标签:softmax cal bat name esc variables image col log
tensorboard可以将训练过程中的一些参数可视化,比如我们最关注的loss值和accuracy值,简单来说就是把这些值的变化记录在日志里,然后将日志里的这些数据可视化。
首先运行训练代码
#coding:utf-8 import tensorflow as tf from tensorflow.examples.tutorials.mnist import input_data #载入数据集 mnist = input_data.read_data_sets("MNIST_data", one_hot=True) #每个批次的大小 batch_size = 100 #计算一共有多少个批次 n_batch = mnist.train.num_examples // batch_size #参数概要 传入一个参数可以计算这个参数的各个相关值 def variable_summaries(var): with tf.name_scope(‘summaries‘): mean = tf.reduce_mean(var) tf.summary.scalar(‘mean‘, mean)#平均值 with tf.name_scope(‘stddev‘): stddev = tf.sqrt(tf.reduce_mean(tf.square(var - mean))) tf.summary.scalar(‘stddev‘, stddev)#标准差 tf.summary.scalar(‘max‘, tf.reduce_max(var))#最大值 tf.summary.scalar(‘min‘, tf.reduce_min(var))#最小值 tf.summary.histogram(‘histogram‘, var)#直方图 with tf.name_scope(‘input‘): #定义两个placeholder x = tf.placeholder(tf.float32, [None,784],name=‘x-input‘) #输入图像 y = tf.placeholder(tf.float32, [None,10],name=‘y-input‘) #输入标签 #创建一个简单的神经网络 784个像素点对应784个数 因此输入层是784个神经元 输出层是10个神经元 不含隐层 #最后准确率在92%左右 with tf.name_scope(‘layer‘): with tf.name_scope(‘wights‘): W = tf.Variable(tf.zeros([784,10]),name = ‘W‘) #生成784行 10列的全0矩阵 variable_summaries(W) with tf.name_scope(‘biases‘): b = tf.Variable(tf.zeros([1,10]),name=‘b‘) variable_summaries(b) with tf.name_scope(‘softmax‘): prediction = tf.nn.softmax(tf.matmul(x,W)+b) #二次代价函数 #loss = tf.reduce_mean(tf.square(y-prediction)) #交叉熵损失 with tf.name_scope(‘loss‘): loss =tf.reduce_mean(tf.nn.softmax_cross_entropy_with_logits(labels =y,logits = prediction)) tf.summary.scalar(‘loss‘,loss) #使用梯度下降法 #train_step = tf.train.GradientDescentOptimizer(0.2).minimize(loss) train_step = tf.train.AdamOptimizer(1e-3).minimize(loss) #学习率一般设置比较小 收敛速度快 #初始化变量 init = tf.global_variables_initializer() #结果存放在布尔型列表中 #argmax能给出某个tensor对象在某一维上的其数据最大值所在的索引值 with tf.name_scope(‘accuracy‘): with tf.name_scope(‘correct_prediction‘): correct_prediction = tf.equal(tf.argmax(y,1), tf.argmax(prediction,1)) with tf.name_scope(‘accuracy‘): accuracy = tf.reduce_mean(tf.cast(correct_prediction,tf.float32)) tf.summary.scalar(‘accuracy‘,accuracy) #合并所有的summary merged = tf.summary.merge_all() with tf.Session() as sess: sess.run(init) writer = tf.summary.FileWriter(‘/home/xxx/logs/‘,sess.graph) #定义记录日志的位置 for epoch in range(50): for batch in range(n_batch): # batch_xs,batch_ys = mnist.train.next_batch(batch_size) summary,_ = sess.run([merged,train_step],feed_dict={x:batch_xs,y:batch_ys}) writer.add_summary(summary,epoch) #将summary epoch 写入到writer acc = sess.run(accuracy,feed_dict={x:mnist.test.images, y:mnist.test.labels}) print ("Iter " + str(epoch) + ",Testing Accuracy " + str(acc))
注意我将训练日志保存在 /home/xxx/logs/ 路径下,打开终端,输入以下命令 tensorboard --logdir=/home/xxx/logs/ 如下图所示
在浏览器中输入127.0.0.1:6006,可以看到可视化效果,如loss和accuracy的变化折线图
Tensorflow学习教程------tensorboard网络运行和可视化
标签:softmax cal bat name esc variables image col log
原文地址:http://www.cnblogs.com/cnugis/p/7641133.html