# coding=utf-8
# Copyright 2023 Google AI and The HuggingFace Team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""PyTorch OWLv2 model."""

from dataclasses import dataclass
from functools import lru_cache
from typing import Any, Optional, Union

import torch
from torch import Tensor, nn

from ...activations import ACT2FN
from ...modeling_attn_mask_utils import _create_4d_causal_attention_mask, _prepare_4d_attention_mask
from ...modeling_layers import GradientCheckpointingLayer
from ...modeling_outputs import BaseModelOutput, BaseModelOutputWithPooling
from ...modeling_utils import PreTrainedModel
from ...utils import (
    ModelOutput,
    auto_docstring,
    filter_out_non_signature_kwargs,
    is_vision_available,
    logging,
    torch_int,
)
from .configuration_owlv2 import Owlv2Config, Owlv2TextConfig, Owlv2VisionConfig


if is_vision_available():
    from transformers.image_transforms import center_to_corners_format


logger = logging.get_logger(__name__)


# See all Owlv2 models at https://huggingface.co/models?filter=owlv2


# Copied from transformers.models.clip.modeling_clip.contrastive_loss with clip->owlv2
def contrastive_loss(logits: torch.Tensor) -> torch.Tensor:
    return nn.functional.cross_entropy(logits, torch.arange(len(logits), device=logits.device))


# Copied from transformers.models.clip.modeling_clip.clip_loss with clip->owlv2
def owlv2_loss(similarity: torch.Tensor) -> torch.Tensor:
    caption_loss = contrastive_loss(similarity)
    image_loss = contrastive_loss(similarity.t())
    return (caption_loss + image_loss) / 2.0


@dataclass
@auto_docstring
class Owlv2Output(ModelOutput):
    r"""
    loss (`torch.FloatTensor` of shape `(1,)`, *optional*, returned when `return_loss` is `True`):
        Contrastive loss for image-text similarity.
    logits_per_image (`torch.FloatTensor` of shape `(image_batch_size, text_batch_size)`):
        The scaled dot product scores between `image_embeds` and `text_embeds`. This represents the image-text
        similarity scores.
    logits_per_text (`torch.FloatTensor` of shape `(text_batch_size, image_batch_size)`):
        The scaled dot product scores between `text_embeds` and `image_embeds`. This represents the text-image
        similarity scores.
    text_embeds (`torch.FloatTensor` of shape `(batch_size * num_max_text_queries, output_dim`):
        The text embeddings obtained by applying the projection layer to the pooled output of [`Owlv2TextModel`].
    image_embeds (`torch.FloatTensor` of shape `(batch_size, output_dim`):
        The image embeddings obtained by applying the projection layer to the pooled output of
        [`Owlv2VisionModel`].
    text_model_output (tuple[`BaseModelOutputWithPooling`]):
        The output of the [`Owlv2TextModel`].
    vision_model_output (`BaseModelOutputWithPooling`):
        The output of the [`Owlv2VisionModel`].
    """

    loss: Optional[torch.FloatTensor] = None
    logits_per_image: Optional[torch.FloatTensor] = None
    logits_per_text: Optional[torch.FloatTensor] = None
    text_embeds: Optional[torch.FloatTensor] = None
    image_embeds: Optional[torch.FloatTensor] = None
    text_model_output: BaseModelOutputWithPooling = None
    vision_model_output: BaseModelOutputWithPooling = None

    def to_tuple(self) -> tuple[Any]:
        return tuple(
            self[k] if k not in ["text_model_output", "vision_model_output"] else getattr(self, k).to_tuple()
            for k in self.keys()
        )


# Copied from transformers.loss.loss_for_object_detection._upcast
def _upcast(t: Tensor) -> Tensor:
    # Protects from numerical overflows in multiplications by upcasting to the equivalent higher type
    if t.is_floating_point():
        return t if t.dtype in (torch.float32, torch.float64) else t.float()
    else:
        return t if t.dtype in (torch.int32, torch.int64) else t.int()


# Copied from transformers.loss.loss_for_object_detection.box_area
def box_area(boxes: Tensor) -> Tensor:
    """
    Computes the area of a set of bounding boxes, which are specified by its (x1, y1, x2, y2) coordinates.

    Args:
        boxes (`torch.FloatTensor` of shape `(number_of_boxes, 4)`):
            Boxes for which the area will be computed. They are expected to be in (x1, y1, x2, y2) format with `0 <= x1
            < x2` and `0 <= y1 < y2`.

    Returns:
        `torch.FloatTensor`: a tensor containing the area for each box.
    """
    boxes = _upcast(boxes)
    return (boxes[:, 2] - boxes[:, 0]) * (boxes[:, 3] - boxes[:, 1])


# Copied from transformers.loss.loss_for_object_detection.box_iou
def box_iou(boxes1, boxes2):
    area1 = box_area(boxes1)
    area2 = box_area(boxes2)

    left_top = torch.max(boxes1[:, None, :2], boxes2[:, :2])  # [N,M,2]
    right_bottom = torch.min(boxes1[:, None, 2:], boxes2[:, 2:])  # [N,M,2]

    width_height = (right_bottom - left_top).clamp(min=0)  # [N,M,2]
    inter = width_height[:, :, 0] * width_height[:, :, 1]  # [N,M]

    union = area1[:, None] + area2 - inter

    iou = inter / union
    return iou, union


# Copied from transformers.loss.loss_for_object_detection.generalized_box_iou
def generalized_box_iou(boxes1, boxes2):
    """
    Generalized IoU from https://giou.stanford.edu/. The boxes should be in [x0, y0, x1, y1] (corner) format.

    Returns:
        `torch.FloatTensor`: a [N, M] pairwise matrix, where N = len(boxes1) and M = len(boxes2)
    """
    # degenerate boxes gives inf / nan results
    # so do an early check
    if not (boxes1[:, 2:] >= boxes1[:, :2]).all():
        raise ValueError(f"boxes1 must be in [x0, y0, x1, y1] (corner) format, but got {boxes1}")
    if not (boxes2[:, 2:] >= boxes2[:, :2]).all():
        raise ValueError(f"boxes2 must be in [x0, y0, x1, y1] (corner) format, but got {boxes2}")
    iou, union = box_iou(boxes1, boxes2)

    top_left = torch.min(boxes1[:, None, :2], boxes2[:, :2])
    bottom_right = torch.max(boxes1[:, None, 2:], boxes2[:, 2:])

    width_height = (bottom_right - top_left).clamp(min=0)  # [N,M,2]
    area = width_height[:, :, 0] * width_height[:, :, 1]

    return iou - (area - union) / area


@dataclass
@auto_docstring(
    custom_intro="""
    Output type of [`Owlv2ForObjectDetection`].
    """
)
class Owlv2ObjectDetectionOutput(ModelOutput):
    r"""
    loss (`torch.FloatTensor` of shape `(1,)`, *optional*, returned when `labels` are provided)):
        Total loss as a linear combination of a negative log-likehood (cross-entropy) for class prediction and a
        bounding box loss. The latter is defined as a linear combination of the L1 loss and the generalized
        scale-invariant IoU loss.
    loss_dict (`Dict`, *optional*):
        A dictionary containing the individual losses. Useful for logging.
    logits (`torch.FloatTensor` of shape `(batch_size, num_patches, num_queries)`):
        Classification logits (including no-object) for all queries.
    objectness_logits (`torch.FloatTensor` of shape `(batch_size, num_patches, 1)`):
        The objectness logits of all image patches. OWL-ViT represents images as a set of image patches where the
        total number of patches is (image_size / patch_size)**2.
    pred_boxes (`torch.FloatTensor` of shape `(batch_size, num_patches, 4)`):
        Normalized boxes coordinates for all queries, represented as (center_x, center_y, width, height). These
        values are normalized in [0, 1], relative to the size of each individual image in the batch (disregarding
        possible padding). You can use [`~Owlv2ImageProcessor.post_process_object_detection`] to retrieve the
        unnormalized bounding boxes.
    text_embeds (`torch.FloatTensor` of shape `(batch_size, num_max_text_queries, output_dim`):
        The text embeddings obtained by applying the projection layer to the pooled output of [`Owlv2TextModel`].
    image_embeds (`torch.FloatTensor` of shape `(batch_size, patch_size, patch_size, output_dim`):
        Pooled output of [`Owlv2VisionModel`]. OWLv2 represents images as a set of image patches and computes image
        embeddings for each patch.
    class_embeds (`torch.FloatTensor` of shape `(batch_size, num_patches, hidden_size)`):
        Class embeddings of all image patches. OWLv2 represents images as a set of image patches where the total
        number of patches is (image_size / patch_size)**2.
    text_model_output (tuple[`BaseModelOutputWithPooling`]):
        The output of the [`Owlv2TextModel`].
    vision_model_output (`BaseModelOutputWithPooling`):
        The output of the [`Owlv2VisionModel`].
    """

    loss: Optional[torch.FloatTensor] = None
    loss_dict: Optional[dict] = None
    logits: Optional[torch.FloatTensor] = None
    objectness_logits: Optional[torch.FloatTensor] = None
    pred_boxes: Optional[torch.FloatTensor] = None
    text_embeds: Optional[torch.FloatTensor] = None
    image_embeds: Optional[torch.FloatTensor] = None
    class_embeds: Optional[torch.FloatTensor] = None
    text_model_output: BaseModelOutputWithPooling = None
    vision_model_output: BaseModelOutputWithPooling = None

    def to_tuple(self) -> tuple[Any]:
        return tuple(
            self[k] if k not in ["text_model_output", "vision_model_output"] else getattr(self, k).to_tuple()
            for k in self.keys()
        )


