mirror of
https://github.com/vladmandic/sdnext.git
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69 lines
2.8 KiB
Python
69 lines
2.8 KiB
Python
# pylint: disable=relative-beyond-top-level,redefined-builtin,protected-access
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from typing import Tuple
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import torch
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from ...common import compile_func # noqa: TID252
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from ...packed_float import unpack_float # noqa: TID252
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from ...dequantizer import quantize_fp_mm # noqa: TID252
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from .forward import check_mats
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def quantize_fp_mm_input(input: torch.FloatTensor, matmul_dtype: str = "float8_e4m3fn") -> Tuple[torch.Tensor, torch.FloatTensor]:
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input = input.flatten(0,-2).to(dtype=torch.float32)
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input, input_scale = quantize_fp_mm(input, dim=-1, matmul_dtype=matmul_dtype)
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return input, input_scale
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def fp8_matmul(
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input: torch.FloatTensor,
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weight: torch.Tensor,
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scale: torch.FloatTensor,
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bias: torch.FloatTensor = None,
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svd_up: torch.FloatTensor = None,
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svd_down: torch.FloatTensor = None,
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quantized_weight_shape: torch.Size = None,
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weights_dtype: str = None,
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) -> torch.FloatTensor:
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if quantized_weight_shape is not None:
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weight = unpack_float(weight, quantized_weight_shape, weights_dtype).to(dtype=torch.float8_e4m3fn).t_()
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scale = scale.t()
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return_dtype = input.dtype
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output_shape = (*input.shape[:-1], weight.shape[-1])
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if svd_up is not None:
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input = input.flatten(0,-2)
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svd_bias = torch.mm(torch.mm(input.to(dtype=svd_down.dtype), svd_down), svd_up)
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input, input_scale = quantize_fp_mm_input(input)
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input, weight = check_mats(input, weight)
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if bias is not None and bias.dtype != torch.bfloat16:
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bias = bias.to(dtype=torch.bfloat16)
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result = torch._scaled_mm(input, weight, scale_a=input_scale, scale_b=scale, bias=bias, out_dtype=torch.bfloat16)
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if svd_up is not None:
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result.add_(svd_bias)
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result = result.view(output_shape).to(return_dtype)
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return result
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def quantized_linear_forward_fp8_matmul(self, input: torch.FloatTensor) -> torch.FloatTensor:
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if torch.numel(input) / input.shape[-1] < 32:
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return torch.nn.functional.linear(input, self.sdnq_dequantizer(self.weight, self.scale, self.zero_point, self.svd_up, self.svd_down, skip_quantized_matmul=True), self.bias)
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if self.sdnq_dequantizer.re_quantize_for_matmul:
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weight, scale = self.sdnq_dequantizer.re_quantize_matmul(self.weight, self.scale, self.zero_point, None, None)
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quantized_weight_shape = None
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else:
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weight, scale = self.weight, self.scale
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quantized_weight_shape = self.sdnq_dequantizer.quantized_weight_shape if self.sdnq_dequantizer.is_packed else None
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return fp8_matmul(
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input, weight, scale,
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bias=self.bias,
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svd_up=self.svd_up,
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svd_down=self.svd_down,
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quantized_weight_shape=quantized_weight_shape,
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weights_dtype=self.sdnq_dequantizer.weights_dtype,
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)
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fp8_matmul = compile_func(fp8_matmul)
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