states (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_hidden_states=True`` is passed or when ``config.output_hidden_states=True``):
            Tuple of :obj:`torch.FloatTensor` (one for the output of the embeddings + one for the output of each layer)
            of shape :obj:`(batch_size, decoder_sequence_length, hidden_size)`.

            Hidden-states of main stream of the decoder at the output of each layer plus the initial embedding outputs.
        decoder_ngram_hidden_states (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_hidden_states=True`` is passed or when ``config.output_hidden_states=True``):
            Tuple of :obj:`torch.FloatTensor` (one for the output of the embeddings + one for the output of each layer)
            of shape :obj:`(batch_size, ngram * decoder_sequence_length, hidden_size)`.

            Hidden-states of the predict stream of the decoder at the output of each layer plus the initial embedding
            outputs.
        decoder_attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``):
            Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_attn_heads,
            decoder_sequence_length, decoder_sequence_length)`.

            Attentions weights of the decoder, after the attention softmax, used to compute the weighted average in the
            self-attention heads.
        decoder_ngram_attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``):
            Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_attn_heads,
            decoder_sequence_length, decoder_sequence_length)`.

            Attentions weights of the predict stream of the decoder, after the attention softmax, used to compute the
            weighted average in the
        cross_attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``):
            Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_attn_heads,
            encoder_sequence_length, decoder_sequence_length)`.

            Attentions weights of the cross-attention layer of the decoder, after the attention softmax, used to
            compute the weighted average in the
        encoder_last_hidden_state (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, encoder_sequence_length, hidden_size)`, `optional`):
            Sequence of hidden-states at the output of the last layer of the encoder of the model.
        encoder_hidden_states (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_hidden_states=True`` is passed or when ``config.output_hidden_states=True``):
            Tuple of :obj:`torch.FloatTensor` (one for the output of the embeddings + one for the output of each layer)
            of shape :obj:`(batch_size, encoder_sequence_length, hidden_size)`.

            Hidden-states of the encoder at the output of each layer plus the initial embedding outputs.
        encoder_attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``):
            Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_attn_heads,
            encoder_sequence_length, encoder_sequence_length)`.

            Attentions weights of the encoder, after the attention softmax, used to compute the weighted average in the
            self-attention heads.
    """

    last_hidden_state: torch.FloatTensor
    last_hidden_state_ngram: Optional[torch.FloatTensor] = None
    past_key_values: Optional[Tuple[torch.FloatTensor]] = None
    decoder_hidden_states: Optional[Tuple[torch.FloatTensor]] = None
    decoder_ngram_hidden_states: Optional[Tuple[torch.FloatTensor]] = None
    decoder_attentions: Optional[Tuple[torch.FloatTensor]] = None
    decoder_ngram_attentions: Optional[Tuple[torch.FloatTensor]] = None
    cross_attentions: Optional[Tuple[torch.FloatTensor]] = None
    encoder_last_hidden_state: Optional[torch.FloatTensor] = None
    encoder_hidden_states: Optional[Tuple[torch.FloatTensor]] = None
    encoder_attentions: Optional[Tuple[torch.FloatTensor]] = None

    @property
    def decoder_cross_attentions(self):
        warnings.warn(
            "`decoder_cross_attentions` is deprecated and will be removed soon. Please use `cross_attentions` instead.",
            FutureWarning,
        )
        return self.cross_attentions


@dataclass
class ProphetNetDecoderModelOutput(ModelOutput):
    """
    Base class for model's outputs that may also contain a past key/values (to speed up sequential decoding).

    Args:
        last_hidden_state (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, decoder_sequence_length, hidden_size)`):
            Sequence of main stream hidden-states at the output of the last layer of the decoder of the model.

            If :obj:`past_key_values` is used only the last hidden-state of the sequences of shape :obj:`(batch_size,
            1, hidden_size)` is output.
        last_hidden_state_ngram (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, ngram * decoder_sequence_length, config.vocab_size)`):
            Sequence of predict stream hidden-states at the output of the last layer of the decoder of the model.
        past_key_values (:obj:`List[torch.FloatTensor]`, `optional`, returned when ``use_cache=True`` is passed or when ``config.use_cache=True``):
            List of :obj:`torch.FloatTensor` of length :obj:`config.n_layers`, with each tensor of shape :obj:`(2,
            batch_size, num_attn_heads, decoder_sequence_length, embed_size_per_head)`).

            Contains pre-computed hidden-states (key and values in the attention blocks) of the decoder that can be
            used (see :obj:`past_key_values` input) to speed up sequential decoding.
        hidden_states (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_hidden_states=True`` is passed or when ``config.output_hidden_states=True``):
            Tuple of :obj:`torch.FloatTensor` (one for the output of the embeddings + one for the output of each layer)
            of shape :obj:`(batch_size, decoder_sequence_length, hidden_size)`.

            Hidden-states of main stream of the decoder at the output of each layer plus the initial embedding outputs.
        ngram_hidden_states (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_hidden_states=True`` is passed or when ``config.output_hidden_states=True``):
            Tuple of :obj:`torch.FloatTensor` (one for the output of the embeddings + one for the output of each layer)
            of shape :obj:`(batch_size, ngram * decoder_sequence_length, hidden_size)`.

            Hidden-states of the predict stream of the decoder at the output of each layer plus the initial embedding
            outputs.
        attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``):
            Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_attn_heads,
            decoder_sequence_length, decoder_sequence_length)`.

            Attentions weights of the decoder, after the attention softmax, used to compute the weighted average in the
            self-attention heads.
        ngram_attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``):
            Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_attn_heads,
            decoder_sequence_length, decoder_sequence_length)`.

            Attentions weights of the predict stream of the decoder, after the attention softmax, used to compute the
            weighted average in the
        cross_attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``):
            Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_attn_heads,
            encoder_sequence_length, decoder_sequence_length)`.

            Attentions weights of the cross-attention layer of the decoder, after the attention softmax, used to
            compute the weighted average in the
    """

    last_hidden_state: torch.FloatTensor
    last_hidden_state_ngram: Optional[torch.FloatTensor] = None
    past_key_values: Optional[Tuple[torch.FloatTensor]] = None
    hidden_states: Optional[Tuple[torch.FloatTensor]] = None
    hidden_states_ngram: Optional[Tuple[torch.FloatTensor]] = None
    attentions: Optional[Tuple[torch.FloatTensor]] = None
    ngram_attentions: Optional[Tuple[torch.FloatTensor]] = None
    cross_attentions: Optional[Tuple[torch.FloatTensor]] = None


@dataclass
class ProphetNetDecoderLMOutput(ModelOutput):
    """
    Base class for model's outputs that may also contain a past key/values (to speed up sequential decoding).

    Args:
        loss (:obj:`torch.FloatTensor` of shape :obj:`(1,)`, `optional`, returned when :obj:`labels` is provided):
            Language modeling loss.
        logits (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, decoder_sequence_length, config.vocab_size)`):
            Prediction scores of the main stream language modeling head (scores for each vocabulary token before
            SoftMax).
        logits_ngram (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, ngram * decoder_sequence_length, config.vocab_size)`):
            Prediction scores of the predict stream language modeling head (scores for each vocabulary token before
            SoftMax).
        past_key_values (:obj:`List[torch.FloatTensor]`, `optional`, returned when ``use_cache=True`` is passed or when ``config.use_cache=True``):
            List of :obj:`torch.FloatTensor` of length :obj:`config.n_layers`, with each tensor of shape :obj:`(2,
            batch_size, num_attn_heads, decoder_sequence_length, embed_size_per_head)`).

            Contains pre-computed hidden-states (key and values in the attention blocks) of the decoder that can be
            used (see :obj:`past_key_values` input) to speed up sequential decoding.
        hidden_states (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_hidden_states=True`` is passed or when ``config.output_hidden_states=True``):
            Tuple of :obj:`torch.FloatTensor` (one for the output of the embeddings + one for the output of each layer)
            of shape :obj:`(batch_size, decoder_sequence_length, hidden_size)`.

            Hidden-states of main stream of the decoder at the output of each layer plus the initial embedding outputs.
        ngram_hidden_states (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_hidden_states=True`` is passed or when ``config.output_hidden_states=True``):
            Tuple of :obj:`torch.FloatTensor` (one for the output of the embeddings + one for the output of each layer)
            of shape :obj:`(batch_size, ngram * decoder_sequence_length, hidden_size)`.

            Hidden-states of the predict stream of the decoder at the output of each layer plus the initial embedding
            outputs.
        attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``):
            Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_attn_heads,
            decoder_sequence_length, decoder_sequence_length)`.

            Attentions weights of the decoder, after the attention softmax, used to compute the weighted average in the
            self-attention heads.
        ngram_attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``):
            Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_attn_heads,
            decoder_sequence_length, decoder_sequence_length)`.

            Attentions weights of the predict stream of the decoder, after the attention softmax, used to compute the
            weighted average in the
        cross_attentions (:obj:`tuple(torch.FloatTensor)`, `optional`, returned when ``output_attentions=True`` is passed or when ``config.output_attentions=True``):
            Tuple of :obj:`torch.FloatTensor` (one for each layer) of shape :obj:`(batch_size, num_attn_heads,
            encoder_sequence_length, decoder_sequence_length)`.

