def get_batch(batch_size,original_size,shrunk_size):
	global batch_index
        max_counter = len(train_set)//batch_size
	counter = batch_index % max_counter  # batch_index范围 0-19
	window = [x for x in range(counter*batch_size,(counter+1)*batch_size)]
	imgs = [train_set[q] for q in window]
	x = [transform.resize(get_image(q,original_size),(shrunk_size,shrunk_size)) for q in imgs]
	y = [get_image(q,original_size) for q in imgs]
	batch_index = (batch_index+1)%max_counter
	return x,y