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| # ------------------------------------------------------------------------------------ | |
| # Minimal DALL-E | |
| # Copyright (c) 2021 KakaoBrain. All Rights Reserved. | |
| # Licensed under the Apache License, Version 2.0 [see LICENSE for details] | |
| # ------------------------------------------------------------------------------------ | |
| import os | |
| import random | |
| import urllib | |
| import hashlib | |
| import tarfile | |
| import torch | |
| import clip | |
| import numpy as np | |
| from PIL import Image | |
| from torch.nn import functional as F | |
| from tqdm import tqdm | |
| def set_seed(seed: int): | |
| random.seed(seed) | |
| np.random.seed(seed) | |
| torch.manual_seed(seed) | |
| torch.cuda.manual_seed_all(seed) | |
| def clip_score(prompt: str, | |
| images: np.ndarray, | |
| model_clip: torch.nn.Module, | |
| preprocess_clip, | |
| device: str) -> np.ndarray: | |
| images = [preprocess_clip(Image.fromarray((image*255).astype(np.uint8))) for image in images] | |
| images = torch.stack(images, dim=0).to(device=device) | |
| texts = clip.tokenize(prompt).to(device=device) | |
| texts = torch.repeat_interleave(texts, images.shape[0], dim=0) | |
| image_features = model_clip.encode_image(images) | |
| text_features = model_clip.encode_text(texts) | |
| scores = F.cosine_similarity(image_features, text_features).squeeze() | |
| rank = torch.argsort(scores, descending=True).cpu().numpy() | |
| return rank | |
| def download(url: str, root: str) -> str: | |
| os.makedirs(root, exist_ok=True) | |
| filename = os.path.basename(url) | |
| pathname = filename[:-len('.tar.gz')] | |
| expected_md5 = url.split("/")[-2] | |
| download_target = os.path.join(root, filename) | |
| result_path = os.path.join(root, pathname) | |
| if os.path.isfile(download_target) and (os.path.exists(result_path) and not os.path.isfile(result_path)): | |
| return result_path | |
| with urllib.request.urlopen(url) as source, open(download_target, 'wb') as output: | |
| with tqdm(total=int(source.info().get('Content-Length')), ncols=80, unit='iB', unit_scale=True, | |
| unit_divisor=1024) as loop: | |
| while True: | |
| buffer = source.read(8192) | |
| if not buffer: | |
| break | |
| output.write(buffer) | |
| loop.update(len(buffer)) | |
| if hashlib.md5(open(download_target, 'rb').read()).hexdigest() != expected_md5: | |
| raise RuntimeError(f'Model has been downloaded but the md5 checksum does not not match') | |
| with tarfile.open(download_target, 'r:gz') as f: | |
| pbar = tqdm(f.getmembers(), total=len(f.getmembers())) | |
| for member in pbar: | |
| pbar.set_description(f'extracting: {member.name} (size:{member.size // (1024 * 1024)}MB)') | |
| f.extract(member=member, path=root) | |
| return result_path | |
| def realpath_url_or_path(url_or_path: str, root: str = None) -> str: | |
| if urllib.parse.urlparse(url_or_path).scheme in ('http', 'https'): | |
| return download(url_or_path, root) | |
| return url_or_path | |