135 lines
5.2 KiB
Python
135 lines
5.2 KiB
Python
import os
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from PIL import Image
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from typing import Dict
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import numpy
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from torch import LongTensor
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import torch
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import json
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torch.set_grad_enabled(False)
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torch.set_num_threads(os.cpu_count())
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from .text_tokenizer import TextTokenizer
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from .models.dalle_bart_encoder_torch import DalleBartEncoderTorch
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from .models.dalle_bart_decoder_torch import DalleBartDecoderTorch
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from .models.vqgan_detokenizer import VQGanDetokenizer
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class MinDalleTorch:
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def __init__(
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self,
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is_mega: bool,
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is_reusable: bool = True,
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sample_token_count: int = 256
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):
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print("initializing MinDalleTorch")
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self.is_reusable = is_reusable
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self.sample_token_count = sample_token_count
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self.batch_count = 2
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self.text_token_count = 64
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self.image_token_count = 256
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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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self.model_path = os.path.join('pretrained', model_name)
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self.encoder_params_path = os.path.join(self.model_path, 'encoder.pt')
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self.decoder_params_path = os.path.join(self.model_path, 'decoder.pt')
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self.detoker_params_path = os.path.join('pretrained', 'vqgan', '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 init_tokenizer(self):
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print("reading files from {}".format(self.model_path))
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vocab_path = os.path.join(self.model_path, 'vocab.json')
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merges_path = os.path.join(self.model_path, 'merges.txt')
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with open(vocab_path, 'r', encoding='utf8') as f:
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vocab = json.load(f)
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with open(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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print("initializing DalleBartEncoderTorch")
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self.encoder = DalleBartEncoderTorch(
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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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)
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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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if torch.cuda.is_available(): self.encoder = self.encoder.cuda()
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def init_decoder(self):
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print("initializing DalleBartDecoderTorch")
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self.decoder = DalleBartDecoderTorch(
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sample_token_count = self.sample_token_count,
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image_token_count = self.image_token_count,
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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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start_token = self.image_vocab_count,
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batch_count = self.batch_count
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)
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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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if torch.cuda.is_available(): self.decoder = self.decoder.cuda()
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def init_detokenizer(self):
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print("initializing VQGanDetokenizer")
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self.detokenizer = VQGanDetokenizer()
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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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if torch.cuda.is_available(): self.detokenizer = self.detokenizer.cuda()
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def generate_image_tokens(self, text: str, seed: int) -> LongTensor:
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print("tokenizing text")
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tokens = self.tokenizer.tokenize(text)
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print("text 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(text_tokens).to(torch.long)
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if torch.cuda.is_available(): text_tokens = text_tokens.cuda()
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if not self.is_reusable: self.init_encoder()
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print("encoding text tokens")
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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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if not self.is_reusable: self.init_decoder()
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print("sampling image tokens")
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torch.manual_seed(seed)
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image_tokens = self.decoder.forward(text_tokens, encoder_state)
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if not self.is_reusable: del self.decoder
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return image_tokens
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def generate_image(self, text: str, seed: int) -> Image.Image:
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image_tokens = self.generate_image_tokens(text, seed)
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if not self.is_reusable: self.init_detokenizer()
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print("detokenizing image")
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image = self.detokenizer.forward(image_tokens).to(torch.uint8)
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if not self.is_reusable: del self.detokenizer
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image = Image.fromarray(image.to('cpu').detach().numpy())
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return image |