原數據集形式，收集的數據來源包括兩個folder, 數據分為三類（class1-3)
希望得到的數據集形式： 將數據集拆分為train和test兩部分，每部分都包含所有類別。
完整代碼（已包含注釋，自測可用，參考文獻：數據集划分、label生成及按label將圖片分類到不同文件夾）：
1 import os 2 # import cv2
3 import random 4 import sys 5 from random import randint 6 import shutil 7
8 def fileExist(path1): 9 if os.path.exists(path1): 10 return
11 else: 12 try: 13 os.mkdir(path1) # 創建單層文件夾
14 except Exception as e: 15 os.makedirs(path1) # 創建多層文件夾
16
17
18 def split_dataset(root_path, new_path, ratio=0.7): # root: folder1: new_path: dataset1/folder1 按0.7的比例拆分，也可按其他比例
19 folder_list = os.listdir(root_path) # folder1/[class1,class2...]
20 for folder in folder_list: # class1
21 train_path = os.path.join(new_path, "train", str(folder)) 22 test_path = os.path.join(new_path, "test", str(folder)) 23 origin_path = os.path.join(root_path, str(folder)) 24 img_list = os.listdir(origin_path) 25
26 img_num = len(img_list) 27 train_num = int(img_num * ratio) 28 train_sample = random.sample(img_list, train_num) 29 test_sample = list(set(img_list)-set(train_sample)) 30
31 for item in train_sample: 32 src_new = os.path.join(origin_path, str(item)) 33 dst_new = os.path.join(train_path, str(item)) 34 shutil.copy(src=src_new, dst = dst_new) 35 for item in test_sample: 36 src_new = os.path.join(origin_path, str(item)) 37 dst_new = os.path.join(test_path, str(item)) 38 shutil.copy(src=src_new, dst=dst_new) 39
40
41 if __name__ == '__main__': 42 root_path = "dataset"
43 new_path = "dataset1"
44
45 # 創建文件夾
46 for domain in os.listdir(root_path): 47 domain_path = os.path.join(root_path, str(domain)) 48 domain_new_path = os.path.join(new_path, str(domain)) 49 for folder in os.listdir(domain_path): # class1
50 train_path = os.path.join(domain_new_path, "train", str(folder)) 51 test_path = os.path.join(domain_new_path, "test", str(folder)) 52 fileExist(train_path) 53 fileExist(test_path) 54
55 # 拆分數據集到新的路徑
56 for domain in os.listdir(root_path): 57 domain_path = os.path.join(root_path, str(domain)) 58 domain_new_path = os.path.join(new_path, str(domain)) 59 split_dataset(domain_path,domain_new_path