Create resize.py

resize.py

@@ -0,0 +1,93 @@
+from io import BytesIO
+
+import ujson
+import webdataset as wds
+from PIL import Image
+from tqdm import tqdm
+import os
+import albumentations as A
+import cv2
+def load_text(txt: bytes):
+    return txt.decode()
+
+
+def load_image(jpg):
+    return Image.open(BytesIO(jpg)).convert('RGB')
+
+
+load_mapping = {
+    'jpg': load_image,
+    'txt': load_text
+}
+
+
+def valid_image(img):
+    return min(img.size) >= 64
+
+
+def resize_img(img, max_size=224):
+    width, height = img.size
+
+    if max(width,height) > max_size:
+        if width < height:
+            new_height = max_size
+            new_width = int(max_size * width / height)
+        else:
+            new_width = max_size
+            new_height = int(max_size * height / width)
+        img = img.resize((new_width, new_height), Image.BICUBIC)
+
+    # Pad the image to make it square
+    width, height = img.size
+    new_img = Image.new("RGB", (max_size, max_size), (255, 255, 255))
+    new_img.paste(img, ((max_size - width) // 2, (max_size - height) // 2))
+
+    return new_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
+
+    img=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 = {
+    '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(
+        'jpg', 'txt')
+    dl = wds.WebLoader(ds, batch_size=None, num_workers=48, prefetch_factor=16, **kwargs)
+
+
+    writer = wds.ShardWriter('target_path/%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('path_to_origin_data')