fix(l4): fix fp8 logic on l4 (#2277)
* fix(l4): fix fp8 logic on l4 * also quant weights with single scale * use marlin even on 89
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@ -32,8 +32,8 @@ def get_fp8_linear() -> torch.nn.Module:
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"""
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if SYSTEM == "cuda":
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major, minor = torch.cuda.get_device_capability()
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if major == 8 and minor < 9:
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major, _ = torch.cuda.get_device_capability()
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if major == 8:
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from text_generation_server.layers.marlin import GPTQMarlinFP8Linear
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return GPTQMarlinFP8Linear
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@ -42,8 +42,10 @@ def get_fp8_linear() -> torch.nn.Module:
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return Fp8Linear
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def fp8_quantize(weight, scale_upper_bound=None, qdtype=torch.float8_e4m3fn):
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if FBGEMM_DYN_AVAILABLE:
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def fp8_quantize(
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weight, scale_upper_bound=None, qdtype=torch.float8_e4m3fn, scalar=False
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):
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if FBGEMM_DYN_AVAILABLE and not scalar:
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qweight, scale = torch.ops.fbgemm.quantize_fp8_per_row(
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weight, bs=None, scale_ub=scale_upper_bound, output_dtype=qdtype
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)
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@ -186,6 +188,9 @@ class Fp8Linear(torch.nn.Module):
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dtype,
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) -> None:
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super().__init__()
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if FBGEMM_MM_AVAILABLE:
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log_once(logger.info, "Using FBGEMM fp8 optimized kernels")
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self.dtype = dtype
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self.qweight = qweight
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self.scale = scale
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@ -201,7 +206,7 @@ class Fp8Linear(torch.nn.Module):
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@classmethod
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def from_unquant(cls, weight, bias, dtype):
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qweight, scale = fp8_quantize(weight)
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qweight, scale = fp8_quantize(weight, scalar=not FBGEMM_MM_AVAILABLE)
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return cls(
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qweight=qweight, scale=scale, scale_upper_bound=None, bias=bias, dtype=dtype
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)
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@ -232,7 +237,7 @@ class Fp8Linear(torch.nn.Module):
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)
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return y.to(self.dtype)
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qinput, scale = fp8_quantize(input)
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qinput, scale = fp8_quantize(input, scalar=True)
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output, _ = torch._scaled_mm(
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qinput,
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self.qweight.t(),
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