@dataclass
@auto_docstring(
    custom_intro="""
    Output type of [`Owlv2ForObjectDetection.image_guided_detection`].
    """
)
# Copied from transformers.models.owlvit.modeling_owlvit.OwlViTImageGuidedObjectDetectionOutput with OwlViT->Owlv2,OWL-ViT->OWLv2
class Owlv2ImageGuidedObjectDetectionOutput(ModelOutput):
    r"""
    logits (`torch.FloatTensor` of shape `(batch_size, num_patches, num_queries)`):
        Classification logits (including no-object) for all queries.
    image_embeds (`torch.FloatTensor` of shape `(batch_size, patch_size, patch_size, output_dim`):
        Pooled output of [`Owlv2VisionModel`]. OWLv2 represents images as a set of image patches and computes
        image embeddings for each patch.
    query_image_embeds (`torch.FloatTensor` of shape `(batch_size, patch_size, patch_size, output_dim`):
        Pooled output of [`Owlv2VisionModel`]. OWLv2 represents images as a set of image patches and computes
        image embeddings for each patch.
    target_pred_boxes (`torch.FloatTensor` of shape `(batch_size, num_patches, 4)`):
        Normalized boxes coordinates for all queries, represented as (center_x, center_y, width, height). These
        values are normalized in [0, 1], relative to the size of each individual target image in the batch
        (disregarding possible padding). You can use [`~Owlv2ImageProcessor.post_process_object_detection`] to
        retrieve the unnormalized bounding boxes.
    query_pred_boxes (`torch.FloatTensor` of shape `(batch_size, num_patches, 4)`):
        Normalized boxes coordinates for all queries, represented as (center_x, center_y, width, height). These
        values are normalized in [0, 1], relative to the size of each individual query image in the batch
        (disregarding possible padding). You can use [`~Owlv2ImageProcessor.post_process_object_detection`] to
        retrieve the unnormalized bounding boxes.
    class_embeds (`torch.FloatTensor` of shape `(batch_size, num_patches, hidden_size)`):
        Class embeddings of all image patches. OWLv2 represents images as a set of image patches where the total
        number of patches is (image_size / patch_size)**2.
    text_model_output (tuple[`BaseModelOutputWithPooling`]):
        The output of the [`Owlv2TextModel`].
    vision_model_output (`BaseModelOutputWithPooling`):
        The output of the [`Owlv2VisionModel`].
    """

    logits: Optional[torch.FloatTensor] = None
    image_embeds: Optional[torch.FloatTensor] = None
    query_image_embeds: Optional[torch.FloatTensor] = None
    target_pred_boxes: Optional[torch.FloatTensor] = None
    query_pred_boxes: Optional[torch.FloatTensor] = None
    class_embeds: Optional[torch.FloatTensor] = None
    text_model_output: BaseModelOutputWithPooling = None
    vision_model_output: BaseModelOutputWithPooling = None

    def to_tuple(self) -> tuple[Any]:
        return tuple(
            self[k] if k not in ["text_model_output", "vision_model_output"] else getattr(self, k).to_tuple()
            for k in self.keys()
        )


# Copied from transformers.models.owlvit.modeling_owlvit.OwlViTVisionEmbeddings with OwlViT->Owlv2
class Owlv2VisionEmbeddings(nn.Module):
    def __init__(self, config: Owlv2VisionConfig):
        super().__init__()
        self.patch_size = config.patch_size
        self.config = config
        self.embed_dim = config.hidden_size
        self.class_embedding = nn.Parameter(torch.randn(config.hidden_size))

        self.patch_embedding = nn.Conv2d(
            in_channels=config.num_channels,
            out_channels=self.embed_dim,
            kernel_size=config.patch_size,
            stride=config.patch_size,
            bias=False,
        )

        self.num_patches = (config.image_size // config.patch_size) ** 2
        self.num_positions = self.num_patches + 1
        self.position_embedding = nn.Embedding(self.num_positions, self.embed_dim)
        self.register_buffer("position_ids", torch.arange(self.num_positions).expand((1, -1)), persistent=False)

    # Copied from transformers.models.clip.modeling_clip.CLIPVisionEmbeddings.interpolate_pos_encoding
    def interpolate_pos_encoding(self, embeddings: torch.Tensor, height: int, width: int) -> torch.Tensor:
        """
        This method allows to interpolate the pre-trained position encodings, to be able to use the model on higher resolution
        images. This method is also adapted to support torch.jit tracing.

        Adapted from:
        - https://github.com/facebookresearch/dino/blob/de9ee3df6cf39fac952ab558447af1fa1365362a/vision_transformer.py#L174-L194, and
        - https://github.com/facebookresearch/dinov2/blob/e1277af2ba9496fbadf7aec6eba56e8d882d1e35/dinov2/models/vision_transformer.py#L179-L211
        """

        num_patches = embeddings.shape[1] - 1
        position_embedding = self.position_embedding.weight.unsqueeze(0)
        num_positions = position_embedding.shape[1] - 1

        # always interpolate when tracing to ensure the exported model works for dynamic input shapes
        if not torch.jit.is_tracing() and num_patches == num_positions and height == width:
            return self.position_embedding(self.position_ids)

        class_pos_embed = position_embedding[:, :1]
        patch_pos_embed = position_embedding[:, 1:]

        dim = embeddings.shape[-1]

        new_height = height // self.patch_size
        new_width = width // self.patch_size

        sqrt_num_positions = torch_int(num_positions**0.5)
        patch_pos_embed = patch_pos_embed.reshape(1, sqrt_num_positions, sqrt_num_positions, dim)
        patch_pos_embed = patch_pos_embed.permute(0, 3, 1, 2)

        patch_pos_embed = nn.functional.interpolate(
            patch_pos_embed,
            size=(new_height, new_width),
            mode="bicubic",
            align_corners=False,
        )

        patch_pos_embed = patch_pos_embed.permute(0, 2, 3, 1).view(1, -1, dim)

        return torch.cat((class_pos_embed, patch_pos_embed), dim=1)

    def forward(self, pixel_values: torch.FloatTensor, interpolate_pos_encoding: bool = False) -> torch.Tensor:
        batch_size, _, height, width = pixel_values.shape
        patch_embeds = self.patch_embedding(pixel_values)  # shape = [batch_size, num_channels, height, width]
        patch_embeds = patch_embeds.flatten(2).transpose(1, 2)

        class_embeds = self.class_embedding.expand(batch_size, 1, -1)
        embeddings = torch.cat([class_embeds, patch_embeds], dim=1)
        if interpolate_pos_encoding:
            embeddings = embeddings + self.interpolate_pos_encoding(embeddings, height, width)
        else:
            embeddings = embeddings + self.position_embedding(self.position_ids)
        return embeddings


# Copied from transformers.models.owlvit.modeling_owlvit.OwlViTTextEmbeddings with OwlViT->Owlv2
class Owlv2TextEmbeddings(nn.Module):
    def __init__(self, config: Owlv2TextConfig):
        super().__init__()
        self.token_embedding = nn.Embedding(config.vocab_size, config.hidden_size)
        self.position_embedding = nn.Embedding(config.max_position_embeddings, config.hidden_size)

        # position_ids (1, len position emb) is contiguous in memory and exported when serialized
        self.register_buffer(
            "position_ids", torch.arange(config.max_position_embeddings).expand((1, -1)), persistent=False
        )

    def forward(
        self,
        input_ids: Optional[torch.LongTensor] = None,
        position_ids: Optional[torch.LongTensor] = None,
        inputs_embeds: Optional[torch.FloatTensor] = None,
    ) -> torch.Tensor:
        seq_length = input_ids.shape[-1] if input_ids is not None else inputs_embeds.shape[-2]

        if position_ids is None:
            position_ids = self.position_ids[:, :seq_length]

        if inputs_embeds is None:
            inputs_embeds = self.token_embedding(input_ids)

        position_embeddings = self.position_embedding(position_ids)
        embeddings = inputs_embeds + position_embeddings

        return embeddings


# Copied from transformers.models.owlvit.modeling_owlvit.OwlViTAttention with OwlViT->Owlv2
class Owlv2Attention(nn.Module):
    """Multi-headed attention from 'Attention Is All You Need' paper"""

    def __init__(self, config):
        super().__init__()
        self.config = config
        self.embed_dim = config.hidden_size
        self.num_heads = config.num_attention_heads
        self.head_dim = self.embed_dim // self.num_heads
        if self.head_dim * self.num_heads != self.embed_dim:
            raise ValueError(
                f"embed_dim must be divisible by num_heads (got `embed_dim`: {self.embed_dim} and `num_heads`:"
                f" {self.num_heads})."
            )
        self.scale = self.head_dim**-0.5
        self.dropout = config.attention_dropout

        self.k_proj = nn.Linear(self.embed_dim, self.embed_dim)
        self.v_proj = nn.Linear(self.embed_dim, self.embed_dim)
        self.q_proj = nn.Linear(self.embed_dim, self.embed_dim)
        self.out_proj = nn.Linear(self.embed_dim, self.embed_dim)

    def _shape(self, tensor: torch.Tensor, seq_len: int, bsz: int):
        return tensor.view(bsz, seq_len, self.num_heads, self.head_dim).transpose(1, 2).contiguous()

    def forward(
        self,
        hidden_states: torch.Tensor,
        attention_mask: Optional[torch.Tensor] = None,
        causal_attention_mask: Optional[torch.Tensor] = None,
        output_attentions: Optional[bool] = False,
    ) -> tuple[torch.Tensor, Optional[torch.Tensor], Optional[tuple[torch.Tensor]]]:
        """Input shape: Batch x Time x Channel"""

        bsz, tgt_len, embed_dim = hidden_states.size()

