1. tf.slice()
https://www.jianshu.com/p/71e6ef6c121b
2.tf.stack()/tf.unstack()
https://www.jianshu.com/p/25706575f8d4
3.tf.concat()
t1 = [[[1, 2], [2, 3]], [[4, 4], [5, 3]]]
t2 = [[[7, 4], [8, 4]], [[2, 10], [15, 11]]]
t3=tf.concat([t1, t2], axis=1)#axis是連接的維度
print(sess.run(tf.shape(t3)))
print(sess.run(t3))
---------------output
[2 4 2]#兩個二維數組,每個二維數組中4個一維數組,每個一維數組中2個元素.
[[[ 1 2]
[ 2 3]
[ 7 4]
[ 8 4]]
[[ 4 4]
[ 5 3]
[ 2 10]
[15 11]]]
4.tf.reduce_max()
c = np.array([ [[3.,4], [1.,7]], [[2.,3.],[5.,9.]], [[0,3,],[4,5]] ])
#三個二維數組的對應元素分別比較,4個較大的元素保留,最後三維數組包含一個二維數組
print(sess.run(tf.reduce_max(c, 0,keepdims=True)))#keepdims=True,會保持原維度
print(sess.run(tf.reduce_max(c,0,keepdims=False)))
#三個二維數組內部的兩個一維數組對應元素比較,每個二維數組保留一個放有兩個較大元素的一維數組
print(sess.run(tf.reduce_max(c,1,keepdims=True)))
#每個一維數組內部兩個元素比較,保留較大者
print(sess.run(tf.reduce_max(c,2,keepdims=True)))
---------------------------output
[[[3. 4.]
[5. 9.]]]
-------------
[[3. 4.]
[5. 9.]]#keepdims=False
--------------
[[[3. 7.]]
[[5. 9.]]
[[4. 5.]]]
--------------
[[[4.]
[7.]]
[[3.]
[9.]]
[[3.]
[5.]]]