412 lines
16 KiB
Python
412 lines
16 KiB
Python
import os
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import sys
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import traceback
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import torch
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import tqdm
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import html
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import datetime
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import csv
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import numpy as np
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from PIL import Image, PngImagePlugin
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from torch.utils.tensorboard import SummaryWriter
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from modules import shared, devices, sd_hijack, processing, sd_models
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import modules.textual_inversion.dataset
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from modules.textual_inversion.learn_schedule import LearnRateScheduler
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from modules.textual_inversion.image_embedding import (embedding_to_b64, embedding_from_b64,
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insert_image_data_embed, extract_image_data_embed,
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caption_image_overlay)
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class Embedding:
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def __init__(self, vec, name, step=None):
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self.vec = vec
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self.name = name
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self.step = step
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self.cached_checksum = None
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self.sd_checkpoint = None
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self.sd_checkpoint_name = None
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def save(self, filename):
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embedding_data = {
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"string_to_token": {"*": 265},
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"string_to_param": {"*": self.vec},
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"name": self.name,
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"step": self.step,
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"sd_checkpoint": self.sd_checkpoint,
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"sd_checkpoint_name": self.sd_checkpoint_name,
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}
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torch.save(embedding_data, filename)
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def checksum(self):
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if self.cached_checksum is not None:
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return self.cached_checksum
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def const_hash(a):
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r = 0
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for v in a:
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r = (r * 281 ^ int(v) * 997) & 0xFFFFFFFF
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return r
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self.cached_checksum = f'{const_hash(self.vec.reshape(-1) * 100) & 0xffff:04x}'
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return self.cached_checksum
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class EmbeddingDatabase:
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def __init__(self, embeddings_dir):
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self.ids_lookup = {}
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self.word_embeddings = {}
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self.dir_mtime = None
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self.embeddings_dir = embeddings_dir
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def register_embedding(self, embedding, model):
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self.word_embeddings[embedding.name] = embedding
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ids = model.cond_stage_model.tokenizer([embedding.name], add_special_tokens=False)['input_ids'][0]
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first_id = ids[0]
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if first_id not in self.ids_lookup:
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self.ids_lookup[first_id] = []
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self.ids_lookup[first_id] = sorted(self.ids_lookup[first_id] + [(ids, embedding)], key=lambda x: len(x[0]), reverse=True)
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return embedding
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def load_textual_inversion_embeddings(self):
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mt = os.path.getmtime(self.embeddings_dir)
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if self.dir_mtime is not None and mt <= self.dir_mtime:
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return
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self.dir_mtime = mt
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self.ids_lookup.clear()
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self.word_embeddings.clear()
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def process_file(path, filename):
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name = os.path.splitext(filename)[0]
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data = []
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if os.path.splitext(filename.upper())[-1] in ['.PNG', '.WEBP', '.JXL', '.AVIF']:
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embed_image = Image.open(path)
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if hasattr(embed_image, 'text') and 'sd-ti-embedding' in embed_image.text:
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data = embedding_from_b64(embed_image.text['sd-ti-embedding'])
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name = data.get('name', name)
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else:
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data = extract_image_data_embed(embed_image)
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name = data.get('name', name)
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else:
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data = torch.load(path, map_location="cpu")
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# textual inversion embeddings
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if 'string_to_param' in data:
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param_dict = data['string_to_param']
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if hasattr(param_dict, '_parameters'):
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param_dict = getattr(param_dict, '_parameters') # fix for torch 1.12.1 loading saved file from torch 1.11
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assert len(param_dict) == 1, 'embedding file has multiple terms in it'
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emb = next(iter(param_dict.items()))[1]
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# diffuser concepts
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elif type(data) == dict and type(next(iter(data.values()))) == torch.Tensor:
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assert len(data.keys()) == 1, 'embedding file has multiple terms in it'
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emb = next(iter(data.values()))
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if len(emb.shape) == 1:
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emb = emb.unsqueeze(0)
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else:
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raise Exception(f"Couldn't identify {filename} as neither textual inversion embedding nor diffuser concept.")
