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https://github.com/ostris/ai-toolkit.git
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475 lines
19 KiB
Python
475 lines
19 KiB
Python
import math
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import os
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import re
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import sys
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from typing import List, Optional, Dict, Type, Union
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import torch
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from transformers import CLIPTextModel
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from .paths import SD_SCRIPTS_ROOT
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sys.path.append(SD_SCRIPTS_ROOT)
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from networks.lora import LoRANetwork, get_block_index
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from torch.utils.checkpoint import checkpoint
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RE_UPDOWN = re.compile(r"(up|down)_blocks_(\d+)_(resnets|upsamplers|downsamplers|attentions)_(\d+)_")
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class LoRAModule(torch.nn.Module):
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"""
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replaces forward method of the original Linear, instead of replacing the original Linear module.
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"""
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def __init__(
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self,
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lora_name,
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org_module: torch.nn.Module,
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multiplier=1.0,
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lora_dim=4,
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alpha=1,
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dropout=None,
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rank_dropout=None,
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module_dropout=None,
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):
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"""if alpha == 0 or None, alpha is rank (no scaling)."""
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super().__init__()
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self.lora_name = lora_name
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if org_module.__class__.__name__ == "Conv2d":
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in_dim = org_module.in_channels
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out_dim = org_module.out_channels
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else:
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in_dim = org_module.in_features
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out_dim = org_module.out_features
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# if limit_rank:
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# self.lora_dim = min(lora_dim, in_dim, out_dim)
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# if self.lora_dim != lora_dim:
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# print(f"{lora_name} dim (rank) is changed to: {self.lora_dim}")
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# else:
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self.lora_dim = lora_dim
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if org_module.__class__.__name__ == "Conv2d":
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kernel_size = org_module.kernel_size
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stride = org_module.stride
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padding = org_module.padding
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self.lora_down = torch.nn.Conv2d(in_dim, self.lora_dim, kernel_size, stride, padding, bias=False)
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self.lora_up = torch.nn.Conv2d(self.lora_dim, out_dim, (1, 1), (1, 1), bias=False)
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else:
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self.lora_down = torch.nn.Linear(in_dim, self.lora_dim, bias=False)
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self.lora_up = torch.nn.Linear(self.lora_dim, out_dim, bias=False)
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if type(alpha) == torch.Tensor:
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alpha = alpha.detach().float().numpy() # without casting, bf16 causes error
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alpha = self.lora_dim if alpha is None or alpha == 0 else alpha
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self.scale = alpha / self.lora_dim
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self.register_buffer("alpha", torch.tensor(alpha)) # 定数として扱える
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# same as microsoft's
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torch.nn.init.kaiming_uniform_(self.lora_down.weight, a=math.sqrt(5))
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torch.nn.init.zeros_(self.lora_up.weight)
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self.multiplier: Union[float, List[float]] = multiplier
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self.org_module = org_module # remove in applying
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self.dropout = dropout
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self.rank_dropout = rank_dropout
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self.module_dropout = module_dropout
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self.is_checkpointing = False
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def apply_to(self):
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self.org_forward = self.org_module.forward
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self.org_module.forward = self.forward
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del self.org_module
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# this allows us to set different multipliers on a per item in a batch basis
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# allowing us to run positive and negative weights in the same batch
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# really only useful for slider training for now
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def get_multiplier(self, lora_up):
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batch_size = lora_up.size(0)
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# batch will have all negative prompts first and positive prompts second
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# our multiplier list is for a prompt pair. So we need to repeat it for positive and negative prompts
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# if there is more than our multiplier, it is liekly a batch size increase, so we need to
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# interleve the multipliers
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if isinstance(self.multiplier, list):
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if len(self.multiplier) == 0:
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# single item, just return it
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return self.multiplier[0]
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else:
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# we have a list of multipliers, so we need to get the multiplier for this batch
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multiplier_tensor = torch.tensor(self.multiplier * 2).to(lora_up.device, dtype=lora_up.dtype)
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# should be 1 for if total batch size was 1
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num_interleaves = (batch_size // 2) // len(self.multiplier)
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multiplier_tensor = multiplier_tensor.repeat_interleave(num_interleaves)
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# match lora_up rank
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if len(lora_up.size()) == 2:
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multiplier_tensor = multiplier_tensor.view(-1, 1)
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elif len(lora_up.size()) == 3:
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multiplier_tensor = multiplier_tensor.view(-1, 1, 1)
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elif len(lora_up.size()) == 4:
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multiplier_tensor = multiplier_tensor.view(-1, 1, 1, 1)
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return multiplier_tensor
