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[https://nvbugs/5676748][fix] Fix mismatched nvfp4 gemm sf shape. #9336

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Merged
QiJune merged 1 commit into from
Nov 24, 2025
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[https://nvbugs/5676748][fix] Fix mismatched nvfp4 gemm sf shape. #9336

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6 changes: 3 additions & 3 deletions tensorrt_llm/_torch/attention_backend/trtllm.py
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Original file line number Diff line number Diff line change
Expand Up @@ -329,9 +329,9 @@ def create_output(self, q: torch.Tensor, out_dtype: torch.dtype):
size_per_token // num_nvfp4_elements_per_container),
dtype=torch.uint8)
# Create a sf (scaling factors) tensor for NVFP4 (use INT8 as the container dtype).
output_sf = q.new_empty(compute_swizzled_sf_shape(
num_tokens, size_per_token // scaling_vector_size),
dtype=torch.uint8)
padded_row, padded_col = compute_swizzled_sf_shape(
num_tokens, size_per_token // scaling_vector_size)
output_sf = q.new_empty(padded_row * padded_col, dtype=torch.uint8)
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else:
output = q.new_empty((num_tokens, self.num_heads * v_head_size),
dtype=out_dtype)
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