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skip flash block sizes setting for cross attention. #247

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skip flash block sizes setting for cross attention. #247

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16 changes: 8 additions & 8 deletions src/maxdiffusion/max_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -495,14 +495,14 @@ def get_flash_block_sizes(config):
flash_block_sizes = None
if len(config.flash_block_sizes.keys()) > 0:
flash_block_sizes = splash_attention_kernel.BlockSizes(
block_q=config.flash_block_sizes["block_q"],
block_kv_compute=config.flash_block_sizes["block_kv_compute"],
block_kv=config.flash_block_sizes["block_kv"],
block_q_dkv=config.flash_block_sizes["block_q_dkv"],
block_kv_dkv=config.flash_block_sizes["block_kv_dkv"],
block_kv_dkv_compute=config.flash_block_sizes["block_kv_dkv_compute"],
block_q_dq=config.flash_block_sizes["block_q_dq"],
block_kv_dq=config.flash_block_sizes["block_kv_dq"],
block_q=int(config.flash_block_sizes["block_q"]),
block_kv_compute=int(config.flash_block_sizes["block_kv_compute"]),
block_kv=int(config.flash_block_sizes["block_kv"]),
block_q_dkv=int(config.flash_block_sizes["block_q_dkv"]),
block_kv_dkv=int(config.flash_block_sizes["block_kv_dkv"]),
block_kv_dkv_compute=int(config.flash_block_sizes["block_kv_dkv_compute"]),
block_q_dq=int(config.flash_block_sizes["block_q_dq"]),
block_kv_dq=int(config.flash_block_sizes["block_kv_dq"]),
)
return flash_block_sizes

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3 changes: 2 additions & 1 deletion src/maxdiffusion/models/attention_flax.py
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Original file line number Diff line number Diff line change
Expand Up @@ -184,7 +184,8 @@ def _tpu_flash_attention(
kv_max_block_size = key.shape[1]
else:
kv_max_block_size = q_max_block_size
if flash_block_sizes:
# ensure that for cross attention we override the block sizes.
if flash_block_sizes and key.shape[1] == query.shape[1]:
block_sizes = flash_block_sizes
else:
block_sizes = splash_attention_kernel.BlockSizes(
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