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import torch
import network
class ModuleTypeOFT(network.ModuleType):
def create_module(self, net: network.Network, weights: network.NetworkWeights):
if all(x in weights.w for x in ["oft_blocks"]):
return NetworkModuleOFT(net, weights)
return None
# adapted from kohya's implementation https://github.com/kohya-ss/sd-scripts/blob/main/networks/oft.py
class NetworkModuleOFT(network.NetworkModule):
def __init__(self, net: network.Network, weights: network.NetworkWeights):
super().__init__(net, weights)
self.oft_blocks = weights.w["oft_blocks"]
self.alpha = weights.w["alpha"]
self.dim = self.oft_blocks.shape[0]
self.num_blocks = self.dim
if "Linear" in self.sd_module.__class__.__name__:
self.out_dim = self.sd_module.out_features
elif "Conv" in self.sd_module.__class__.__name__:
self.out_dim = self.sd_module.out_channels
self.constraint = self.alpha * self.out_dim
self.block_size = self.out_dim // self.num_blocks
self.org_module: list[torch.Module] = [self.sd_module]
self.R = self.get_weight(self.oft_blocks)
self.apply_to()
# replace forward method of original linear rather than replacing the module
# how do we revert this to unload the weights?
def apply_to(self):
self.org_forward = self.org_module[0].forward
#self.org_module[0].forward = self.forward
self.org_module[0].register_forward_hook(self.forward_hook)
def get_weight(self, oft_blocks, multiplier=None):
self.constraint = self.constraint.to(oft_blocks.device, dtype=oft_blocks.dtype)
block_Q = oft_blocks - oft_blocks.transpose(1, 2)
norm_Q = torch.norm(block_Q.flatten())
new_norm_Q = torch.clamp(norm_Q, max=self.constraint)
block_Q = block_Q * ((new_norm_Q + 1e-8) / (norm_Q + 1e-8))
m_I = torch.eye(self.block_size, device=self.oft_blocks.device).unsqueeze(0).repeat(self.num_blocks, 1, 1)
block_R = torch.matmul(m_I + block_Q, (m_I - block_Q).inverse())
#block_R_weighted = multiplier * block_R + (1 - multiplier) * I
#R = torch.block_diag(*block_R_weighted)
R = torch.block_diag(*block_R)
return R
def calc_updown(self, orig_weight):
oft_blocks = self.oft_blocks.to(orig_weight.device, dtype=orig_weight.dtype)
R = self.get_weight(oft_blocks)
self.R = R
# if orig_weight.dim() == 4:
# weight = torch.einsum("oihw, op -> pihw", orig_weight, R)
# else:
# weight = torch.einsum("oi, op -> pi", orig_weight, R)
updown = orig_weight @ R
output_shape = self.oft_blocks.shape
return self.finalize_updown(updown, orig_weight, output_shape)
def forward_hook(self, module, args, output):
#print(f'Forward hook in {self.network_key} called')
x = output
R = self.R.to(x.device, dtype=x.dtype)
if x.dim() == 4:
x = x.permute(0, 2, 3, 1)
x = torch.matmul(x, R)
x = x.permute(0, 3, 1, 2)
else:
x = torch.matmul(x, R)
return x
# def forward(self, x, y=None):
# x = self.org_forward(x)
# if self.multiplier() == 0.0:
# return x
# # calculating R here is excruciatingly slow
# #R = self.get_weight().to(x.device, dtype=x.dtype)
# R = self.R.to(x.device, dtype=x.dtype)
# if x.dim() == 4:
# x = x.permute(0, 2, 3, 1)
# x = torch.matmul(x, R)
# x = x.permute(0, 3, 1, 2)
# else:
# x = torch.matmul(x, R)
# return x
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