tf.segment_sum和tf.unsorted_segment_sum实例

import tensorflow as tfc = tf.constant([[1,2,3,4], [-1,-2,-3,-4], [5,6,7,8]])result = tf.segment_sum(c, tf.constant([0, 0, 1]))#第二个参数长度必须为3result_ = tf.segment_sum(c, tf.constant([0, 1, 1]))result__ = tf.segment_sum(c, tf.constant([0, 1, 2]))result2 = tf.unsorted_segment_sum(c, tf.constant([2, 1, 1]),3)#第二个参数长度必须为3result3 = tf.unsorted_segment_sum(c, tf.constant([1, 0, 1]),2)#result4 = tf.unsorted_segment_sum(c, tf.constant([2, 0, 1]),2) #错误，segment_ids[0] = 2 is out of range [0, 2)result4 = tf.unsorted_segment_sum(c, tf.constant([2, 0, 1]),3)result5 = tf.unsorted_segment_sum(c, tf.constant([3, 1, 0]),5)sess = tf.Session()print("result")print(sess.run(result))print("result_")print(sess.run(result_))print("result__")print(sess.run(result__))print("result2")print(sess.run(result2))print("result3")print(sess.run(result3))print("result4")print(sess.run(result4))print("result5")print(sess.run(result5))

result
[[0 0 0 0]
[5 6 7 8]]
result_
[[1 2 3 4]
[4 4 4 4]]
result__
[[ 1 2 3 4]
[-1 -2 -3 -4]
[ 5 6 7 8]]
result2
[[0 0 0 0]
[4 4 4 4]
[1 2 3 4]]
result3
[[-1 -2 -3 -4]
[ 6 8 10 12]]
result4
[[-1 -2 -3 -4]
[ 5 6 7 8]
[ 1 2 3 4]]
result5
[[ 5 6 7 8]
[-1 -2 -3 -4]
[ 0 0 0 0]
[ 1 2 3 4]
[ 0 0 0 0]]