从ImageNet-1k制作ImageNet-Subset

# -*- coding: utf-8 -*-
"""
Create a subset of the ImageNet-1k dataset.
"""
import os
import numpy as np
import torchvision.datasets as datasets
 
SUBSET_SIZE = 100
seed = 1993
SOURCE_PATH = "/dataset/ImageNet-1k"
TARGET_SIZE = f"/dataset/ImageNet-{SUBSET_SIZE}_seed{seed}"
 
# Data loading code
train_dataset = datasets.ImageNet(SOURCE_PATH, split="train")
classes = train_dataset.wnids
 
# Randomly select a subset of classes
np.random.seed(seed)
subset_classes = np.random.choice(classes, SUBSET_SIZE, replace=False)
subset_classes.sort()
print("the number of subset classes: {}".format(len(subset_classes)))
print(subset_classes)
 
# Create links to the subset folder
source_train_dir = os.path.join(SOURCE_PATH, "train")
source_val_dir = os.path.join(SOURCE_PATH, "val")
output_train_dir = os.path.join(TARGET_SIZE, "train")
output_val_dir = os.path.join(TARGET_SIZE, "val")
os.makedirs(output_train_dir, exist_ok=True)
os.makedirs(output_val_dir, exist_ok=True)
 
for cls in subset_classes:
    os.symlink(os.path.join(source_train_dir, cls), os.path.join(output_train_dir, cls))
    os.symlink(os.path.join(source_val_dir, cls), os.path.join(output_val_dir, cls))
 
print("Done!")