| from typing import TypeVar | |
| import torch | |
| from torch import nn | |
| import bitsandbytes as bnb | |
| T = TypeVar("T", bound="torch.nn.Module") | |
| class LinearFP8Mixed(nn.Linear): | |
| def __init__(self, input_features, output_features, bias=True): | |
| super().__init__(input_features, output_features, bias) | |
| self.bw_code = None | |
| self.fw_code = None | |
| array = [4096, 2048, 1024, 512, 256, 128, 64, 0] | |
| for i, k in enumerate(array): | |
| if input_features > array[i + 1]: | |
| self.bsz = k | |
| break | |
| for i, k in enumerate(array): | |
| if output_features > array[i + 1]: | |
| self.bsz2 = k | |
| break | |
| def forward(self, x: torch.Tensor): | |
| if self.fw_code is None: | |
| self.bw_code = bnb.functional.create_fp8_map(True, 5, 2, 8).to(x.device) | |
| self.fw_code = bnb.functional.create_fp8_map(True, 4, 3, 8).to(x.device) | |
| out = bnb.research.matmul_fp8_mixed( | |
| x, | |
| self.weight.t(), | |
| fw_code=self.fw_code, | |
| bw_code=self.bw_code, | |
| bsz=self.bsz, | |
| bsz2=self.bsz2, | |
| ) | |
| if self.bias is not None: | |
| out += self.bias | |
| return out | |
| class LinearFP8Global(nn.Linear): | |
| def __init__(self, input_features, output_features, bias=True): | |
| super().__init__(input_features, output_features, bias) | |
| self.bw_code = None | |
| self.fw_code = None | |
| array = [4096, 2048, 1024, 512, 256, 128, 64, 0] | |
| for i, k in enumerate(array): | |
| if input_features > array[i + 1]: | |
| self.bsz = k | |
| break | |
| for i, k in enumerate(array): | |
| if output_features > array[i + 1]: | |
| self.bsz2 = k | |
| break | |
| def forward(self, x: torch.Tensor): | |
| if self.fw_code is None: | |
| self.bw_code = bnb.functional.create_fp8_map(True, 5, 2, 8).to(x.device) | |
| self.fw_code = bnb.functional.create_fp8_map(True, 4, 3, 8).to(x.device) | |
| out = bnb.matmul_fp8_global( | |
| x, | |
| self.weight.t(), | |
| fw_code=self.fw_code, | |
| bw_code=self.bw_code, | |
| bsz=self.bsz, | |
| bsz2=self.bsz2, | |
| ) | |
| if self.bias is not None: | |
| out += self.bias | |
| return out | |