# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project

# Copyright 2025 The Baidu team.
# Copyright 2023 The vLLM team.
# 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.
"""Inference-only Erine VL model compatible with HuggingFace weights."""

from collections.abc import Iterable
from itertools import islice
from typing import Any

import torch
from torch import nn
from transformers import PretrainedConfig

# from vllm.compilation.decorators import support_torch_compile
from vllm.config import CacheConfig, VllmConfig
from vllm.distributed import get_pp_group, get_tensor_model_parallel_world_size
from vllm.logger import init_logger
from vllm.model_executor.layers.attention import Attention
from vllm.model_executor.layers.fused_moe import SharedFusedMoE
from vllm.model_executor.layers.layernorm import RMSNorm
from vllm.model_executor.layers.linear import (
    QKVParallelLinear,
    ReplicatedLinear,
    RowParallelLinear,
)
from vllm.model_executor.layers.logits_processor import LogitsProcessor
from vllm.model_executor.layers.quantization import QuantizationConfig
from vllm.model_executor.layers.rotary_embedding.ernie45_vl_rope import (
    Ernie4_5_VLRotaryEmbedding,
)
from vllm.model_executor.layers.vocab_parallel_embedding import (
    ParallelLMHead,
    VocabParallelEmbedding,
)
from vllm.model_executor.model_loader.weight_utils import (
    default_weight_loader,
    maybe_remap_kv_scale_name,
)
from vllm.sequence import IntermediateTensors
from vllm.transformers_utils.config import set_default_rope_theta

from .ernie45_moe import Ernie4_5_MoeMLP
from .interfaces import SupportsPP
from .utils import (
    PPMissingLayer,
    extract_layer_index,
    is_pp_missing_parameter,
    make_empty_intermediate_tensors_factory,
    make_layers,
    maybe_prefix,
)

logger = init_logger(__name__)


class Ernie4_5_VLMoeMLP(Ernie4_5_MoeMLP):
    def __init__(self, shared_experts: torch.nn.Module | None = None, **kwargs):
        super().__init__(**kwargs)
        self.shared_experts = shared_experts

    def forward(self, x):
        if self.shared_experts is not None:
            return self.shared_experts(x) + super().forward(x)
        else:
            return super().forward(x)


class Ernie4_5_VLMoeAttention(nn.Module):
    def __init__(
        self,
        hidden_size: int,
        num_heads: int,
        num_kv_heads: int,
        rope_parameters: dict[str, Any],
        head_dim: int | None = None,
        freq_allocation: int = 20,
        max_position_embeddings: int = 131072,
        rms_norm_eps: float = 1e-05,
        qkv_bias: bool = False,
        cache_config: CacheConfig | None = None,
        quant_config: QuantizationConfig | None = None,
        prefix: str = "",
    ) -> None:
        super().__init__()
        layer_idx = extract_layer_index(prefix) if len(prefix) > 0 else 0
        self.layer_idx = layer_idx
        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 = head_dim or (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.max_position_embeddings = max_position_embeddings

        self.qkv_proj = QKVParallelLinear(
            hidden_size,
            self.head_dim,
            self.total_num_heads,
            self.total_num_kv_heads,
            bias=qkv_bias,
            quant_config=quant_config,
            prefix=f"{prefix}.qkv_proj",
        )

        self.o_proj = RowParallelLinear(
            self.total_num_heads * self.head_dim,
            hidden_size,
            bias=False,
            quant_config=quant_config,
            prefix=f"{prefix}.o_proj",
        )

        t_rope = freq_allocation
        h_rope = (self.head_dim // 2 - freq_allocation) // 2
        w_rope = (self.head_dim // 2 - freq_allocation) // 2

        self.rotary_emb = Ernie4_5_VLRotaryEmbedding(
            head_size=self.head_dim,
            rotary_dim=self.head_dim,
            max_position_embeddings=max_position_embeddings,
            base=rope_parameters["rope_theta"],
            is_neox_style=False,
            dtype=torch.get_default_dtype(),
            mrope_section=[h_rope, w_rope, t_rope],
        )

        self.attn = Attention(
            self.num_heads,
            self.head_dim,
            self.scaling,
            num_kv_heads=self.num_kv_heads,
            cache_config=cache_config,
            quant_config=quant_config,
            prefix=f"{prefix}.attn",
        )

    def forward(
        self,
        positions: torch.Tensor,
        hidden_states: torch.Tensor,
    ) -> 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)