            Attentions weights of the cross-attention layer of the decoder, after the attention softmax, used to
            compute the weighted average in the
    """

    loss: Optional[torch.FloatTensor] = None
    logits: torch.FloatTensor = None
    logits_ngram: Optional[torch.FloatTensor] = None
    past_key_values: Optional[Tuple[torch.FloatTensor]] = None
    hidden_states: Optional[Tuple[torch.FloatTensor]] = None
    hidden_states_ngram: Optional[Tuple[torch.FloatTensor]] = None
    attentions: Optional[Tuple[torch.FloatTensor]] = None
    ngram_attentions: Optional[Tuple[torch.FloatTensor]] = None
    cross_attentions: Optional[Tuple[torch.FloatTensor]] = None


class ProphetNetPreTrainedModel(PreTrainedModel):
    config_class = ProphetNetConfig
    base_model_prefix = "prophetnet"

    def _init_weights(self, module):
        if isinstance(module, nn.Linear):
            module.weight.data.normal_(mean=0.0, std=self.config.init_std)
            if module.bias is not None:
                module.bias.data.zero_()
        elif isinstance(module, nn.Embedding):
            module.weight.data.normal_(mean=0.0, std=self.config.init_std)
            if module.padding_idx is not None:
                module.weight.data[module.padding_idx].zero_()

    def _shift_right(self, input_ids):
        decoder_start_token_id = self.config.decoder_start_token_id
        pad_token_id = self.config.pad_token_id

        assert (
            decoder_start_token_id is not None
        ), "self.model.config.decoder_start_token_id has to be defined. In ProphetNet it is usually set to the pad_token_id. See ProphetNet docs for more information"

        # shift inputs to the right
        shifted_input_ids = input_ids.new_zeros(input_ids.shape)
        shifted_input_ids[..., 1:] = input_ids[..., :-1].clone()
        shifted_input_ids[..., 0] = decoder_start_token_id

        assert pad_token_id is not None, "self.model.config.pad_token_id has to be defined."
        # replace possible -100 values in labels by `pad_token_id`
        shifted_input_ids.masked_fill_(shifted_input_ids == -100, pad_token_id)

        assert torch.all(shifted_input_ids >= 0).item(), "Verify that `shifted_input_ids` has only positive values"

        return shifted_input_ids


class ProphetNetPositionalEmbeddings(nn.Embedding):
    """
    This module learns positional embeddings up to a fixed maximum size. Padding ids are ignored by either offsetting
    based on padding_idx or by setting padding_idx to None and ensuring that the appropriate position ids are passed to
    the forward function.
    """

    def __init__(self, config: ProphetNetConfig):
        super().__init__(config.max_position_embeddings, config.hidden_size, config.pad_token_id)

    def forward(self, inputs_shape, device, attention_mask=None, past_key_values=None, position_ids=None):
        assert (position_ids is None) or (
            self.padding_idx is None
        ), "If position_ids is pre-computed then padding_idx should not be set."

        if position_ids is None:
            if past_key_values is not None:
                # position_ids is the same for every token when decoding a single step
                # Without the int() cast, it doesn't work in some cases when exporting to ONNX
                prev_num_input_ids = past_key_values[0]["self"]["prev_key_states"].shape[2]
                num_input_ids = inputs_shape[1] + prev_num_input_ids
                position_ids = torch.ones((1, 1), dtype=torch.long, device=device) * (
                    int(self.padding_idx + num_input_ids)
                )
            else:
                if attention_mask is None:
                    attention_mask = torch.ones(inputs_shape, dtype=torch.long, device=device)

                # retrieve position_ids from input_ids / attention_mask
                position_ids = (
                    torch.cumsum(attention_mask, dim=1).type_as(attention_mask) * attention_mask
                ).long() + self.padding_idx

        return super().forward(position_ids), position_ids

    def _forward(self, position_ids):
        return super().forward(position_ids)


class ProphetNetAttention(nn.Module):
    """Multi-headed attention from 'Attention Is All You Need' paper"""

    def __init__(
        self,
        config: ProphetNetConfig,
        num_attn_heads: int,
    ):
        super().__init__()
        hidden_size = config.hidden_size

        self.attention_dropout = config.attention_dropout
        self.dropout = config.dropout
        self.num_attn_heads = num_attn_heads
        self.head_dim = hidden_size // num_attn_heads

        assert (
            self.head_dim * num_attn_heads == hidden_size
        ), "`config.hidden_size` must be divisible by `config.num_encoder_attention_heads` and `config.num_decoder_attention_heads`"

        self.key_proj = nn.Linear(hidden_size, hidden_size)
        self.value_proj = nn.Linear(hidden_size, hidden_size)
        self.query_proj = nn.Linear(hidden_size, hidden_size)

        self.out_proj = nn.Linear(hidden_size, hidden_size)

    def _reshape(self, tensor, first_dim, batch_size):
        return tensor.reshape(first_dim, batch_size * self.num_attn_heads, self.head_dim).transpose(0, 1)

    def forward(
        self,
        hidden_states,
        key_value_states: Optional[Tensor] = None,
        attention_mask: Optional[Tensor] = None,
        layer_state: Optional[Dict[str, Optional[Tensor]]] = None,
    ) -> Tuple[Tensor, Optional[Tensor]]:

        sequence_length, batch_size, hidden_size = hidden_states.size()

        # if key_value_states are provided this layer is used as a cross-attention layer
        # for the decoder
        is_cross_attention = key_value_states is not None
        cache_key = "cross_attention" if is_cross_attention else "self"
        assert list(hidden_states.size()) == [
            sequence_length,
            batch_size,
            hidden_size,
        ], f"Size of hidden states should be {sequence_length, batch_size, hidden_size}, but is {hidden_states.size()}"

        # previous time steps are cached - no need to recompute key and value if they are static
        if layer_state is not None:
            saved_state = layer_state.get(cache_key, None)

        query_states = self.query_proj(hidden_states) / (self.head_dim ** 0.5)
        query_states = self._reshape(query_states, sequence_length, batch_size)

        if not is_cross_attention:
            # self-attention
            key_states = self.key_proj(hidden_states)
            key_states = self._reshape(key_states, -1, batch_size)
            value_states = self.value_proj(hidden_states)
            value_states = self._reshape(value_states, -1, batch_size)
        elif saved_state is None:
            # cross-attention without layer state
            key_states = self.key_proj(key_value_states)
            key_states = self._reshape(key_states, -1, batch_size)
            value_states = self.value_proj(key_value_states)
            value_states = self._reshape(value_states, -1, batch_size)
        else:
            key_states = saved_state["prev_key_states"].view(batch_size * self.num_attn_heads, -1, self.head_dim)
            value_states = saved_state["prev_value_states"].view(batch_size * self.num_attn_heads, -1, self.head_dim)

        # Update cache
        if is_cross_attention:
            layer_state[cache_key] = {
                "prev_key_states": key_states.view(batch_size, self.num_attn_heads, -1, self.head_dim),
                "prev_value_states": value_states.view(batch_size, self.num_attn_heads, -1, self.head_dim),
            }

        key_sequence_length = key_states.size(1)
        attn_weights = torch.bmm(query_states, key_states.transpose(1, 2))
        assert attn_weights.size() == (
            batch_size * self.num_attn_heads,
            sequence_length,
            key_sequence_length,
        ), f"`attn_weights` should be of size {batch_size * self.num_attn_heads, sequence_length, key_sequence_length}, but is of size {attn_weights.shape}"

        # This is part of a workaround to get around fork/join parallelism not supporting Optional types.
        if attention_mask is not None and attention_mask.dim() == 0:
            attention_mask = None
        assert attention_mask is None or attention_mask.size() == (
            self.num_attn_heads * batch_size,
            1,
            key_sequence_length,
        ), f"`attention_mask` should be `None` or of shape attention_mask.size() == {batch_size * self.num_attn_heads, 1, key_sequence_length}, but is {attention_mask.shape}"

        if attention_mask is not None:  # don't attend to padding symbols
            attn_weights = attn_weights + attention_mask

        # need two reshapes to keep gradient at attention weights
        attn_weights_reshaped = attn_weights.view(
            batch_size, self.num_attn_heads, sequence_length, key_sequence_length
        )
        attn_weights = attn_weights_reshaped.view(
            batch_size * self.num_attn_heads, sequence_length, key_sequence_length
        )

        attn_weights = F.softmax(attn_weights, dim=-1)
        attn_probs = F.dropout(
            attn_weights,
            p=self.attention_dropout,
            training=self.training,
        )

        attn_output = torch.bmm(attn_probs, value_states)
        assert attn_output.size() == (
            batch_size * self.num_attn_heads,
            sequence_length,
            self.head_dim,
        ), "`attn_output` should be of shape {batch_size * self.num_attn_heads, sequence_length, self.head_dim}, but is of shape {attn_output.size()}"
        attn_output = attn_output.transpose(0, 1).contiguous().view(sequence_length, batch_size, hidden_size)

        attn_output = self.out_proj(attn_output)

        attn_output = F.dropout(attn_output, p=self.dropout, training=self.training)
        return attn_output, attn_weights_reshaped


class ProphetNetFeedForward(nn.Module):
    """
    This is the residual two feed-forward layer block based on the original Transformer implementation.
    """

    def __init__(self, config: ProphetNetConfig, ffn_dim: int):
        super().__init__()
        self.activation_fn = ACT2FN[config.activation_function]
        self.intermediate = nn.Linear(config.hidden_size, ffn_dim)
        self.output = nn.Linear(ffn_dim, config.hidden_size)
        self.activation_dropout = config.activation_dropout
        self.dropout = config.dropout

    def forward(self, hidden_states):
        hidden_states = self.intermediate(hidden_states)
        hidden_states = self.activation_fn(hidden_states)

        hidden_states = F.dropout(hidden_states, p=self.activation_dropout, training=self.training)
        hidden_states = self.output(hidden_states)
        hidden_states = F.dropout(hidden_states, p=self.dropout, training=self.training)
        return hidden_states


class ProphetNetNgramSelfAttention(nn.Module):
    def __init__(self, config: ProphetNetConfig):
        super().__init__()
        self.hidden_size = config.hidden_size

        self.num_buckets = config.num_buckets
        self.relative_max_distance = config.relative_max_distance
        self.num_attn_heads = config.num_decoder_attention_heads
        self.dropout = config.dropout
        self.attention_dropout = config.attention_dropout
        self.head_dim = config.hidden_size // self.num_attn_heads
        self.ngram = config.ngram

        assert (
            self.head_dim * self.num_attn_heads == config.hidden_size
        ), "config.hidden_size must be divisible by num_attn_heads"
        # key, value, query projection
        self.key_proj = nn.Linear(config.hidden_size, config.hidden_size)
        self.value_proj = nn.Linear(config.hidden_size, config.hidden_size)
        self.query_proj = nn.Linear(config.hidden_size, config.hidden_size)

