qwen2.py 16.4 KB
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# coding=utf-8
# Adapted from
# https://github.com/huggingface/transformers/blob/v4.28.0/src/transformers/models/qwen2/modeling_qwen2.py
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# Copyright 2024 The Qwen team.
# Copyright 2023 The vLLM team.
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# Copyright 2022 EleutherAI and the HuggingFace Inc. team. All rights reserved.
#
# This code is based on EleutherAI's GPT-NeoX library and the GPT-NeoX
# and OPT implementations in this library. It has been modified from its
# original forms to accommodate minor architectural differences compared
# to GPT-NeoX and OPT used by the Meta AI team that trained the model.
#
# 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.
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"""Inference-only Qwen2 model compatible with HuggingFace weights."""
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from typing import Iterable, List, Optional, Tuple
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import torch
from torch import nn
from transformers import Qwen2Config

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from vllm.attention import Attention, AttentionMetadata
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from vllm.config import CacheConfig, LoRAConfig
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from vllm.distributed import get_pp_group, get_tensor_model_parallel_world_size
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from vllm.model_executor.layers.activation import SiluAndMul
from vllm.model_executor.layers.layernorm import RMSNorm
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from vllm.model_executor.layers.linear import (MergedColumnParallelLinear,
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                                               QKVParallelLinear,
                                               RowParallelLinear)
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from vllm.model_executor.layers.logits_processor import LogitsProcessor
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from vllm.model_executor.layers.quantization.base_config import (
    QuantizationConfig)
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from vllm.model_executor.layers.rotary_embedding import get_rope
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from vllm.model_executor.layers.sampler import Sampler
from vllm.model_executor.layers.vocab_parallel_embedding import (
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    ParallelLMHead, VocabParallelEmbedding)
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from vllm.model_executor.model_loader.weight_utils import (
    default_weight_loader, maybe_remap_kv_scale_name)
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from vllm.model_executor.sampling_metadata import SamplingMetadata
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from vllm.sequence import IntermediateTensors, SamplerOutput
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from .interfaces import SupportsLoRA
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from .utils import is_pp_missing_parameter, make_layers
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class Qwen2MLP(nn.Module):

    def __init__(
        self,
        hidden_size: int,
        intermediate_size: int,
        hidden_act: str,
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        quant_config: Optional[QuantizationConfig] = None,
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    ) -> None:
        super().__init__()
        self.gate_up_proj = MergedColumnParallelLinear(
            hidden_size, [intermediate_size] * 2,
            bias=False,
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            quant_config=quant_config)
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        self.down_proj = RowParallelLinear(intermediate_size,
                                           hidden_size,
                                           bias=False,
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                                           quant_config=quant_config)
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        if hidden_act != "silu":
            raise ValueError(f"Unsupported activation: {hidden_act}. "
                             "Only silu is supported for now.")
        self.act_fn = SiluAndMul()

    def forward(self, x):
        gate_up, _ = self.gate_up_proj(x)
        x = self.act_fn(gate_up)
        x, _ = self.down_proj(x)
        return x


class Qwen2Attention(nn.Module):

    def __init__(self,
                 hidden_size: int,
                 num_heads: int,
                 num_kv_heads: int,
                 max_position: int = 4096 * 32,
                 rope_theta: float = 10000,
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                 cache_config: Optional[CacheConfig] = None,
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                 quant_config: Optional[QuantizationConfig] = None,
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                 rope_scaling: Optional[Tuple] = None) -> None:
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        super().__init__()
        self.hidden_size = hidden_size
        tp_size = get_tensor_model_parallel_world_size()
        self.total_num_heads = num_heads
        assert self.total_num_heads % tp_size == 0
        self.num_heads = self.total_num_heads // tp_size
        self.total_num_kv_heads = num_kv_heads
        if self.total_num_kv_heads >= tp_size:
            # Number of KV heads is greater than TP size, so we partition
            # the KV heads across multiple tensor parallel GPUs.
            assert self.total_num_kv_heads % tp_size == 0
        else:
            # Number of KV heads is less than TP size, so we replicate
            # the KV heads across multiple tensor parallel GPUs.
            assert tp_size % self.total_num_kv_heads == 0
        self.num_kv_heads = max(1, self.total_num_kv_heads // tp_size)
        self.head_dim = hidden_size // self.total_num_heads
        self.q_size = self.num_heads * self.head_dim
        self.kv_size = self.num_kv_heads * self.head_dim
        self.scaling = self.head_dim**-0.5
        self.rope_theta = rope_theta

        self.qkv_proj = QKVParallelLinear(
            hidden_size,
            self.head_dim,
            self.total_num_heads,
            self.total_num_kv_heads,
            bias=True,
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            quant_config=quant_config,
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        )
        self.o_proj = RowParallelLinear(
            self.total_num_heads * self.head_dim,
            hidden_size,
            bias=False,
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            quant_config=quant_config,
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        )

