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[Kernel] Fix input for flashinfer prefill wrapper. (#7008)

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Lily Liu 2024-08-01 18:44:16 -07:00 committed by GitHub
parent 6ce01f3066
commit 954f7305a1
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1 changed files with 9 additions and 2 deletions
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11
vllm/attention/backends/flashinfer.py
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@ -133,13 +133,20 @@ class FlashInferMetadata(AttentionMetadata):
return
assert self.prefill_wrapper is not None
assert self.query_start_loc is not None
assert self.paged_kv_indices is not None
assert self.paged_kv_indptr is not None
assert self.paged_kv_last_page_len is not None
self.paged_kv_indices = self.paged_kv_indices.to(self.device)
self.paged_kv_indptr = self.paged_kv_indptr.to(self.device)
batch_size = self.query_start_loc.shape[0] - 1
assert batch_size >= 0
# The prefill stage does not read kv cache.
# Both paged_kv_indices and paged_kv_last_page_len are empty.
# paged_kv_indptr is a zero tensor with size batch_size + 1.
self.paged_kv_indptr = torch.zeros(batch_size + 1,
device=self.device)
self.paged_kv_last_page_len = self.paged_kv_last_page_len.to(
self.device)
self.paged_kv_indices = self.paged_kv_indices.to(self.device)
self.prefill_wrapper.end_forward()
self.prefill_wrapper.begin_forward(
self.query_start_loc, self.paged_kv_indptr,