import os
import shutil

train_dir = '/content/train'
dest_dir = '/content/all_images'
counter = 0

for subdir, dirs, files in os.walk(train_dir):
    #print(files)
    for file in files:
        full_path = os.path.join(subdir, file)
        shutil.copy(full_path, dest_dir)
        counter = counter + 1
print(counter)