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[Kernel] Support sliding window in flash attention backend (#9403)

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This commit is contained in:
Chen Zhang
2024-10-20 10:57:52 -07:00
committed by GitHub
parent 962d2c6349
commit 4fa3e33349
13 changed files with 41 additions and 61 deletions
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35
tests/kernels/test_attention_selector.py
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@@ -20,21 +20,21 @@ def test_env(name: str, device: str, monkeypatch):
if device == "cpu":
with patch("vllm.attention.selector.is_cpu", return_value=True):
backend = which_attn_to_use(16, None, torch.float16, torch.float16,
16, False)
backend = which_attn_to_use(16, torch.float16, torch.float16, 16,
False)
assert backend.name == "TORCH_SDPA"
elif device == "hip":
with patch("vllm.attention.selector.is_hip", return_value=True):
backend = which_attn_to_use(16, None, torch.float16, torch.float16,
16, False)
backend = which_attn_to_use(16, torch.float16, torch.float16, 16,
False)
assert backend.name == "ROCM_FLASH"
elif device == "openvino":
with patch("vllm.attention.selector.is_openvino", return_value=True):
backend = which_attn_to_use(16, None, torch.float16, torch.float16,
16, False)
backend = which_attn_to_use(16, torch.float16, torch.float16, 16,
False)
assert backend.name == "OPENVINO"
else:
backend = which_attn_to_use(16, None, torch.float16, torch.float16, 16,
backend = which_attn_to_use(16, torch.float16, torch.float16, 16,
False)
assert backend.name == name
@@ -46,37 +46,32 @@ def test_flash_attn(monkeypatch):
# Unsupported CUDA arch
with patch("torch.cuda.get_device_capability", return_value=(7, 5)):
backend = which_attn_to_use(16, None, torch.float16, None, 16, False)
backend = which_attn_to_use(16, torch.float16, None, 16, False)
assert backend.name != STR_FLASH_ATTN_VAL
# Unsupported data type
backend = which_attn_to_use(16, None, torch.float8_e4m3fn, None, 16, False)
backend = which_attn_to_use(16, torch.float8_e4m3fn, None, 16, False)
assert backend.name != STR_FLASH_ATTN_VAL
# Unsupported kv cache data type
backend = which_attn_to_use(16, None, torch.float16, "fp8", 16, False)
backend = which_attn_to_use(16, torch.float16, "fp8", 16, False)
assert backend.name != STR_FLASH_ATTN_VAL
# Unsupported block size
backend = which_attn_to_use(16, None, torch.float16, None, 8, False)
assert backend.name != STR_FLASH_ATTN_VAL
# Unsupported sliding window
backend = which_attn_to_use(16, 1, torch.float16, None, 16, False)
backend = which_attn_to_use(16, torch.float16, None, 8, False)
assert backend.name != STR_FLASH_ATTN_VAL
# flash-attn is not installed
with patch.dict('sys.modules', {'vllm_flash_attn': None}):
backend = which_attn_to_use(16, None, torch.float16, None, 16, False)
backend = which_attn_to_use(16, torch.float16, None, 16, False)
assert backend.name != STR_FLASH_ATTN_VAL
# Unsupported head size
backend = which_attn_to_use(17, None, torch.float16, None, 16, False)
backend = which_attn_to_use(17, torch.float16, None, 16, False)
assert backend.name != STR_FLASH_ATTN_VAL
# Attention-free models should bypass env and use PlaceholderAttention
backend = which_attn_to_use(16, None, torch.float16, torch.float16, 16,
True)
backend = which_attn_to_use(16, torch.float16, torch.float16, 16, True)
assert backend.name != STR_FLASH_ATTN_VAL
@@ -84,4 +79,4 @@ def test_invalid_env(monkeypatch):
"""Throw an exception if the backend name is invalid."""
override_backend_env_variable(monkeypatch, STR_INVALID_VAL)
with pytest.raises(ValueError):
which_attn_to_use(16, None, torch.float16, None, 16, False)
which_attn_to_use(16, torch.float16, None, 16, False)