68 lines
2.0 KiB
Python
68 lines
2.0 KiB
Python
import itertools
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from typing import Optional, Tuple
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import pytest
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import torch
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from sgl_kernel import sgl_per_tensor_quant_fp8
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from sglang.srt.utils import is_hip
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_is_hip = is_hip()
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fp8_type_ = torch.float8_e4m3fnuz if _is_hip else torch.float8_e4m3fn
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def sglang_scaled_fp8_quant(
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input: torch.Tensor,
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scale: Optional[torch.Tensor] = None,
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) -> Tuple[torch.Tensor, torch.Tensor]:
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fp8_type_: torch.dtype = torch.float8_e4m3fn
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output = torch.empty_like(input, device=input.device, dtype=fp8_type_)
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is_static = True
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if scale is None:
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scale = torch.zeros(1, device=input.device, dtype=torch.float32)
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is_static = False
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sgl_per_tensor_quant_fp8(input, output, scale, is_static)
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return output, scale
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def torch_scaled_fp8_quant(tensor, inv_scale):
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# The reference implementation that fully aligns to
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# the kernel being tested.
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finfo = torch.finfo(torch.float8_e4m3fn)
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scale = inv_scale.reciprocal()
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qweight = (tensor.to(torch.float32) * scale).clamp(min=finfo.min, max=finfo.max)
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qweight = qweight.to(torch.float8_e4m3fn)
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return qweight
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@pytest.mark.parametrize(
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"num_tokens,hidden_dim",
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list(itertools.product([128, 256, 512], [512, 2048, 4096])),
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)
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def test_per_tensor_quant_compare_implementations(
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num_tokens: int,
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hidden_dim: int,
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):
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device = torch.device("cuda")
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x = torch.rand((num_tokens, hidden_dim), dtype=torch.float16, device=device)
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sglang_out, sglang_scale = sglang_scaled_fp8_quant(x)
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torch_out = torch_scaled_fp8_quant(x, sglang_scale)
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torch.testing.assert_close(
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sglang_out.float(), torch_out.float(), rtol=1e-3, atol=1e-3
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)
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scale = torch.rand(1, dtype=torch.float32, device=device)
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sglang_out, sglang_scale = sglang_scaled_fp8_quant(x, scale)
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torch_out = torch_scaled_fp8_quant(x, scale)
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torch.testing.assert_close(
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sglang_out.float(), torch_out.float(), rtol=1e-3, atol=1e-3
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)
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if __name__ == "__main__":
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pytest.main([__file__])
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