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sglang/python/sglang/srt/models/ernie4_eagle.py
2025-08-08 00:55:48 -07:00

204 lines
7.1 KiB
Python

# Copyright 2023-2025 SGLang Team
# 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.
# ==============================================================================
""" Ernie4.5 MTP model compatible with baidu/ERNIE-4.5-*-PT weights. """
from typing import Iterable, Optional, Tuple
import torch
from torch import nn
from transformers.models.ernie4_5_moe.configuration_ernie4_5_moe import (
Ernie4_5_MoeConfig,
)
from sglang.srt.layers.layernorm import RMSNorm
from sglang.srt.layers.logits_processor import LogitsProcessor
from sglang.srt.layers.quantization.base_config import QuantizationConfig
from sglang.srt.layers.vocab_parallel_embedding import (
ParallelLMHead,
VocabParallelEmbedding,
)
from sglang.srt.model_executor.forward_batch_info import ForwardBatch
from sglang.srt.model_loader.weight_utils import default_weight_loader
from sglang.srt.models.ernie4 import Ernie4_5_ForCausalLM, Ernie4DecoderLayer
from sglang.srt.utils import add_prefix
class Ernie4ModelMTP(nn.Module):
def __init__(
self,
config: Ernie4_5_MoeConfig,
layer_id: int,
prefix: str,
quant_config: Optional[QuantizationConfig] = None,
) -> None:
super().__init__()
self.embed_tokens = VocabParallelEmbedding(
config.vocab_size,
config.hidden_size,
quant_config=quant_config,
prefix=add_prefix("embed_tokens", prefix),
)
self.mtp_emb_norm = RMSNorm(config.hidden_size, eps=config.rms_norm_eps)
self.mtp_hidden_norm = RMSNorm(config.hidden_size, eps=config.rms_norm_eps)
self.mtp_linear_proj = nn.Linear(
config.hidden_size * 2, config.hidden_size, bias=config.use_bias
)
self.mtp_block = Ernie4DecoderLayer(
config=config,
layer_id=layer_id,
quant_config=quant_config,
prefix=add_prefix("mtp_block", prefix),
is_mtp=True,
)
def forward(
self,
input_ids: torch.Tensor,
positions: torch.Tensor,
forward_batch: ForwardBatch,
input_embeds: torch.Tensor = None,
) -> torch.Tensor:
if input_embeds is None:
hidden_states = self.embed_tokens(input_ids)
else:
hidden_states = input_embeds
# masking inputs at position 0, as not needed by MTP
hidden_states[positions == 0] = 0
hidden_states = self.mtp_linear_proj(
torch.cat(
(
self.mtp_emb_norm(hidden_states),
self.mtp_hidden_norm(forward_batch.spec_info.hidden_states),
),
dim=-1,
)
)
residual = None
hidden_states, residual = self.mtp_block(
positions=positions,
hidden_states=hidden_states,
forward_batch=forward_batch,
residual=residual,
)
hidden_states = residual + hidden_states
return hidden_states
class Ernie4_5_MoeForCausalLMMTP(nn.Module):
def __init__(
self,
config: Ernie4_5_MoeConfig,
quant_config: Optional[QuantizationConfig] = None,
prefix: str = "",
mtp_layer_id: int = 0,
) -> None:
nn.Module.__init__(self)
self.config = config
self.mtp_layer_id = mtp_layer_id
self.model = Ernie4ModelMTP(
config=config,
layer_id=self.mtp_layer_id,
quant_config=quant_config,
prefix=add_prefix("model", prefix),
)
if config.tie_word_embeddings:
self.lm_head = self.model.embed_tokens
else:
self.lm_head = ParallelLMHead(
config.vocab_size,
config.hidden_size,
quant_config=quant_config,
prefix="lm_head",
)
self.logits_processor = LogitsProcessor(config)
@torch.no_grad()
def forward(
self,
input_ids: torch.Tensor,
positions: torch.Tensor,
forward_batch: ForwardBatch,
) -> torch.Tensor:
hidden_states = self.model(input_ids, positions, forward_batch)
return self.logits_processor(
input_ids, hidden_states, self.lm_head, forward_batch
)
def load_weights(self, weights: Iterable[Tuple[str, torch.Tensor]]):
mtp_layer_found = False
mtp_weight_patterns = [
f"mtp_block.{self.mtp_layer_id}",
f"mtp_emb_norm.{self.mtp_layer_id}",
f"mtp_hidden_norm.{self.mtp_layer_id}",
f"mtp_linear_proj.{self.mtp_layer_id}",
]
params_dict = dict(self.named_parameters())
for name, loaded_weight in weights:
# Only name matched patterns should be loaded
for layer_pattern in mtp_weight_patterns:
if layer_pattern in name:
mtp_layer_found = True
break
else:
continue
# But strip mtp_layer_id before loading, because each MTP layer is a MTP model.
name = name.replace(f".{self.mtp_layer_id}.", ".")
for (
param_name,
weight_name,
shard_id,
) in Ernie4_5_ForCausalLM.stacked_params_mapping:
if weight_name not in name:
continue
name = name.replace(weight_name, param_name)
param = params_dict[name]
weight_loader = param.weight_loader
weight_loader(param, loaded_weight, shard_id)
break
else:
if name in params_dict.keys():
param = params_dict[name]
weight_loader = getattr(
param, "weight_loader", default_weight_loader
)
weight_loader(param, loaded_weight)
else:
raise KeyError(f"Parameter '{name}' not found in MTP model.")
if not mtp_layer_found:
raise KeyError(
f"MTP layers 'mtp_*.{self.mtp_layer_id}.*' not found in weights."
)
def get_embed_and_head(self):
return self.model.embed_tokens.weight, self.lm_head.weight
def set_embed_and_head(self, embed, head):
del self.model.embed_tokens.weight
self.model.embed_tokens.weight = embed
if self.config.tie_word_embeddings:
self.lm_head = self.model.embed_tokens
else:
del self.lm_head.weight
self.lm_head.weight = head
torch.cuda.empty_cache()
torch.cuda.synchronize()
EntryClass = [Ernie4_5_MoeForCausalLMMTP]