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[ROCm] Support for Whisper v1 with Aiter Unified Attention and Aiter Flash Attention (#28376)

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Signed-off-by: apinge <Tong.Qiu2@amd.com>
This commit is contained in:
tongqiu
2025-11-24 11:26:00 +08:00
committed by GitHub
parent 30854783ad
commit 5253f4276f
3 changed files with 28 additions and 15 deletions
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22
vllm/v1/attention/backends/rocm_aiter_fa.py
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@@ -517,12 +517,9 @@ class AiterFlashAttentionImpl(AttentionImpl):
assert self.num_heads % self.num_kv_heads == 0
self.num_queries_per_kv = self.num_heads // self.num_kv_heads
if attn_type != AttentionType.DECODER:
if attn_type not in [AttentionType.DECODER, AttentionType.ENCODER_DECODER]:
raise NotImplementedError(
"Encoder self-attention and "
"encoder/decoder cross-attention "
"are not implemented for "
"FlashAttentionImpl"
"Encoder self-attention is not implemented for FlashAttentionImpl"
)
def extend_forward(
@@ -678,7 +675,14 @@ class AiterFlashAttentionImpl(AttentionImpl):
# performance to make sure it does not introduce any overhead.
num_actual_tokens = attn_metadata.num_actual_tokens
key_cache, value_cache = kv_cache.unbind(0)
if self.kv_sharing_target_layer_name is None:
# key and value may be None in the case of cross attention. They are
# calculated once based on the output from the encoder and then cached
# in KV cache.
if (
self.kv_sharing_target_layer_name is None
and key is not None
and value is not None
):
# Reshape the input keys and values and store them in the cache.
# Skip this if sharing KV cache with an earlier attention layer.
# NOTE(woosuk): Here, key and value are padded while slot_mapping
@@ -704,8 +708,10 @@ class AiterFlashAttentionImpl(AttentionImpl):
# decode:extend:prefill
query = query[:num_actual_tokens]
key = key[:num_actual_tokens]
value = value[:num_actual_tokens]
if key is not None:
key = key[:num_actual_tokens]
if value is not None:
value = value[:num_actual_tokens]
output_actual_tokens = output[:num_actual_tokens]