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vec = emb.detach().to(devices.device, dtype=torch.float32)
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embedding = Embedding(vec, name)
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embedding.step = data.get('step', None)
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embedding.sd_checkpoint = data.get('hash', None)
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embedding.sd_checkpoint_name = data.get('sd_checkpoint_name', None)
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self.register_embedding(embedding, shared.sd_model)
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for fn in os.listdir(self.embeddings_dir):
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try:
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fullfn = os.path.join(self.embeddings_dir, fn)
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if os.stat(fullfn).st_size == 0:
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continue
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process_file(fullfn, fn)
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except Exception:
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print(f"Error loading emedding {fn}:", file=sys.stderr)
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print(traceback.format_exc(), file=sys.stderr)
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continue
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print(f"Loaded a total of {len(self.word_embeddings)} textual inversion embeddings.")
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print("Embeddings:", ', '.join(self.word_embeddings.keys()))
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def find_embedding_at_position(self, tokens, offset):
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token = tokens[offset]
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possible_matches = self.ids_lookup.get(token, None)
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if possible_matches is None:
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return None, None
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for ids, embedding in possible_matches:
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if tokens[offset:offset + len(ids)] == ids:
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return embedding, len(ids)
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return None, None
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def create_embedding(name, num_vectors_per_token, init_text='*'):
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cond_model = shared.sd_model.cond_stage_model
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embedding_layer = cond_model.wrapped.transformer.text_model.embeddings
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ids = cond_model.tokenizer(init_text, max_length=num_vectors_per_token, return_tensors="pt", add_special_tokens=False)["input_ids"]
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embedded = embedding_layer.token_embedding.wrapped(ids.to(devices.device)).squeeze(0)
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vec = torch.zeros((num_vectors_per_token, embedded.shape[1]), device=devices.device)
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for i in range(num_vectors_per_token):
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vec[i] = embedded[i * int(embedded.shape[0]) // num_vectors_per_token]
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fn = os.path.join(shared.cmd_opts.embeddings_dir, f"{name}.pt")
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assert not os.path.exists(fn), f"file {fn} already exists"
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embedding = Embedding(vec, name)
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embedding.step = 0
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embedding.save(fn)
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return fn
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def write_loss(log_directory, filename, step, epoch_len, values):
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if shared.opts.training_write_csv_every == 0:
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return
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if step % shared.opts.training_write_csv_every != 0:
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return
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write_csv_header = False if os.path.exists(os.path.join(log_directory, filename)) else True
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with open(os.path.join(log_directory, filename), "a+", newline='') as fout:
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csv_writer = csv.DictWriter(fout, fieldnames=["step", "epoch", "epoch_step", *(values.keys())])
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if write_csv_header:
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csv_writer.writeheader()
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epoch = step // epoch_len
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epoch_step = step - epoch * epoch_len
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csv_writer.writerow({
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"step": step + 1,
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"epoch": epoch + 1,
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"epoch_step": epoch_step + 1,
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**values,
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})
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def tensorboard_setup(log_directory):
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os.makedirs(os.path.join(log_directory, "tensorboard"), exist_ok=True)
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return SummaryWriter(
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log_dir=os.path.join(log_directory, "tensorboard"),
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flush_secs=shared.opts.training_tensorboard_flush_every)
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def tensorboard_add(tensorboard_writer, loss, global_step, step, learn_rate, epoch_num):
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tensorboard_add_scaler(tensorboard_writer, "Loss/train", loss, global_step)
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tensorboard_add_scaler(tensorboard_writer, f"Loss/train/epoch-{epoch_num}", loss, step)
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tensorboard_add_scaler(tensorboard_writer, "Learn rate/train", learn_rate, global_step)
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tensorboard_add_scaler(tensorboard_writer, f"Learn rate/train/epoch-{epoch_num}", learn_rate, step)
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def tensorboard_add_scaler(tensorboard_writer, tag, value, step):
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tensorboard_writer.add_scalar(tag=tag,
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scalar_value=value, global_step=step)
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def tensorboard_add_image(tensorboard_writer, tag, pil_image, step):
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# Convert a pil image to a torch tensor
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img_tensor = torch.as_tensor(np.array(pil_image, copy=True))
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img_tensor = img_tensor.view(pil_image.size[1], pil_image.size[0],
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len(pil_image.getbands()))
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img_tensor = img_tensor.permute((2, 0, 1))
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tensorboard_writer.add_image(tag, img_tensor, global_step=step)
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def train_embedding(embedding_name, learn_rate, batch_size, data_root, log_directory, training_width, training_height, steps, create_image_every, save_embedding_every, template_file, save_image_with_stored_embedding, preview_from_txt2img, preview_prompt, preview_negative_prompt, preview_steps, preview_sampler_index, preview_cfg_scale, preview_seed, preview_width, preview_height):
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assert embedding_name, 'embedding not selected'
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shared.state.textinfo = "Initializing textual inversion training..."