        # out projection
        self.out_proj = nn.Linear(config.hidden_size, config.hidden_size)

        # rel position embeddings
        self.relative_pos_embeddings = nn.Linear(config.hidden_size, self.num_buckets * self.num_attn_heads)

        # for onnx runtime
        self.onnx_trace = False

    def _reshape(self, tensor, first_dim, batch_size):
        return tensor.reshape(first_dim, batch_size * self.num_attn_heads, self.head_dim).transpose(0, 1)

    def prepare_for_onnx_export_(self):
        self.onnx_trace = True

    def forward(
        self,
        hidden_states,
        layer_state=None,
        attention_mask=None,
        extended_predict_attention_mask=None,
        main_relative_position_buckets=None,
        predict_relative_position_buckets=None,
        position_ids=None,
    ):
        sequence_length, batch_size, hidden_size = hidden_states.size()

        assert list(hidden_states.size()) == [
            sequence_length,
            batch_size,
            hidden_size,
        ], f"`hidden_states` should be of shape {sequence_length, batch_size, hidden_size}, but is of shape {hidden_states.shape}"

        # key and value of previous time steps are cached
        saved_state = layer_state.get("self", None)

        # project
        query_states = self.query_proj(hidden_states)
        key_states = self.key_proj(hidden_states)
        value_states = self.value_proj(hidden_states)

        # normalize
        query_states = query_states / (self.head_dim ** 0.5)

        # reshape
        query_states = self._reshape(query_states, sequence_length, batch_size)
        key_states = self._reshape(key_states, -1, batch_size)
        value_states = self._reshape(value_states, -1, batch_size)

        # chunk into main stream and predict stream
        hidden_states_list = hidden_states.chunk(1 + self.ngram, dim=0)

        query_states_list = query_states.chunk(1 + self.ngram, dim=1)
        key_states_list = key_states.chunk(1 + self.ngram, dim=1)
        value_states_list = value_states.chunk(1 + self.ngram, dim=1)

        main_hidden_states, hidden_states_predict_list = hidden_states_list[0], hidden_states_list[1:]
        main_query_states, predict_query_states_list = query_states_list[0], query_states_list[1:]
        main_key_states, predict_key_states_list = key_states_list[0], key_states_list[1:]
        main_value_states, predict_value_states_list = value_states_list[0], value_states_list[1:]

        # saved states are stored with shape (batch_size, num_attn_heads, seq_len, head_dim)
        if saved_state is not None:
            prev_main_key_states = saved_state["prev_key_states"].view(
                batch_size * self.num_attn_heads, -1, self.head_dim
            )
            main_key_states = torch.cat((prev_main_key_states, main_key_states), dim=1)
            prev_main_value_states = saved_state["prev_value_states"].view(
                batch_size * self.num_attn_heads, -1, self.head_dim
            )
            main_value_states = torch.cat((prev_main_value_states, main_value_states), dim=1)

        # Update cache
        layer_state["self"] = {
            "prev_key_states": main_key_states.view(batch_size, self.num_attn_heads, -1, self.head_dim),
            "prev_value_states": main_value_states.view(batch_size, self.num_attn_heads, -1, self.head_dim),
        }

        # get seq_length of main stream only
        main_sequence_length = sequence_length // (1 + self.ngram)

        # MAIN-STREAM
        # main attn weights
        main_attn_weights = torch.bmm(main_query_states, main_key_states.transpose(1, 2))

        # retrieve relative position embeddings for each layer -> see paper for more details
        main_relative_pos_embeddings = self.get_main_relative_pos_embeddings(
            main_hidden_states, main_attn_weights, position_ids, main_relative_position_buckets
        )
        main_attn_weights = main_attn_weights + main_relative_pos_embeddings

        if attention_mask is not None:
            main_attn_weights = main_attn_weights + attention_mask

        main_attn_probs = softmax(
            main_attn_weights,
            dim=-1,
            onnx_trace=self.onnx_trace,
        ).type_as(main_attn_weights)

        main_attn_probs = F.dropout(main_attn_probs, p=self.attention_dropout, training=self.training)

        # project to attn_output
        main_attn_output = torch.bmm(main_attn_probs, main_value_states)
        main_attn_output = (
            main_attn_output.transpose(0, 1).contiguous().view(1, main_sequence_length, batch_size, hidden_size)
        )
        main_attn_output = self.out_proj(main_attn_output)

        # PREDICT-STREAM
        # [ngram, B*head, T, c]
        predict_query_states = torch.cat(predict_query_states_list, 0).view(
            self.ngram, -1, main_sequence_length, self.head_dim
        )
        # [ngram, B*head, 2*T, c]
        predict_key_states = torch.cat(
            [torch.cat([main_key_states, key], 1).unsqueeze(0) for key in predict_key_states_list], 0
        )

        # [ngram, T, B, C]
        predict_hidden_states = torch.cat(hidden_states_predict_list, 0).view(
            self.ngram, main_sequence_length, batch_size, hidden_size
        )

        # [ngram, B*head, 2*T, c]
        predict_value_states = torch.cat(
            [torch.cat([main_value_states, v_p], 1).unsqueeze(0) for v_p in predict_value_states_list], 0
        )
        # [ngram, B*head, T, 2*T]
        predict_attn_weights = torch.einsum("nbtc,nbsc->nbts", (predict_query_states, predict_key_states))

        # [ngram, B*head, T, S]
        # retrieve relative position embeddings for each layer -> see paper for more details
        predict_relative_pos_embeddings = self.get_predict_relative_pos_embeddings(
            predict_hidden_states, predict_attn_weights, position_ids, predict_relative_position_buckets
        )

        # [ngram, B*head, T, 2*T]
        predict_attn_weights = predict_attn_weights + predict_relative_pos_embeddings

        if extended_predict_attention_mask is not None:
            predict_attn_weights = predict_attn_weights + extended_predict_attention_mask

        predict_attn_probs = softmax(
            predict_attn_weights,
            dim=-1,
            onnx_trace=self.onnx_trace,
        ).type_as(predict_attn_weights)
        predict_attn_probs = F.dropout(predict_attn_probs, p=self.attention_dropout, training=self.training)

        # project to attention output
        # [ngram, B*head, T, c]
        predict_attn_output = torch.einsum("nbts,nbsc->nbtc", (predict_attn_probs, predict_value_states))
        # [ngram, T, B, C]
        predict_attn_output = (
            predict_attn_output.transpose(1, 2)
            .contiguous()
            .view(self.ngram, main_sequence_length, batch_size, hidden_size)
        )
        predict_attn_output = self.out_proj(predict_attn_output)

        # concat to single attn output
        # [1+ngram*T, B, C]
        attn_output = torch.cat([main_attn_output, predict_attn_output], 0).view(-1, batch_size, hidden_size)

        # reshape into better form for `config.output_attentions`
        main_attn_probs = main_attn_probs.view(batch_size, self.num_attn_heads, main_sequence_length, -1)
        predict_attn_probs = predict_attn_probs.view(
            self.ngram, batch_size, self.num_attn_heads, main_sequence_length, -1
        ).transpose(0, 1)

        attn_output = F.dropout(attn_output, p=self.dropout, training=self.training)
        return attn_output, main_attn_probs, predict_attn_probs

    def get_main_relative_pos_embeddings(
        self, hidden_states, attn_weights, position_ids, main_relative_position_buckets
    ):
        # input hidden_states [T,B,C], input attn_weights [T*head,T,S], input position_ids [B,T] or [1,1]

        if main_relative_position_buckets is None:
            batch_size, sequence_length = hidden_states.shape[:2]
            relative_positions = (
                torch.arange(1, attn_weights.shape[-1] + 1)
                .unsqueeze(0)
                .unsqueeze(0)
                .repeat(batch_size, sequence_length, 1)
                .to(position_ids.device)
            )
            relative_positions = relative_positions - position_ids.unsqueeze(0).repeat(
                batch_size, sequence_length, 1
            )  # [B, T, s]
            main_relative_position_buckets = compute_relative_buckets(
                self.num_buckets, self.relative_max_distance, relative_positions, False
            )

