Я пытаюсь Tensorflow и пытался переписать простой пример MNIST с небольшими изменениями.Я ожидаю увидеть уменьшение значения функции потери после запуска кода, пока этого не происходит.Я сравнил свой код со многими примерами, но не смог выяснить проблему.Вот мой код:
import numpy as np
import tensorflow as tf
BATCH_SIZE = 100
# Data Placeholders
t = tf.placeholder(tf.bool, name='IfTrain_placeholder') # if we are in training phase
X = tf.placeholder(dtype=tf.float32, shape=[None, 28, 28, 1], name='Data_placeholder')
y = tf.placeholder(dtype=tf.int32, shape=[None], name='Label_placeholder')
# Use Datasets to manage data
X_data = tf.data.Dataset.from_tensor_slices(X).batch(BATCH_SIZE)
y_data = tf.data.Dataset.from_tensor_slices(y).batch(BATCH_SIZE)
X_iter = X_data.make_initializable_iterator()
X_batch = X_iter.get_next()
y_iter = y_data.make_initializable_iterator()
y_batch = y_iter.get_next()
oh_y = tf.one_hot(indices=y_batch, depth=10)
# Model structure here
c1 = tf.layers.conv2d(inputs=X_batch,
filters=32,
kernel_size=[5,5],
padding='same',
activation=tf.nn.relu,
name='CNN1')
m1 = tf.layers.max_pooling2d(inputs=c1,
pool_size=[2,2],
strides=2,
padding='same',
name='MaxPool1')
c2 = tf.layers.conv2d(inputs=m1,
filters=64,
kernel_size=[5,5],
padding='same',
activation=tf.nn.relu,
name='CNN2')
m2 = tf.layers.max_pooling2d(inputs=c2,
pool_size=[2,2],
strides=2,
padding='same',
name='MaxPool2')
f1 = tf.reshape(tensor=m2, shape=[-1, 7*7*64], name='Flat1')
d1 = tf.layers.dense(inputs=f1,
units=1024,
activation=tf.nn.softmax,
name='Dense1')
dr1 = tf.layers.dropout(inputs=d1, rate=0.4, training=t, name='Dropout1')
d2 = tf.layers.dense(inputs=dr1,
units=10,
activation=tf.nn.softmax,
name='Dense2')
# Loss and otimization
loss = tf.losses.softmax_cross_entropy(onehot_labels=oh_y, logits=d2)
classes = tf.argmax(input=d2, axis=1, name='ArgMax1')
init = tf.global_variables_initializer()
optimizer = tf.train.GradientDescentOptimizer(learning_rate=0.003, name='GD1')
train_op = optimizer.minimize(loss=loss, global_step=tf.train.get_global_step(), name='Optimizer1')
# Get data
mnist = tf.contrib.learn.datasets.load_dataset("mnist")
X_train = np.reshape(mnist.train.images, (-1, 28, 28, 1))
y_train = np.asarray(mnist.train.labels, dtype=np.int32)
X_test = np.reshape(mnist.test.images, (-1, 28, 28, 1))
y_test = np.asarray(mnist.test.labels, dtype=np.int32)
# Run session
with tf.Session() as sess:
sess.run(init)
sess.run(X_iter.initializer, feed_dict={X:X_train})
sess.run(y_iter.initializer, feed_dict={y:y_train})
while True:
try:
out = sess.run({'accuracy': accuracy, 'loss': loss, 'train optimizer': train_op}, feed_dict={t:True})
print(out['loss'])
except:
break
Я ценю, если кто-нибудь может помочь мне найти проблему.