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159 lines
4.3 KiB
159 lines
4.3 KiB
import numpy |
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import torch |
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from torch import Tensor |
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import argparse |
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from typing import Dict |
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from image_from_text import ( |
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load_dalle_bart_metadata, |
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tokenize, |
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detokenize_torch, |
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save_image, |
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ascii_from_image |
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) |
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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 load_params import ( |
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load_dalle_bart_flax_params, |
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convert_dalle_bart_torch_from_flax_params |
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) |
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parser = argparse.ArgumentParser() |
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parser.add_argument( |
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'--text', |
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help='text to generate image from', |
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type=str |
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) |
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parser.add_argument( |
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'--seed', |
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help='random seed', |
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type=int, |
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default=0 |
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) |
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parser.add_argument( |
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'--image_token_count', |
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help='image tokens to sample', |
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type=int, |
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default=256 |
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) |
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parser.add_argument( |
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'--image_path', |
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help='generated image path', |
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type=str, |
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default='generated.png' |
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) |
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parser.add_argument( |
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'--dalle_bart_path', |
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help='pretraied dalle bart path', |
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type=str, |
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default='./pretrained/dalle_bart_mini' |
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) |
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parser.add_argument( |
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'--vqgan_path', |
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help='pretraied vqgan path', |
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type=str, |
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default='./pretrained/vqgan' |
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) |
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def encode_torch( |
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text_tokens: numpy.ndarray, |
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config: dict, |
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params: dict |
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) -> Tensor: |
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print("loading torch encoder") |
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encoder = DalleBartEncoderTorch( |
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layer_count = config['encoder_layers'], |
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embed_count = config['d_model'], |
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attention_head_count = config['encoder_attention_heads'], |
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text_vocab_count = config['encoder_vocab_size'], |
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text_token_count = config['max_text_length'], |
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glu_embed_count = config['encoder_ffn_dim'] |
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) |
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encoder_params = convert_dalle_bart_torch_from_flax_params( |
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params.pop('encoder'), |
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layer_count=config['encoder_layers'], |
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is_encoder=True |
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) |
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encoder.load_state_dict(encoder_params, strict=False) |
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del encoder_params |
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print("encoding text tokens") |
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text_tokens = torch.tensor(text_tokens).to(torch.long) |
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encoder_state = encoder(text_tokens) |
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del encoder |
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return encoder_state |
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def decode_torch( |
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text_tokens: Tensor, |
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encoder_state: Tensor, |
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config: dict, |
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seed: int, |
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params: dict, |
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image_token_count: int |
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) -> Tensor: |
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print("loading torch decoder") |
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decoder = DalleBartDecoderTorch( |
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image_vocab_size = config['image_vocab_size'], |
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image_token_count = config['image_length'], |
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sample_token_count = image_token_count, |
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embed_count = config['d_model'], |
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attention_head_count = config['decoder_attention_heads'], |
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glu_embed_count = config['decoder_ffn_dim'], |
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layer_count = config['decoder_layers'], |
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batch_count = 2, |
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start_token = config['decoder_start_token_id'], |
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is_verbose = True |
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) |
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decoder_params = convert_dalle_bart_torch_from_flax_params( |
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params.pop('decoder'), |
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layer_count=config['decoder_layers'], |
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is_encoder=False |
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) |
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decoder.load_state_dict(decoder_params, strict=False) |
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del decoder_params |
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print("sampling image tokens") |
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torch.manual_seed(seed) |
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text_tokens = torch.tensor(text_tokens).to(torch.long) |
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image_tokens = decoder.forward(text_tokens, encoder_state) |
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return image_tokens |
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def generate_image_tokens_torch( |
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text: str, |
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seed: int, |
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image_token_count: int, |
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dalle_bart_path: str |
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) -> numpy.ndarray: |
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config, vocab, merges = load_dalle_bart_metadata(dalle_bart_path) |
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text_tokens = tokenize(text, config, vocab, merges) |
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params_dalle_bart = load_dalle_bart_flax_params(dalle_bart_path) |
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encoder_state = encode_torch(text_tokens, config, params_dalle_bart) |
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image_tokens = decode_torch( |
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text_tokens, |
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encoder_state, |
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config, seed, params_dalle_bart, |
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image_token_count |
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) |
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return image_tokens.detach().numpy() |
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if __name__ == '__main__': |
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args = parser.parse_args() |
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image_tokens = generate_image_tokens_torch( |
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args.text, |
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args.seed, |
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args.image_token_count, |
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args.dalle_bart_path |
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) |
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if args.image_token_count < 256: |
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print("image tokens", list(image_tokens, )) |
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else: |
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image = detokenize_torch(image_tokens, args.vqgan_path) |
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image = save_image(image, args.image_path) |
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print(ascii_from_image(image, size=128)) |
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