        self.rotary_emb = get_rope(
            self.head_dim,
            rotary_dim=self.head_dim,
            max_position=max_position,
            base=self.rope_theta,
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            rope_scaling=rope_scaling,
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        )
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        self.attn = Attention(self.num_heads,
                              self.head_dim,
                              self.scaling,
                              num_kv_heads=self.num_kv_heads,
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                              cache_config=cache_config,
                              quant_config=quant_config)
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    def forward(
        self,
        positions: torch.Tensor,
        hidden_states: torch.Tensor,
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        kv_cache: torch.Tensor,
        attn_metadata: AttentionMetadata,
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    ) -> torch.Tensor:
        qkv, _ = self.qkv_proj(hidden_states)
        q, k, v = qkv.split([self.q_size, self.kv_size, self.kv_size], dim=-1)
        q, k = self.rotary_emb(positions, q, k)
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        attn_output = self.attn(q, k, v, kv_cache, attn_metadata)
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        output, _ = self.o_proj(attn_output)
        return output


class Qwen2DecoderLayer(nn.Module):

    def __init__(
        self,
        config: Qwen2Config,
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        cache_config: Optional[CacheConfig] = None,
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        quant_config: Optional[QuantizationConfig] = None,
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    ) -> None:
        super().__init__()
        self.hidden_size = config.hidden_size
        # Requires transformers > 4.32.0
        rope_theta = getattr(config, "rope_theta", 1000000)
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        rope_scaling = getattr(config, "rope_scaling", None)
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        self.self_attn = Qwen2Attention(
            hidden_size=self.hidden_size,
            num_heads=config.num_attention_heads,
            max_position=config.max_position_embeddings,
            num_kv_heads=config.num_key_value_heads,
            rope_theta=rope_theta,
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            cache_config=cache_config,
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            quant_config=quant_config,
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            rope_scaling=rope_scaling)
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        self.mlp = Qwen2MLP(
            hidden_size=self.hidden_size,
            intermediate_size=config.intermediate_size,
            hidden_act=config.hidden_act,
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            quant_config=quant_config,
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        )
        self.input_layernorm = RMSNorm(config.hidden_size,
                                       eps=config.rms_norm_eps)
        self.post_attention_layernorm = RMSNorm(config.hidden_size,
                                                eps=config.rms_norm_eps)

    def forward(
        self,
        positions: torch.Tensor,
        hidden_states: torch.Tensor,
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        kv_cache: torch.Tensor,
        attn_metadata: AttentionMetadata,
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        residual: Optional[torch.Tensor],
    ) -> Tuple[torch.Tensor, torch.Tensor]:
        # Self Attention
        if residual is None:
            residual = hidden_states
            hidden_states = self.input_layernorm(hidden_states)
        else:
            hidden_states, residual = self.input_layernorm(
                hidden_states, residual)
        hidden_states = self.self_attn(
            positions=positions,
            hidden_states=hidden_states,
            kv_cache=kv_cache,
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            attn_metadata=attn_metadata,
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        )

        # Fully Connected
        hidden_states, residual = self.post_attention_layernorm(
            hidden_states, residual)
        hidden_states = self.mlp(hidden_states)
        return hidden_states, residual


class Qwen2Model(nn.Module):

    def __init__(
        self,
        config: Qwen2Config,
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        cache_config: Optional[CacheConfig] = None,
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        quant_config: Optional[QuantizationConfig] = None,
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        prefix: str = "",
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    ) -> None:
        super().__init__()
        self.config = config
        self.padding_idx = config.pad_token_id
        self.vocab_size = config.vocab_size

        self.embed_tokens = VocabParallelEmbedding(
            config.vocab_size,
            config.hidden_size,
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            quant_config=quant_config,
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        )
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        self.start_layer, self.end_layer, self.layers = make_layers(
            config.num_hidden_layers,
            lambda prefix: Qwen2DecoderLayer(config=config,
                                             cache_config=cache_config,
                                             quant_config=quant_config),
            prefix=f"{prefix}.layers",
        )

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        self.norm = RMSNorm(config.hidden_size, eps=config.rms_norm_eps)

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    def get_input_embeddings(self, input_ids: torch.Tensor) -> torch.Tensor:
        return self.embed_tokens(input_ids)

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    def forward(
        self,
        input_ids: torch.Tensor,
        positions: torch.Tensor,
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        kv_caches: List[torch.Tensor],
        attn_metadata: AttentionMetadata,
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        intermediate_tensors: Optional[IntermediateTensors] = None,
        inputs_embeds: Optional[torch.Tensor] = None,
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    ) -> torch.Tensor:
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        if get_pp_group().is_first_rank:
            if inputs_embeds is not None:
                hidden_states = inputs_embeds
            else:
                hidden_states = self.embed_tokens(input_ids)
            residual = None
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        else:
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            assert intermediate_tensors is not None
            hidden_states = intermediate_tensors["hidden_states"]
            residual = intermediate_tensors["residual"]
        for i in range(self.start_layer, self.end_layer):
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            layer = self.layers[i]
            hidden_states, residual = layer(
                positions,
                hidden_states,
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                kv_caches[i - self.start_layer],
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                attn_metadata,
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                residual,
            )
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        if not get_pp_group().is_last_rank:
            return IntermediateTensors({
                "hidden_states": hidden_states,
                "residual": residual
            })
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        hidden_states, _ = self.norm(hidden_states, residual)
        return hidden_states


