I have a file formatted like this:
train/t/temple/east_asia/00000025.jpg 94 train/t/temple/east_asia/00000865.jpg 94 ... train/s/swamp/00000560.jpg 92 train/s/swamp/00000935.jpg 92 .... train/m/mountain/00000428.jpg 68 train/m/mountain/00000126.jpg 68
The last number is the class number. I have 50 different classes, and each class has 1,000 lines. I would like to take a random sample of size N from each class, and store the result in another text file.