83 lines
3.2 KiB
Python
83 lines
3.2 KiB
Python
from unittest.mock import patch
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import pytest
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import torch
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from tests.kernels.utils import override_backend_env_variable
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from vllm.attention.selector import which_attn_to_use
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from vllm.utils import STR_FLASH_ATTN_VAL, STR_INVALID_VAL
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@pytest.mark.parametrize(
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"name", ["TORCH_SDPA", "ROCM_FLASH", "XFORMERS", "FLASHINFER", "OPENVINO"])
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@pytest.mark.parametrize("device", ["cpu", "openvino", "hip", "cuda"])
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def test_env(name: str, device: str, monkeypatch):
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"""Test that the attention selector can be set via environment variable.
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Note that we do not test FlashAttn because it is the default backend.
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"""
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override_backend_env_variable(monkeypatch, name)
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if device == "cpu":
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with patch("vllm.attention.selector.is_cpu", return_value=True):
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backend = which_attn_to_use(16, torch.float16, torch.float16, 16,
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False)
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assert backend.name == "TORCH_SDPA"
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elif device == "hip":
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with patch("vllm.attention.selector.is_hip", return_value=True):
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backend = which_attn_to_use(16, torch.float16, torch.float16, 16,
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False)
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assert backend.name == "ROCM_FLASH"
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elif device == "openvino":
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with patch("vllm.attention.selector.is_openvino", return_value=True):
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backend = which_attn_to_use(16, torch.float16, torch.float16, 16,
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False)
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assert backend.name == "OPENVINO"
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else:
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backend = which_attn_to_use(16, torch.float16, torch.float16, 16,
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False)
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assert backend.name == name
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def test_flash_attn(monkeypatch):
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"""Test FlashAttn validation."""
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override_backend_env_variable(monkeypatch, STR_FLASH_ATTN_VAL)
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# Unsupported CUDA arch
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with patch("torch.cuda.get_device_capability", return_value=(7, 5)):
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backend = which_attn_to_use(16, torch.float16, None, 16, False)
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assert backend.name != STR_FLASH_ATTN_VAL
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# Unsupported data type
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backend = which_attn_to_use(16, torch.float8_e4m3fn, None, 16, False)
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assert backend.name != STR_FLASH_ATTN_VAL
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# Unsupported kv cache data type
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backend = which_attn_to_use(16, torch.float16, "fp8", 16, False)
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assert backend.name != STR_FLASH_ATTN_VAL
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# Unsupported block size
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backend = which_attn_to_use(16, torch.float16, None, 8, False)
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assert backend.name != STR_FLASH_ATTN_VAL
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# flash-attn is not installed
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with patch.dict('sys.modules', {'vllm_flash_attn': None}):
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backend = which_attn_to_use(16, torch.float16, None, 16, False)
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assert backend.name != STR_FLASH_ATTN_VAL
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# Unsupported head size
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backend = which_attn_to_use(17, torch.float16, None, 16, False)
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assert backend.name != STR_FLASH_ATTN_VAL
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# Attention-free models should bypass env and use PlaceholderAttention
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backend = which_attn_to_use(16, torch.float16, torch.float16, 16, True)
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assert backend.name != STR_FLASH_ATTN_VAL
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def test_invalid_env(monkeypatch):
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"""Throw an exception if the backend name is invalid."""
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override_backend_env_variable(monkeypatch, STR_INVALID_VAL)
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with pytest.raises(ValueError):
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which_attn_to_use(16, torch.float16, None, 16, False)
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