Tensorflow细节-P54-变量

1、首先复习前面所学知识：
（1）g = tf.Graph()
（2）别忘了初始化时的initializer
（3）with tf.name_scope("generate_constant"): x = tf.constant([[0.7, 0.9]], name="x")这个东西发现没球用
（4）最好是用with tf.variable_scope("generate_variable"):与tf.get_variable相结合，不要用tf.Variable()出什么幺蛾子

import tensorflow as tf
g = tf.Graph()
with g.as_default():
    with tf.variable_scope("generate_variable"):
        w1 = tf.get_variable("w1", [2, 3], tf.float32, initializer=tf.random_normal_initializer(stddev=0.1, seed=1))
        w2 = tf.get_variable("w2", [3, 1], tf.float32, initializer=tf.truncated_normal_initializer(stddev=0.1, seed=1))
    with tf.name_scope("generate_constant"):
        x = tf.constant([[0.7, 0.9]], name="x")

    with tf.name_scope("matmul"):
        a = tf.matmul(x, w1)
        y = tf.matmul(a, w2)

writer = tf.summary.FileWriter("./path", graph=g)
writer.close()

with tf.Session(graph=g) as sess:
    tf.global_variables_initializer().run()
    print(sess.run(y))

2、所有的变量都会被加入到Graphkeys.VARIABLES集合，在变量声明时可控制trainable是之训练/不训练