[英]Tensorflow LeNet Model MNIST
我在下面的tensorflow leNet模型中找不到我的錯誤。 我收到以下錯誤:ValueError:試圖將“輸入”轉換為張量,但失敗。 錯誤:形狀必須相等,但必須為2和1。將形狀22與其他形狀合並。 適用於輸入形狀為[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]。 看來我的體系結構在尺寸方面是不正確的,但是我似乎無法弄清楚問題出在哪里是我的代碼:
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}))
h_pool2的形狀為(?,4,4,50)。 所以您的這兩行代碼是錯誤的:
h_pool2_flat = tf.reshape(h_pool2, [-1, 8*8*50])
W_fc1 = weight_variable([8 * 8* 50, 500])
更改為4 * 4 * 50應該可以。
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