        # Attention
        attn_output = self.attn(q, k, v)
        # Output projection
        output, _ = self.o_proj(attn_output)
        return output


class Ernie4_5_VLMoeMoE(nn.Module):
    def __init__(
        self,
        config: PretrainedConfig,
        quant_config: QuantizationConfig | None = None,
        prefix: str = "",
    ):
        super().__init__()

        layer_idx = extract_layer_index(prefix)
        self.layer_idx = layer_idx
        self.tp_size = get_tensor_model_parallel_world_size()
        self.has_shared_experts = getattr(config, "moe_num_shared_experts", 0) > 0
        self.hidden_size = config.hidden_size

        moe_num_experts = config.moe_num_experts
        max_moe_num_experts = max(moe_num_experts)

        if self.tp_size > max_moe_num_experts:
            raise ValueError(
                f"Tensor parallel size {self.tp_size} is greater than "
                f"the number of experts {moe_num_experts}."
            )

        moe_layer_start_index = config.moe_layer_start_index
        text_moe_layer_start_index = moe_layer_start_index[0]
        vision_moe_layer_start_index = moe_layer_start_index[1]
        moe_layer_end_index = config.moe_layer_end_index
        moe_layer_end_index = getattr(
            config,
            "moe_layer_end_index",
            [config.num_hidden_layers - 1, config.num_hidden_layers - 1],
        )
        text_moe_layer_end_index = moe_layer_end_index[0]
        vision_moe_layer_end_index = moe_layer_end_index[1]

        assert config.moe_num_experts[0] == config.moe_num_experts[1]
        self.e_score_correction_bias = nn.Parameter(
            torch.empty(2, config.moe_num_experts[0], dtype=torch.float32)
        )

        assert text_moe_layer_start_index <= text_moe_layer_end_index

        if self.has_shared_experts:
            intermediate_size = (
                config.moe_intermediate_size[0] * config.moe_num_shared_experts
            )
            self.shared_experts = Ernie4_5_VLMoeMLP(
                hidden_size=config.hidden_size,
                intermediate_size=intermediate_size,
                hidden_act=config.hidden_act,
                quant_config=quant_config,
                prefix=f"{prefix}.shared_experts",
                reduce_results=False,
            )
        else:
            self.shared_experts = None

        if (
            layer_idx >= text_moe_layer_start_index
            and layer_idx <= text_moe_layer_end_index
        ):
            self.text_experts_gate = ReplicatedLinear(
                config.hidden_size,
                config.moe_num_experts[0],
                bias=False,
                params_dtype=torch.float32,
                quant_config=quant_config,
                prefix=f"{prefix}.text_experts_gate",
            )

            self.text_experts = SharedFusedMoE(
                shared_experts=self.shared_experts,
                num_experts=config.moe_num_experts[0],
                top_k=config.moe_k,
                hidden_size=config.hidden_size,
                intermediate_size=config.moe_intermediate_size[0],
                reduce_results=False,
                renormalize=True,
                quant_config=quant_config,
                e_score_correction_bias=self.e_score_correction_bias[0],
                prefix=f"{prefix}.text_experts",
                router_logits_dtype=torch.float32,
            )
        else:
            self.text_experts = Ernie4_5_VLMoeMLP(
                shared_experts=self.shared_experts,
                hidden_size=config.hidden_size,
                intermediate_size=config.intermediate_size,
                hidden_act=config.hidden_act,
                use_bias=getattr(config, "use_bias", False),
                quant_config=quant_config,
                prefix=f"{prefix}.mlp",
            )