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shared.state.job_count = steps
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filename = os.path.join(shared.cmd_opts.embeddings_dir, f'{embedding_name}.pt')
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log_directory = os.path.join(log_directory, datetime.datetime.now().strftime("%Y-%m-%d"), embedding_name)
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if save_embedding_every > 0:
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embedding_dir = os.path.join(log_directory, "embeddings")
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os.makedirs(embedding_dir, exist_ok=True)
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else:
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embedding_dir = None
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if create_image_every > 0:
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images_dir = os.path.join(log_directory, "images")
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os.makedirs(images_dir, exist_ok=True)
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else:
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images_dir = None
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if create_image_every > 0 and save_image_with_stored_embedding:
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images_embeds_dir = os.path.join(log_directory, "image_embeddings")
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os.makedirs(images_embeds_dir, exist_ok=True)
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else:
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images_embeds_dir = None
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cond_model = shared.sd_model.cond_stage_model
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shared.state.textinfo = f"Preparing dataset from {html.escape(data_root)}..."
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with torch.autocast("cuda"):
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ds = modules.textual_inversion.dataset.PersonalizedBase(data_root=data_root, width=training_width, height=training_height, repeats=shared.opts.training_image_repeats_per_epoch, placeholder_token=embedding_name, model=shared.sd_model, device=devices.device, template_file=template_file, batch_size=batch_size)
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hijack = sd_hijack.model_hijack
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embedding = hijack.embedding_db.word_embeddings[embedding_name]
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embedding.vec.requires_grad = True
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losses = torch.zeros((32,))
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last_saved_file = "<none>"
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last_saved_image = "<none>"
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embedding_yet_to_be_embedded = False
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initial_step = embedding.step or 0
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if initial_step > steps:
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return embedding, filename
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scheduler = LearnRateScheduler(learn_rate, steps, initial_step)
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optimizer = torch.optim.AdamW([embedding.vec], lr=scheduler.learn_rate)
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if shared.opts.training_enable_tensorboard:
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tensorboard_writer = tensorboard_setup(log_directory)
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pbar = tqdm.tqdm(enumerate(ds), total=steps-initial_step)
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for i, entries in pbar:
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embedding.step = i + initial_step
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scheduler.apply(optimizer, embedding.step)
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if scheduler.finished:
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break
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if shared.state.interrupted:
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break
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with torch.autocast("cuda"):
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c = cond_model([entry.cond_text for entry in entries])
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x = torch.stack([entry.latent for entry in entries]).to(devices.device)
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loss = shared.sd_model(x, c)[0]
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del x
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losses[embedding.step % losses.shape[0]] = loss.item()
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optimizer.zero_grad()
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loss.backward()
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optimizer.step()
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epoch_num = embedding.step // len(ds)
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epoch_step = embedding.step - (epoch_num * len(ds)) + 1
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pbar.set_description(f"[Epoch {epoch_num}: {epoch_step}/{len(ds)}]loss: {losses.mean():.7f}")
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if embedding.step > 0 and embedding_dir is not None and embedding.step % save_embedding_every == 0:
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last_saved_file = os.path.join(embedding_dir, f'{embedding_name}-{embedding.step}.pt')
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embedding.save(last_saved_file)
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embedding_yet_to_be_embedded = True
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if shared.opts.training_enable_tensorboard:
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tensorboard_add(tensorboard_writer, loss=losses.mean(), global_step=embedding.step,
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step=epoch_step, learn_rate=scheduler.learn_rate, epoch_num=epoch_num)
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write_loss(log_directory, "textual_inversion_loss.csv", embedding.step, len(ds), {
