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Fix DeepSeek bug causing 2.2% MMLU drop when TP!=DP (#4883)

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Co-authored-by: ch-wan <cwan39@gatech.edu>
This commit is contained in:
fzyzcjy
2025-03-31 11:10:21 +08:00
committed by GitHub
parent 42873eac09
commit a303325fdb
1 changed files with 10 additions and 25 deletions
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35
python/sglang/srt/models/deepseek_v2.py
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@@ -1102,6 +1102,10 @@ class DeepseekV2DecoderLayer(nn.Module):
else:
hidden_states, residual = self.input_layernorm(hidden_states, residual)
assert not (
self.attn_tp_size != 1 and self.input_is_scattered
), "moe_layer_freq > 1 is not supported when attn_tp_size > 1"
# Self Attention
hidden_states = self.self_attn(
positions=positions,
@@ -1109,22 +1113,6 @@ class DeepseekV2DecoderLayer(nn.Module):
forward_batch=forward_batch,
)
if self.attn_tp_size != 1 and self.input_is_scattered:
hidden_states, local_hidden_states = (
forward_batch.gathered_buffer[: forward_batch.input_ids.shape[0]],
hidden_states,
)
tp_all_gather(
list(hidden_states.tensor_split(self.attn_tp_size)), local_hidden_states
)
residual, local_residual = (
forward_batch.gathered_buffer[: forward_batch.input_ids.shape[0]],
residual,
)
tp_all_gather(
list(residual.tensor_split(self.attn_tp_size)), local_residual
)
# Gather
if get_tensor_model_parallel_world_size() > 1:
# all gather and all reduce
@@ -1223,6 +1211,8 @@ class DeepseekV2DecoderLayer(nn.Module):
hidden_states = self.mlp(hidden_states, forward_batch.forward_mode)
if self.is_last_layer and self.attn_tp_size != 1:
hidden_states += residual
residual = None
hidden_states, local_hidden_states = (
forward_batch.gathered_buffer[: forward_batch.input_ids.shape[0]],
hidden_states,
@@ -1230,19 +1220,11 @@ class DeepseekV2DecoderLayer(nn.Module):
tp_all_gather(
list(hidden_states.tensor_split(self.attn_tp_size)), local_hidden_states
)
residual, local_residual = (
forward_batch.gathered_buffer[: forward_batch.input_ids.shape[0]],
residual,
)
tp_all_gather(
list(residual.tensor_split(self.attn_tp_size)), local_residual
)
return hidden_states, residual
class DeepseekV2Model(nn.Module):
fall_back_to_pt_during_load = False
def __init__(
@@ -1296,7 +1278,10 @@ class DeepseekV2Model(nn.Module):
positions, hidden_states, forward_batch, residual
)
if not forward_batch.forward_mode.is_idle():
hidden_states, _ = self.norm(hidden_states, residual)
if residual is None:
hidden_states = self.norm(hidden_states)
else:
hidden_states, _ = self.norm(hidden_states, residual)
return hidden_states