        # get query proj
        query_states = self.q_proj(hidden_states) * self.scale
        key_states = self._shape(self.k_proj(hidden_states), -1, bsz)
        value_states = self._shape(self.v_proj(hidden_states), -1, bsz)

        proj_shape = (bsz * self.num_heads, -1, self.head_dim)
        query_states = self._shape(query_states, tgt_len, bsz).view(*proj_shape)
        key_states = key_states.view(*proj_shape)
        value_states = value_states.view(*proj_shape)

        src_len = key_states.size(1)
        attn_weights = torch.bmm(query_states, key_states.transpose(1, 2))

        if attn_weights.size() != (bsz * self.num_heads, tgt_len, src_len):
            raise ValueError(
                f"Attention weights should be of size {(bsz * self.num_heads, tgt_len, src_len)}, but is"
                f" {attn_weights.size()}"
            )

        # apply the causal_attention_mask first
        if causal_attention_mask is not None:
            if causal_attention_mask.size() != (bsz, 1, tgt_len, src_len):
                raise ValueError(
                    f"Attention mask should be of size {(bsz, 1, tgt_len, src_len)}, but is"
                    f" {causal_attention_mask.size()}"
                )
            attn_weights = attn_weights.view(bsz, self.num_heads, tgt_len, src_len) + causal_attention_mask
            attn_weights = attn_weights.view(bsz * self.num_heads, tgt_len, src_len)

        if attention_mask is not None:
            if attention_mask.size() != (bsz, 1, tgt_len, src_len):
                raise ValueError(
                    f"Attention mask should be of size {(bsz, 1, tgt_len, src_len)}, but is {attention_mask.size()}"
                )
            attn_weights = attn_weights.view(bsz, self.num_heads, tgt_len, src_len) + attention_mask
            attn_weights = attn_weights.view(bsz * self.num_heads, tgt_len, src_len)

        attn_weights = nn.functional.softmax(attn_weights, dim=-1)

        if output_attentions:
            # this operation is a bit awkward, but it's required to
            # make sure that attn_weights keeps its gradient.
            # In order to do so, attn_weights have to reshaped
            # twice and have to be reused in the following
            attn_weights_reshaped = attn_weights.view(bsz, self.num_heads, tgt_len, src_len)
            attn_weights = attn_weights_reshaped.view(bsz * self.num_heads, tgt_len, src_len)
        else:
            attn_weights_reshaped = None

        attn_probs = nn.functional.dropout(attn_weights, p=self.dropout, training=self.training)

        # For int8 compatibility, sometimes the `attn_probs` are in `fp32`
        attn_probs = attn_probs.to(value_states.dtype)

        attn_output = torch.bmm(attn_probs, value_states)

        if attn_output.size() != (bsz * self.num_heads, tgt_len, self.head_dim):
            raise ValueError(
                f"`attn_output` should be of size {(bsz, self.num_heads, tgt_len, self.head_dim)}, but is"
                f" {attn_output.size()}"
            )

        attn_output = attn_output.view(bsz, self.num_heads, tgt_len, self.head_dim)
        attn_output = attn_output.transpose(1, 2)
        attn_output = attn_output.reshape(bsz, tgt_len, embed_dim)

        attn_output = self.out_proj(attn_output)

        return attn_output, attn_weights_reshaped


# Copied from transformers.models.clip.modeling_clip.CLIPMLP with CLIP->Owlv2
class Owlv2MLP(nn.Module):
    def __init__(self, config):
        super().__init__()
        self.config = config
        self.activation_fn = ACT2FN[config.hidden_act]
        self.fc1 = nn.Linear(config.hidden_size, config.intermediate_size)
        self.fc2 = nn.Linear(config.intermediate_size, config.hidden_size)

    def forward(self, hidden_states: torch.Tensor) -> torch.Tensor:
        hidden_states = self.fc1(hidden_states)
        hidden_states = self.activation_fn(hidden_states)
        hidden_states = self.fc2(hidden_states)
        return hidden_states


# Copied from transformers.models.altclip.modeling_altclip.AltCLIPEncoderLayer with AltCLIP->Owlv2
class Owlv2EncoderLayer(GradientCheckpointingLayer):
    def __init__(self, config: Owlv2Config):
        super().__init__()
        self.embed_dim = config.hidden_size
        self.self_attn = Owlv2Attention(config)
        self.layer_norm1 = nn.LayerNorm(self.embed_dim, eps=config.layer_norm_eps)
        self.mlp = Owlv2MLP(config)
        self.layer_norm2 = nn.LayerNorm(self.embed_dim, eps=config.layer_norm_eps)

    def forward(
        self,
        hidden_states: torch.Tensor,
        attention_mask: torch.Tensor,
        causal_attention_mask: torch.Tensor,
        output_attentions: Optional[bool] = False,
    ) -> tuple[torch.FloatTensor]:
        """
        Args:
            hidden_states (`torch.FloatTensor`): input to the layer of shape `(batch, seq_len, embed_dim)`
            attention_mask (`torch.FloatTensor`): attention mask of size
                `(batch, 1, tgt_len, src_len)` where padding elements are indicated by very large negative values.
                `(config.encoder_attention_heads,)`.
            output_attentions (`bool`, *optional*):
                Whether or not to return the attentions tensors of all attention layers. See `attentions` under
                returned tensors for more detail.
        """
        residual = hidden_states

        hidden_states = self.layer_norm1(hidden_states)
        hidden_states, attn_weights = self.self_attn(
            hidden_states=hidden_states,
            attention_mask=attention_mask,
            causal_attention_mask=causal_attention_mask,
            output_attentions=output_attentions,
        )
        hidden_states = residual + hidden_states

        residual = hidden_states
        hidden_states = self.layer_norm2(hidden_states)
        hidden_states = self.mlp(hidden_states)
        hidden_states = residual + hidden_states

        outputs = (hidden_states,)

        if output_attentions:
            outputs += (attn_weights,)

        return outputs


@auto_docstring
# Copied from transformers.models.owlvit.modeling_owlvit.OwlViTPreTrainedModel with OwlViT->Owlv2,owlvit->owlv2
class Owlv2PreTrainedModel(PreTrainedModel):
    config: Owlv2Config
    base_model_prefix = "owlv2"
    input_modalities = ["image", "text"]
    supports_gradient_checkpointing = True
    _no_split_modules = ["Owlv2EncoderLayer"]

    def _init_weights(self, module: nn.Module):
        """Initialize the weights"""
        factor = self.config.initializer_factor
        if isinstance(module, Owlv2TextEmbeddings):
            module.token_embedding.weight.data.normal_(mean=0.0, std=factor * 0.02)
            module.position_embedding.weight.data.normal_(mean=0.0, std=factor * 0.02)
        elif isinstance(module, Owlv2VisionEmbeddings):
            nn.init.normal_(module.class_embedding, mean=0.0, std=module.embed_dim**-0.5 * factor)
            nn.init.normal_(module.patch_embedding.weight, std=module.config.initializer_range * factor)
            nn.init.normal_(module.position_embedding.weight, std=module.config.initializer_range * factor)
        elif isinstance(module, Owlv2Attention):
            in_proj_std = (module.embed_dim**-0.5) * ((2 * module.config.num_hidden_layers) ** -0.5) * factor
            out_proj_std = (module.embed_dim**-0.5) * factor
            nn.init.normal_(module.q_proj.weight, std=in_proj_std)
            nn.init.normal_(module.k_proj.weight, std=in_proj_std)
            nn.init.normal_(module.v_proj.weight, std=in_proj_std)
            nn.init.normal_(module.out_proj.weight, std=out_proj_std)
        elif isinstance(module, Owlv2MLP):
            in_proj_std = (module.config.hidden_size**-0.5) * ((2 * module.config.num_hidden_layers) ** -0.5) * factor
            fc_std = (2 * module.config.hidden_size) ** -0.5 * factor
            nn.init.normal_(module.fc1.weight, std=fc_std)
            nn.init.normal_(module.fc2.weight, std=in_proj_std)
        elif isinstance(module, Owlv2Model):
            nn.init.normal_(
                module.text_projection.weight,
                std=module.text_embed_dim**-0.5 * factor,
            )
            nn.init.normal_(
                module.visual_projection.weight,
                std=module.vision_embed_dim**-0.5 * factor,
            )
            module.logit_scale.data.fill_(self.config.logit_scale_init_value)
        if isinstance(module, nn.LayerNorm):
            module.bias.data.zero_()
            module.weight.data.fill_(1.0)
        if isinstance(module, nn.Linear):
            module.weight.data.normal_(mean=0.0, std=factor)
            if module.bias is not None:
                module.bias.data.zero_()


# Copied from transformers.models.owlvit.modeling_owlvit.OwlViTEncoder with OwlViT->Owlv2
class Owlv2Encoder(nn.Module):
    """
    Transformer encoder consisting of `config.num_hidden_layers` self attention layers. Each layer is a
    [`Owlv2EncoderLayer`].