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"loss": f"{losses.mean():.7f}",
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"learn_rate": scheduler.learn_rate
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})
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if embedding.step > 0 and images_dir is not None and embedding.step % create_image_every == 0:
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last_saved_image = os.path.join(images_dir, f'{embedding_name}-{embedding.step}.png')
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p = processing.StableDiffusionProcessingTxt2Img(
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sd_model=shared.sd_model,
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do_not_save_grid=True,
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do_not_save_samples=True,
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do_not_reload_embeddings=True,
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)
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if preview_from_txt2img:
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p.prompt = preview_prompt
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p.negative_prompt = preview_negative_prompt
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p.steps = preview_steps
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p.sampler_index = preview_sampler_index
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p.cfg_scale = preview_cfg_scale
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p.seed = preview_seed
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p.width = preview_width
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p.height = preview_height
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else:
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p.prompt = entries[0].cond_text
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p.steps = 20
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p.width = training_width
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p.height = training_height
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preview_text = p.prompt
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processed = processing.process_images(p)
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image = processed.images[0]
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shared.state.current_image = image
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if save_image_with_stored_embedding and os.path.exists(last_saved_file) and embedding_yet_to_be_embedded:
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last_saved_image_chunks = os.path.join(images_embeds_dir, f'{embedding_name}-{embedding.step}.png')
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info = PngImagePlugin.PngInfo()
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data = torch.load(last_saved_file)
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info.add_text("sd-ti-embedding", embedding_to_b64(data))
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title = "<{}>".format(data.get('name', '???'))
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try:
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vectorSize = list(data['string_to_param'].values())[0].shape[0]
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except Exception as e:
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vectorSize = '?'
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checkpoint = sd_models.select_checkpoint()
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footer_left = checkpoint.model_name
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footer_mid = '[{}]'.format(checkpoint.hash)
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footer_right = '{}v {}s'.format(vectorSize, embedding.step)
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captioned_image = caption_image_overlay(image, title, footer_left, footer_mid, footer_right)
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captioned_image = insert_image_data_embed(captioned_image, data)
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captioned_image.save(last_saved_image_chunks, "PNG", pnginfo=info)
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embedding_yet_to_be_embedded = False
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image.save(last_saved_image)
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if shared.opts.training_enable_tensorboard and shared.opts.training_tensorboard_save_images:
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tensorboard_add_image(tensorboard_writer, f"Validation at epoch {epoch_num}",
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image, embedding.step)
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last_saved_image += f", prompt: {preview_text}"
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shared.state.job_no = embedding.step
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shared.state.textinfo = f"""
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<p>
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Loss: {losses.mean():.7f}<br/>
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Step: {embedding.step}<br/>
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Last prompt: {html.escape(entries[0].cond_text)}<br/>
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Last saved embedding: {html.escape(last_saved_file)}<br/>
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Last saved image: {html.escape(last_saved_image)}<br/>
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</p>
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"""
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checkpoint = sd_models.select_checkpoint()
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embedding.sd_checkpoint = checkpoint.hash
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embedding.sd_checkpoint_name = checkpoint.model_name
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embedding.cached_checksum = None
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embedding.save(filename)
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return embedding, filename
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