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https://github.com/AUTOMATIC1111/stable-diffusion-webui.git
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82 lines
3.5 KiB
Python
82 lines
3.5 KiB
Python
import torch
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import network
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from lyco_helpers import factorization
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from einops import rearrange
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class ModuleTypeOFT(network.ModuleType):
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def create_module(self, net: network.Network, weights: network.NetworkWeights):
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if all(x in weights.w for x in ["oft_blocks"]) or all(x in weights.w for x in ["oft_diag"]):
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return NetworkModuleOFT(net, weights)
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return None
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# Supports both kohya-ss' implementation of COFT https://github.com/kohya-ss/sd-scripts/blob/main/networks/oft.py
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# and KohakuBlueleaf's implementation of OFT/COFT https://github.com/KohakuBlueleaf/LyCORIS/blob/dev/lycoris/modules/diag_oft.py
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class NetworkModuleOFT(network.NetworkModule):
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def __init__(self, net: network.Network, weights: network.NetworkWeights):
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super().__init__(net, weights)
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self.lin_module = None
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self.org_module: list[torch.Module] = [self.sd_module]
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self.scale = 1.0
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# kohya-ss
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if "oft_blocks" in weights.w.keys():
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self.is_kohya = True
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self.oft_blocks = weights.w["oft_blocks"] # (num_blocks, block_size, block_size)
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self.alpha = weights.w["alpha"] # alpha is constraint
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self.dim = self.oft_blocks.shape[0] # lora dim
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# LyCORIS
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elif "oft_diag" in weights.w.keys():
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self.is_kohya = False
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self.oft_blocks = weights.w["oft_diag"]
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# self.alpha is unused
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self.dim = self.oft_blocks.shape[1] # (num_blocks, block_size, block_size)
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is_linear = type(self.sd_module) in [torch.nn.Linear, torch.nn.modules.linear.NonDynamicallyQuantizableLinear]
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is_conv = type(self.sd_module) in [torch.nn.Conv2d]
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is_other_linear = type(self.sd_module) in [torch.nn.MultiheadAttention] # unsupported
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if is_linear:
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self.out_dim = self.sd_module.out_features
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elif is_conv:
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self.out_dim = self.sd_module.out_channels
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elif is_other_linear:
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self.out_dim = self.sd_module.embed_dim
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if self.is_kohya:
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self.constraint = self.alpha * self.out_dim
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self.num_blocks = self.dim
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self.block_size = self.out_dim // self.dim
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else:
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self.constraint = None
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self.block_size, self.num_blocks = factorization(self.out_dim, self.dim)
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def calc_updown(self, orig_weight):
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I = torch.eye(self.block_size, device=self.oft_blocks.device)
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oft_blocks = self.oft_blocks.to(orig_weight.device, dtype=orig_weight.dtype)
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if self.is_kohya:
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block_Q = oft_blocks - oft_blocks.transpose(1, 2) # ensure skew-symmetric orthogonal matrix
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norm_Q = torch.norm(block_Q.flatten())
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new_norm_Q = torch.clamp(norm_Q, max=self.constraint)
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block_Q = block_Q * ((new_norm_Q + 1e-8) / (norm_Q + 1e-8))
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oft_blocks = torch.matmul(I + block_Q, (I - block_Q).float().inverse())
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R = oft_blocks.to(orig_weight.device, dtype=orig_weight.dtype)
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# This errors out for MultiheadAttention, might need to be handled up-stream
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merged_weight = rearrange(orig_weight, '(k n) ... -> k n ...', k=self.num_blocks, n=self.block_size)
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merged_weight = torch.einsum(
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'k n m, k n ... -> k m ...',
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R,
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merged_weight
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)
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merged_weight = rearrange(merged_weight, 'k m ... -> (k m) ...')
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updown = merged_weight.to(orig_weight.device, dtype=orig_weight.dtype) - orig_weight
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output_shape = orig_weight.shape
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return self.finalize_updown(updown, orig_weight, output_shape)
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