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else:
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return self.multiplier
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def _call_forward(self, x):
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# module dropout
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if self.module_dropout is not None and self.training:
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if torch.rand(1) < self.module_dropout:
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return 0.0 # added to original forward
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lx = self.lora_down(x)
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# normal dropout
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if self.dropout is not None and self.training:
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lx = torch.nn.functional.dropout(lx, p=self.dropout)
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# rank dropout
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if self.rank_dropout is not None and self.training:
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mask = torch.rand((lx.size(0), self.lora_dim), device=lx.device) > self.rank_dropout
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if len(lx.size()) == 3:
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mask = mask.unsqueeze(1) # for Text Encoder
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elif len(lx.size()) == 4:
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mask = mask.unsqueeze(-1).unsqueeze(-1) # for Conv2d
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lx = lx * mask
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# scaling for rank dropout: treat as if the rank is changed
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# maskから計算することも考えられるが、augmentation的な効果を期待してrank_dropoutを用いる
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scale = self.scale * (1.0 / (1.0 - self.rank_dropout)) # redundant for readability
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else:
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scale = self.scale
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lx = self.lora_up(lx)
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multiplier = self.get_multiplier(lx)
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return lx * multiplier * scale
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def create_custom_forward(self):
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def custom_forward(*inputs):
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return self._call_forward(*inputs)
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return custom_forward
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def forward(self, x):
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org_forwarded = self.org_forward(x)
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# TODO this just loses the grad. Not sure why. Probably why no one else is doing it either
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# if torch.is_grad_enabled() and self.is_checkpointing and self.training:
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# lora_output = checkpoint(
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# self.create_custom_forward(),
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# x,
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# )
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# else:
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# lora_output = self._call_forward(x)
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lora_output = self._call_forward(x)
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return org_forwarded + lora_output
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def enable_gradient_checkpointing(self):
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self.is_checkpointing = True
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def disable_gradient_checkpointing(self):
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self.is_checkpointing = False
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class LoRASpecialNetwork(LoRANetwork):
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_multiplier: float = 1.0
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is_active: bool = False
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NUM_OF_BLOCKS = 12 # フルモデル相当でのup,downの層の数
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UNET_TARGET_REPLACE_MODULE = ["Transformer2DModel"]
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UNET_TARGET_REPLACE_MODULE_CONV2D_3X3 = ["ResnetBlock2D", "Downsample2D", "Upsample2D"]
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TEXT_ENCODER_TARGET_REPLACE_MODULE = ["CLIPAttention", "CLIPMLP"]
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LORA_PREFIX_UNET = "lora_unet"
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LORA_PREFIX_TEXT_ENCODER = "lora_te"
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# SDXL: must starts with LORA_PREFIX_TEXT_ENCODER
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LORA_PREFIX_TEXT_ENCODER1 = "lora_te1"
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LORA_PREFIX_TEXT_ENCODER2 = "lora_te2"
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def __init__(
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self,
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text_encoder: Union[List[CLIPTextModel], CLIPTextModel],
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unet,
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multiplier: float = 1.0,
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lora_dim: int = 4,
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alpha: float = 1,
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dropout: Optional[float] = None,
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rank_dropout: Optional[float] = None,
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module_dropout: Optional[float] = None,
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conv_lora_dim: Optional[int] = None,
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conv_alpha: Optional[float] = None,
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block_dims: Optional[List[int]] = None,
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block_alphas: Optional[List[float]] = None,
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conv_block_dims: Optional[List[int]] = None,
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conv_block_alphas: Optional[List[float]] = None,
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modules_dim: Optional[Dict[str, int]] = None,
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modules_alpha: Optional[Dict[str, int]] = None,
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module_class: Type[object] = LoRAModule,
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varbose: Optional[bool] = False,
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train_text_encoder: Optional[bool] = True,
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train_unet: Optional[bool] = True,
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) -> None:
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"""
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LoRA network: すごく引数が多いが、パターンは以下の通り
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1. lora_dimとalphaを指定
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2. lora_dim、alpha、conv_lora_dim、conv_alphaを指定
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3. block_dimsとblock_alphasを指定 : Conv2d3x3には適用しない
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4. block_dims、block_alphas、conv_block_dims、conv_block_alphasを指定 : Conv2d3x3にも適用する
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5. modules_dimとmodules_alphaを指定 (推論用)
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"""
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# call the parent of the parent we are replacing (LoRANetwork) init
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super(LoRANetwork, self).__init__()
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self.multiplier = multiplier
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self.lora_dim = lora_dim
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self.alpha = alpha
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self.conv_lora_dim = conv_lora_dim
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self.conv_alpha = conv_alpha
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self.dropout = dropout
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self.rank_dropout = rank_dropout
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self.module_dropout = module_dropout
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self.is_checkpointing = False