        hidden_states = hidden_states.transpose(0, 1)  # [B,T,C]
        rel_pos_embeddings = self.relative_pos_embeddings(hidden_states)  # [B,T,Buckets*head]
        rel_pos_embeddings = rel_pos_embeddings.view(
            rel_pos_embeddings.shape[:2] + (self.num_buckets, self.num_attn_heads)
        ).permute(
            0, 3, 1, 2
        )  # [B,T,Buckets,head]
        rel_pos_embeddings = rel_pos_embeddings.reshape(attn_weights.shape[:2] + (-1,))  # [B*head,T,Buckets]

        main_relative_position_buckets = (
            main_relative_position_buckets.repeat(1, self.num_attn_heads, 1)
            .view(-1, main_relative_position_buckets.shape[-1])
            .long()
        )  # [B*head*T, T]
        rel_pos_embeddings = rel_pos_embeddings.reshape(-1, rel_pos_embeddings.size(-1))  # [B*head*T,Buckets]

        main_relative_pos_embeddings = torch.gather(
            rel_pos_embeddings, dim=1, index=main_relative_position_buckets
        ).view(attn_weights.shape[:2] + (-1,))

        return main_relative_pos_embeddings

    def get_predict_relative_pos_embeddings(
        self, hidden_states, attn_weights, position_ids, predict_relative_position_buckets
    ):
        # input hidden_states [ngram, T,B,C], input attn_weights [ngram, B*head,T,S], input position_ids [B,T] or [1,1], input predict_relative_position_buckets [B,T, 2*T] or None

        sequence_length, batch_size = hidden_states.shape[1:3]

        if predict_relative_position_buckets is None:
            key_sequence_length = attn_weights.shape[-1]
            assert (
                position_ids[0][0] == key_sequence_length - 1
            ), "`position_ids` are incorrect. They should be of the format 1 2 3 4 5 ... (key_sequence_length - 1)"
            relative_positions = (
                torch.arange(0, key_sequence_length)
                .unsqueeze(0)
                .unsqueeze(0)
                .repeat(batch_size, sequence_length, 1)
                .to(position_ids.device)
            )

            relative_positions = relative_positions - position_ids.unsqueeze(0).repeat(batch_size, sequence_length, 1)
            predict_relative_position_buckets = compute_relative_buckets(
                self.num_buckets, self.relative_max_distance, relative_positions, False
            )

        hidden_states = hidden_states.transpose(1, 2)  # [ngram, B, T, C]
        rel_pos_embeddings = self.relative_pos_embeddings(hidden_states).view(
            hidden_states.shape[:-1] + (self.num_buckets, self.num_attn_heads)
        )  # [ngram, B, T, bucket, head]
        rel_pos_embeddings = rel_pos_embeddings.permute(0, 1, 4, 2, 3).reshape(
            self.ngram * batch_size * self.num_attn_heads, sequence_length, -1
        )  # [ngram*B*head, T, bucket]

        predict_relative_position_buckets = predict_relative_position_buckets.unsqueeze(0).repeat(
            self.ngram, 1, self.num_attn_heads, 1
        )  # [ngram, B, head*T, S]

        rel_pos_embeddings = rel_pos_embeddings.reshape(-1, rel_pos_embeddings.size(-1))
        predict_relative_position_buckets = predict_relative_position_buckets.view(
            -1, predict_relative_position_buckets.size(-1)
        ).long()  # [ngram*B*head*T, S]

        predict_relative_pos_embeddings = torch.gather(
            rel_pos_embeddings, dim=1, index=predict_relative_position_buckets
        ).view(
            self.ngram, batch_size * self.num_attn_heads, sequence_length, -1
        )  # [ngram, B*head, T, S]

        return predict_relative_pos_embeddings


class ProphetNetEncoderLayer(nn.Module):
    """
    Encoder block for Prophetnet
    """

    def __init__(self, config: ProphetNetConfig):
        super().__init__()
        # 1st residual block
        self.self_attn = ProphetNetAttention(config, config.num_encoder_attention_heads)
        self.self_attn_layer_norm = LayerNorm(config.hidden_size)

        # 2nd residual block
        self.feed_forward = ProphetNetFeedForward(config, config.encoder_ffn_dim)
        self.feed_forward_layer_norm = LayerNorm(config.hidden_size)

    def forward(self, hidden_states, attention_mask):
        # 1st residual block
        attention_output, attn_weights = self.self_attn(
            hidden_states=hidden_states,
            attention_mask=attention_mask,
        )
        hidden_states = self.self_attn_layer_norm(attention_output + hidden_states)

        # 2nd residual block
        feed_forward_output = self.feed_forward(hidden_states)
        hidden_states = self.feed_forward_layer_norm(feed_forward_output + hidden_states)
        return hidden_states, attn_weights


class ProphetNetDecoderLayer(nn.Module):
    """
    Decoder block for Prophetnet
    """

    def __init__(self, config: ProphetNetConfig):
        super().__init__()
        # 1st residual block
        self.self_attn = ProphetNetNgramSelfAttention(config)
        self.self_attn_layer_norm = LayerNorm(config.hidden_size)

        # 2nd residual block
        if config.add_cross_attention:
            self.cross_attn = ProphetNetAttention(config, config.num_decoder_attention_heads)
            self.cross_attn_layer_norm = LayerNorm(config.hidden_size)

        # 3rd residual block
        self.feed_forward = ProphetNetFeedForward(config, config.decoder_ffn_dim)
        self.feed_forward_layer_norm = LayerNorm(config.hidden_size)

    def forward(
        self,
        hidden_states,
        encoder_hidden_states=None,
        encoder_attn_mask=None,
        layer_state=None,
        attention_mask=None,
        extended_predict_attention_mask=None,
        main_relative_position_buckets=None,
        predict_relative_position_buckets=None,
        position_ids=None,
    ):
        layer_state = layer_state if layer_state is not None else {}

        # 1st residual block
        ngram_attention_output, self_attn_weights, self_attn_weights_ngram = self.self_attn(
            hidden_states=hidden_states,
            layer_state=layer_state,
            attention_mask=attention_mask,
            extended_predict_attention_mask=extended_predict_attention_mask,
            main_relative_position_buckets=main_relative_position_buckets,
            predict_relative_position_buckets=predict_relative_position_buckets,
            position_ids=position_ids,
        )
        hidden_states = self.self_attn_layer_norm(hidden_states + ngram_attention_output)

        cross_attn_weights = None
        if encoder_hidden_states is not None:
            # 2nd residual block
            attention_output, cross_attn_weights = self.cross_attn(
                hidden_states=hidden_states,
                key_value_states=encoder_hidden_states,
                attention_mask=encoder_attn_mask,
                layer_state=layer_state,  # mutates layer state
            )
            hidden_states = self.cross_attn_layer_norm(attention_output + hidden_states)

        # 3rd residual block
        feed_forward_output = self.feed_forward(hidden_states)
        hidden_states = self.feed_forward_layer_norm(feed_forward_output + hidden_states)

        return (
            hidden_states,
            self_attn_weights,
            self_attn_weights_ngram,
            cross_attn_weights,
            layer_state,
        )  # just self_attn weights for now, following t5, layer_state = cache for decoding


@add_start_docstrings(
    "The standalone encoder part of the ProphetNetModel.",
    PROPHETNET_START_DOCSTRING,
)
class ProphetNetEncoder(ProphetNetPreTrainedModel):
    r"""
    word_embeddings  (:obj:`torch.nn.Embeddings` of shape :obj:`(config.vocab_size, config.hidden_size)`, `optional`):
        The word embedding parameters. This can be used to initialize :class:`~transformers.ProphetNetEncoder` with
        pre-defined word embeddings instead of randomely initialized word embeddings.
    """

    def __init__(self, config: ProphetNetConfig, word_embeddings: nn.Embedding = None):
        super().__init__(config)

        self.word_embeddings = (
            word_embeddings
            if word_embeddings is not None
            else nn.Embedding(config.vocab_size, config.hidden_size, padding_idx=config.pad_token_id)
        )
        self.position_embeddings = ProphetNetPositionalEmbeddings(config)
        self.embeddings_layer_norm = LayerNorm(config.hidden_size)

        self.layers = nn.ModuleList([ProphetNetEncoderLayer(config) for _ in range(config.num_encoder_layers)])

        self.init_weights()

    def get_input_embeddings(self):
        return self.word_embeddings

    def set_input_embeddings(self, value):
        self.word_embeddings = value

    @add_start_docstrings_to_model_forward(PROPHETNET_STANDALONE_INPUTS_DOCSTRING)
    @replace_return_docstrings(output_type=BaseModelOutput, config_class=_CONFIG_FOR_DOC)
    def forward(
        self,
        input_ids=None,
        attention_mask=None,
        inputs_embeds=None,
        output_attentions=None,
        output_hidden_states=None,
        return_dict=None,
    ):
        r"""
        Returns:

        Example::

            >>> from transformers import ProphetNetTokenizer, ProphetNetEncoder
            >>> import torch

            >>> tokenizer = ProphetNetTokenizer.from_pretrained('microsoft/prophetnet-large-uncased')
            >>> model = ProphetNetEncoder.from_pretrained('patrickvonplaten/prophetnet-large-uncased-standalone')
            >>> inputs = tokenizer("Hello, my dog is cute", return_tensors="pt")
            >>> outputs = model(**inputs)

