import datetime import glob import html import os import sys import traceback import tqdm import torch from ldm.util import default from modules import devices, shared, processing, sd_models import torch from torch import einsum from einops import rearrange, repeat import modules.textual_inversion.dataset class HypernetworkModule(torch.nn.Module): def __init__(self, dim, state_dict=None): super().__init__() self.linear1 = torch.nn.Linear(dim, dim * 2) self.linear2 = torch.nn.Linear(dim * 2, dim) if state_dict is not None: self.load_state_dict(state_dict, strict=True) else: self.linear1.weight.data.normal_(mean=0.0, std=0.01) self.linear1.bias.data.zero_() self.linear2.weight.data.normal_(mean=0.0, std=0.01) self.linear2.bias.data.zero_() self.to(devices.device) def forward(self, x): return x + (self.linear2(self.linear1(x))) class Hypernetwork: filename = None name = None def __init__(self, name=None, enable_sizes=None): self.filename = None self.name = name self.layers = {} self.step = 0 self.sd_checkpoint = None self.sd_checkpoint_name = None for size in enable_sizes or [320, 640, 768, 1280]: self.layers[size] = (HypernetworkModule(size), HypernetworkModule(size)) def weights(self): res = [] for k, layers in self.layers.items(): for layer in layers: layer.train() res += [layer.linear1.weight, layer.linear1.bias, layer.linear2.weight, layer.linear2.bias] return res def save(self, filename): state_dict = {} for k, v in self.layers.items(): state_dict[k] = (v[0].state_dict(), v[1].state_dict()) state_dict['step'] = self.step state_dict['name'] = self.name state_dict['sd_checkpoint'] = self.sd_checkpoint state_dict['sd_checkpoint_name'] = self.sd_checkpoint_name torch.save(state_dict, filename) def load(self, filename): self.filename = filename if self.name is None: self.name = os.path.splitext(os.path.basename(filename))[0] state_dict = torch.load(filename, map_location='cpu') for size, sd in state_dict.items(): if type(size) == int: self.layers[size] = (HypernetworkModule(size, sd[0]), HypernetworkModule(size, sd[1])) self.name = state_dict.get('name', self.name) self.step = state_dict.get('step', 0) self.sd_checkpoint = state_dict.get('sd_checkpoint', None) self.sd_checkpoint_name = state_dict.get('sd_checkpoint_name', None) def list_hypernetworks(path): res = {} for filename in glob.iglob(os.path.join(path, '**/*.pt'), recursive=True): name = os.path.splitext(os.path.basename(filename))[0] res[name] = filename return res def load_hypernetwork(filename): path = shared.hypernetworks.get(filename, None) if path is not None: print(f"Loading hypernetwork {filename}") try: shared.loaded_hypernetwork = Hypernetwork() shared.loaded_hypernetwork.load(path) except Exception: print(f"Error loading hypernetwork {path}", file=sys.stderr) print(traceback.format_exc(), file=sys.stderr) else: if shared.loaded_hypernetwork is not None: print(f"Unloading hypernetwork") shared.loaded_hypernetwork = None def apply_hypernetwork(hypernetwork, context, layer=None): hypernetwork_layers = (hypernetwork.layers if hypernetwork is not None else {}).get(context.shape[2], None) if hypernetwork_layers is None: return context, context if layer is not None: layer.hyper_k = hypernetwork_layers[0] layer.hyper_v = hypernetwork_layers[1] context_k = hypernetwork_layers[0](context) context_v = hypernetwork_layers[1](context) return context_k, context_v def attention_CrossAttention_forward(self, x, context=None, mask=None): h = self.heads q = self.to_q(x) context = default(context, x) context_k, context_v = apply_hypernetwork(shared.loaded_hypernetwork, context, self) k = self.to_k(context_k) v = self.to_v(context_v) q, k, v = map(lambda t: rearrange(t, 'b n (h d) -> (b h) n d', h=h), (q, k, v)) sim = einsum('b i d, b j d -> b i j', q, k) * self.scale if mask is not None: mask = rearrange(mask, 