        assert vision_moe_layer_start_index <= vision_moe_layer_end_index
        if (
            layer_idx >= vision_moe_layer_start_index
            and layer_idx <= vision_moe_layer_end_index
        ):
            self.vision_experts_gate = ReplicatedLinear(
                config.hidden_size,
                config.moe_num_experts[1],
                bias=False,
                params_dtype=torch.float32,
                quant_config=quant_config,
                prefix=f"{prefix}.vision_experts_gate",
            )

            self.vision_experts = SharedFusedMoE(
                shared_experts=self.shared_experts,
                num_experts=config.moe_num_experts[1],
                top_k=config.moe_k,
                hidden_size=config.hidden_size,
                intermediate_size=config.moe_intermediate_size[1],
                reduce_results=False,
                renormalize=True,
                quant_config=quant_config,
                e_score_correction_bias=self.e_score_correction_bias[1],
                prefix=f"{prefix}.vision_experts",
                router_logits_dtype=torch.float32,
            )
        else:
            self.vision_experts = Ernie4_5_VLMoeMLP(
                shared_experts=self.shared_experts,
                hidden_size=config.hidden_size,
                intermediate_size=config.intermediate_size,
                hidden_act=config.hidden_act,
                use_bias=getattr(config, "use_bias", False),
                quant_config=quant_config,
                prefix=f"{prefix}.mlp",
            )

    def forward(
        self,
        hidden_states: torch.Tensor,
        visual_token_mask: torch.Tensor,
        **kwargs: object,
    ) -> torch.Tensor:
        orig_shape = hidden_states.shape
        hidden_dim = hidden_states.shape[-1]
        hidden_states = hidden_states.view(-1, hidden_dim)

        if visual_token_mask is not None and visual_token_mask.all():
            # only vision modal input
            router_logits, _ = self.vision_experts_gate(
                hidden_states.to(dtype=torch.float32)
            )
            final_hidden_states = self.vision_experts(
                hidden_states=hidden_states, router_logits=router_logits
            )
        elif visual_token_mask is not None and visual_token_mask.any():
            # text and vision modals input
            visual_token_mask = visual_token_mask.repeat(1, self.hidden_size).bool()
            text_token_mask = ~visual_token_mask
            final_experts_hidden_states = torch.zeros_like(hidden_states)
            final_shared_ouput = (
                torch.zeros_like(hidden_states) if self.has_shared_experts else None
            )

            text_hidden_states = hidden_states[text_token_mask].reshape(
                -1, self.hidden_size
            )
            vision_hidden_states = hidden_states[visual_token_mask].reshape(
                -1, self.hidden_size
            )

            text_router_logits, _ = self.text_experts_gate(
                text_hidden_states.to(dtype=torch.float32)
            )
            text_shared_ouput, text_experts_output = self.text_experts(
                hidden_states=text_hidden_states, router_logits=text_router_logits
            )
            final_experts_hidden_states[text_token_mask] = text_experts_output.flatten()
            if self.has_shared_experts:
                final_shared_ouput[text_token_mask] = text_shared_ouput.flatten()

            vision_router_logits, _ = self.vision_experts_gate(
                vision_hidden_states.to(dtype=torch.float32)
            )
            vision_shared_ouput, vision_experts_output = self.vision_experts(
                hidden_states=vision_hidden_states, router_logits=vision_router_logits
            )
            final_experts_hidden_states[visual_token_mask] = (
                vision_experts_output.flatten()
            )
            if self.has_shared_experts:
                final_shared_ouput[visual_token_mask] = vision_shared_ouput.flatten()

            final_hidden_states = (final_shared_ouput, final_experts_hidden_states)
        else:
            # only text modal input
            text_router_logits, _ = self.text_experts_gate(
                hidden_states.to(dtype=torch.float32)
            )

            final_hidden_states = self.text_experts(
                hidden_states=hidden_states, router_logits=text_router_logits
            )

        if self.has_shared_experts:
            # for shared_experts model
            final_hidden_states = final_hidden_states[0] + final_hidden_states[1]
        else:
            # for not shared_experts model
            final_hidden_states = final_hidden_states[1]

        if self.tp_size > 1:
            final_hidden_states = (
                self.text_experts.maybe_all_reduce_tensor_model_parallel(
                    final_hidden_states
                )
            )

