v1.0

util/datasets.py

@@ -0,0 +1,60 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+
+# This source code is licensed under the license found in the
+# LICENSE file in the root directory of this source tree.
+# --------------------------------------------------------
+# References:
+# DeiT: https://github.com/facebookresearch/deit
+# --------------------------------------------------------
+
+import os
+import PIL
+from torchvision import datasets, transforms
+from timm.data import create_transform
+from timm.data.constants import IMAGENET_DEFAULT_MEAN, IMAGENET_DEFAULT_STD
+
+
+def build_dataset(is_train, args):
+    
+    transform = build_transform(is_train, args)
+    root = os.path.join(args.data_path, is_train)
+    dataset = datasets.ImageFolder(root, transform=transform)
+
+    return dataset
+
+
+def build_transform(is_train, args):
+    mean = IMAGENET_DEFAULT_MEAN
+    std = IMAGENET_DEFAULT_STD
+    # train transform
+    if is_train=='train':
+        # this should always dispatch to transforms_imagenet_train
+        transform = create_transform(
+            input_size=args.input_size,
+            is_training=True,
+            color_jitter=args.color_jitter,
+            auto_augment=args.aa,
+            interpolation='bicubic',
+            re_prob=args.reprob,
+            re_mode=args.remode,
+            re_count=args.recount,
+            mean=mean,
+            std=std,
+        )
+        return transform
+
+    # eval transform
+    t = []
+    if args.input_size <= 224:
+        crop_pct = 224 / 256
+    else:
+        crop_pct = 1.0
+    size = int(args.input_size / crop_pct)
+    t.append(
+        transforms.Resize(size, interpolation=transforms.InterpolationMode.BICUBIC), 
+    )
+    t.append(transforms.CenterCrop(args.input_size))
+    t.append(transforms.ToTensor())
+    t.append(transforms.Normalize(mean, std))
+    return transforms.Compose(t)