tensorflow框架
tf.train.shuffle_batch函数输出的tensor的shape的第一维size是问号
X, Y = tf.train.shuffle_batch(data_queues, num_threads=num_threads,
batch_size=batch_size,
capacity=batch_size * 64,
min_after_dequeue=batch_size * 32,
allow_smaller_final_batch=True)
print X
输出X的结果:Tensor("shuffle_batch:0", shape=(?, 28, 28, 1), dtype=float32)
本来 X的shape应该是(87, 28, 28, 1),但是函数输出的却是问号了
请问这样是为什么