'b ... -> b (...)') max_neg_value = -torch.finfo(sim.dtype).max mask = repeat(mask, 'b j -> (b h) () j', h=h) sim.masked_fill_(~mask, max_neg_value) # attention, what we cannot get enough of attn = sim.softmax(dim=-1) out = einsum('b i j, b j d -> b i d', attn, v) out = rearrange(out, '(b h) n d -> b n (h d)', h=h) return self.to_out(out) def train_hypernetwork(hypernetwork_name, learn_rate, data_root, log_directory, steps, create_image_every, save_hypernetwork_every, template_file, preview_image_prompt): assert hypernetwork_name, 'embedding not selected' path = shared.hypernetworks.get(hypernetwork_name, None) shared.loaded_hypernetwork = Hypernetwork() shared.loaded_hypernetwork.load(path) shared.state.textinfo = "Initializing hypernetwork training..." shared.state.job_count = steps filename = os.path.join(shared.cmd_opts.hypernetwork_dir, f'{hypernetwork_name}.pt') log_directory = os.path.join(log_directory, datetime.datetime.now().strftime("%Y-%m-%d"), hypernetwork_name) if save_hypernetwork_every > 0: hypernetwork_dir = os.path.join(log_directory, "hypernetworks") os.makedirs(hypernetwork_dir, exist_ok=True) else: hypernetwork_dir = None if create_image_every > 0: images_dir = os.path.join(log_directory, "images") os.makedirs(images_dir, exist_ok=True) else: images_dir = None cond_model = shared.sd_model.cond_stage_model shared.state.textinfo = f"Preparing dataset from {html.escape(data_root)}..." with torch.autocast("cuda"): ds = modules.textual_inversion.dataset.PersonalizedBase(data_root=data_root, width=512, height=512, repeats=1, placeholder_token=hypernetwork_name, model=shared.sd_model, device=devices.device, template_file=template_file) hypernetwork = shared.loaded_hypernetwork weights = hypernetwork.weights() for weight in weights: weight.requires_grad = True optimizer = torch.optim.AdamW(weights, lr=learn_rate) losses = torch.zeros((32,)) last_saved_file = "" last_saved_image = "" ititial_step = hypernetwork.step or 0 if ititial_step > steps: return hypernetwork, filename pbar = tqdm.tqdm(enumerate(ds), total=steps - ititial_step) for i, (x, text) in pbar: hypernetwork.step = i + ititial_step if hypernetwork.step > steps: break if shared.state.interrupted: break with torch.autocast("cuda"): c = cond_model([text]) x = x.to(devices.device) loss = shared.sd_model(x.unsqueeze(0), c)[0] del x losses[hypernetwork.step % losses.shape[0]] = loss.item() optimizer.zero_grad() loss.backward() optimizer.step() pbar.set_description(f"loss: {losses.mean():.7f}") if hypernetwork.step > 0 and hypernetwork_dir is not None and hypernetwork.step % save_hypernetwork_every == 0: last_saved_file = os.path.join(hypernetwork_dir, f'{hypernetwork_name}-{hypernetwork.step}.pt') hypernetwork.save(last_saved_file) if hypernetwork.step > 0 and images_dir is not None and hypernetwork.step % create_image_every == 0: last_saved_image = os.path.join(images_dir, f'{hypernetwork_name}-{hypernetwork.step}.png') preview_text = text if preview_image_prompt == "" else preview_image_prompt p = processing.StableDiffusionProcessingTxt2Img( sd_model=shared.sd_model, prompt=preview_text, steps=20, do_not_save_grid=True, do_not_save_samples=True, ) processed = processing.process_images(p) image = processed.images[0] shared.state.current_image = image image.save(last_saved_image) last_saved_image += f", prompt: {preview_text}" shared.state.job_no = hypernetwork.step shared.state.textinfo = f"""

Loss: {losses.mean():.7f}
Step: {hypernetwork.step}
Last prompt: {html.escape(text)}
Last saved embedding: {html.escape(last_saved_file)}
Last saved image: {html.escape(last_saved_image)}

""" checkpoint = sd_models.select_checkpoint() hypernetwork.sd_checkpoint = checkpoint.hash hypernetwork.sd_checkpoint_name = checkpoint.model_name hypernetwork.save(filename) return hypernetwork, filename