        return final_hidden_states.view(orig_shape)


class Ernie4_5_VLMoeDecoderLayer(nn.Module):
    def __init__(
        self,
        config: PretrainedConfig,
        cache_config: CacheConfig | None = None,
        quant_config: QuantizationConfig | None = None,
        prefix: str = "",
    ) -> None:
        super().__init__()
        self.hidden_size = config.hidden_size
        set_default_rope_theta(config, default_theta=500000)
        freq_allocation = getattr(config, "freq_allocation", 20)
        max_position_embeddings = getattr(config, "max_position_embeddings", 131072)

        self.self_attn = Ernie4_5_VLMoeAttention(
            hidden_size=self.hidden_size,
            num_heads=config.num_attention_heads,
            num_kv_heads=config.num_key_value_heads,
            head_dim=getattr(config, "head_dim", None),
            rope_parameters=config.rope_parameters,
            freq_allocation=freq_allocation,
            max_position_embeddings=max_position_embeddings,
            rms_norm_eps=config.rms_norm_eps,
            qkv_bias=getattr(config, "use_bias", False),
            cache_config=cache_config,
            quant_config=quant_config,
            prefix=f"{prefix}.self_attn",
        )

        layer_idx = extract_layer_index(prefix)
        self.layer_idx = layer_idx

        # MoE
        moe_layer_start_index = config.moe_layer_start_index
        min_moe_layer_start_index = min(moe_layer_start_index)
        moe_layer_end_index = getattr(
            config,
            "moe_layer_end_index",
            [config.num_hidden_layers - 1, config.num_hidden_layers - 1],
        )
        max_moe_layer_end_index = max(moe_layer_end_index)
        assert min_moe_layer_start_index <= max_moe_layer_end_index
        moe_num_experts = config.moe_num_experts
        max_moe_num_experts = max(moe_num_experts)
        moe_layer_interval = getattr(config, "moe_layer_interval", 1)
        use_moe = getattr(config, "use_moe", max_moe_num_experts > 0)

        if (
            use_moe
            and ((layer_idx + 1) % moe_layer_interval == 0)
            and layer_idx >= min_moe_layer_start_index
            and layer_idx <= max_moe_layer_end_index
        ):
            self.mlp = Ernie4_5_VLMoeMoE(
                config=config, quant_config=quant_config, prefix=f"{prefix}.mlp"
            )
        else:
            self.mlp = Ernie4_5_VLMoeMLP(
                hidden_size=config.hidden_size,
                intermediate_size=config.intermediate_size,
                hidden_act=config.hidden_act,
                use_bias=getattr(config, "use_bias", False),
                quant_config=quant_config,
                prefix=f"{prefix}.mlp",
            )

        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,
        residual: torch.Tensor | None,
        visual_token_mask: torch.Tensor | None,
        **kwargs: object,
    ) -> 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,
        )

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

        if isinstance(self.mlp, Ernie4_5_VLMoeMoE):
            hidden_states = self.mlp(hidden_states, visual_token_mask, **kwargs)
        else:
            hidden_states = self.mlp(hidden_states)

        return hidden_states, residual


# Since Ernie VL distinguishes between text experts and vision experts,
# enabling torch.compile will cause errors.
# @support_torch_compile(
#     dynamic_arg_dims={
#         "input_ids": 0,
#         "positions": -1,
#         "intermediate_tensors": 0,
#         "inputs_embeds": 0,
#         "visual_token_mask": 0,
#     })
class Ernie4_5_VLMoeModel(nn.Module):
    def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""):
        super().__init__()

        config = vllm_config.model_config.hf_config
        cache_config = vllm_config.cache_config
        quant_config = vllm_config.quant_config

        self.vocab_size = config.vocab_size
        self.config = config

        self.im_patch_id = config.im_patch_id

        if get_pp_group().is_first_rank:
            self.embed_tokens = VocabParallelEmbedding(
                config.vocab_size,
                config.hidden_size,
                quant_config=quant_config,
                prefix=f"{prefix}.embed_tokens",
            )
        else:
            self.embed_tokens = PPMissingLayer()

