Delete utils.py

utils.py

@@ -1,127 +0,0 @@
-import torch
-import torch.nn.functional as F
-from torch import nn
-from torch.cuda.amp import custom_fwd, custom_bwd
-
-from bitsandbytes.functional import quantize_blockwise, dequantize_blockwise
-
-
-
-class FrozenBNBLinear(nn.Module):
-    def __init__(self, weight, absmax, code, bias=None):
-        assert isinstance(bias, nn.Parameter) or bias is None
-        super().__init__()
-        self.out_features, self.in_features = weight.shape
-        self.register_buffer("weight", weight.requires_grad_(False))
-        self.register_buffer("absmax", absmax.requires_grad_(False))
-        self.register_buffer("code", code.requires_grad_(False))
-        self.adapter = None
-        self.bias = bias
- 
-    def forward(self, input):
-        output = DequantizeAndLinear.apply(input, self.weight, self.absmax, self.code, self.bias)
-        if self.adapter:
-            output += self.adapter(input)
-        return output
- 
-    @classmethod
-    def from_linear(cls, linear: nn.Linear) -> "FrozenBNBLinear":
-        weights_int8, state = quantize_blockise_lowmemory(linear.weight)
-        return cls(weights_int8, *state, linear.bias)
- 
-    def __repr__(self):
-        return f"{self.__class__.__name__}({self.in_features}, {self.out_features})"
- 
- 
-class DequantizeAndLinear(torch.autograd.Function): 
-    @staticmethod
-    @custom_fwd
-    def forward(ctx, input: torch.Tensor, weights_quantized: torch.ByteTensor,
-                absmax: torch.FloatTensor, code: torch.FloatTensor, bias: torch.FloatTensor):
-        weights_deq = dequantize_blockwise(weights_quantized, absmax=absmax, code=code)
-        ctx.save_for_backward(input, weights_quantized, absmax, code)
-        ctx._has_bias = bias is not None
-        return F.linear(input, weights_deq, bias)
- 
-    @staticmethod
-    @custom_bwd
-    def backward(ctx, grad_output: torch.Tensor):
-        assert not ctx.needs_input_grad[1] and not ctx.needs_input_grad[2] and not ctx.needs_input_grad[3]
-        input, weights_quantized, absmax, code = ctx.saved_tensors
-        # grad_output: [*batch, out_features]
-        weights_deq = dequantize_blockwise(weights_quantized, absmax=absmax, code=code)
-        grad_input = grad_output @ weights_deq
-        grad_bias = grad_output.flatten(0, -2).sum(dim=0) if ctx._has_bias else None
-        return grad_input, None, None, None, grad_bias
- 
- 
-class FrozenBNBEmbedding(nn.Module):
-    def __init__(self, weight, absmax, code):
-        super().__init__()
-        self.num_embeddings, self.embedding_dim = weight.shape
-        self.register_buffer("weight", weight.requires_grad_(False))
-        self.register_buffer("absmax", absmax.requires_grad_(False))
-        self.register_buffer("code", code.requires_grad_(False))
-        self.adapter = None
- 
-    def forward(self, input, **kwargs):
-        with torch.no_grad():
-            # note: both quantuized weights and input indices are *not* differentiable
-            weight_deq = dequantize_blockwise(self.weight, absmax=self.absmax, code=self.code)
-            output = F.embedding(input, weight_deq, **kwargs)
-        if self.adapter:
-            output += self.adapter(input)
-        return output 
- 
-    @classmethod
-    def from_embedding(cls, embedding: nn.Embedding) -> "FrozenBNBEmbedding":
-        weights_int8, state = quantize_blockise_lowmemory(embedding.weight)
-        return cls(weights_int8, *state)
- 
-    def __repr__(self):
-        return f"{self.__class__.__name__}({self.num_embeddings}, {self.embedding_dim})"
- 
- 
-def quantize_blockise_lowmemory(matrix: torch.Tensor, chunk_size: int = 2 ** 20):
-    assert chunk_size % 4096 == 0
-    code = None
-    chunks = []
-    absmaxes = []
-    flat_tensor = matrix.view(-1)
-    for i in range((matrix.numel() - 1) // chunk_size + 1):
-        input_chunk = flat_tensor[i * chunk_size: (i + 1) * chunk_size].clone()
-        quantized_chunk, (absmax_chunk, code) = quantize_blockwise(input_chunk, code=code)
-        chunks.append(quantized_chunk)
-        absmaxes.append(absmax_chunk)
- 
-    matrix_i8 = torch.cat(chunks).reshape_as(matrix)
-    absmax = torch.cat(absmaxes)
-    return matrix_i8, (absmax, code)
- 
- 
-def convert_to_int8(model):
-    """Convert linear and embedding modules to 8-bit with optional adapters"""
-    for module in list(model.modules()):
-        for name, child in module.named_children():
-            if isinstance(child, nn.Linear):
-                print(name, child)
-                setattr( 
-                    module,
-                    name,
-                    FrozenBNBLinear(
-                        weight=torch.zeros(child.out_features, child.in_features, dtype=torch.uint8),
-                        absmax=torch.zeros((child.weight.numel() - 1) // 4096 + 1),
-                        code=torch.zeros(256),
-                        bias=child.bias,
-                    ),
-                )
-            elif isinstance(child, nn.Embedding):
-                setattr(
-                    module,
-                    name,
-                    FrozenBNBEmbedding(
-                        weight=torch.zeros(child.num_embeddings, child.embedding_dim, dtype=torch.uint8),
-                        absmax=torch.zeros((child.weight.numel() - 1) // 4096 + 1),
-                        code=torch.zeros(256),
-                    )
-                )