    Args:
        config: Owlv2Config
    """

    def __init__(self, config: Owlv2Config):
        super().__init__()
        self.layers = nn.ModuleList([Owlv2EncoderLayer(config) for _ in range(config.num_hidden_layers)])
        self.gradient_checkpointing = False

    def forward(
        self,
        inputs_embeds,
        attention_mask: Optional[torch.Tensor] = None,
        causal_attention_mask: Optional[torch.Tensor] = None,
        output_attentions: Optional[bool] = None,
        output_hidden_states: Optional[bool] = None,
        return_dict: Optional[bool] = None,
    ) -> Union[tuple, BaseModelOutput]:
        r"""
        Args:
            inputs_embeds (`torch.FloatTensor` of shape `(batch_size, sequence_length, hidden_size)`).
            attention_mask (`torch.Tensor` of shape `(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#attention-mask)
            causal_attention_mask (`torch.Tensor` of shape `(batch_size, sequence_length)`, *optional*):
                Causal mask for the text model. Mask values selected in `[0, 1]`:
                - 1 for tokens that are **not masked**,
                - 0 for tokens that are **masked**.
                [What are attention masks?](../glossary#attention-mask)
            output_attentions (`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 (`bool`, *optional*):
                Whether or not to return the hidden states of all layers. See `hidden_states` under returned tensors
                for more detail.
            return_dict (`bool`, *optional*):
                Whether or not to return a [`~utils.ModelOutput`] instead of a plain tuple.
        """
        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

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

        hidden_states = inputs_embeds
        for encoder_layer in self.layers:
            if output_hidden_states:
                encoder_states = encoder_states + (hidden_states,)
            layer_outputs = encoder_layer(
                hidden_states,
                attention_mask,
                causal_attention_mask,
                output_attentions=output_attentions,
            )

            hidden_states = layer_outputs[0]

            if output_attentions:
                all_attentions = all_attentions + (layer_outputs[1],)

        if output_hidden_states:
            encoder_states = encoder_states + (hidden_states,)

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


# Copied from transformers.models.owlvit.modeling_owlvit.OwlViTTextTransformer with OWLVIT->OWLV2,OwlViT->Owlv2
class Owlv2TextTransformer(nn.Module):
    def __init__(self, config: Owlv2TextConfig):
        super().__init__()
        self.config = config
        embed_dim = config.hidden_size
        self.embeddings = Owlv2TextEmbeddings(config)
        self.encoder = Owlv2Encoder(config)
        self.final_layer_norm = nn.LayerNorm(embed_dim, eps=config.layer_norm_eps)

    @auto_docstring
    def forward(
        self,
        input_ids: torch.Tensor,
        attention_mask: Optional[torch.Tensor] = None,
        position_ids: Optional[torch.Tensor] = None,
        output_attentions: Optional[bool] = None,
        output_hidden_states: Optional[bool] = None,
        return_dict: Optional[bool] = None,
    ) -> Union[tuple, BaseModelOutputWithPooling]:
        r"""
        input_ids (`torch.LongTensor` of shape `(batch_size * num_max_text_queries, sequence_length)`):
            Indices of input sequence tokens in the vocabulary. Indices can be obtained using [`AutoTokenizer`]. See
            [`PreTrainedTokenizer.encode`] and [`PreTrainedTokenizer.__call__`] for details. [What are input
            IDs?](../glossary#input-ids)
        """
        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

        input_shape = input_ids.size()
        input_ids = input_ids.view(-1, input_shape[-1])
        hidden_states = self.embeddings(input_ids=input_ids, position_ids=position_ids)

        # num_samples, seq_len = input_shape  where num_samples = batch_size * num_max_text_queries
        # OWLV2's text model uses causal mask, prepare it here.
        # https://github.com/openai/CLIP/blob/cfcffb90e69f37bf2ff1e988237a0fbe41f33c04/clip/model.py#L324
        causal_attention_mask = _create_4d_causal_attention_mask(
            input_shape, hidden_states.dtype, device=hidden_states.device
        )
        # expand attention_mask
        if attention_mask is not None:
            # [num_samples, seq_len] -> [num_samples, 1, tgt_seq_len, src_seq_len]
            attention_mask = _prepare_4d_attention_mask(attention_mask, hidden_states.dtype)

        encoder_outputs = self.encoder(
            inputs_embeds=hidden_states,
            attention_mask=attention_mask,
            causal_attention_mask=causal_attention_mask,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            return_dict=return_dict,
        )

        last_hidden_state = encoder_outputs[0]
        last_hidden_state = self.final_layer_norm(last_hidden_state)

        # take features from the end of tokens embedding (end of token is the highest number in each sequence)
        # casting to torch.int for onnx compatibility: argmax doesn't support int64 inputs with opset 14
        pooled_output = last_hidden_state[
            torch.arange(last_hidden_state.shape[0], device=last_hidden_state.device),
            input_ids.to(torch.int).argmax(dim=-1).to(last_hidden_state.device),
        ]

        if not return_dict:
            return (last_hidden_state, pooled_output) + encoder_outputs[1:]

        return BaseModelOutputWithPooling(
            last_hidden_state=last_hidden_state,
            pooler_output=pooled_output,
            hidden_states=encoder_outputs.hidden_states,
            attentions=encoder_outputs.attentions,
        )


# Copied from transformers.models.owlvit.modeling_owlvit.OwlViTTextModel with google/owlvit-base-patch32->google/owlv2-base-patch16, OWLVIT->OWLV2,OwlViT->Owlv2
class Owlv2TextModel(Owlv2PreTrainedModel):
    config: Owlv2TextConfig
    input_modalities = "text"

    def __init__(self, config: Owlv2TextConfig):
        super().__init__(config)
        self.text_model = Owlv2TextTransformer(config)
        # Initialize weights and apply final processing
        self.post_init()

    def get_input_embeddings(self) -> nn.Module:
        return self.text_model.embeddings.token_embedding

    def set_input_embeddings(self, value):
        self.text_model.embeddings.token_embedding = value

    @auto_docstring
    def forward(
        self,
        input_ids: torch.Tensor,
        attention_mask: Optional[torch.Tensor] = None,
        output_attentions: Optional[bool] = None,
        output_hidden_states: Optional[bool] = None,
        return_dict: Optional[bool] = None,
    ) -> Union[tuple, BaseModelOutputWithPooling]:
        r"""
        input_ids (`torch.LongTensor` of shape `(batch_size * num_max_text_queries, sequence_length)`):
            Indices of input sequence tokens in the vocabulary. Indices can be obtained using [`AutoTokenizer`]. See
            [`PreTrainedTokenizer.encode`] and [`PreTrainedTokenizer.__call__`] for details. [What are input
            IDs?](../glossary#input-ids)

        Examples:
        ```python
        >>> from transformers import AutoProcessor, Owlv2TextModel

        >>> model = Owlv2TextModel.from_pretrained("google/owlv2-base-patch16")
        >>> processor = AutoProcessor.from_pretrained("google/owlv2-base-patch16")
        >>> inputs = processor(
        ...     text=[["a photo of a cat", "a photo of a dog"], ["photo of a astranaut"]], return_tensors="pt"
        ... )
        >>> outputs = model(**inputs)
        >>> last_hidden_state = outputs.last_hidden_state
        >>> pooled_output = outputs.pooler_output  # pooled (EOS token) states
        ```"""

        # Get embeddings for all text queries in all batch samples
        return self.text_model(
            input_ids=input_ids,
            attention_mask=attention_mask,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            return_dict=return_dict,
        )


# Copied from transformers.models.owlvit.modeling_owlvit.OwlViTVisionTransformer with OWLVIT->OWLV2,OwlViT->Owlv2
class Owlv2VisionTransformer(nn.Module):
    def __init__(self, config: Owlv2VisionConfig):
        super().__init__()
        self.config = config

        self.embeddings = Owlv2VisionEmbeddings(config)
        self.pre_layernorm = nn.LayerNorm(config.hidden_size, eps=config.layer_norm_eps)
        self.encoder = Owlv2Encoder(config)
        self.post_layernorm = nn.LayerNorm(config.hidden_size, eps=config.layer_norm_eps)