        self.start_layer, self.end_layer, self.layers = make_layers(
            config.num_hidden_layers,
            lambda prefix: Ernie4_5_VLMoeDecoderLayer(
                config=config,
                cache_config=cache_config,
                quant_config=quant_config,
                prefix=prefix,
            ),
            prefix=f"{prefix}.layers",
        )

        if get_pp_group().is_last_rank:
            self.norm = RMSNorm(config.hidden_size, eps=config.rms_norm_eps)
        else:
            self.norm = PPMissingLayer()

        self.make_empty_intermediate_tensors = make_empty_intermediate_tensors_factory(
            ["hidden_states", "residual"], config.hidden_size
        )

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

    def forward(
        self,
        input_ids: torch.Tensor | None,
        positions: torch.Tensor,
        intermediate_tensors: IntermediateTensors | None = None,
        inputs_embeds: torch.Tensor | None = None,
        visual_token_mask: torch.Tensor | None = None,
        **kwargs: object,
    ) -> torch.Tensor | IntermediateTensors:
        if get_pp_group().is_first_rank:
            if inputs_embeds is not None:
                hidden_states = inputs_embeds
            else:
                hidden_states = self.embed_input_ids(input_ids)
            residual = None
        else:
            assert intermediate_tensors is not None
            hidden_states = intermediate_tensors["hidden_states"]
            residual = intermediate_tensors["residual"]

        for layer in islice(self.layers, self.start_layer, self.end_layer):
            hidden_states, residual = layer(
                positions, hidden_states, residual, visual_token_mask, **kwargs
            )

        if not get_pp_group().is_last_rank:
            return IntermediateTensors(
                {"hidden_states": hidden_states, "residual": residual}
            )

        hidden_states, _ = self.norm(hidden_states, residual)

        return hidden_states


# only used as text backbone for ernie4.5-vl
class Ernie4_5_VLMoeForCausalLM(nn.Module, SupportsPP):
    packed_modules_mapping = {
        "qkv_proj": [
            "q_proj",
            "k_proj",
            "v_proj",
        ],
        "gate_up_proj": [
            "gate_proj",
            "up_proj",
        ],
    }

    fall_back_to_pt_during_load = False

    def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""):
        super().__init__()
        config = vllm_config.model_config.hf_config
        quant_config = vllm_config.quant_config
        self.config = config
        self.quant_config = quant_config
        self.model = Ernie4_5_VLMoeModel(
            vllm_config=vllm_config, prefix=maybe_prefix(prefix, "model")
        )

        if get_pp_group().is_last_rank:
            self.lm_head = ParallelLMHead(
                config.vocab_size,
                config.hidden_size,
                quant_config=quant_config,
                prefix=maybe_prefix(prefix, "lm_head"),
            )
        else:
            self.lm_head = PPMissingLayer()

        if self.config.tie_word_embeddings:
            self.lm_head.weight = self.model.embed_tokens.weight
        self.logits_processor = LogitsProcessor(config.vocab_size)
        self.make_empty_intermediate_tensors = (
            self.model.make_empty_intermediate_tensors
        )

    def embed_input_ids(self, input_ids: torch.Tensor) -> torch.Tensor:
        return self.model.embed_input_ids(input_ids)

    def forward(
        self,
        input_ids: torch.Tensor | None,
        positions: torch.Tensor,
        intermediate_tensors: IntermediateTensors | None = None,
        inputs_embeds: torch.Tensor | None = None,
        **kwargs: object,
    ) -> torch.Tensor | IntermediateTensors:
        hidden_states = self.model(
            input_ids, positions, intermediate_tensors, inputs_embeds, **kwargs
        )
        return hidden_states

    def compute_logits(
        self,
        hidden_states: torch.Tensor,
    ) -> torch.Tensor | None:
        logits = self.logits_processor(self.lm_head, hidden_states)
        return logits

    def load_weights(self, weights: Iterable[tuple[str, torch.Tensor]]) -> set[str]:
        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),
        ]

