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[Bugfix] Keep all tensors to be on the same device #31958

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[Bugfix] Keep all tensors to be on the same device #31958

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2 changes: 1 addition & 1 deletion vllm/v1/attention/backends/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -136,7 +136,7 @@ def compute_num_computed_tokens(self) -> torch.Tensor:
"""Compute num_computed_tokens on device (seq_lens - query_lens)."""
if self._num_computed_tokens_cache is None:
query_lens = self.query_start_loc[1:] - self.query_start_loc[:-1]
self._num_computed_tokens_cache = self.seq_lens - query_lens
self._num_computed_tokens_cache = self.seq_lens.cpu() - query_lens.cpu()
return self._num_computed_tokens_cache

# TODO(lucas): remove once we have FULL-CG spec-decode support
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