            >>> last_hidden_states = outputs.last_hidden_state
        """

        output_attentions = output_attentions if output_attentions is not None else self.config.output_attentions
        output_hidden_states = (
            output_hidden_states if output_hidden_states is not None else self.config.output_hidden_states
        )
        return_dict = return_dict if return_dict is not None else self.config.use_return_dict

        if input_ids is None and inputs_embeds is None:
            raise ValueError("Either input_ids or inputs_embeds has to be passed.")
        elif input_ids is not None and inputs_embeds is not None:
            raise ValueError("Make sure to only pass input_ids or inputs_embeds.")
        elif input_ids is not None and inputs_embeds is None:
            inputs_embeds = self.word_embeddings(input_ids)

        # prepare attention mask
        if attention_mask is not None:
            extended_attention_mask = (
                1.0 - attention_mask[:, None, :].repeat(self.config.num_encoder_attention_heads, 1, 1)
            ) * -10000.0
            extended_attention_mask = extended_attention_mask.to(inputs_embeds.dtype)
        else:
            extended_attention_mask = None

        position_embeddings, position_ids = self.position_embeddings(inputs_embeds.shape[:2], inputs_embeds.device)

        hidden_states = inputs_embeds + position_embeddings
        hidden_states = self.embeddings_layer_norm(hidden_states)
        hidden_states = F.dropout(hidden_states, p=self.config.dropout, training=self.training)
        hidden_states = hidden_states.transpose(0, 1)  # B x T x C -> T x B x C

        encoder_hidden_states = () if output_hidden_states else None
        all_attentions = () if output_attentions else None

        for encoder_layer in self.layers:
            if output_hidden_states:
                hidden_states = hidden_states.transpose(0, 1)
                encoder_hidden_states = encoder_hidden_states + (hidden_states,)
                hidden_states = hidden_states.transpose(0, 1)
            hidden_states, attn_probs = encoder_layer(hidden_states, attention_mask=extended_attention_mask)
            if output_attentions:
                all_attentions = all_attentions + (attn_probs,)

        hidden_states = hidden_states.transpose(0, 1)
        if output_hidden_states:
            encoder_hidden_states = encoder_hidden_states + (hidden_states,)

        if not return_dict:
            return tuple(v for v in [hidden_states, encoder_hidden_states, all_attentions] if v is not None)
        return BaseModelOutput(
            last_hidden_state=hidden_states, hidden_states=encoder_hidden_states, attentions=all_attentions
        )


@add_start_docstrings(
    "The standalone decoder part of the ProphetNetModel.",
    PROPHETNET_START_DOCSTRING,
)
class ProphetNetDecoder(ProphetNetPreTrainedModel):
    r"""
    word_embeddings  (:obj:`torch.nn.Embeddings` of shape :obj:`(config.vocab_size, config.hidden_size)`, `optional`):
        The word embedding parameters. This can be used to initialize :class:`~transformers.ProphetNetEncoder` with
        pre-defined word embeddings instead of randomely initialized word embeddings.
    """

    def __init__(self, config: ProphetNetConfig, word_embeddings: nn.Embedding = None):
        super().__init__(config)

        self.ngram = config.ngram
        self.num_buckets = config.num_buckets
        self.relative_max_distance = config.relative_max_distance
        self.dropout = config.dropout
        self.max_target_positions = config.max_position_embeddings

        self.word_embeddings = (
            word_embeddings
            if word_embeddings is not None
            else nn.Embedding(config.vocab_size, config.hidden_size, padding_idx=config.pad_token_id)
        )
        self.position_embeddings = ProphetNetPositionalEmbeddings(config)

        self.ngram_embeddings = nn.Embedding(self.ngram, config.hidden_size, None)
        self.layers = nn.ModuleList([ProphetNetDecoderLayer(config) for _ in range(config.num_decoder_layers)])
        self.embeddings_layer_norm = LayerNorm(config.hidden_size)

        self.init_weights()

    def get_input_embeddings(self):
        return self.word_embeddings

    def set_input_embeddings(self, value):
        self.word_embeddings = value

    @add_start_docstrings_to_model_forward(PROPHETNET_STANDALONE_INPUTS_DOCSTRING)
    @replace_return_docstrings(output_type=ProphetNetDecoderModelOutput, config_class=_CONFIG_FOR_DOC)
    def forward(
        self,
        input_ids=None,
        attention_mask=None,
        encoder_hidden_states=None,
        encoder_attention_mask=None,
        past_key_values=None,
        inputs_embeds=None,
        use_cache=None,
        output_attentions=None,
        output_hidden_states=None,
        return_dict=None,
    ):
        r"""
        encoder_hidden_states  (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, sequence_length, hidden_size)`, `optional`):
            Sequence of hidden-states at the output of the last layer of the encoder. Used in the cross-attention if
            the model is configured as a decoder.
        encoder_attention_mask (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, sequence_length)`, `optional`):
            Mask to avoid performing attention on the padding token indices of the encoder input. This mask is used in
            the cross-attention if the model is configured as a decoder. Mask values selected in ``[0, 1]``:
        past_key_values (:obj:`tuple(tuple(torch.FloatTensor))` of length :obj:`config.n_layers` with each tuple having 4 tensors of shape :obj:`(batch_size, num_heads, sequence_length - 1, embed_size_per_head)`):
            Contains precomputed key and value hidden-states of the attention blocks. Can be used to speed up decoding.

            If :obj:`past_key_values` are used, the user can optionally input only the last ``decoder_input_ids``
            (those that don't have their past key value states given to this model) of shape :obj:`(batch_size, 1)`
            instead of all ``decoder_input_ids`` of shape :obj:`(batch_size, sequence_length)`.
        use_cache (:obj:`bool`, `optional`):
            If set to :obj:`True`, :obj:`past_key_values` key value states are returned and can be used to speed up
            decoding (see :obj:`past_key_values`).

            - 1 for tokens that are **not masked**,
            - 0 for tokens that are **masked**.

        Returns:

        Example::

            >>> from transformers import ProphetNetTokenizer, ProphetNetDecoder
            >>> import torch

            >>> tokenizer = ProphetNetTokenizer.from_pretrained('microsoft/prophetnet-large-uncased')
            >>> model = ProphetNetDecoder.from_pretrained('microsoft/prophetnet-large-uncased', add_cross_attention=False)
            >>> assert model.config.is_decoder, f"{model.__class__} has to be configured as a decoder."
            >>> inputs = tokenizer("Hello, my dog is cute", return_tensors="pt")
            >>> outputs = model(**inputs)

            >>> last_hidden_states = outputs.last_hidden_state
        """
        use_cache = use_cache if use_cache is not None else self.config.use_cache
        output_attentions = output_attentions if output_attentions is not None else self.config.output_attentions
        output_hidden_states = (
            output_hidden_states if output_hidden_states is not None else self.config.output_hidden_states
        )
        return_dict = return_dict if return_dict is not None else self.config.use_return_dict

        if input_ids is None and inputs_embeds is None:
            raise ValueError("Either `decoder_input_ids` or `decoder_inputs_embeds` has to be passed.")
        elif input_ids is not None and inputs_embeds is not None:
            raise ValueError("Make sure to only pass `decoder_input_ids` or `decoder_inputs_embeds`.")
        elif input_ids is not None and inputs_embeds is None:
            inputs_embeds = self.word_embeddings(input_ids)

        batch_size, sequence_length = inputs_embeds.shape[:2]

        main_stream_pos_embed, position_ids = self.position_embeddings(
            (batch_size, sequence_length),
            device=inputs_embeds.device,
            past_key_values=past_key_values,
        )

        if past_key_values is not None:
            main_relative_position_buckets, predict_relative_position_buckets = None, None
        else:
            (
                main_relative_position_buckets,
                predict_relative_position_buckets,
            ) = self.compute_buffered_relative_buckets(position_ids)
        predicting_stream_pos_embed = self.position_embeddings._forward(position_ids + 1)

        # add position embeddings
        hidden_states = inputs_embeds + main_stream_pos_embed
        hidden_states = hidden_states.transpose(0, 1)

        ngram_embeddings = self.ngram_embeddings.weight

        # prepare attention mask
        if past_key_values is not None:
            assert (
                hidden_states.size(0) == 1
            ), "At the moment `use_cache` is only supported for `decoder_input_ids` of length 1"

            ngram_hidden_states = [
                (ngram_embeddings[ngram - 1] + predicting_stream_pos_embed).transpose(0, 1).repeat(1, batch_size, 1)
                for ngram in range(self.ngram)
            ]
            extended_attention_mask = None
            extended_predict_attention_mask = None
        else:
            ngram_hidden_states = [
                (ngram_embeddings[ngram - 1] + predicting_stream_pos_embed).transpose(0, 1)
                for ngram in range(self.ngram)
            ]
            extended_attention_mask = self.prepare_attention_mask(hidden_states, attention_mask)
            extended_predict_attention_mask = self.prepare_predict_attention_mask(hidden_states, attention_mask)

        # prepare encoder attention mask
        if encoder_attention_mask is not None:
            extended_encoder_attention_mask = (
                1.0 - encoder_attention_mask[:, None, :].repeat(self.config.num_decoder_attention_heads, 1, 1)
            ) * -10000.0
            extended_encoder_attention_mask = extended_encoder_attention_mask.to(inputs_embeds.dtype)
        else:
            extended_encoder_attention_mask = None

        hidden_states = torch.cat([hidden_states] + ngram_hidden_states, 0)

        if self.embeddings_layer_norm:
            hidden_states = self.embeddings_layer_norm(hidden_states)

        hidden_states = F.dropout(hidden_states, p=self.dropout, training=self.training)

        if encoder_hidden_states is not None:
            encoder_hidden_states = encoder_hidden_states.transpose(0, 1)