        # Params for weights, fp8 weight scales, fp8 activation scales
        # (param_name, weight_name, expert_id, shard_id)
        expert_params_mapping = SharedFusedMoE.make_expert_params_mapping(
            self,
            ckpt_gate_proj_name="gate_proj",
            ckpt_down_proj_name="down_proj",
            ckpt_up_proj_name="up_proj",
            num_experts=max(self.config.moe_num_experts),
        )

        params_dict = dict(self.named_parameters())
        loaded_params: set[str] = set()
        for name, loaded_weight in weights:
            if self.config.tie_word_embeddings and name.endswith("lm_head.weight"):
                loaded_params.add("lm_head.weight")
                continue
            # MTP will be supported soon.
            if "mtp" in name or "vision_model" in name or "resampler_model" in name:
                continue

            for param_name, weight_name, shard_id in stacked_params_mapping:
                # Skip non-stacked layers and experts (experts handled below).
                if weight_name not in name:
                    continue

                if ("mlp.experts." in name) and name not in params_dict:
                    continue
                name = name.replace(weight_name, param_name)
                # Skip loading extra bias for GPTQ models.
                if (
                    name.endswith(".bias") or name.endswith("_bias")
                ) and name not in params_dict:
                    continue
                # Skip layers on other devices.
                if is_pp_missing_parameter(name, self):
                    continue

                param = params_dict[name]
                weight_loader = param.weight_loader
                weight_loader(param, loaded_weight, shard_id)
                break
            else:
                # Distinguish between vision experts and text experts
                if "mlp.experts" in name:
                    moe_offset = int(name.split(".")[-3])
                    vision_expert_start_idx = self.config.moe_num_experts[0]
                    is_text_expert = moe_offset <= vision_expert_start_idx - 1
                    if is_text_expert:
                        name = name.replace(".experts.", ".text_experts.")
                    else:
                        name = name.replace(
                            f".experts.{moe_offset}",
                            f".vision_experts.{moe_offset - vision_expert_start_idx}",
                        )

                for mapping in expert_params_mapping:
                    param_name, weight_name, expert_id, shard_id = mapping

                    if weight_name not in name:
                        continue

                    # Distinguish between vision experts and text experts
                    moe_offset = int(name.split(".")[-3])
                    is_text_expert = moe_offset <= self.config.moe_num_experts[0] - 1

                    name = name.replace(weight_name, param_name)
                    if is_text_expert:
                        name = name.replace(".experts.", ".text_experts.")
                    else:
                        name = name.replace(".experts.", ".vision_experts.")

                    # Skip layers on other devices.
                    if is_pp_missing_parameter(name, self):
                        continue

                    # Skip loading extra bias for GPTQ models.
                    if (
                        name.endswith(".bias") or name.endswith("_bias")
                    ) and name not in params_dict:
                        continue
                    param = params_dict[name]

                    weight_loader = param.weight_loader
                    weight_loader(
                        param,
                        loaded_weight,
                        name,
                        shard_id=shard_id,
                        expert_id=expert_id,
                    )
                    break
                else:
                    # Distinguish between vision expert gate
                    # and text expert gate
                    if name.endswith("mlp.gate.weight"):
                        name = name.replace("gate.weight", "text_experts_gate.weight")
                        loaded_weight = loaded_weight.T
                    elif name.endswith("mlp.gate.weight_1"):
                        name = name.replace(
                            "gate.weight_1", "vision_experts_gate.weight"
                        )
                        loaded_weight = loaded_weight.T

                    if "e_score_correction_bias" in name:
                        name = name.replace(".moe_statics.", ".")

                    # Skip loading extra bias for GPTQ models.
                    if (
                        name.endswith(".bias") or name.endswith("_bias")
                    ) and name not in params_dict:
                        continue
                    # Skip layers on other devices.
                    if is_pp_missing_parameter(name, self):
                        continue
                    # Remapping the name of FP8 kv-scale.
                    name = maybe_remap_kv_scale_name(name, params_dict)
                    if name is None:
                        continue

                    param = params_dict[name]

                    weight_loader = getattr(
                        param, "weight_loader", default_weight_loader
                    )
                    weight_loader(param, loaded_weight)
            loaded_params.add(name)
        return loaded_params