TensorFlow修改变量值后,需要重新赋值,assign用起来有点小技巧,就是需要需要弄个操作子,运行一下。
下面这么用是不行的
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import tensorflow as tf import numpy as np x = tf.Variable( 0 ) init = tf.initialize_all_variables() sess = tf.InteractiveSession() sess.run(init) print (x. eval ()) x.assign( 1 ) print (x. eval ()) |
正确用法
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import tensorflow as tf x = tf.Variable( 0 ) y = tf.assign(x, 1 ) with tf.Session() as sess: sess.run(tf.global_variables_initializer()) print sess.run(x) print sess.run(y) print sess.run(x) |
2.
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In [ 212 ]: w = tf.Variable( 12 ) In [ 213 ]: w_new = w.assign( 34 ) In [ 214 ]: with tf.Session() as sess: ...: sess.run(w_new) ...: print (w_new. eval ()) # output 34 |
3.
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import tensorflow as tf x = tf.Variable( 0 ) sess = tf.Session() sess.run(tf.global_variables_initializer()) print (sess.run(x)) # Prints 0. x.load( 1 , sess) print (sess.run(x)) # Prints 1. |
我的方法
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import numpy as np #这是Python的一种开源的数值计算扩展,非常强大 import tensorflow as tf #导入tensorflow ##构造数据## x_data = np.random.rand( 100 ).astype(np.float32) #随机生成100个类型为float32的值 y_data = x_data * 0.1 + 0.3 #定义方程式y=x_data*A+B ##-------## ##建立TensorFlow神经计算结构## weight = tf.Variable(tf.random_uniform([ 1 ], - 1.0 , 1.0 )) biases = tf.Variable(tf.zeros([ 1 ])) y = weight * x_data + biases w1 = weight * 2 loss = tf.reduce_mean(tf.square(y - y_data)) #判断与正确值的差距 optimizer = tf.train.GradientDescentOptimizer( 0.5 ) #根据差距进行反向传播修正参数 train = optimizer.minimize(loss) #建立训练器 init = tf.global_variables_initializer() #初始化TensorFlow训练结构 #sess=tf.Session() #建立TensorFlow训练会话 sess = tf.InteractiveSession() sess.run(init) #将训练结构装载到会话中 print ( 'weight' ,weight. eval ()) for step in range ( 400 ): #循环训练400次 sess.run(train) #使用训练器根据训练结构进行训练 if step % 20 = = 0 : #每20次打印一次训练结果 print (step,sess.run(weight),sess.run(biases)) #训练次数,A值,B值 print (sess.run(loss)) print ( 'weight new' ,weight. eval ()) #wop=weight.assign([3]) #wop.eval() weight.load([ 1 ],sess) print ( 'w1' ,w1. eval ()) |
以上这篇对TensorFlow的assign赋值用法详解就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/mustar_2017/article/details/79336679