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class Qwen2ForCausalLM(nn.Module, SupportsLoRA):
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    packed_modules_mapping = {
        "qkv_proj": [
            "q_proj",
            "k_proj",
            "v_proj",
        ],
        "gate_up_proj": [
            "gate_proj",
            "up_proj",
        ],
    }

    # LoRA specific attributes
    supported_lora_modules = [
        "qkv_proj",
        "o_proj",
        "gate_up_proj",
        "down_proj",
    ]
    embedding_modules = {}
    embedding_padding_modules = []
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    def __init__(
        self,
        config: Qwen2Config,
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        cache_config: Optional[CacheConfig] = None,
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        quant_config: Optional[QuantizationConfig] = None,
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        lora_config: Optional[LoRAConfig] = None,
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    ) -> None:
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        # TODO (@robertgshaw2): see if this can be moved out
        if (cache_config.sliding_window is not None
                and hasattr(config, "max_window_layers")):
            raise ValueError("Sliding window for some but all layers is not "
                             "supported. This model uses sliding window "
                             "but `max_window_layers` = %s is less than "
                             "`num_hidden_layers` = %s. Please open an issue "
                             "to discuss this feature." % (
                                 config.max_window_layers,
                                 config.num_hidden_layers,
                             ))

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        super().__init__()
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        self.config = config
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        self.lora_config = lora_config

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        self.quant_config = quant_config
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        self.model = Qwen2Model(config, cache_config, quant_config)
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        if config.tie_word_embeddings:
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            self.lm_head = self.model.embed_tokens
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        else:
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            self.lm_head = ParallelLMHead(config.vocab_size,
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                                          config.hidden_size,
                                          quant_config=quant_config)
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        self.logits_processor = LogitsProcessor(config.vocab_size)
        self.sampler = Sampler()
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    def forward(
        self,
        input_ids: torch.Tensor,
        positions: torch.Tensor,
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        kv_caches: List[torch.Tensor],
        attn_metadata: AttentionMetadata,
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        intermediate_tensors: Optional[IntermediateTensors] = None,
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    ) -> torch.Tensor:
        hidden_states = self.model(input_ids, positions, kv_caches,
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                                   attn_metadata, intermediate_tensors)
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        return hidden_states

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    def compute_logits(self, hidden_states: torch.Tensor,
                       sampling_metadata: SamplingMetadata) -> torch.Tensor:
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        logits = self.logits_processor(self.lm_head, hidden_states,
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                                       sampling_metadata)
        return logits

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    def make_empty_intermediate_tensors(
            self, batch_size: int, dtype: torch.dtype,
            device: torch.device) -> IntermediateTensors:
        return IntermediateTensors({
            "hidden_states":
            torch.zeros((batch_size, self.config.hidden_size),
                        dtype=dtype,
                        device=device),
            "residual":
            torch.zeros((batch_size, self.config.hidden_size),
                        dtype=dtype,
                        device=device),
        })

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    def sample(
        self,
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        logits: torch.Tensor,
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        sampling_metadata: SamplingMetadata,
    ) -> Optional[SamplerOutput]:
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        next_tokens = self.sampler(logits, sampling_metadata)
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        return next_tokens

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    def load_weights(self, weights: Iterable[Tuple[str, torch.Tensor]]):
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        stacked_params_mapping = [
            # (param_name, shard_name, shard_id)
            ("qkv_proj", "q_proj", "q"),
            ("qkv_proj", "k_proj", "k"),
            ("qkv_proj", "v_proj", "v"),
            ("gate_up_proj", "gate_proj", 0),
            ("gate_up_proj", "up_proj", 1),
        ]
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        params_dict = dict(self.named_parameters(remove_duplicate=False))
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        for name, loaded_weight in weights:
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            if "rotary_emb.inv_freq" in name:
                continue
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            if self.config.tie_word_embeddings and "lm_head.weight" in name:
                continue
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            for (param_name, weight_name, shard_id) in stacked_params_mapping:
                if weight_name not in name:
                    continue
                name = name.replace(weight_name, param_name)
                # Skip loading extra bias for GPTQ models.
                if name.endswith(".bias") and name not in params_dict:
                    continue
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                if is_pp_missing_parameter(name, self):
                    continue
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                param = params_dict[name]
                weight_loader = param.weight_loader
                weight_loader(param, loaded_weight, shard_id)
                break
            else:
                # Skip loading extra bias for GPTQ models.
                if name.endswith(".bias") and name not in params_dict:
                    continue
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                # Remapping the name of FP8 kv-scale.
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                name = maybe_remap_kv_scale_name(name, params_dict)
                if name is None:
                    continue
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                if is_pp_missing_parameter(name, self):
                    continue
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                param = params_dict[name]
                weight_loader = getattr(param, "weight_loader",
                                        default_weight_loader)
                weight_loader(param, loaded_weight)