    @auto_docstring
    def forward(
        self,
        pixel_values: torch.FloatTensor,
        output_attentions: Optional[bool] = None,
        output_hidden_states: Optional[bool] = None,
        interpolate_pos_encoding: Optional[bool] = False,
        return_dict: Optional[bool] = None,
    ) -> Union[tuple, BaseModelOutputWithPooling]:
        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

        # Cast the input to the expected `dtype`
        expected_input_dtype = self.embeddings.patch_embedding.weight.dtype
        pixel_values = pixel_values.to(expected_input_dtype)

        hidden_states = self.embeddings(pixel_values, interpolate_pos_encoding=interpolate_pos_encoding)
        hidden_states = self.pre_layernorm(hidden_states)

        encoder_outputs = self.encoder(
            inputs_embeds=hidden_states,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            return_dict=return_dict,
        )

        last_hidden_state = encoder_outputs[0]
        pooled_output = last_hidden_state[:, 0, :]

        pooled_output = self.post_layernorm(pooled_output)

        if not return_dict:
            return (last_hidden_state, pooled_output) + encoder_outputs[1:]

        return BaseModelOutputWithPooling(
            last_hidden_state=last_hidden_state,
            pooler_output=pooled_output,
            hidden_states=encoder_outputs.hidden_states,
            attentions=encoder_outputs.attentions,
        )


# Copied from transformers.models.owlvit.modeling_owlvit.OwlViTVisionModel with OWLVIT->OWLV2,OwlViT->Owlv2,google/owlvit-base-patch32->google/owlv2-base-patch16
class Owlv2VisionModel(Owlv2PreTrainedModel):
    config: Owlv2VisionConfig
    main_input_name = "pixel_values"
    input_modalities = "image"

    def __init__(self, config: Owlv2VisionConfig):
        super().__init__(config)
        self.vision_model = Owlv2VisionTransformer(config)
        # Initialize weights and apply final processing
        self.post_init()

    def get_input_embeddings(self) -> nn.Module:
        return self.vision_model.embeddings.patch_embedding

    @auto_docstring
    def forward(
        self,
        pixel_values: Optional[torch.FloatTensor] = None,
        output_attentions: Optional[bool] = None,
        output_hidden_states: Optional[bool] = None,
        interpolate_pos_encoding: bool = False,
        return_dict: Optional[bool] = None,
    ) -> Union[tuple, BaseModelOutputWithPooling]:
        r"""
        Examples:
        ```python
        >>> from PIL import Image
        >>> import requests
        >>> from transformers import AutoProcessor, Owlv2VisionModel

        >>> model = Owlv2VisionModel.from_pretrained("google/owlv2-base-patch16")
        >>> processor = AutoProcessor.from_pretrained("google/owlv2-base-patch16")
        >>> url = "http://images.cocodataset.org/val2017/000000039769.jpg"
        >>> image = Image.open(requests.get(url, stream=True).raw)

        >>> inputs = processor(images=image, return_tensors="pt")

        >>> outputs = model(**inputs)
        >>> last_hidden_state = outputs.last_hidden_state
        >>> pooled_output = outputs.pooler_output  # pooled CLS states
        ```"""
        return self.vision_model(
            pixel_values=pixel_values,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            interpolate_pos_encoding=interpolate_pos_encoding,
            return_dict=return_dict,
        )


@auto_docstring
# Copied from transformers.models.owlvit.modeling_owlvit.OwlViTModel with google/owlvit-base-patch32->google/owlv2-base-patch16-ensemble, OWLVIT->OWLV2,OwlViT->Owlv2,owlvit->owlv2,OWL-ViT->OWLv2
class Owlv2Model(Owlv2PreTrainedModel):
    config: Owlv2Config

    def __init__(self, config: Owlv2Config):
        super().__init__(config)

        if not isinstance(config.text_config, Owlv2TextConfig):
            raise TypeError(
                "config.text_config is expected to be of type Owlv2TextConfig but is of type"
                f" {type(config.text_config)}."
            )

        if not isinstance(config.vision_config, Owlv2VisionConfig):
            raise TypeError(
                "config.vision_config is expected to be of type Owlv2VisionConfig but is of type"
                f" {type(config.vision_config)}."
            )

        text_config = config.text_config
        vision_config = config.vision_config

        self.projection_dim = config.projection_dim
        self.text_embed_dim = text_config.hidden_size
        self.vision_embed_dim = vision_config.hidden_size

        self.text_model = Owlv2TextTransformer(text_config)
        self.vision_model = Owlv2VisionTransformer(vision_config)

        self.visual_projection = nn.Linear(self.vision_embed_dim, self.projection_dim, bias=False)
        self.text_projection = nn.Linear(self.text_embed_dim, self.projection_dim, bias=False)
        self.logit_scale = nn.Parameter(torch.tensor(config.logit_scale_init_value))

        # Initialize weights and apply final processing
        self.post_init()

    @filter_out_non_signature_kwargs()
    @auto_docstring
    def get_text_features(
        self,
        input_ids: torch.Tensor,
        attention_mask: Optional[torch.Tensor] = None,
    ) -> torch.FloatTensor:
        r"""
        input_ids (`torch.LongTensor` of shape `(batch_size * num_max_text_queries, sequence_length)`):
            Indices of input sequence tokens in the vocabulary. Indices can be obtained using [`AutoTokenizer`]. See
            [`PreTrainedTokenizer.encode`] and [`PreTrainedTokenizer.__call__`] for details. [What are input
            IDs?](../glossary#input-ids)

        Returns:
            text_features (`torch.FloatTensor` of shape `(batch_size, output_dim`): The text embeddings obtained by
            applying the projection layer to the pooled output of [`Owlv2TextModel`].

        Examples:
        ```python
        >>> import torch
        >>> from transformers import AutoProcessor, Owlv2Model

        >>> model = Owlv2Model.from_pretrained("google/owlv2-base-patch16-ensemble")
        >>> processor = AutoProcessor.from_pretrained("google/owlv2-base-patch16-ensemble")
        >>> inputs = processor(
        ...     text=[["a photo of a cat", "a photo of a dog"], ["photo of a astranaut"]], return_tensors="pt"
        ... )
        >>> with torch.inference_mode():
        ...     text_features = model.get_text_features(**inputs)
        ```"""
        # Get embeddings for all text queries in all batch samples
        text_outputs: BaseModelOutputWithPooling = self.text_model(input_ids=input_ids, attention_mask=attention_mask)
        text_features = self.text_projection(text_outputs.pooler_output)

        return text_features

    @filter_out_non_signature_kwargs()
    @auto_docstring
    def get_image_features(
        self,
        pixel_values: torch.Tensor,
        interpolate_pos_encoding: bool = False,
    ) -> torch.FloatTensor:
        r"""
        Returns:
            image_features (`torch.FloatTensor` of shape `(batch_size, output_dim`): The image embeddings obtained by
            applying the projection layer to the pooled output of [`Owlv2VisionModel`].

        Examples:
        ```python
        >>> import torch
        >>> from transformers.image_utils import load_image
        >>> from transformers import AutoProcessor, Owlv2Model

        >>> model = Owlv2Model.from_pretrained("google/owlv2-base-patch16-ensemble")
        >>> processor = AutoProcessor.from_pretrained("google/owlv2-base-patch16-ensemble")

        >>> url = "http://images.cocodataset.org/val2017/000000039769.jpg"
        >>> image = load_image(url)

        >>> inputs = processor(images=image, return_tensors="pt")
        >>> with torch.inference_mode():
        ...     image_features = model.get_image_features(**inputs)
        ```"""
        vision_outputs: BaseModelOutputWithPooling = self.vision_model(
            pixel_values=pixel_values,
            interpolate_pos_encoding=interpolate_pos_encoding,
        )
        image_features = self.visual_projection(vision_outputs.pooler_output)

        return image_features

    @auto_docstring
    def forward(
        self,
        input_ids: Optional[torch.LongTensor] = None,
        pixel_values: Optional[torch.FloatTensor] = None,
        attention_mask: Optional[torch.Tensor] = None,
        return_loss: Optional[bool] = None,
        output_attentions: Optional[bool] = None,
        output_hidden_states: Optional[bool] = None,
        interpolate_pos_encoding: bool = False,
        return_base_image_embeds: Optional[bool] = None,
        return_dict: Optional[bool] = None,
    ) -> Union[tuple, Owlv2Output]:
        r"""
        return_loss (`bool`, *optional*):
            Whether or not to return the contrastive loss.
        return_base_image_embeds (`bool`, *optional*):
            Whether or not to return the base image embeddings.

