| from io import BytesIO | |
| import ujson | |
| import webdataset as wds | |
| from PIL import Image | |
| from tqdm import tqdm | |
| def load_text(txt: bytes): | |
| return txt.decode() | |
| def load_image(jpg): | |
| return Image.open(BytesIO(jpg)).convert('RGB') | |
| load_mapping = { | |
| 'input.jpg': load_image, | |
| 'output.txt': load_text | |
| } | |
| def valid_image(img): | |
| return min(img.size) >= 64 | |
| def resize_img(img, max_size=512): | |
| width, height = img.size | |
| if width < max_size and height < max_size: | |
| return img | |
| if width > height: | |
| new_width = max_size | |
| new_height = int(new_width * height / width) | |
| elif height > width: | |
| new_height = max_size | |
| new_width = int(new_height * width / height) | |
| else: | |
| new_height = new_width = max_size | |
| img = img.resize((new_width, new_height), Image.ANTIALIAS) | |
| return img | |
| def img_to_meta(img): | |
| width, height = img.size | |
| return { | |
| 'width': width, | |
| 'height': height | |
| } | |
| def get_image(img): | |
| if not valid_image(img): | |
| return None, None | |
| resize_img(img) | |
| img_stream = BytesIO() | |
| img.save(img_stream, format='jpeg') | |
| img_stream.seek(0) | |
| return img_stream.read(), ujson.dumps(img_to_meta(img)) | |
| change_mapping = { | |
| 'input.jpg': get_image | |
| } | |
| def func(wds_dataset_str, **kwargs): | |
| ds = wds.WebDataset(wds_dataset_str, shardshuffle=False).map_dict(**load_mapping).map_dict(**change_mapping).to_tuple( | |
| 'input.jpg', 'output.txt') | |
| dl = wds.WebLoader(ds, batch_size=None, num_workers=48, prefetch_factor=16, **kwargs) | |
| writer = wds.ShardWriter('%05d.tar', 10000) | |
| for img, txt in tqdm(dl): | |
| img_str, meta = img | |
| if img_str is None: | |
| continue | |
| sample = { | |
| '__key__': f'{writer.count:08}', | |
| 'jpg': img_str, | |
| 'txt': txt, | |
| 'json': meta | |
| } | |
| writer.write(sample) | |
| if __name__ == '__main__': | |
| func('../conceptual-captions-12m-webdataset/{0..127}/{00000..4}.tar') | |