        # init attentions, hidden_states and cache with empty tuples
        all_main_stream_hidden_states = () if output_hidden_states else None
        all_ngram_stream_hidden_states = () if output_hidden_states and self.config.ngram > 0 else None

        all_main_stream_attns = () if output_attentions else None
        all_ngram_stream_attns = () if output_attentions else None
        all_cross_attns = () if output_attentions and self.config.add_cross_attention else None
        present_key_values = () if use_cache else None

        for idx, decoder_layer in enumerate(self.layers):
            if output_hidden_states:
                # grad cannot be kept because tensor is sliced
                all_main_stream_hidden_states += (hidden_states[:sequence_length].transpose(0, 1),)
                if self.config.ngram > 0:
                    all_ngram_stream_hidden_states += (hidden_states[sequence_length:].transpose(0, 1),)

            layer_state = past_key_values[idx] if past_key_values is not None else None
            (
                hidden_states,
                layer_self_attn,
                layer_self_predict_attn_output,
                layer_cross_attn,
                layer_past,
            ) = decoder_layer(
                hidden_states,
                encoder_hidden_states=encoder_hidden_states,
                encoder_attn_mask=extended_encoder_attention_mask,
                layer_state=layer_state,
                attention_mask=extended_attention_mask,
                extended_predict_attention_mask=extended_predict_attention_mask,
                main_relative_position_buckets=main_relative_position_buckets,
                predict_relative_position_buckets=predict_relative_position_buckets,
                position_ids=position_ids,
            )
            if use_cache:
                present_key_values += (layer_past,)

            if output_attentions:
                all_main_stream_attns += (layer_self_attn,)
                all_ngram_stream_attns += (layer_self_predict_attn_output,)

                if self.config.add_cross_attention:
                    all_cross_attns += (layer_cross_attn,)

        if output_hidden_states:
            all_main_stream_hidden_states += (hidden_states[:sequence_length].transpose(0, 1),)
            if self.config.ngram > 0:
                all_ngram_stream_hidden_states += (hidden_states[sequence_length:].transpose(0, 1),)

        # split last_hidden_state for return
        last_hidden_state = hidden_states[:sequence_length].transpose(0, 1)
        last_hidden_state_ngram = hidden_states[sequence_length:].transpose(0, 1) if self.config.ngram > 0 else None
        encoder_hidden_states = encoder_hidden_states.transpose(0, 1) if encoder_hidden_states is not None else None

        if not return_dict:
            return tuple(
                v
                for v in [
                    last_hidden_state,
                    last_hidden_state_ngram,
                    present_key_values,
                    all_main_stream_hidden_states,
                    all_ngram_stream_hidden_states,
                    all_main_stream_attns,
                    all_ngram_stream_attns,
                    all_cross_attns,
                ]
                if v is not None
            )
        return ProphetNetDecoderModelOutput(
            last_hidden_state=last_hidden_state,
            last_hidden_state_ngram=last_hidden_state_ngram,
            past_key_values=present_key_values,
            hidden_states=all_main_stream_hidden_states,
            hidden_states_ngram=all_ngram_stream_hidden_states,
            attentions=all_main_stream_attns,
            ngram_attentions=all_ngram_stream_attns,
            cross_attentions=all_cross_attns,
        )

    def compute_buffered_relative_buckets(self, position_ids):
        batch_size, sequence_length = position_ids.shape

        position_ids = torch.arange(1, self.max_target_positions).to(position_ids.device).repeat(1, 1)
        main_relative_buckets, predict_relative_buckets = compute_all_stream_relative_buckets(
            self.num_buckets, self.relative_max_distance, position_ids
        )

        # buffer relative buckets
        main_relative_buckets = main_relative_buckets[:, :sequence_length, :sequence_length].repeat(batch_size, 1, 1)
        predict_relative_buckets = torch.cat(
            [
                predict_relative_buckets[:, :sequence_length, :sequence_length],
                predict_relative_buckets[
                    :, :sequence_length, self.max_target_positions : self.max_target_positions + sequence_length
                ],
            ],
            2,
        ).repeat(batch_size, 1, 1)

        return main_relative_buckets, predict_relative_buckets

    def prepare_attention_mask(self, hidden_states, attention_mask):
        seq_length, batch_size = hidden_states.shape[:2]

        # get causal mask
        causal_mask = hidden_states.new(seq_length, seq_length).float().fill_(-float("inf"))
        causal_mask = torch.triu(causal_mask, 1)
        extended_causal_mask = causal_mask[:seq_length, :seq_length][None, :, :].expand(
            (batch_size,) + causal_mask.shape
        )

        # add usual attention mask
        if attention_mask is not None:
            extended_attention_mask = (1.0 - attention_mask[:, None, :]) * -10000.0
            extended_attention_mask = extended_causal_mask + extended_attention_mask
        else:
            extended_attention_mask = extended_causal_mask
        return extended_attention_mask.repeat(self.config.num_decoder_attention_heads, 1, 1).to(hidden_states.dtype)

    def prepare_predict_attention_mask(self, hidden_states, attention_mask):
        seq_length, batch_size = hidden_states.shape[:2]

        # get causal mask
        predict_causal_mask = ngram_attention_bias(
            self.max_target_positions, self.ngram, hidden_states.device, hidden_states.dtype
        )
        predict_causal_mask = torch.cat(
            [
                predict_causal_mask[:, :seq_length, :seq_length],
                predict_causal_mask[
                    :, :seq_length, self.max_target_positions : self.max_target_positions + seq_length
                ],
            ],
            dim=-1,
        )
        extended_predict_causal_mask = predict_causal_mask[:, None, :, :].expand(
            predict_causal_mask.shape[:1] + (batch_size,) + predict_causal_mask.shape[1:]
        )

        # add usual attention mask
        if attention_mask is not None:
            extended_attention_mask = (1.0 - attention_mask[None, :, None, :]) * -10000.0
            extended_attention_mask = extended_attention_mask.expand((self.ngram, batch_size, seq_length, seq_length))
            # predicted stream attention_mask should always be 0
            extended_attention_mask = torch.cat(
                [extended_attention_mask, torch.zeros_like(extended_attention_mask)], dim=-1
            )
            extended_predict_attention_mask = extended_predict_causal_mask + extended_attention_mask
        else:
            extended_predict_attention_mask = extended_predict_causal_mask
        return extended_predict_attention_mask.repeat(1, self.config.num_decoder_attention_heads, 1, 1).to(
            hidden_states.dtype
        )


@add_start_docstrings(
    "The bare ProphetNet Model outputting raw hidden-states without any specific head on top.",
    PROPHETNET_START_DOCSTRING,
)
class ProphetNetModel(ProphetNetPreTrainedModel):
    def __init__(self, config):
        super().__init__(config)
        self.word_embeddings = nn.Embedding(config.vocab_size, config.hidden_size, padding_idx=config.pad_token_id)

        encoder_config = copy.deepcopy(config)
        encoder_config.is_encoder_decoder = False
        encoder_config.use_cache = False
        self.encoder = ProphetNetEncoder(encoder_config, self.word_embeddings)

        decoder_config = copy.deepcopy(config)
        decoder_config.is_decoder = True
        decoder_config.is_encoder_decoder = False
        self.decoder = ProphetNetDecoder(decoder_config, self.word_embeddings)

        self.init_weights()

    def get_input_embeddings(self):
        return self.word_embeddings

    def set_input_embeddings(self, value):
        self.word_embeddings = value
        self.encoder.word_embeddings = self.word_embeddings
        self.decoder.word_embeddings = self.word_embeddings

    def get_encoder(self):
        return self.encoder

    def get_decoder(self):
        return self.decoder

    @add_start_docstrings_to_model_forward(PROPHETNET_INPUTS_DOCSTRING)
    @replace_return_docstrings(output_type=ProphetNetSeq2SeqModelOutput, config_class=_CONFIG_FOR_DOC)
    def forward(
        self,
        input_ids=None,
        attention_mask=None,
        decoder_input_ids=None,
        decoder_attention_mask=None,
        encoder_outputs: Optional[Tuple] = None,
        past_key_values=None,
        inputs_embeds=None,
        decoder_inputs_embeds=None,
        use_cache=None,
        output_attentions=None,
        output_hidden_states=None,
        return_dict=None,
    ):
        r"""
        Returns:

        Example::

            >>> from transformers import ProphetNetTokenizer, ProphetNetModel

            >>> tokenizer = ProphetNetTokenizer.from_pretrained('microsoft/prophetnet-large-uncased')
            >>> model = ProphetNetModel.from_pretrained('microsoft/prophetnet-large-uncased')

            >>> input_ids = tokenizer("Studies have been shown that owning a dog is good for you", return_tensors="pt").input_ids  # Batch size 1
            >>> decoder_input_ids = tokenizer("Studies show that", return_tensors="pt").input_ids  # Batch size 1
            >>> outputs = model(input_ids=input_ids, decoder_input_ids=decoder_input_ids)

            >>> last_hidden_states = outputs.last_hidden_state  # main stream hidden states
            >>> last_hidden_states_ngram = outputs.last_hidden_state_ngram  # predict hidden states
        """

        use_cache == use_cache if use_cache is not None else self.config.use_cache
        output_attentions = output_attentions if output_attentions is not None else self.config.output_attentions
        output_hidden_states = (
            output_hidden_states if output_hidden_states is not None else self.config.output_hidden_states
        )
        return_dict = return_dict if return_dict is not None else self.config.use_return_dict

        if encoder_outputs is None:
            encoder_outputs = self.encoder(
                input_ids=input_ids,
                attention_mask=attention_mask,
                inputs_embeds=inputs_embeds,
                output_attentions=output_attentions,
                output_hidden_states=output_hidden_states,
                return_dict=return_dict,
            )

