Tensorflow LeNet模型MNIST

Question

我在下面的tensorflow leNet模型中找不到我的错误。 我收到以下错误：ValueError：试图将“输入”转换为张量，但失败。 错误：形状必须相等，但必须为2和1。将形状22与其他形状合并。 适用于输入形状为[5,5,1,20]，[20]，[5、5、20、50]，[50]，[2450,200]的“ Print_4 / packed”（op：“ Pack”） ，[200]，[200,10]，[10]，[5,5,1,20]，[20]，[5,5,20,50]，[50]，[2450,200]，[ 200]，[200,10]，[10]，[5,5,1,20]，[20]，[5,5,20,50]，[50]，[2450,200]，[200] ，[200,10]，[10]。 看来我的体系结构在尺寸方面是不正确的，但是我似乎无法弄清楚问题出在哪里是我的代码：

 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)



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

def max_pool_2x2(x):
   return tf.nn.max_pool(x, ksize=[1, 2, 2, 1],
                      strides=[1, 2, 2, 1], padding='SAME')
     # Input layer
 x  = tf.placeholder(tf.float32, [None, 784], name='x')
 y_ = tf.placeholder(tf.float32, [None, 10],  name='y_')
x_image = tf.reshape(x, [-1, 28, 28, 1])
# Convolutional layer 1
W_conv1 = weight_variable([5, 5, 1, 20])
b_conv1 = bias_variable([20])

h_conv1 = conv2d(x_image, W_conv1) + b_conv1
h_pool1 = max_pool_2x2(h_conv1)


W_conv2 = weight_variable([5, 5, 20, 50])

b_conv2 = bias_variable([50])

h_conv2 = conv2d(h_pool1, W_conv2) + b_conv2
h_pool2 = max_pool_2x2(h_conv2)

h_pool2_flat = tf.reshape(h_pool2, [-1, 8*8*50])

W_fc1 = weight_variable([8 * 8* 50, 500])

b_fc1 = bias_variable([500])

h_fc1 = tf.nn.relu(tf.matmul(h_pool2_flat, W_fc1) + b_fc1)


W_fc2 = weight_variable([500, 10])

b_fc2 = bias_variable([10])

y = tf.nn.softmax(tf.matmul(h_fc1, W_fc2) + b_fc2, name='y')


cross_entropy = tf.reduce_mean(-tf.reduce_sum(y_ * tf.log(y), 
reduction_indices=[1]))

correct_prediction = tf.equal(tf.argmax(y, 1), tf.argmax(y_, 1))
accuracy = tf.reduce_mean(tf.cast(correct_prediction, tf.float32), 
name='accuracy')

 # Training algorithm
  train_step = tf.train.AdamOptimizer(1e-4).minimize(cross_entropy)


 with tf.Session() as sess:
     sess.run(tf.global_variables_initializer())
     max_steps = 20000
     for step in range(max_steps):
          a = tf.Print(v, [v], message="This is a: ")
         #print(a.eval())
         batch_xs, batch_ys = mnist.train.next_batch(50)


         sess.run([train_step], feed_dict={x: batch_xs, y_: batch_ys, 
         keep_prob: 0.5})
print(max_steps, sess.run(accuracy, feed_dict={x: mnist.test.images, 
  y_: mnist.test.labels, keep_prob: 1.0}))

Answer 1

h_pool2的形状为（？，4,4,50）。 所以您的这两行代码是错误的：

h_pool2_flat = tf.reshape(h_pool2, [-1, 8*8*50])

W_fc1 = weight_variable([8 * 8* 50, 500])

更改为4 * 4 * 50应该可以。