        Examples:
        ```python
        >>> from PIL import Image
        >>> import requests
        >>> from transformers import AutoProcessor, Owlv2Model

        >>> model = Owlv2Model.from_pretrained("google/owlv2-base-patch16-ensemble")
        >>> processor = AutoProcessor.from_pretrained("google/owlv2-base-patch16-ensemble")
        >>> url = "http://images.cocodataset.org/val2017/000000039769.jpg"
        >>> image = Image.open(requests.get(url, stream=True).raw)
        >>> inputs = processor(text=[["a photo of a cat", "a photo of a dog"]], images=image, return_tensors="pt")
        >>> outputs = model(**inputs)
        >>> logits_per_image = outputs.logits_per_image  # this is the image-text similarity score
        >>> probs = logits_per_image.softmax(dim=1)  # we can take the softmax to get the label probabilities
        ```"""
        # Use OWLv2 model's config for some fields (if specified) instead of those of vision & text components.
        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

        vision_outputs = self.vision_model(
            pixel_values=pixel_values,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            interpolate_pos_encoding=interpolate_pos_encoding,
            return_dict=return_dict,
        )

        # Get embeddings for all text queries in all batch samples
        text_outputs = self.text_model(
            input_ids=input_ids,
            attention_mask=attention_mask,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            return_dict=return_dict,
        )

        text_embeds = text_outputs[1]
        text_embeds = self.text_projection(text_embeds)
        image_embeds = vision_outputs[1]
        image_embeds = self.visual_projection(image_embeds)

        # normalized features
        image_embeds = image_embeds / torch.linalg.norm(image_embeds, ord=2, dim=-1, keepdim=True)
        text_embeds_norm = text_embeds / torch.linalg.norm(text_embeds, ord=2, dim=-1, keepdim=True)

        # cosine similarity as logits and set it on the correct device
        logit_scale = self.logit_scale.exp().to(image_embeds.device)

        logits_per_text = torch.matmul(text_embeds_norm, image_embeds.t()) * logit_scale
        logits_per_image = logits_per_text.t()

        loss = None
        if return_loss:
            loss = owlv2_loss(logits_per_text)

        text_embeds = text_embeds_norm

        if not return_dict:
            output = (logits_per_image, logits_per_text, text_embeds, image_embeds, text_outputs, vision_outputs)
            return ((loss,) + output) if loss is not None else output

        return Owlv2Output(
            loss=loss,
            logits_per_image=logits_per_image,
            logits_per_text=logits_per_text,
            text_embeds=text_embeds,
            image_embeds=image_embeds,
            text_model_output=text_outputs,
            vision_model_output=vision_outputs,
        )


# Copied from transformers.models.owlvit.modeling_owlvit.OwlViTBoxPredictionHead with OwlViT->Owlv2
class Owlv2BoxPredictionHead(nn.Module):
    def __init__(self, config: Owlv2Config, out_dim: int = 4):
        super().__init__()

        width = config.vision_config.hidden_size
        self.dense0 = nn.Linear(width, width)
        self.dense1 = nn.Linear(width, width)
        self.gelu = nn.GELU()
        self.dense2 = nn.Linear(width, out_dim)

    def forward(self, image_features: torch.Tensor) -> torch.FloatTensor:
        output = self.dense0(image_features)
        output = self.gelu(output)
        output = self.dense1(output)
        output = self.gelu(output)
        output = self.dense2(output)
        return output


# Copied from transformers.models.owlvit.modeling_owlvit.OwlViTClassPredictionHead with OwlViT->Owlv2
class Owlv2ClassPredictionHead(nn.Module):
    def __init__(self, config: Owlv2Config):
        super().__init__()

        out_dim = config.text_config.hidden_size
        self.query_dim = config.vision_config.hidden_size

        self.dense0 = nn.Linear(self.query_dim, out_dim)
        self.logit_shift = nn.Linear(self.query_dim, 1)
        self.logit_scale = nn.Linear(self.query_dim, 1)
        self.elu = nn.ELU()

    def forward(
        self,
        image_embeds: torch.FloatTensor,
        query_embeds: Optional[torch.FloatTensor],
        query_mask: Optional[torch.Tensor],
    ) -> tuple[torch.FloatTensor]:
        image_class_embeds = self.dense0(image_embeds)
        if query_embeds is None:
            device = image_class_embeds.device
            batch_size, num_patches = image_class_embeds.shape[:2]
            pred_logits = torch.zeros((batch_size, num_patches, self.query_dim)).to(device)
            return (pred_logits, image_class_embeds)

        # Normalize image and text features
        image_class_embeds = image_class_embeds / (torch.linalg.norm(image_class_embeds, dim=-1, keepdim=True) + 1e-6)
        query_embeds = query_embeds / (torch.linalg.norm(query_embeds, dim=-1, keepdim=True) + 1e-6)

        # Get class predictions
        pred_logits = torch.einsum("...pd,...qd->...pq", image_class_embeds, query_embeds)

        # Apply a learnable shift and scale to logits
        logit_shift = self.logit_shift(image_embeds)
        logit_scale = self.logit_scale(image_embeds)
        logit_scale = self.elu(logit_scale) + 1
        pred_logits = (pred_logits + logit_shift) * logit_scale

        if query_mask is not None:
            if query_mask.ndim > 1:
                query_mask = torch.unsqueeze(query_mask, dim=-2)

            pred_logits = torch.where(query_mask == 0, torch.finfo(pred_logits.dtype).min, pred_logits)
            pred_logits = pred_logits.to(torch.float32)

        return (pred_logits, image_class_embeds)


class Owlv2ForObjectDetection(Owlv2PreTrainedModel):
    config: Owlv2Config

    def __init__(self, config: Owlv2Config):
        super().__init__(config)

        self.owlv2 = Owlv2Model(config)
        self.class_head = Owlv2ClassPredictionHead(config)
        self.box_head = Owlv2BoxPredictionHead(config)
        self.objectness_head = Owlv2BoxPredictionHead(config, out_dim=1)

        self.layer_norm = nn.LayerNorm(config.vision_config.hidden_size, eps=config.vision_config.layer_norm_eps)
        self.sigmoid = nn.Sigmoid()
        self.config = config
        self.num_patches_height = self.config.vision_config.image_size // self.config.vision_config.patch_size
        self.num_patches_width = self.config.vision_config.image_size // self.config.vision_config.patch_size
        self.box_bias = self.compute_box_bias(self.num_patches_height, self.num_patches_width)

        # Initialize weights and apply final processing
        self.post_init()

    @staticmethod
    # Copied from transformers.models.owlvit.modeling_owlvit.OwlViTForObjectDetection.normalize_grid_corner_coordinates
    def normalize_grid_corner_coordinates(num_patches_height: int, num_patches_width: int) -> torch.Tensor:
        # Create grid coordinates using torch
        x_coordinates = torch.arange(1, num_patches_width + 1, dtype=torch.float32)
        y_coordinates = torch.arange(1, num_patches_height + 1, dtype=torch.float32)
        xx, yy = torch.meshgrid(x_coordinates, y_coordinates, indexing="xy")

        # Stack the coordinates and divide by their respective patch counts
        box_coordinates = torch.stack((xx, yy), dim=-1)
        box_coordinates[..., 0] /= num_patches_width
        box_coordinates[..., 1] /= num_patches_height

        # Flatten (h, w, 2) -> (h*w, 2)
        box_coordinates = box_coordinates.view(-1, 2)

        return box_coordinates

    def objectness_predictor(self, image_features: torch.FloatTensor) -> torch.FloatTensor:
        """Predicts the probability that each image feature token is an object.

        Args:
            image_features (`torch.FloatTensor` of shape `(batch_size, num_patches, hidden_dim)`)):
                Features extracted from the image.
        Returns:
            Objectness scores.
        """
        image_features = image_features.detach()
        objectness_logits = self.objectness_head(image_features)
        objectness_logits = objectness_logits[..., 0]
        return objectness_logits

    @lru_cache(maxsize=2)
    # Copied from transformers.models.owlvit.modeling_owlvit.OwlViTForObjectDetection.compute_box_bias
    def compute_box_bias(
        self, num_patches_height: int, num_patches_width: int, feature_map: Optional[torch.FloatTensor] = None
    ) -> torch.Tensor:
        if feature_map is not None:
            raise ValueError("feature_map has been deprecated as an input. Please pass in num_patches instead")
        # The box center is biased to its position on the feature grid
        box_coordinates = self.normalize_grid_corner_coordinates(num_patches_height, num_patches_width)
        box_coordinates = torch.clip(box_coordinates, 0.0, 1.0)

        # Unnormalize xy
        box_coord_bias = torch.log(box_coordinates + 1e-4) - torch.log1p(-box_coordinates + 1e-4)

        # The box size is biased to the patch size
        box_size = torch.full_like(box_coord_bias, 1.0)
        box_size[..., 0] /= num_patches_width
        box_size[..., 1] /= num_patches_height
        box_size_bias = torch.log(box_size + 1e-4) - torch.log1p(-box_size + 1e-4)

