python - Tensorflow 相当于 numpy.diff

Question

有没有等价于numpy.diff的tensorflow ？

Calculate the n-th discrete difference along given axis.

对于我的项目，我只需要 n=1

Answer 1

试试这个:

def tf_diff_axis_0(a):
    return a[1:]-a[:-1]

def tf_diff_axis_1(a):
    return a[:,1:]-a[:,:-1]

检查:

import numpy as np
import tensorflow as tf

x0=np.arange(5)+np.zeros((5,5))
sess = tf.Session()
np.diff(x0, axis=0) == sess.run(tf_diff_axis_0(tf.constant(x0)))
np.diff(x0, axis=1) == sess.run(tf_diff_axis_1(tf.constant(x0)))