import os from PIL import Image import numpy from torch import LongTensor import torch import json import requests from typing import Iterator torch.set_grad_enabled(False) torch.set_num_threads(os.cpu_count()) from .text_tokenizer import TextTokenizer from .models import DalleBartEncoder, DalleBartDecoder, VQGanDetokenizer MIN_DALLE_REPO = 'https://huggingface.co/kuprel/min-dalle/resolve/main/' class MinDalle: def __init__( self, models_root: str = 'pretrained', dtype: torch.dtype = torch.float32, is_mega: bool = True, is_reusable: bool = True, is_verbose = True ): 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' 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 ).to(self.dtype).eval() params = torch.load(self.encoder_params_path) self.encoder.load_state_dict(params, strict=False) del params if torch.cuda.is_available(): self.encoder = self.encoder.cuda() 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, start_token = self.image_vocab_count ).to(self.dtype).eval() params = torch.load(self.decoder_params_path) self.decoder.load_state_dict(params, strict=False) del params if torch.cuda.is_available(): self.decoder = self.decoder.cuda() 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 if torch.cuda.is_available(): self.detokenizer = self.detokenizer.cuda() def image_from_tokens( self, grid_size: int, image_tokens: LongTensor, is_verbose: bool = False ) -> Image.Image: if not self.is_reusable: del self.decoder if torch.cuda.is_available(): torch.cuda.empty_cache() if not self.is_reusable: self.init_detokenizer() if is_verbose: print("detokenizing image") images = self.detokenizer.forward(image_tokens).to(torch.uint8) if not self.is_reusable: del self.detokenizer images = images.reshape([grid_size] * 2 + list(images.shape[1:])) image = images.flatten(1, 2).transpose(0, 1).flatten(1, 2) image = Image.fromarray(image.to('cpu').detach().numpy()) return image def generate_image_stream( self, text: str, seed: int, grid_size: int, log2_mid_count: int, log2_k: int = 6, log2_supercondition_factor: int = 3, is_verbose: bool = False ) -> Iterator[Image.Image]: assert(log2_mid_count in range(5)) 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", 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).to(torch.long) if torch.cuda.is_available(): text_tokens = text_tokens.cuda() 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 if torch.cuda.is_available(): torch.cuda.empty_cache() if not self.is_reusable: self.init_decoder() with torch.cuda.amp.autocast(dtype=self.dtype): encoder_state, attention_mask, attention_state, image_tokens = ( self.decoder.decode_initial( seed, grid_size ** 2, text_tokens, encoder_state ) ) row_count = 16 for row_index in range(row_count): if is_verbose: print('sampling row {} of {}'.format(row_index + 1, row_count)) with torch.cuda.amp.autocast(dtype=self.dtype): attention_state, image_tokens = self.decoder.decode_row( row_index, log2_k, log2_supercondition_factor, encoder_state, attention_mask, attention_state, image_tokens ) with torch.cuda.amp.autocast(dtype=torch.float32): if ((row_index + 1) * (2 ** log2_mid_count)) % row_count == 0: tokens = image_tokens[:, 1:] image = self.image_from_tokens(grid_size, tokens, is_verbose) yield image def generate_image( self, text: str, seed: int = -1, grid_size: int = 1, log2_k: int = 6, log2_supercondition_factor: int = 3, is_verbose: bool = False ) -> Image.Image: log2_mid_count = 0 image_stream = self.generate_image_stream( text, seed, grid_size, log2_mid_count, log2_k, log2_supercondition_factor, is_verbose ) return next(image_stream)