基于MNIST數據集實現簡單的卷積神經網絡，熟悉基于TensorFlow的CNN的流程和框架。

#1、導入相關庫 import numpy as np import tensorflow as tf import matplotlib.pyplot as plt import input_data#2、加載數據集 mnist = input_data.read_data_sets('data/', one_hot=True) trainimg = mnist.train.images trainlabel = mnist.train.labels testimg = mnist.test.images testlabel = mnist.test.labels print("MNIST ready")#3、定義權重和偏置 n_input = 784 n_output= 10 weights = {'wc1':tf.Variable(tf.random_normal([3,3,1,64], stddev=0.1)),'wc2':tf.Variable(tf.random_normal([3,3,64,128],stddev=0.1)),'wd1':tf.Variable(tf.random_normal([7*7*128,1024],stddev=0.1)),'wd2':tf.Variable(tf.random_normal([1024,n_output],stddev=0.1)) } biases = {'bc1':tf.Variable(tf.random_normal([64], stddev=0.1)),'bc2':tf.Variable(tf.random_normal([128],stddev=0.1)),'bd1':tf.Variable(tf.random_normal([1024],stddev=0.1)),'bd2':tf.Variable(tf.random_normal([n_output],stddev=0.1)) }#4、定義CNN層 def conv_basic(_input, _w, _b, _keepratio):# INPUT_input_r = tf.reshape(_input, shape=[-1, 28, 28, 1])# CONV LAYER 1_conv1 = tf.nn.conv2d(_input_r, _w['wc1'], strides=[1, 1, 1, 1], padding='SAME')#_mean, _var = tf.nn.moments(_conv1, [0, 1, 2])#_conv1 = tf.nn.batch_normalization(_conv1, _mean, _var, 0, 1, 0.0001)_conv1 = tf.nn.relu(tf.nn.bias_add(_conv1, _b['bc1']))_pool1 = tf.nn.max_pool(_conv1, ksize=[1, 2, 2, 1], strides=[1, 2, 2, 1], padding='SAME')_pool_dr1 = tf.nn.dropout(_pool1, _keepratio)# CONV LAYER 2_conv2 = tf.nn.conv2d(_pool_dr1, _w['wc2'], strides=[1, 1, 1, 1], padding='SAME')#_mean, _var = tf.nn.moments(_conv2, [0, 1, 2])#_conv2 = tf.nn.batch_normalization(_conv2, _mean, _var, 0, 1, 0.0001)_conv2 = tf.nn.relu(tf.nn.bias_add(_conv2, _b['bc2']))_pool2 = tf.nn.max_pool(_conv2, ksize=[1, 2, 2, 1], strides=[1, 2, 2, 1], padding='SAME')_pool_dr2 = tf.nn.dropout(_pool2, _keepratio)# VECTORIZE_dense1 = tf.reshape(_pool_dr2, [-1, _w['wd1'].get_shape().as_list()[0]])# FULLY CONNECTED LAYER 1_fc1 = tf.nn.relu(tf.add(tf.matmul(_dense1, _w['wd1']), _b['bd1']))_fc_dr1 = tf.nn.dropout(_fc1, _keepratio)# FULLY CONNECTED LAYER 2_out = tf.add(tf.matmul(_fc_dr1, _w['wd2']), _b['bd2'])# RETURNout = { 'input_r': _input_r, 'conv1': _conv1, 'pool1': _pool1, 'pool1_dr1': _pool_dr1,'conv2': _conv2, 'pool2': _pool2, 'pool_dr2': _pool_dr2, 'dense1': _dense1,'fc1': _fc1, 'fc_dr1': _fc_dr1, 'out': _out}return out print ("CNN READY") #5、定義會話,初始化 a = tf.Variable(tf.random_normal([3,3,1,64], stddev=0.1)) print(a) a = tf.Print(a, [a], "a: ") init = tf.global_variables_initializer() sess = tf.Session() sess.run(init)#print (help(tf.nn.conv2d)) print (help(tf.nn.max_pool))x = tf.placeholder(tf.float32, [None, n_input]) y = tf.placeholder(tf.float32, [None, n_output]) keepratio = tf.placeholder(tf.float32)#functions _pred = conv_basic(x, weights, biases, keepratio)['out'] cost = tf.reduce_mean(tf.nn.softmax_cross_entropy_with_logits(logits=_pred, labels=y)) optm = tf.train.AdamOptimizer(learning_rate=0.001).minimize(cost) _corr = tf.equal(tf.argmax(_pred,1), tf.argmax(y,1)) accr = tf.reduce_mean(tf.cast(_corr, tf.float32)) init = tf.global_variables_initializer()#save print("GRAAPH ready")sess = tf.Session() sess.run(init)training_epochs = 15 batch_size = 16 display_step = 1 for epoch in range(training_epochs):avg_cost = 0.#total_batch = int(mnist.train.num_examples/batch_size)total_batch = 10# Loop over all batchesfor i in range(total_batch):batch_xs, batch_ys = mnist.train.next_batch(batch_size)# Fit training using batch datasess.run(optm, feed_dict={x: batch_xs, y: batch_ys, keepratio:0.7})# Compute average lossavg_cost += sess.run(cost, feed_dict={x: batch_xs, y: batch_ys, keepratio:1.})/total_batch# Display logs per epoch stepif epoch % display_step == 0: print ("Epoch: %03d/%03d cost: %.9f" % (epoch, training_epochs, avg_cost))train_acc = sess.run(accr, feed_dict={x: batch_xs, y: batch_ys, keepratio:1.})print (" Training accuracy: %.3f" % (train_acc))#test_acc = sess.run(accr, feed_dict={x: testimg, y: testlabel, keepratio:1.})#print (" Test accuracy: %.3f" % (test_acc))print ("OPTIMIZATION FINISHED")

訓練過程及結果如下：

總結

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