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if modules_dim is not None:
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print(f"create LoRA network from weights")
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elif block_dims is not None:
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print(f"create LoRA network from block_dims")
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print(
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f"neuron dropout: p={self.dropout}, rank dropout: p={self.rank_dropout}, module dropout: p={self.module_dropout}")
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print(f"block_dims: {block_dims}")
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print(f"block_alphas: {block_alphas}")
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if conv_block_dims is not None:
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print(f"conv_block_dims: {conv_block_dims}")
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print(f"conv_block_alphas: {conv_block_alphas}")
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else:
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print(f"create LoRA network. base dim (rank): {lora_dim}, alpha: {alpha}")
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print(
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f"neuron dropout: p={self.dropout}, rank dropout: p={self.rank_dropout}, module dropout: p={self.module_dropout}")
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if self.conv_lora_dim is not None:
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print(
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f"apply LoRA to Conv2d with kernel size (3,3). dim (rank): {self.conv_lora_dim}, alpha: {self.conv_alpha}")
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# create module instances
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def create_modules(
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is_unet: bool,
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text_encoder_idx: Optional[int], # None, 1, 2
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root_module: torch.nn.Module,
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target_replace_modules: List[torch.nn.Module],
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) -> List[LoRAModule]:
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prefix = (
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self.LORA_PREFIX_UNET
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if is_unet
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else (
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self.LORA_PREFIX_TEXT_ENCODER
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if text_encoder_idx is None
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else (self.LORA_PREFIX_TEXT_ENCODER1 if text_encoder_idx == 1 else self.LORA_PREFIX_TEXT_ENCODER2)
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)
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)
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loras = []
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skipped = []
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for name, module in root_module.named_modules():
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if module.__class__.__name__ in target_replace_modules:
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for child_name, child_module in module.named_modules():
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is_linear = child_module.__class__.__name__ == "Linear"
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is_conv2d = child_module.__class__.__name__ == "Conv2d"
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is_conv2d_1x1 = is_conv2d and child_module.kernel_size == (1, 1)
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if is_linear or is_conv2d:
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lora_name = prefix + "." + name + "." + child_name
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lora_name = lora_name.replace(".", "_")
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dim = None
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alpha = None
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if modules_dim is not None:
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# モジュール指定あり
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if lora_name in modules_dim:
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dim = modules_dim[lora_name]
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alpha = modules_alpha[lora_name]
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elif is_unet and block_dims is not None:
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# U-Netでblock_dims指定あり
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block_idx = get_block_index(lora_name)
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if is_linear or is_conv2d_1x1:
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dim = block_dims[block_idx]
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alpha = block_alphas[block_idx]
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elif conv_block_dims is not None:
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dim = conv_block_dims[block_idx]
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alpha = conv_block_alphas[block_idx]
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else:
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# 通常、すべて対象とする
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if is_linear or is_conv2d_1x1:
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dim = self.lora_dim
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alpha = self.alpha
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elif self.conv_lora_dim is not None:
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dim = self.conv_lora_dim
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alpha = self.conv_alpha
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if dim is None or dim == 0:
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# skipした情報を出力
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if is_linear or is_conv2d_1x1 or (
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self.conv_lora_dim is not None or conv_block_dims is not None):
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skipped.append(lora_name)
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continue
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lora = module_class(
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lora_name,
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child_module,
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self.multiplier,
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dim,
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alpha,
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dropout=dropout,
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rank_dropout=rank_dropout,
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module_dropout=module_dropout,
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)
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loras.append(lora)
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return loras, skipped
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text_encoders = text_encoder if type(text_encoder) == list else [text_encoder]
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# create LoRA for text encoder
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# 毎回すべてのモジュールを作るのは無駄なので要検討
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self.text_encoder_loras = []
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skipped_te = []
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if train_text_encoder:
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for i, text_encoder in enumerate(text_encoders):
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if len(text_encoders) > 1:
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index = i + 1
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print(f"create LoRA for Text Encoder {index}:")
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else:
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index = None
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print(f"create LoRA for Text Encoder:")
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text_encoder_loras, skipped = create_modules(False, index, text_encoder,
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LoRANetwork.TEXT_ENCODER_TARGET_REPLACE_MODULE)
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self.text_encoder_loras.extend(text_encoder_loras)
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skipped_te += skipped
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print(f"create LoRA for Text Encoder: {len(self.text_encoder_loras)} modules.")