        # Compute box bias
        box_bias = torch.cat([box_coord_bias, box_size_bias], dim=-1)
        return box_bias

    # Copied from transformers.models.owlvit.modeling_owlvit.OwlViTForObjectDetection.box_predictor
    def box_predictor(
        self,
        image_feats: torch.FloatTensor,
        feature_map: torch.FloatTensor,
        interpolate_pos_encoding: bool = False,
    ) -> torch.FloatTensor:
        """
        Args:
            image_feats:
                Features extracted from the image, returned by the `image_text_embedder` method.
            feature_map:
                A spatial re-arrangement of image_features, also returned by the `image_text_embedder` method.
            interpolate_pos_encoding:
                Whether to interpolate the pre-trained position encodings.
        Returns:
            pred_boxes:
                List of predicted boxes (cxcywh normalized to 0, 1) nested within a dictionary.
        """
        # Bounding box detection head [batch_size, num_boxes, 4].
        pred_boxes = self.box_head(image_feats)

        # Compute the location of each token on the grid and use it to compute a bias for the bbox prediction
        if interpolate_pos_encoding:
            _, num_patches_height, num_patches_width, _ = feature_map.shape
            box_bias = self.compute_box_bias(num_patches_height, num_patches_width)
        else:
            box_bias = self.box_bias

        box_bias = box_bias.to(feature_map.device)
        pred_boxes += box_bias
        pred_boxes = self.sigmoid(pred_boxes)
        return pred_boxes

    # Copied from transformers.models.owlvit.modeling_owlvit.OwlViTForObjectDetection.class_predictor
    def class_predictor(
        self,
        image_feats: torch.FloatTensor,
        query_embeds: Optional[torch.FloatTensor] = None,
        query_mask: Optional[torch.Tensor] = None,
    ) -> tuple[torch.FloatTensor]:
        """
        Args:
            image_feats:
                Features extracted from the `image_text_embedder`.
            query_embeds:
                Text query embeddings.
            query_mask:
                Must be provided with query_embeddings. A mask indicating which query embeddings are valid.
        """
        (pred_logits, image_class_embeds) = self.class_head(image_feats, query_embeds, query_mask)

        return (pred_logits, image_class_embeds)

    # Copied from transformers.models.owlvit.modeling_owlvit.OwlViTForObjectDetection.image_text_embedder with owlvit->owlv2
    def image_text_embedder(
        self,
        input_ids: torch.Tensor,
        pixel_values: torch.FloatTensor,
        attention_mask: torch.Tensor,
        output_attentions: Optional[bool] = None,
        output_hidden_states: Optional[bool] = None,
        interpolate_pos_encoding: bool = False,
    ) -> tuple[torch.FloatTensor]:
        # Encode text and image
        outputs = self.owlv2(
            pixel_values=pixel_values,
            input_ids=input_ids,
            attention_mask=attention_mask,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            interpolate_pos_encoding=interpolate_pos_encoding,
            return_dict=True,
        )

        if interpolate_pos_encoding:
            _, _, height, width = pixel_values.shape
            num_patches_height = height // self.config.vision_config.patch_size
            num_patches_width = width // self.config.vision_config.patch_size
        else:
            num_patches_height = self.num_patches_height
            num_patches_width = self.num_patches_width

        # Get image embeddings
        last_hidden_state = outputs.vision_model_output[0]
        image_embeds = self.owlv2.vision_model.post_layernorm(last_hidden_state)

        # Resize class token
        class_token_out = torch.broadcast_to(image_embeds[:, :1, :], image_embeds[:, :-1].shape)

        # Merge image embedding with class tokens
        image_embeds = image_embeds[:, 1:, :] * class_token_out
        image_embeds = self.layer_norm(image_embeds)

        # Resize to [batch_size, num_patches_height, num_patches_width, hidden_size]
        new_size = (
            image_embeds.shape[0],
            num_patches_height,
            num_patches_width,
            image_embeds.shape[-1],
        )
        image_embeds = image_embeds.reshape(new_size)
        text_embeds = outputs[-4]

        return (text_embeds, image_embeds, outputs)

    # Copied from transformers.models.owlvit.modeling_owlvit.OwlViTForObjectDetection.image_embedder with owlvit->owlv2, OwlViTModel->Owlv2Model
    def image_embedder(
        self,
        pixel_values: torch.FloatTensor,
        output_attentions: Optional[bool] = None,
        output_hidden_states: Optional[bool] = None,
        interpolate_pos_encoding: bool = False,
    ) -> tuple[torch.FloatTensor]:
        # Get Owlv2Model vision embeddings (same as CLIP)
        vision_outputs = self.owlv2.vision_model(
            pixel_values=pixel_values, interpolate_pos_encoding=interpolate_pos_encoding, return_dict=True
        )

        if interpolate_pos_encoding:
            _, _, height, width = pixel_values.shape
            num_patches_height = height // self.config.vision_config.patch_size
            num_patches_width = width // self.config.vision_config.patch_size
        else:
            num_patches_height = self.num_patches_height
            num_patches_width = self.num_patches_width

        # Apply post_layernorm to last_hidden_state, return non-projected output
        last_hidden_state = vision_outputs[0]
        image_embeds = self.owlv2.vision_model.post_layernorm(last_hidden_state)

        # Resize class token
        class_token_out = torch.broadcast_to(image_embeds[:, :1, :], image_embeds[:, :-1].shape)

        # Merge image embedding with class tokens
        image_embeds = image_embeds[:, 1:, :] * class_token_out
        image_embeds = self.layer_norm(image_embeds)

        # Resize to [batch_size, num_patches_height, num_patches_width, hidden_size]
        new_size = (
            image_embeds.shape[0],
            num_patches_height,
            num_patches_width,
            image_embeds.shape[-1],
        )
        image_embeds = image_embeds.reshape(new_size)

        return (image_embeds, vision_outputs)

    # Copied from transformers.models.owlvit.modeling_owlvit.OwlViTForObjectDetection.embed_image_query
    def embed_image_query(
        self,
        query_image_features: torch.FloatTensor,
        query_feature_map: torch.FloatTensor,
        interpolate_pos_encoding: bool = False,
    ) -> torch.FloatTensor:
        _, class_embeds = self.class_predictor(query_image_features)
        pred_boxes = self.box_predictor(query_image_features, query_feature_map, interpolate_pos_encoding)
        pred_boxes_as_corners = center_to_corners_format(pred_boxes)

        # Loop over query images
        best_class_embeds = []
        best_box_indices = []
        pred_boxes_device = pred_boxes_as_corners.device

        for i in range(query_image_features.shape[0]):
            each_query_box = torch.tensor([[0, 0, 1, 1]], device=pred_boxes_device)
            each_query_pred_boxes = pred_boxes_as_corners[i]
            ious, _ = box_iou(each_query_box, each_query_pred_boxes)

            # If there are no overlapping boxes, fall back to generalized IoU
            if torch.all(ious[0] == 0.0):
                ious = generalized_box_iou(each_query_box, each_query_pred_boxes)

            # Use an adaptive threshold to include all boxes within 80% of the best IoU
            iou_threshold = torch.max(ious) * 0.8

            selected_inds = (ious[0] >= iou_threshold).nonzero()
            if selected_inds.numel():
                selected_embeddings = class_embeds[i][selected_inds.squeeze(1)]
                mean_embeds = torch.mean(class_embeds[i], axis=0)
                mean_sim = torch.einsum("d,id->i", mean_embeds, selected_embeddings)
                best_box_ind = selected_inds[torch.argmin(mean_sim)]
                best_class_embeds.append(class_embeds[i][best_box_ind])
                best_box_indices.append(best_box_ind)

        if best_class_embeds:
            query_embeds = torch.stack(best_class_embeds)
            box_indices = torch.stack(best_box_indices)
        else:
            query_embeds, box_indices = None, None

        return query_embeds, box_indices, pred_boxes

    @auto_docstring
    def image_guided_detection(
        self,
        pixel_values: torch.FloatTensor,
        query_pixel_values: Optional[torch.FloatTensor] = None,
        output_attentions: Optional[bool] = None,
        output_hidden_states: Optional[bool] = None,
        interpolate_pos_encoding: bool = False,
        return_dict: Optional[bool] = None,
    ) -> Owlv2ImageGuidedObjectDetectionOutput:
        r"""
        query_pixel_values (`torch.FloatTensor` of shape `(batch_size, num_channels, height, width)`):
            Pixel values of query image(s) to be detected. Pass in one query image per target image.

