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Fix for breaking changes in xformers 0.0.21 (#834)

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Woosuk Kwon 2023-08-23 17:44:21 +09:00 committed by GitHub
parent 85ebcda94d
commit 2a4ec90854
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2 changed files with 4 additions and 3 deletions
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2
requirements.txt
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@ -5,7 +5,7 @@ sentencepiece # Required for LLaMA tokenizer.
numpy
torch >= 2.0.0
transformers >= 4.31.0 # Required for LLaMA-2.
xformers >= 0.0.19
xformers >= 0.0.21
fastapi
uvicorn
pydantic < 2 # Required for OpenAI server.

5
vllm/model_executor/layers/attention.py
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@ -357,11 +357,12 @@ class PagedAttentionWithALiBi(PagedAttention):
# be sliced from a tensor whose length is a multiple of 8.
padded_len = (prompt_len + 7) // 8 * 8
bias = torch.empty(
1, # batch_size
self.num_heads,
padded_len,
prompt_len,
padded_len,
device=self.alibi_slopes.device,
)[:, :prompt_len, :prompt_len].copy_(bias)
)[:, :, :, :prompt_len].copy_(bias)
bias.mul_(self.alibi_slopes[:, None, None])
attn_bias = LowerTriangularMaskWithTensorBias(bias)
input_metadata.attn_bias.append(attn_bias)