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# extend U-Net target modules if conv2d 3x3 is enabled, or load from weights
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target_modules = LoRANetwork.UNET_TARGET_REPLACE_MODULE
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if modules_dim is not None or self.conv_lora_dim is not None or conv_block_dims is not None:
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target_modules += LoRANetwork.UNET_TARGET_REPLACE_MODULE_CONV2D_3X3
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if train_unet:
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self.unet_loras, skipped_un = create_modules(True, None, unet, target_modules)
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else:
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self.unet_loras = []
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skipped_un = []
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print(f"create LoRA for U-Net: {len(self.unet_loras)} modules.")
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skipped = skipped_te + skipped_un
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if varbose and len(skipped) > 0:
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print(
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f"because block_lr_weight is 0 or dim (rank) is 0, {len(skipped)} LoRA modules are skipped / block_lr_weightまたはdim (rank)が0の為、次の{len(skipped)}個のLoRAモジュールはスキップされます:"
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)
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for name in skipped:
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print(f"\t{name}")
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self.up_lr_weight: List[float] = None
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self.down_lr_weight: List[float] = None
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self.mid_lr_weight: float = None
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self.block_lr = False
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# assertion
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names = set()
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for lora in self.text_encoder_loras + self.unet_loras:
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assert lora.lora_name not in names, f"duplicated lora name: {lora.lora_name}"
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names.add(lora.lora_name)
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def save_weights(self, file, dtype, metadata):
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if metadata is not None and len(metadata) == 0:
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metadata = None
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state_dict = self.state_dict()
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if dtype is not None:
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for key in list(state_dict.keys()):
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v = state_dict[key]
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v = v.detach().clone().to("cpu").to(dtype)
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state_dict[key] = v
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if os.path.splitext(file)[1] == ".safetensors":
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from safetensors.torch import save_file
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save_file(state_dict, file, metadata)
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else:
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torch.save(state_dict, file)
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@property
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def multiplier(self) -> Union[float, List[float]]:
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return self._multiplier
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@multiplier.setter
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def multiplier(self, value: Union[float, List[float]]):
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self._multiplier = value
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self._update_lora_multiplier()
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def _update_lora_multiplier(self):
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if self.is_active:
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if hasattr(self, 'unet_loras'):
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for lora in self.unet_loras:
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lora.multiplier = self._multiplier
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if hasattr(self, 'text_encoder_loras'):
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for lora in self.text_encoder_loras:
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lora.multiplier = self._multiplier
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else:
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if hasattr(self, 'unet_loras'):
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for lora in self.unet_loras:
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lora.multiplier = 0
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if hasattr(self, 'text_encoder_loras'):
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for lora in self.text_encoder_loras:
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lora.multiplier = 0
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# called when the context manager is entered
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# ie: with network:
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def __enter__(self):
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self.is_active = True
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self._update_lora_multiplier()
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def __exit__(self, exc_type, exc_value, tb):
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self.is_active = False
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self._update_lora_multiplier()
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def force_to(self, device, dtype):
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self.to(device, dtype)
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loras = []
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if hasattr(self, 'unet_loras'):
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loras += self.unet_loras
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if hasattr(self, 'text_encoder_loras'):
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loras += self.text_encoder_loras
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for lora in loras:
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lora.to(device, dtype)
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def _update_checkpointing(self):
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if self.is_checkpointing:
|
|
if hasattr(self, 'unet_loras'):
|
|
for lora in self.unet_loras:
|
|
lora.enable_gradient_checkpointing()
|
|
if hasattr(self, 'text_encoder_loras'):
|
|
for lora in self.text_encoder_loras:
|
|
lora.enable_gradient_checkpointing()
|
|
else:
|
|
if hasattr(self, 'unet_loras'):
|
|
for lora in self.unet_loras:
|
|
lora.disable_gradient_checkpointing()
|
|
if hasattr(self, 'text_encoder_loras'):
|
|
for lora in self.text_encoder_loras:
|
|
lora.disable_gradient_checkpointing()
|
|
|
|
def enable_gradient_checkpointing(self):
|
|
# not supported
|
|
self.is_checkpointing = True
|
|
self._update_checkpointing()
|
|
|
|
def disable_gradient_checkpointing(self):
|
|
# not supported
|
|
self.is_checkpointing = False
|
|
self._update_checkpointing()
|