教程中的 Tensorflow 不兼容形状错误

Question

我一直在尝试从 Tensorflow tutorial, but I've been having trouble. For some reason, I'm getting errors where the size of y_conv is 4x larger than the size of y_, and I have no idea why. I found 创建卷积网络，但它似乎与我的问题不同，尽管它看起来很相似。

需要说明的是，下面代码中的批量大小是 50，但出现的错误是

tensorflow.python.framework.errors.InvalidArgumentError: Incompatible shapes: [200] vs. [50]

当我将批量大小更改为 10 时，我得到

tensorflow.python.framework.errors.InvalidArgumentError: Incompatible shapes: [40] vs. [10]

所以这在某种程度上与批量大小有关，但我无法弄清楚。谁能告诉我这段代码有什么问题？它几乎直接来自上面链接的教程。

from tensorflow.examples.tutorials.mnist import input_data
mnist = input_data.read_data_sets('MNIST_data', one_hot=True)

import tensorflow as tf
sess = tf.InteractiveSession()

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='SAME')

def max_pool_2x2(x):
  return tf.nn.max_pool(x, ksize=[1, 2, 2, 1], strides = [1, 2, 2, 1], padding='SAME')

x = tf.placeholder("float", shape=[None, 784])
y_ = tf.placeholder("float", shape=[None, 10])

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)

w_conv2 = weight_variable([5, 5, 32, 64])
b_conv2 = bias_variable([64])
h_conv2 = tf.nn.relu(conv2d(h_conv1, w_conv2) + b_conv2)
h_pool2 = max_pool_2x2(h_conv2)

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)

keep_prob = tf.placeholder("float")
h_fc1_drop = tf.nn.dropout(h_fc1, keep_prob)

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)

cross_entropy = -tf.reduce_sum(y_ * tf.log(tf.clip_by_value(y_conv, 1e-10, 1.0)))
train_step = tf.train.AdamOptimizer(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, training 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}))

Answer 1

-1 的重塑是线索。错误的不是批量大小，而是图像大小。您正在将其展平为批处理维度。

为什么图片尺寸不对？

在第二次转换中，您传递的是 conv1 而不是 pool1 conv2d(h_conv1, w_conv2).

就我个人而言，对于这样的管道，我喜欢在数据流经时使用 1 个名称。

开始使用调试器，值得！

教程中的 Tensorflow 不兼容形状错误

Tensorflow Incompatible Shapes Error in Tutorial

tensorflow