tf.reduce_mean求平均值
阿新 • • 發佈:2018-12-12
import tensorflow as tf
x = tf.constant([[1., 1.],
[2., 2.]])
tf.reduce_mean(x)
# 第一個引數是一個集合,可以是列表、二維陣列和多維陣列。
#第二個引數指定在哪個維度上面求平均值。預設對所有的元素求平均
m1 = tf.reduce_mean(x, axis=0) # [1.5, 1.5]
m2 = tf.reduce_mean(x, 1) # [1., 2.]
xx = tf.constant([[[1., 1, 1],
[ 2., 2, 2]],
[[3, 3, 3],
[4, 4, 4]]])
m3 = tf.reduce_mean(xx, [0, 1]) # [2.5 2.5 2.5]
with tf.Session() as sess:
sess.run(tf.global_variables_initializer())
print(sess.run(m1))
print(sess.run(m2))
print(xx.get_shape())
print(sess.run(m3))
[1.5 1.5]
[1. 2.]
(2, 2, 3)
[2.5 2.5 2.5]