        # decoder outputs consists of (dec_features, layer_state, dec_hidden, dec_attn)
        decoder_outputs = self.decoder(
            input_ids=decoder_input_ids,
            attention_mask=decoder_attention_mask,
            encoder_hidden_states=encoder_outputs[0],
            encoder_attention_mask=attention_mask,
            past_key_values=past_key_values,
            inputs_embeds=decoder_inputs_embeds,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            use_cache=use_cache,
            return_dict=return_dict,
        )

        if not return_dict:
            return decoder_outputs + encoder_outputs
        return ProphetNetSeq2SeqModelOutput(
            last_hidden_state=decoder_outputs.last_hidden_state,
            last_hidden_state_ngram=decoder_outputs.last_hidden_state_ngram,
            past_key_values=decoder_outputs.past_key_values,
            decoder_hidden_states=decoder_outputs.hidden_states,
            decoder_ngram_hidden_states=decoder_outputs.hidden_states_ngram,
            decoder_attentions=decoder_outputs.attentions,
            decoder_ngram_attentions=decoder_outputs.ngram_attentions,
            cross_attentions=decoder_outputs.cross_attentions,
            encoder_last_hidden_state=encoder_outputs.last_hidden_state,
            encoder_hidden_states=encoder_outputs.hidden_states,
            encoder_attentions=encoder_outputs.attentions,
        )


@add_start_docstrings(
    "The ProphetNet Model with a language modeling head. Can be used for sequence generation tasks.",
    PROPHETNET_START_DOCSTRING,
)
class ProphetNetForConditionalGeneration(ProphetNetPreTrainedModel):
    def __init__(self, config: ProphetNetConfig):
        super().__init__(config)
        self.prophetnet = ProphetNetModel(config)
        self.padding_idx = config.pad_token_id
        self.disable_ngram_loss = config.disable_ngram_loss

        self.lm_head = nn.Linear(config.hidden_size, config.vocab_size, bias=False)

        self.init_weights()

    def get_output_embeddings(self):
        return self.lm_head

    def set_output_embeddings(self, new_embeddings):
        self.lm_head = new_embeddings

    def get_input_embeddings(self):
        return self.prophetnet.word_embeddings

    @add_start_docstrings_to_model_forward(PROPHETNET_INPUTS_DOCSTRING)
    @replace_return_docstrings(output_type=ProphetNetSeq2SeqLMOutput, config_class=_CONFIG_FOR_DOC)
    def forward(
        self,
        input_ids=None,
        attention_mask=None,
        decoder_input_ids=None,
        decoder_attention_mask=None,
        encoder_outputs=None,
        past_key_values=None,
        inputs_embeds=None,
        decoder_inputs_embeds=None,
        labels=None,
        use_cache=None,
        output_attentions=None,
        output_hidden_states=None,
        return_dict=None,
    ):
        r"""
        labels (:obj:`torch.LongTensor` of shape :obj:`(batch_size,)`, `optional`):
            Labels for computing the sequence classification/regression loss. Indices should be in :obj:`[-100, 0, ...,
            config.vocab_size - 1]`. All labels set to ``-100`` are ignored (masked), the loss is only computed for
            labels in ``[0, ..., config.vocab_size]``

        Returns:

        Example::

            >>> from transformers import ProphetNetTokenizer, ProphetNetForConditionalGeneration

            >>> tokenizer = ProphetNetTokenizer.from_pretrained('microsoft/prophetnet-large-uncased')
            >>> model = ProphetNetForConditionalGeneration.from_pretrained('microsoft/prophetnet-large-uncased')

            >>> input_ids = tokenizer("Studies have been shown that owning a dog is good for you", return_tensors="pt").input_ids  # Batch size 1
            >>> decoder_input_ids = tokenizer("Studies show that", return_tensors="pt").input_ids  # Batch size 1
            >>> outputs = model(input_ids=input_ids, decoder_input_ids=decoder_input_ids)

            >>> logits_next_token = outputs.logits  # logits to predict next token as usual
            >>> logits_ngram_next_tokens = outputs.logits_ngram  # logits to predict 2nd, 3rd, ... next tokens
        """
        return_dict = return_dict if return_dict is not None else self.config.use_return_dict

        if labels is not None and decoder_input_ids is None and decoder_inputs_embeds is None:
            # get decoder inputs from shifting lm labels to the right
            decoder_input_ids = self._shift_right(labels)

        outputs = self.prophetnet(
            input_ids=input_ids,
            attention_mask=attention_mask,
            decoder_input_ids=decoder_input_ids,
            decoder_attention_mask=decoder_attention_mask,
            encoder_outputs=encoder_outputs,
            past_key_values=past_key_values,
            inputs_embeds=inputs_embeds,
            decoder_inputs_embeds=decoder_inputs_embeds,
            use_cache=use_cache,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            return_dict=return_dict,
        )
        batch_size, sequence_length = (
            decoder_input_ids.shape if decoder_input_ids is not None else decoder_inputs_embeds.shape[:2]
        )

        predicting_streams = outputs[1].view(batch_size, self.config.ngram, sequence_length, -1)
        predict_logits = self.lm_head(predicting_streams)

        logits = predict_logits[:, 0]
        logits_ngram = predict_logits[:, 1:] if self.config.ngram > 1 else None

        # To use .view in loss computation, make sure that logits is contiguous.
        if not logits.is_contiguous():
            logits = logits.contiguous()

        loss = None
        if labels is not None:
            loss = self._compute_loss(predict_logits, labels)

        if not return_dict:
            all_logits = tuple(v for v in [logits, logits_ngram] if v is not None)
            return (loss,) + all_logits + outputs[2:] if loss is not None else all_logits + outputs[2:]
        else:
            return ProphetNetSeq2SeqLMOutput(
                loss=loss,
                logits=logits,
                logits_ngram=logits_ngram,
                past_key_values=outputs.past_key_values,
                decoder_hidden_states=outputs.decoder_hidden_states,
                decoder_ngram_hidden_states=outputs.decoder_ngram_hidden_states,
                decoder_attentions=outputs.decoder_attentions,
                decoder_ngram_attentions=outputs.decoder_ngram_attentions,
                cross_attentions=outputs.cross_attentions,
                encoder_last_hidden_state=outputs.encoder_last_hidden_state,
                encoder_hidden_states=outputs.encoder_hidden_states,
                encoder_attentions=outputs.encoder_attentions,
            )

    def _compute_loss(self, logits, labels, ignore_index=-100):
        expend_targets = labels.new_zeros(self.config.ngram, labels.size(0), labels.size(1)).fill_(ignore_index)

        for i in range(self.config.ngram):
            if i > 0 and self.disable_ngram_loss:
                break
            expend_targets[i, :, :] = labels

        lprobs = F.log_softmax(
            logits.view(-1, logits.size(-1)),
            dim=-1,
            dtype=torch.float32,
        )

        loss = F.nll_loss(lprobs, expend_targets.view(-1), reduction="mean")

        if self.config.eps > 0.0:
            smooth_loss = -lprobs.sum(dim=-1, keepdim=True)
            non_masked_tokens = expend_targets.ne(ignore_index).view(-1)
            smooth_loss = smooth_loss[non_masked_tokens]
            smooth_loss = smooth_loss.mean()

            eps_i = self.config.eps / lprobs.size(-1)
            loss = (1.0 - self.config.eps) * loss + eps_i * smooth_loss

        return loss

    def prepare_inputs_for_generation(
        self, decoder_input_ids, past=None, attention_mask=None, use_cache=None, encoder_outputs=None, **kwargs
    ):
        assert encoder_outputs is not None, "`encoder_outputs` have to be passed for generation."

        if past:
            decoder_input_ids = decoder_input_ids[:, -1:]
        # first step, decoder_cached_states are empty
        return {
            "input_ids": None,  # encoder_outputs is defined. input_ids not needed
            "encoder_outputs": encoder_outputs,
            "past_key_values": past,
            "decoder_input_ids": decoder_input_ids,
            "attention_mask": attention_mask,
            "use_cache": use_cache,
        }

    def prepare_decoder_input_ids_from_labels(self, labels: torch.Tensor):
        return self._shift_right(labels)

