tf.slice()函数用法

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import tensorflow as tf

t = tf.constant([[1, 1, 1, 0],
                 [2, 2, 0, 0],
                 [3, 0, 0, 0],
                 [4, 0, 0, 0],
                 [5, 0, 0, 0]]
                 )

print(t.get_shape())

length = tf.constant([3,2,1,1,1])
print(length)

# for each in t:
#     t_slice = tf.slice(t, [0, 0], [[3,2,1,1,1],0])
#
# print(t_slice)

t_1 = tf.constant([1,1,1,0])
length_1 = tf.constant(3)
slice_1 = tf.slice(t_1,[0],[length_1])

all_slice = []
stacks_t = tf.unstack(t)
for i, each_row in enumerate(stacks_t):
    slice_k = tf.slice(t_1,[0],[length[i]])
    all_slice.append(tf.expand_dims(slice_k,0))


# slice_t = tf.stack(all_slice,axis=0)

with tf.Session() as sess:
    # print(sess.run(tf.slice(t, [0, 0], [4,  3])))
    print(sess.run(slice_1))
    print(sess.run(all_slice))
    # print(sess.run(stacks_t))

output:

(5, 4)
Tensor("Const_1:0", shape=(5,), dtype=int32)
[1 1 1]
[array([[1, 1, 1]], dtype=int32), array([[1, 1]], dtype=int32), array([[1]], dtype=int32), array([[1]], dtype=int32), array([[1]], dtype=int32)]