288 lines
11 KiB
Python
288 lines
11 KiB
Python
import os
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from PIL import Image
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import numpy
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from torch import LongTensor, FloatTensor
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from math import sqrt
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import torch
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import torch.backends.cudnn, torch.backends.cuda
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import json
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import requests
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from typing import Iterator
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from .text_tokenizer import TextTokenizer
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from .models import DalleBartEncoder, DalleBartDecoder, VQGanDetokenizer
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torch.set_grad_enabled(False)
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torch.set_num_threads(os.cpu_count())
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torch.backends.cudnn.enabled = True
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torch.backends.cudnn.allow_tf32 = True
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torch.backends.cudnn.benchmark = True
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torch.backends.cuda.matmul.allow_tf32 = True
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torch.backends.cuda.matmul.allow_fp16_reduced_precision_reduction = True
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MIN_DALLE_REPO = 'https://huggingface.co/kuprel/min-dalle/resolve/main/'
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IMAGE_TOKEN_COUNT = 256
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class MinDalle:
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def __init__(
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self,
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models_root: str = 'pretrained',
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dtype: torch.dtype = torch.float32,
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device: str = None,
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is_mega: bool = True,
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is_reusable: bool = True,
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is_verbose = True
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):
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if device == None:
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device = 'cuda' if torch.cuda.is_available() else 'cpu'
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if is_verbose: print("using device", device)
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self.device = device
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self.is_mega = is_mega
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self.is_reusable = is_reusable
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self.dtype = dtype
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self.is_verbose = is_verbose
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self.text_token_count = 64
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self.layer_count = 24 if is_mega else 12
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self.attention_head_count = 32 if is_mega else 16
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self.embed_count = 2048 if is_mega else 1024
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self.glu_embed_count = 4096 if is_mega else 2730
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self.text_vocab_count = 50272 if is_mega else 50264
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self.image_vocab_count = 16415 if is_mega else 16384
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model_name = 'dalle_bart_{}'.format('mega' if is_mega else 'mini')
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dalle_path = os.path.join(models_root, model_name)
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vqgan_path = os.path.join(models_root, 'vqgan')
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if not os.path.exists(dalle_path): os.makedirs(dalle_path)
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if not os.path.exists(vqgan_path): os.makedirs(vqgan_path)
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self.vocab_path = os.path.join(dalle_path, 'vocab.json')
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self.merges_path = os.path.join(dalle_path, 'merges.txt')
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self.encoder_params_path = os.path.join(dalle_path, 'encoder.pt')
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self.decoder_params_path = os.path.join(dalle_path, 'decoder.pt')
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self.detoker_params_path = os.path.join(vqgan_path, 'detoker.pt')
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self.init_tokenizer()
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if is_reusable:
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self.init_encoder()
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self.init_decoder()
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self.init_detokenizer()
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def download_tokenizer(self):
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if self.is_verbose: print("downloading tokenizer params")
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suffix = '' if self.is_mega else '_mini'
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vocab = requests.get(MIN_DALLE_REPO + 'vocab{}.json'.format(suffix))
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merges = requests.get(MIN_DALLE_REPO + 'merges{}.txt'.format(suffix))
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with open(self.vocab_path, 'wb') as f: f.write(vocab.content)
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with open(self.merges_path, 'wb') as f: f.write(merges.content)
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def download_encoder(self):
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if self.is_verbose: print("downloading encoder params")
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suffix = '' if self.is_mega else '_mini'
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params = requests.get(MIN_DALLE_REPO + 'encoder{}.pt'.format(suffix))
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with open(self.encoder_params_path, 'wb') as f: f.write(params.content)
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def download_decoder(self):
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if self.is_verbose: print("downloading decoder params")
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suffix = '' if self.is_mega else '_mini'
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params = requests.get(MIN_DALLE_REPO + 'decoder{}.pt'.format(suffix))
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with open(self.decoder_params_path, 'wb') as f: f.write(params.content)
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def download_detokenizer(self):
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if self.is_verbose: print("downloading detokenizer params")
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params = requests.get(MIN_DALLE_REPO + 'detoker.pt')
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with open(self.detoker_params_path, 'wb') as f: f.write(params.content)
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def init_tokenizer(self):
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is_downloaded = os.path.exists(self.vocab_path)
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is_downloaded &= os.path.exists(self.merges_path)
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if not is_downloaded: self.download_tokenizer()
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if self.is_verbose: print("intializing TextTokenizer")
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with open(self.vocab_path, 'r', encoding='utf8') as f:
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vocab = json.load(f)
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with open(self.merges_path, 'r', encoding='utf8') as f:
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merges = f.read().split("\n")[1:-1]
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self.tokenizer = TextTokenizer(vocab, merges)
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def init_encoder(self):
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is_downloaded = os.path.exists(self.encoder_params_path)
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if not is_downloaded: self.download_encoder()
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if self.is_verbose: print("initializing DalleBartEncoder")
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self.encoder = DalleBartEncoder(
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attention_head_count = self.attention_head_count,
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embed_count = self.embed_count,
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glu_embed_count = self.glu_embed_count,
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text_token_count = self.text_token_count,
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text_vocab_count = self.text_vocab_count,
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layer_count = self.layer_count,
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device=self.device
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).to(self.dtype).eval()
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params = torch.load(self.encoder_params_path)
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self.encoder.load_state_dict(params, strict=False)
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del params
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self.encoder = self.encoder.to(device=self.device)
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def init_decoder(self):
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is_downloaded = os.path.exists(self.decoder_params_path)
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if not is_downloaded: self.download_decoder()
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if self.is_verbose: print("initializing DalleBartDecoder")
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self.decoder = DalleBartDecoder(
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image_vocab_count = self.image_vocab_count,
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attention_head_count = self.attention_head_count,
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embed_count = self.embed_count,
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glu_embed_count = self.glu_embed_count,
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layer_count = self.layer_count,
