import os from PIL import Image import numpy from torch import LongTensor, FloatTensor import torch import torch.backends.cudnn, torch.backends.cuda import json import requests from typing import Iterator from .text_tokenizer import TextTokenizer from .models import DalleBartEncoder, DalleBartDecoder, VQGanDetokenizer import streamlit as st torch.set_grad_enabled(False) torch.set_num_threads(os.cpu_count()) torch.backends.cudnn.enabled = True torch.backends.cudnn.allow_tf32 = True MIN_DALLE_REPO = 'https://huggingface.co/kuprel/min-dalle/resolve/main/' IMAGE_TOKEN_COUNT = 256 class MinDalle: def __init__( self, models_root: str = 'pretrained', dtype: torch.dtype = torch.float32, device: str = None, is_mega: bool = True, is_reusable: bool = True, is_verbose = True ): if device == None: device = 'cuda' if torch.cuda.is_available() else 'cpu' if is_verbose: print("using device", device) self.device = device self.is_mega = is_mega self.is_reusable = is_reusable self.dtype = dtype self.is_verbose = is_verbose self.text_token_count = 64 self.layer_count = 24 if is_mega else 12 self.attention_head_count = 32 if is_mega else 16 self.embed_count = 2048 if is_mega else 1024 self.glu_embed_count = 4096 if is_mega else 2730 self.text_vocab_count = 50272 if is_mega else 50264 self.image_vocab_count = 16415 if is_mega else 16384 model_name = 'dalle_bart_{}'.format('mega' if is_mega else 'mini') dalle_path = os.path.join(models_root, model_name) vqgan_path = os.path.join(models_root, 'vqgan') if not os.path.exists(dalle_path): os.makedirs(dalle_path) if not os.path.exists(vqgan_path): os.makedirs(vqgan_path) self.vocab_path = os.path.join(dalle_path, 'vocab.json') self.merges_path = os.path.join(dalle_path, 'merges.txt') self.encoder_params_path = os.path.join(dalle_path, 'encoder.pt') self.decoder_params_path = os.path.join(dalle_path, 'decoder.pt') self.detoker_params_path = os.path.join(vqgan_path, 'detoker.pt') self.init_tokenizer() if is_reusable: self.init_encoder() self.init_decoder() self.init_detokenizer() def download_tokenizer(self): if self.is_verbose: print("downloading tokenizer params") suffix = '' if self.is_mega else '_mini' _ = requests.get(MIN_DALLE_REPO + 'config.json') # trigger HF download vocab = requests.get(MIN_DALLE_REPO + 'vocab{}.json'.format(suffix)) merges = requests.get(MIN_DALLE_REPO + 'merges{}.txt'.format(suffix)) with open(self.vocab_path, 'wb') as f: f.write(vocab.content) with open(self.merges_path, 'wb') as f: f.write(merges.content) def download_encoder(self): if self.is_verbose: print("downloading encoder params") suffix = '' if self.is_mega else '_mini' params = requests.get(MIN_DALLE_REPO + 'encoder{}.pt'.format(suffix)) with open(self.encoder_params_path, 'wb') as f: f.write(params.content) def download_decoder(self): if self.is_verbose: print("downloading decoder params") suffix = '' if self.is_mega else '_mini' params = requests.get(MIN_DALLE_REPO + 'decoder{}.pt'.format(suffix)) with open(self.decoder_params_path, 'wb') as f: f.write(params.content) def download_detokenizer(self): if self.is_verbose: print("downloading detokenizer params") params = requests.get(MIN_DALLE_REPO + 'detoker.pt') with open(self.detoker_params_path, 'wb') as f: f.write(params.content) def init_tokenizer(self): is_downloaded = os.path.exists(self.vocab_path) is_downloaded &= os.path.exists(self.merges_path) if not is_downloaded: self.download_tokenizer() if self.is_verbose: print("intializing TextTokenizer") with open(self.vocab_path, 'r', encoding='utf8') as f: vocab = json.load(f) with open(self.merges_path, 'r', encoding='utf8') as f: merges = f.read().split("\n")[1:-1] self.tokenizer = TextTokenizer(vocab, merges) def init_encoder(self): is_downloaded = os.path.exists(self.encoder_params_path) if not is_downloaded: self.download_encoder() if self.is_verbose: print("initializing DalleBartEncoder") self.encoder = DalleBartEncoder( attention_head_count = self.attention_head_count, embed_count = self.embed_count, glu_embed_count = self.glu_embed_count, text_token_count = self.text_token_count, text_vocab_count = self.text_vocab_count, layer_count = self.layer_count, device=self.device ).to(self.dtype).eval() params = torch.load(self.encoder_params_path) self.encoder.load_state_dict(params, strict=False) del params self.encoder = self.encoder.to(device=self.device) def init_decoder(self): is_downloaded = os.path.exists(self.decoder_params_path) if not is_downloaded: self.download_decoder() if self.is_verbose: print("initializing DalleBartDecoder") self.decoder = DalleBartDecoder( image_vocab_count = self.image_vocab_count, attention_head_count = self.attention_head_count, embed_count = self.embed_count, glu_embed_count = self.glu_embed_count, layer_count = self.layer_count, device=self.device ).to(self.dtype).eval() params = torch.load(self.decoder_params_path) self.decoder.load_state_dict(params, strict=False) del params self.decoder = self.decoder.to(device=self.device) def init_detokenizer(self): is_downloaded = os.path.exists(self.detoker_params_path) if not is_downloaded: self.download_detokenizer() if self.is_verbose: print("initializing VQGanDetokenizer") self.detokenizer = VQGanDetokenizer().eval() params = torch.load(self.detoker_params_path) self.detokenizer.load_state_dict(params) del params self.detokenizer = self.detokenizer.to(device=self.device) def image_grid_from_tokens( self, image_tokens: LongTensor, is_seamless: bool, is_verbose: bool = False ) -> FloatTensor: if not self.is_reusable: del self.decoder torch.cuda.empty_cache() if not self.is_reusable: self.init_detokenizer() if is_verbose: print("detokenizing image") images = self.detokenizer.forward(is_seamless, image_tokens) if not self.is_reusable: del self.detokenizer return images def generate_raw_image_stream( self, text: str, seed: int, grid_size: int, progressive_outputs: bool = False, is_seamless: bool = False, temperature: float = 1, top_k: int = 256, supercondition_factor: int = 16, is_verbose: bool = False ) -> Iterator[FloatTensor]: image_count = grid_size ** 2 if is_verbose: print("tokenizing text") tokens = self.tokenizer.tokenize(text, is_verbose=is_verbose) if len(tokens) > self.text_token_count: tokens = tokens[:self.text_token_count] if is_verbose: print("{} text tokens".format(len(tokens)), tokens) text_tokens = numpy.ones((2, 64), dtype=numpy.int32) text_tokens[0, :2] = [tokens[0], tokens[-1]] text_tokens[1, :len(tokens)] = tokens text_tokens = torch.tensor( text_tokens, dtype=torch.long, device=self.device ) if not self.is_reusable: self.init_encoder() if is_verbose: print("encoding text tokens") with torch.cuda.amp.autocast(dtype=self.dtype): encoder_state = self.encoder.forward(text_tokens) if not self.is_reusable: del self.encoder torch.cuda.empty_cache() if not self.is_reusable: self.init_decoder() with torch.cuda.amp.autocast(dtype=self.dtype): expanded_indices = [0] * image_count + [1] * image_count text_tokens = text_tokens[expanded_indices] encoder_state = encoder_state[expanded_indices] attention_mask = text_tokens.not_equal(1) attention_state = torch.zeros( size=( self.layer_count, image_count * 4, IMAGE_TOKEN_COUNT, self.embed_count ), device=self.device ) image_tokens = torch.full( (IMAGE_TOKEN_COUNT + 1, image_count), self.image_vocab_count, dtype=torch.long, device=self.device ) if seed > 0: torch.manual_seed(seed) token_indices = torch.arange(IMAGE_TOKEN_COUNT, device=self.device) settings = torch.tensor( [temperature, top_k, supercondition_factor], dtype=torch.float32, device=self.device ) for i in range(IMAGE_TOKEN_COUNT): if(st.session_state.page != 0): break st.session_state.bar.progress(i/IMAGE_TOKEN_COUNT) torch.cuda.empty_cache() with torch.cuda.amp.autocast(dtype=self.dtype): image_tokens[i + 1], attention_state = self.decoder.forward( settings=settings, attention_mask=attention_mask, encoder_state=encoder_state, attention_state=attention_state, prev_tokens=image_tokens[i], token_index=token_indices[[i]] ) with torch.cuda.amp.autocast(dtype=torch.float32): if ((i + 1) % 32 == 0 and progressive_outputs) or i + 1 == 256: yield self.image_grid_from_tokens( image_tokens=image_tokens[1:].T, is_seamless=is_seamless, is_verbose=is_verbose ) def generate_image_stream(self, *args, **kwargs) -> Iterator[Image.Image]: image_stream = self.generate_raw_image_stream(*args, **kwargs) for image in image_stream: image = image.to(torch.uint8).to('cpu').numpy() yield Image.fromarray(image) def generate_images_stream(self, *args, **kwargs) -> Iterator[FloatTensor]: image_stream = self.generate_raw_image_stream(*args, **kwargs) for image in image_stream: grid_size = kwargs['grid_size'] image = image.view([grid_size * 256, grid_size, 256, 3]) image = image.transpose(1, 0) image = image.reshape([grid_size ** 2, 2 ** 8, 2 ** 8, 3]) yield image def generate_image(self, *args, **kwargs) -> Image.Image: image_stream = self.generate_image_stream( *args, **kwargs, progressive_outputs=False ) return next(image_stream) def generate_images(self, *args, **kwargs) -> Image.Image: images_stream = self.generate_images_stream( *args, **kwargs, progressive_outputs=False ) return next(images_stream)