    @staticmethod
    def _reorder_cache(past, beam_idx):
        # this function reorders the cache for beam search
        def _reorder_cache(cache_dict, beam_idx):
            for k, key_value_states in cache_dict.items():
                if key_value_states is not None:
                    cache_dict[k] = key_value_states.index_select(0, beam_idx)
            return cache_dict

        reordered_past = []
        for layer_past in past:
            # get the correct batch idx from decoder layer's batch dim for cross and self-attn
            layer_past_new = {
                attn_key: _reorder_cache(attn_cache, beam_idx) for attn_key, attn_cache in layer_past.items()
            }
            reordered_past.append(layer_past_new)
        return reordered_past

    def get_encoder(self):
        return self.prophetnet.encoder

    def get_decoder(self):
        return self.prophetnet.decoder


@add_start_docstrings(
    "The standalone decoder part of the ProphetNetModel with a lm head on top. The model can be used for causal language modeling.",
    PROPHETNET_START_DOCSTRING,
)
class ProphetNetForCausalLM(ProphetNetPreTrainedModel):
    def __init__(self, config):
        # set config for CLM
        config = copy.deepcopy(config)
        config.is_decoder = True
        config.is_encoder_decoder = False
        super().__init__(config)
        self.prophetnet = ProphetNetDecoderWrapper(config)

        self.padding_idx = config.pad_token_id
        self.disable_ngram_loss = config.disable_ngram_loss

        self.lm_head = nn.Linear(config.hidden_size, config.vocab_size, bias=False)

        self.init_weights()

    def get_input_embeddings(self):
        return self.prophetnet.decoder.word_embeddings

    def set_input_embeddings(self, value):
        self.prophetnet.decoder.word_embeddings = value

    def get_output_embeddings(self):
        return self.lm_head

    def set_output_embeddings(self, new_embeddings):
        self.lm_head = new_embeddings

    def set_decoder(self, decoder):
        self.prophetnet.decoder = decoder

    def get_decoder(self):
        return self.prophetnet.decoder

    @add_start_docstrings_to_model_forward(PROPHETNET_STANDALONE_INPUTS_DOCSTRING)
    @replace_return_docstrings(output_type=ProphetNetDecoderLMOutput, config_class=_CONFIG_FOR_DOC)
    def forward(
        self,
        input_ids=None,
        attention_mask=None,
        encoder_hidden_states=None,
        encoder_attention_mask=None,
        past_key_values=None,
        inputs_embeds=None,
        labels=None,
        use_cache=None,
        output_attentions=None,
        output_hidden_states=None,
        return_dict=None,
    ):
        r"""
        encoder_hidden_states (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, sequence_length, hidden_size)`, `optional`):
            Sequence of hidden-states at the output of the last layer of the encoder. Used in the cross-attention if
            the model is configured as a decoder.
        encoder_attention_mask (:obj:`torch.FloatTensor` of shape :obj:`(batch_size, sequence_length)`, `optional`):
            Mask to avoid performing attention on the padding token indices of the encoder input. This mask is used in
            the cross-attention if the model is configured as a decoder. Mask values selected in ``[0, 1]``:
        past_key_values (:obj:`tuple(tuple(torch.FloatTensor))` of length :obj:`config.n_layers` with each tuple having 4 tensors of shape :obj:`(batch_size, num_heads, sequence_length - 1, embed_size_per_head)`):
            Contains precomputed key and value hidden-states of the attention blocks. Can be used to speed up decoding.

            If :obj:`past_key_values` are used, the user can optionally input only the last ``decoder_input_ids``
            (those that don't have their past key value states given to this model) of shape :obj:`(batch_size, 1)`
            instead of all ``decoder_input_ids`` of shape :obj:`(batch_size, sequence_length)`.
        use_cache (:obj:`bool`, `optional`):
            If set to :obj:`True`, :obj:`past_key_values` key value states are returned and can be used to speed up
            decoding (see :obj:`past_key_values`).

            - 1 for tokens that are **not masked**,
            - 0 for tokens that are **masked**.

        labels (:obj:`torch.LongTensor` of shape :obj:`(batch_size, sequence_length)`, `optional`):
            Labels for computing the left-to-right language modeling loss (next word prediction). Indices should be in
            ``[-100, 0, ..., config.vocab_size]`` (see ``input_ids`` docstring) Tokens with indices set to ``-100`` are
            ignored (masked), the loss is only computed for the tokens with labels n ``[0, ..., config.vocab_size]``

        Returns:

        Example::

            >>> from transformers import ProphetNetTokenizer, ProphetNetForCausalLM
            >>> import torch

            >>> tokenizer = ProphetNetTokenizer.from_pretrained('microsoft/prophetnet-large-uncased')
            >>> model = ProphetNetForCausalLM.from_pretrained('microsoft/prophetnet-large-uncased')
            >>> assert model.config.is_decoder, f"{model.__class__} has to be configured as a decoder."
            >>> inputs = tokenizer("Hello, my dog is cute", return_tensors="pt")
            >>> outputs = model(**inputs)

            >>> logits = outputs.logits

            >>> # Model can also be used with EncoderDecoder framework
            >>> from transformers import BertTokenizer, EncoderDecoderModel, ProphetNetTokenizer
            >>> import torch

            >>> tokenizer_enc = BertTokenizer.from_pretrained('bert-large-uncased')
            >>> tokenizer_dec = ProphetNetTokenizer.from_pretrained('microsoft/prophetnet-large-uncased')
            >>> model = EncoderDecoderModel.from_encoder_decoder_pretrained("bert-large-uncased", "microsoft/prophetnet-large-uncased")

            >>> ARTICLE = (
            ... "the us state department said wednesday it had received no "
            ... "formal word from bolivia that it was expelling the us ambassador there "
            ... "but said the charges made against him are `` baseless ."
            ... )
            >>> input_ids = tokenizer_enc(ARTICLE, return_tensors="pt").input_ids
            >>> labels = tokenizer_dec("us rejects charges against its ambassador in bolivia", return_tensors="pt").input_ids
            >>> outputs = model(input_ids=input_ids, decoder_input_ids=labels[:, :-1], labels=labels[:, 1:])

            >>> loss = outputs.loss
        """
        return_dict = return_dict if return_dict is not None else self.config.use_return_dict

        # decoder outputs consists of (dec_features, layer_state, dec_hidden, dec_attn)
        outputs = self.prophetnet.decoder(
            input_ids=input_ids,
            attention_mask=attention_mask,
            encoder_hidden_states=encoder_hidden_states,
            encoder_attention_mask=encoder_attention_mask,
            past_key_values=past_key_values,
            inputs_embeds=inputs_embeds,
            use_cache=use_cache,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            return_dict=return_dict,
        )

        batch_size, sequence_length = input_ids.shape if input_ids is not None else inputs_embeds.shape[:2]

        predicting_streams = outputs[1].view(batch_size, self.config.ngram, sequence_length, -1)
        predict_logits = self.lm_head(predicting_streams)

        logits = predict_logits[:, 0]
        logits_ngram = predict_logits[:, 1:] if self.config.ngram > 1 else None

        loss = None
        if labels is not None:
            loss = self._compute_loss(predict_logits, labels)

        if not return_dict:
            all_logits = tuple(v for v in [logits, logits_ngram] if v is not None)
            return (loss,) + all_logits + outputs[2:] if loss is not None else all_logits + outputs[2:]
        else:
            return ProphetNetDecoderLMOutput(
                loss=loss,
                logits=logits,
                logits_ngram=logits_ngram,
                past_key_values=outputs.past_key_values,
                hidden_states=outputs.hidden_states,
                hidden_states_ngram=outputs.hidden_states_ngram,
                attentions=outputs.attentions,
                ngram_attentions=outputs.ngram_attentions,
                cross_attentions=outputs.cross_attentions,
            )

    def _compute_loss(self, logits, labels, ignore_index=-100):
        expend_targets = labels.new_zeros(self.config.ngram, labels.size(0), labels.size(1)).fill_(ignore_index)

        for i in range(self.config.ngram):
            if i > 0 and self.disable_ngram_loss:
                break
            expend_targets[i, :, :] = labels

        lprobs = F.log_softmax(
            logits.view(-1, logits.size(-1)),
            dim=-1,
            dtype=torch.float32,
        )

        loss = F.nll_loss(lprobs, expend_targets.view(-1), reduction="mean")

        if self.config.eps > 0.0:
            smooth_loss = -lprobs.sum(dim=-1, keepdim=True)
            non_masked_tokens = expend_targets.ne(ignore_index).view(-1)
            smooth_loss = smooth_loss[non_masked_tokens]
            smooth_loss = smooth_loss.mean()

            eps_i = self.config.eps / lprobs.size(-1)
            loss = (1.0 - self.config.eps) * loss + eps_i * smooth_loss

        return loss

    def prepare_inputs_for_generation(self, input_ids, past=None, attention_mask=None, use_cache=None, **kwargs):
        # if model is used as a decoder in encoder-decoder model, the decoder attention mask is created on the fly
        if attention_mask is None:
            attention_mask = input_ids.new_ones(input_ids.shape)

        if past:
            input_ids = input_ids[:, -1:]
        # first step, decoder_cached_states are empty
        return {
            "input_ids": input_ids,  # encoder_outputs is defined. input_ids not needed
            "attention_mask": attention_mask,
            "past_key_values": past,
            "use_cache": use_cache,
        }

    @staticmethod
    def _reorder_cache(past, beam_idx):
        # this function reorders the cache for beam search
        def _reorder_cache(cache_dict, beam_idx):
            for k, key_value_states in cache_dict.items():
                if key_value_states is not None:
                    cache_dict[k] = key_value_states.index_select(0, beam_idx)
            return cache_dict

        reordered_past = []
        for layer_past in past:
            # get the correct batch idx from decoder layer's batch dim for cross and self-attn
            layer_past_new = {
                attn_key: _reorder_cache(attn_cache, beam_idx) for attn_key, attn_cache in layer_past.items()
            }
            reordered_past.append(layer_past_new)
        return reordered_past


class ProphetNetDecoderWrapper(ProphetNetPreTrainedModel):
    """
    This is a wrapper class, so that :class:`~transformers.ProphetNetForCausalLM` can correctly be loaded from
    pretrained prophetnet classes.
    """

    def __init__(self, config):
        super().__init__(config)
        self.decoder = ProphetNetDecoder(config)

    def forward(self, *args, **kwargs):
        return self.decoder(*args, **kwargs)
