TensorFlow常用操作

　　初始化数据：

# -*- coding: utf-8 -*-
import tensorflow as tf

a = tf.zeros([3, 4], tf.int32)
# [[0 0 0 0]
#  [0 0 0 0]
#  [0 0 0 0]]

b = tf.zeros_like(a) #按照a的结构
# [[0 0 0 0]
#  [0 0 0 0]
#  [0 0 0 0]]

c = tf.ones_like(a) #按照a的结构
# [[1 1 1 1]
#  [1 1 1 1]
#  [1 1 1 1]]

d = tf.constant([1, 2, 3, 4, 5, 6, 7])
# [1 2 3 4 5 6 7]

e = tf.constant(-1.0, shape=[2, 3])
# [[-1. -1. -1.]
#  [-1. -1. -1.]]

f = tf.linspace(10.0, 12.0, 3, name="linspace")
# [ 10.  11.  12.]

g = tf.range(start=3, limit=18, delta=3)
# [ 3  6  9 12 15]


norm = tf.random_normal([2, 3], mean=-1, stddev=4,seed=1) #高斯分布
# [[ -4.24527264   4.93839502  -0.73868251]
#  [-10.7708168   -0.60300636   1.36489725]]

c = tf.constant([[1, 2], [3, 4], [5, 6]]) #shuffle
shuff = tf.random_shuffle(c)


with tf.Session() as sess: 
    print (sess.run(g))

 

　　循环打印：

# -*- coding: utf-8 -*-
import tensorflow as tf

state = tf.Variable(0) #初始化
new_value = tf.add(state, tf.constant(1)) #加一
update = tf.assign(state, new_value) #更新

with tf.Session() as sess: 
    sess.run(tf.global_variables_initializer()) #在会话里初始化全局变量
    print(sess.run(state))    #打印state
    for _ in range(3):
        sess.run(update)    #执行循环
        print(sess.run(state))  #打印state
        # 0
        # 1
        # 2
        # 3

 

　　numpy转TensorFlow格式：

# -*- coding: utf-8 -*-
import tensorflow as tf
import numpy as np
a = np.zeros((3,3))
ta = tf.convert_to_tensor(a)
with tf.Session() as sess:
    print(sess.run(ta))
# [[ 0.  0.  0.]
#  [ 0.  0.  0.]
#  [ 0.  0.  0.]]