深入MNIST code测试

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文章链接： http://blog.csdn.net/yhl_leo/article/details/50624471

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依照教程：深入MNIST教程和Deep MNIST for Experts（英文官网），测试代码及结果如下：

# load MNIST data

import input_data

mnist = input_data.read_data_sets("Mnist_data/", one_hot=True)

# start tensorflow interactiveSession

import tensorflow as tf

sess = tf.InteractiveSession()

# weight initialization

def weight_variable(shape):

    initial = tf.truncated_normal(shape, stddev=0.1)

    return tf.Variable(initial)

def bias_variable(shape):

    initial = tf.constant(0.1, shape = shape)

    return tf.Variable(initial)

# convolution

def conv2d(x, W):

    return tf.nn.conv2d(x, W, strides=[1, 1, 1, 1], padding='SAME')

# pooling

def max_pool_2x2(x):

    return tf.nn.max_pool(x, ksize=[1, 2, 2, 1], strides=[1, 2, 2, 1], padding='SAME')

# Create the model

# placeholder

x = tf.placeholder("float", [None, 784])

y_ = tf.placeholder("float", [None, 10])

# variables

W = tf.Variable(tf.zeros([784,10]))

b = tf.Variable(tf.zeros([10]))

y = tf.nn.softmax(tf.matmul(x,W) + b)

# first convolutinal layer

w_conv1 = weight_variable([5, 5, 1, 32])

b_conv1 = bias_variable([32])

x_image = tf.reshape(x, [-1, 28, 28, 1])

h_conv1 = tf.nn.relu(conv2d(x_image, w_conv1) + b_conv1)

h_pool1 = max_pool_2x2(h_conv1)

# second convolutional layer

w_conv2 = weight_variable([5, 5, 32, 64])

b_conv2 = bias_variable([64])

h_conv2 = tf.nn.relu(conv2d(h_pool1, w_conv2) + b_conv2)

h_pool2 = max_pool_2x2(h_conv2)

# densely connected layer

w_fc1 = weight_variable([7*7*64, 1024])

b_fc1 = bias_variable([1024])

h_pool2_flat = tf.reshape(h_pool2, [-1, 7*7*64])

h_fc1 = tf.nn.relu(tf.matmul(h_pool2_flat, w_fc1) + b_fc1)

# dropout

keep_prob = tf.placeholder("float")

h_fc1_drop = tf.nn.dropout(h_fc1, keep_prob)

# readout layer

w_fc2 = weight_variable([1024, 10])

b_fc2 = bias_variable([10])

y_conv = tf.nn.softmax(tf.matmul(h_fc1_drop, w_fc2) + b_fc2)

# train and evaluate the model

cross_entropy = -tf.reduce_sum(y_*tf.log(y_conv))

train_step = tf.train.AdagradOptimizer(1e-4).minimize(cross_entropy)

correct_prediction = tf.equal(tf.argmax(y_conv, 1), tf.argmax(y_, 1))

accuracy = tf.reduce_mean(tf.cast(correct_prediction, "float"))

sess.run(tf.initialize_all_variables())

for i in range(20000):

    batch = mnist.train.next_batch(50)

    if i%100 == 0:

        train_accuracy = accuracy.eval(feed_dict={x:batch[0], y_:batch[1], keep_prob:1.0})

        print "step %d, train accuracy %g" %(i, train_accuracy)

    train_step.run(feed_dict={x:batch[0], y_:batch[1], keep_prob:0.5})

print "test accuracy %g" % accuracy.eval(feed_dict={x:mnist.test.images, y_:mnist.test.labels, keep_prob:1.0})

其中各个操作的含义，文档里讲解的比较清楚，就不累述了，结果截图：

可以看出，训练结果准确率为93.22%，并不是教程里说的99.2%～

（有读者提议将步长修改更小，测试后效果仍然不佳）

将上述代码中，训练优化方法修改为梯度下降算法：

#train_step = tf.train.AdagradOptimizer(1e-4).minimize(cross_entropy)

train_step = tf.train.GradientDescentOptimizer(1e-3).minimize(cross_entropy)

训练结果精度为：99.25%与教程中的结果一致。