        Examples:
        ```python
        >>> import requests
        >>> from PIL import Image
        >>> import torch
        >>> from transformers import AutoProcessor, Owlv2ForObjectDetection

        >>> processor = AutoProcessor.from_pretrained("google/owlv2-base-patch16-ensemble")
        >>> model = Owlv2ForObjectDetection.from_pretrained("google/owlv2-base-patch16-ensemble")

        >>> url = "http://images.cocodataset.org/val2017/000000039769.jpg"
        >>> image = Image.open(requests.get(url, stream=True).raw)
        >>> query_url = "http://images.cocodataset.org/val2017/000000001675.jpg"
        >>> query_image = Image.open(requests.get(query_url, stream=True).raw)
        >>> inputs = processor(images=image, query_images=query_image, return_tensors="pt")

        >>> # forward pass
        >>> with torch.no_grad():
        ...     outputs = model.image_guided_detection(**inputs)

        >>> target_sizes = torch.Tensor([image.size[::-1]])

        >>> # Convert outputs (bounding boxes and class logits) to Pascal VOC format (xmin, ymin, xmax, ymax)
        >>> results = processor.post_process_image_guided_detection(
        ...     outputs=outputs, threshold=0.9, nms_threshold=0.3, target_sizes=target_sizes
        ... )
        >>> i = 0  # Retrieve predictions for the first image
        >>> boxes, scores = results[i]["boxes"], results[i]["scores"]
        >>> for box, score in zip(boxes, scores):
        ...     box = [round(i, 2) for i in box.tolist()]
        ...     print(f"Detected similar object with confidence {round(score.item(), 3)} at location {box}")
        Detected similar object with confidence 0.938 at location [327.31, 54.94, 547.39, 268.06]
        Detected similar object with confidence 0.959 at location [5.78, 360.65, 619.12, 366.39]
        Detected similar object with confidence 0.902 at location [2.85, 360.01, 627.63, 380.8]
        Detected similar object with confidence 0.985 at location [176.98, -29.45, 672.69, 182.83]
        Detected similar object with confidence 1.0 at location [6.53, 14.35, 624.87, 470.82]
        Detected similar object with confidence 0.998 at location [579.98, 29.14, 615.49, 489.05]
        Detected similar object with confidence 0.985 at location [206.15, 10.53, 247.74, 466.01]
        Detected similar object with confidence 0.947 at location [18.62, 429.72, 646.5, 457.72]
        Detected similar object with confidence 0.996 at location [523.88, 20.69, 586.84, 483.18]
        Detected similar object with confidence 0.998 at location [3.39, 360.59, 617.29, 499.21]
        Detected similar object with confidence 0.969 at location [4.47, 449.05, 614.5, 474.76]
        Detected similar object with confidence 0.966 at location [31.44, 463.65, 654.66, 471.07]
        Detected similar object with confidence 0.924 at location [30.93, 468.07, 635.35, 475.39]
        ```"""
        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.return_dict

        # Compute feature maps for the input and query images
        query_feature_map = self.image_embedder(
            pixel_values=query_pixel_values, interpolate_pos_encoding=interpolate_pos_encoding
        )[0]
        feature_map, vision_outputs = self.image_embedder(
            pixel_values=pixel_values,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            interpolate_pos_encoding=interpolate_pos_encoding,
        )

        batch_size, num_patches_height, num_patches_width, hidden_dim = feature_map.shape
        image_feats = torch.reshape(feature_map, (batch_size, num_patches_height * num_patches_width, hidden_dim))

        batch_size, num_patches_height, num_patches_width, hidden_dim = query_feature_map.shape
        query_image_feats = torch.reshape(
            query_feature_map, (batch_size, num_patches_height * num_patches_width, hidden_dim)
        )
        # Get top class embedding and best box index for each query image in batch
        query_embeds, best_box_indices, query_pred_boxes = self.embed_image_query(
            query_image_feats, query_feature_map, interpolate_pos_encoding
        )

        # Predict object classes [batch_size, num_patches, num_queries+1]
        (pred_logits, class_embeds) = self.class_predictor(image_feats=image_feats, query_embeds=query_embeds)

        # Predict object boxes
        target_pred_boxes = self.box_predictor(image_feats, feature_map, interpolate_pos_encoding)

        if not return_dict:
            output = (
                feature_map,
                query_feature_map,
                target_pred_boxes,
                query_pred_boxes,
                pred_logits,
                class_embeds,
                vision_outputs.to_tuple(),
            )
            output = tuple(x for x in output if x is not None)
            return output

        return Owlv2ImageGuidedObjectDetectionOutput(
            image_embeds=feature_map,
            query_image_embeds=query_feature_map,
            target_pred_boxes=target_pred_boxes,
            query_pred_boxes=query_pred_boxes,
            logits=pred_logits,
            class_embeds=class_embeds,
            text_model_output=None,
            vision_model_output=vision_outputs,
        )

    @auto_docstring
    def forward(
        self,
        input_ids: torch.Tensor,
        pixel_values: torch.FloatTensor,
        attention_mask: Optional[torch.Tensor] = None,
        output_attentions: Optional[bool] = None,
        output_hidden_states: Optional[bool] = None,
        interpolate_pos_encoding: bool = False,
        return_dict: Optional[bool] = None,
    ) -> Owlv2ObjectDetectionOutput:
        r"""
        input_ids (`torch.LongTensor` of shape `(batch_size * num_max_text_queries, sequence_length)`, *optional*):
            Indices of input sequence tokens in the vocabulary. Indices can be obtained using [`AutoTokenizer`]. See
            [`PreTrainedTokenizer.encode`] and [`PreTrainedTokenizer.__call__`] for details. [What are input
            IDs?](../glossary#input-ids).
        output_hidden_states (`bool`, *optional*):
            Whether or not to return the last hidden state. See `text_model_last_hidden_state` and
            `vision_model_last_hidden_state` under returned tensors for more detail.

        Examples:
        ```python
        >>> import requests
        >>> from PIL import Image
        >>> import torch

        >>> from transformers import Owlv2Processor, Owlv2ForObjectDetection

        >>> processor = Owlv2Processor.from_pretrained("google/owlv2-base-patch16-ensemble")
        >>> model = Owlv2ForObjectDetection.from_pretrained("google/owlv2-base-patch16-ensemble")

        >>> url = "http://images.cocodataset.org/val2017/000000039769.jpg"
        >>> image = Image.open(requests.get(url, stream=True).raw)
        >>> text_labels = [["a photo of a cat", "a photo of a dog"]]
        >>> inputs = processor(text=text_labels, images=image, return_tensors="pt")
        >>> outputs = model(**inputs)

        >>> # Target image sizes (height, width) to rescale box predictions [batch_size, 2]
        >>> target_sizes = torch.tensor([(image.height, image.width)])
        >>> # Convert outputs (bounding boxes and class logits) to Pascal VOC format (xmin, ymin, xmax, ymax)
        >>> results = processor.post_process_grounded_object_detection(
        ...     outputs=outputs, target_sizes=target_sizes, threshold=0.1, text_labels=text_labels
        ... )
        >>> # Retrieve predictions for the first image for the corresponding text queries
        >>> result = results[0]
        >>> boxes, scores, text_labels = result["boxes"], result["scores"], result["text_labels"]
        >>> for box, score, text_label in zip(boxes, scores, text_labels):
        ...     box = [round(i, 2) for i in box.tolist()]
        ...     print(f"Detected {text_label} with confidence {round(score.item(), 3)} at location {box}")
        Detected a photo of a cat with confidence 0.614 at location [341.67, 23.39, 642.32, 371.35]
        Detected a photo of a cat with confidence 0.665 at location [6.75, 51.96, 326.62, 473.13]
        ```"""
        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.return_dict

        # Embed images and text queries
        query_embeds, feature_map, outputs = self.image_text_embedder(
            input_ids=input_ids,
            pixel_values=pixel_values,
            attention_mask=attention_mask,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            interpolate_pos_encoding=interpolate_pos_encoding,
        )

        # Text and vision model outputs
        text_outputs = outputs.text_model_output
        vision_outputs = outputs.vision_model_output

        batch_size, num_patches_height, num_patches_width, hidden_dim = feature_map.shape
        image_feats = torch.reshape(feature_map, (batch_size, num_patches_height * num_patches_width, hidden_dim))

        # Reshape from [batch_size * max_text_queries, hidden_dim] -> [batch_size, max_text_queries, hidden_dim]
        max_text_queries = input_ids.shape[0] // batch_size
        query_embeds = query_embeds.reshape(batch_size, max_text_queries, query_embeds.shape[-1])

        # If first token is 0, then this is a padded query [batch_size, num_queries].
        input_ids = input_ids.reshape(batch_size, max_text_queries, input_ids.shape[-1])
        query_mask = input_ids[..., 0] > 0

        # Predict object classes [batch_size, num_patches, num_queries+1]
        (pred_logits, class_embeds) = self.class_predictor(image_feats, query_embeds, query_mask)

        # Predict objectness
        objectness_logits = self.objectness_predictor(image_feats)

        # Predict object boxes
        pred_boxes = self.box_predictor(image_feats, feature_map, interpolate_pos_encoding)

        if not return_dict:
            output = (
                pred_logits,
                objectness_logits,
                pred_boxes,
                query_embeds,
                feature_map,
                class_embeds,
                text_outputs.to_tuple(),
                vision_outputs.to_tuple(),
            )
            output = tuple(x for x in output if x is not None)
            return output

        return Owlv2ObjectDetectionOutput(
            image_embeds=feature_map,
            text_embeds=query_embeds,
            pred_boxes=pred_boxes,
            logits=pred_logits,
            objectness_logits=objectness_logits,
            class_embeds=class_embeds,
            text_model_output=text_outputs,
            vision_model_output=vision_outputs,
        )


__all__ = ["Owlv2Model", "Owlv2PreTrainedModel", "Owlv2TextModel", "Owlv2VisionModel", "Owlv2ForObjectDetection"]
