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# 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, "train" if is_train else "val")
dataset = datasets.ImageFolder(root, transform=transform)
print(dataset)
return dataset
def build_transform(is_train, args):
mean = IMAGENET_DEFAULT_MEAN
std = IMAGENET_DEFAULT_STD
# train transform
if is_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=PIL.Image.BICUBIC
), # to maintain same ratio w.r.t. 224 images
)
t.append(transforms.CenterCrop(args.input_size))
t.append(transforms.ToTensor())
t.append(transforms.Normalize(mean, std))
return transforms.Compose(t)
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