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device=self.device
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).to(self.dtype).eval()
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params = torch.load(self.decoder_params_path)
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self.decoder.load_state_dict(params, strict=False)
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del params
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self.decoder = self.decoder.to(device=self.device)
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def init_detokenizer(self):
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is_downloaded = os.path.exists(self.detoker_params_path)
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if not is_downloaded: self.download_detokenizer()
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if self.is_verbose: print("initializing VQGanDetokenizer")
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self.detokenizer = VQGanDetokenizer().eval()
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params = torch.load(self.detoker_params_path)
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self.detokenizer.load_state_dict(params)
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del params
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self.detokenizer = self.detokenizer.to(device=self.device)
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def image_grid_from_tokens(
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self,
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image_tokens: LongTensor,
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is_seamless: bool,
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is_verbose: bool = False
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) -> FloatTensor:
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if not self.is_reusable: del self.decoder
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torch.cuda.empty_cache()
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if not self.is_reusable: self.init_detokenizer()
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if is_verbose: print("detokenizing image")
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images = self.detokenizer.forward(is_seamless, image_tokens)
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if not self.is_reusable: del self.detokenizer
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return images
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def generate_raw_image_stream(
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self,
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text: str,
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seed: int,
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grid_size: int,
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progressive_outputs: bool = False,
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is_seamless: bool = False,
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temperature: float = 1,
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top_k: int = 256,
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supercondition_factor: int = 16,
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is_verbose: bool = False
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) -> Iterator[FloatTensor]:
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image_count = grid_size ** 2
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if is_verbose: print("tokenizing text")
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tokens = self.tokenizer.tokenize(text, is_verbose=is_verbose)
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if len(tokens) > self.text_token_count:
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tokens = tokens[:self.text_token_count]
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if is_verbose: print("{} text tokens".format(len(tokens)), tokens)
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text_tokens = numpy.ones((2, 64), dtype=numpy.int32)
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text_tokens[0, :2] = [tokens[0], tokens[-1]]
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text_tokens[1, :len(tokens)] = tokens
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text_tokens = torch.tensor(
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text_tokens,
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dtype=torch.long,
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device=self.device
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)
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if not self.is_reusable: self.init_encoder()
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if is_verbose: print("encoding text tokens")
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with torch.cuda.amp.autocast(dtype=self.dtype):
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encoder_state = self.encoder.forward(text_tokens)
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if not self.is_reusable: del self.encoder
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torch.cuda.empty_cache()
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if not self.is_reusable: self.init_decoder()
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with torch.cuda.amp.autocast(dtype=self.dtype):
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expanded_indices = [0] * image_count + [1] * image_count
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text_tokens = text_tokens[expanded_indices]
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encoder_state = encoder_state[expanded_indices]
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attention_mask = text_tokens.not_equal(1)
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attention_state = torch.zeros(
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size=(
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self.layer_count,
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image_count * 4,
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IMAGE_TOKEN_COUNT,
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self.embed_count
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),
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device=self.device
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)
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image_tokens = torch.full(
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(IMAGE_TOKEN_COUNT + 1, image_count),
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self.image_vocab_count,
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dtype=torch.long,
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device=self.device
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)
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if seed > 0: torch.manual_seed(seed)
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token_indices = torch.arange(IMAGE_TOKEN_COUNT, device=self.device)
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settings = torch.tensor(
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[temperature, top_k, supercondition_factor],
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dtype=torch.float32,
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device=self.device
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)
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for i in range(IMAGE_TOKEN_COUNT):
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with torch.cuda.amp.autocast(dtype=self.dtype):
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image_tokens[i + 1], attention_state = self.decoder.forward(
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settings=settings,
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attention_mask=attention_mask,
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encoder_state=encoder_state,
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attention_state=attention_state,
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prev_tokens=image_tokens[i],
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token_index=token_indices[[i]]
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)
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with torch.cuda.amp.autocast(dtype=torch.float32):
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if ((i + 1) % 32 == 0 and progressive_outputs) or i + 1 == 256:
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yield self.image_grid_from_tokens(
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image_tokens=image_tokens[1:].T,
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is_seamless=is_seamless,
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is_verbose=is_verbose
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)
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def generate_image_stream(self, *args, **kwargs) -> Iterator[Image.Image]:
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image_stream = self.generate_raw_image_stream(*args, **kwargs)
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for image in image_stream:
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image = image.to(torch.uint8).to('cpu').numpy()
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yield Image.fromarray(image)
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def generate_images_stream(self, *args, **kwargs) -> Iterator[FloatTensor]:
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image_stream = self.generate_raw_image_stream(*args, **kwargs)
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for image in image_stream:
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grid_size = kwargs['grid_size']
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image = image.view([grid_size * 256, grid_size, 256, 3])
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image = image.transpose(1, 0)
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image = image.reshape([grid_size ** 2, 2 ** 8, 2 ** 8, 3])
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yield image
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def generate_image(self, *args, **kwargs) -> Image.Image:
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image_stream = self.generate_image_stream(
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*args, **kwargs,
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progressive_outputs=False
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)
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return next(image_stream)
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def generate_images(self, *args, **kwargs) -> Image.Image:
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images_stream = self.generate_images_stream(
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*args, **kwargs,
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progressive_outputs=False
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)
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return next(images_stream) |