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[Bugfix] Fix illegal memory access in FP8 MoE kernel #6382

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merged 1 commit into from
Jul 12, 2024
Merged

[Bugfix] Fix illegal memory access in FP8 MoE kernel #6382

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8 changes: 5 additions & 3 deletions vllm/model_executor/layers/fused_moe/fused_moe.py
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Original file line number Diff line number Diff line change
Expand Up @@ -492,12 +492,14 @@ def fused_experts(hidden_states: torch.Tensor,
if tokens_in_chunk == 0:
break

if tokens_in_chunk < CHUNK_SIZE:
# will only happen in the last chunk
if tokens_in_chunk < CHUNK_SIZE and chunk > 0:
# Adjust the intermediate cache size and config for the last
# chunk. Note that in most cases we only have one chunk
# so the cache size and config are already set correctly and
# do not need to be adjusted.
intermediate_cache1 = intermediate_cache1[:tokens_in_chunk]
intermediate_cache2 = intermediate_cache2[:tokens_in_chunk]
intermediate_cache3 = intermediate_cache3[:tokens_in_chunk]
# reload config to get better performance on the last chunk
config = get_config_func(tokens_in_chunk)

curr_topk_ids = topk_ids[begin_chunk_idx:end_chunk_idx]
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