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LSTM-ConvNet.py
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LSTM-ConvNet.py
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import tensorflow as tf
import time
from tensorflow.examples.tutorials.mnist import input_data
mnist = input_data.read_data_sets('MNIST_data', one_hot=True)
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='VALID')
def max_pool_2x2(x):
return tf.nn.max_pool(x, ksize=[1, 2, 2, 1], strides=[1, 2, 2, 1], padding='SAME')
def rnn_layer(x, timesteps, num_hidden, weights):
x = tf.unstack(x, timesteps, 1)
lstm_cell_a = tf.contrib.rnn.BasicLSTMCell(num_hidden, forget_bias=1.0)
lstm_cell_b = tf.contrib.rnn.BasicLSTMCell(num_hidden, forget_bias=1.0)
outputs, _, _ = tf.contrib.rnn.static_bidirectional_rnn(
lstm_cell_a, lstm_cell_b, x, dtype=tf.float32)
return tf.matmul(outputs[-1], weights)
# Placeholders
x = tf.placeholder(tf.float32, shape=[None, 784])
y_ = tf.placeholder(tf.float32, shape=[None, 10])
# ConvLayer 1 with max-pooling
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)
# ConvLayer 2 with max-pooling
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)
# LSTM Layer
h_conv2_reshape = tf.transpose(h_conv2, [0, 3, 1, 2])
h_conv2_reshape = tf.reshape(h_conv2_reshape, [-1, 64, 64])
W_dense1 = weight_variable([1024, 1024])
b_dense1 = bias_variable([1024])
h_lstm = rnn_layer(h_conv2_reshape, 64, 512, W_dense1)
h_dense1 = tf.nn.relu(h_lstm + b_dense1)
# Dropout
keep_prob = tf.placeholder(tf.float32)
h_dense1_drop = tf.nn.dropout(h_dense1, keep_prob)
# Dense Layer 2 with Softmax Output
W_dense2 = weight_variable([1024, 10])
b_dense2 = bias_variable([10])
y_conv = tf.matmul(h_dense1_drop, W_dense2) + b_dense2
# Training Parameters
training_rate = tf.placeholder(tf.float32)
cross_entropy = tf.reduce_mean(
tf.nn.softmax_cross_entropy_with_logits(labels=y_, logits=y_conv))
train_step = tf.train.AdamOptimizer(training_rate).minimize(cross_entropy)
correct_prediction = tf.equal(tf.argmax(y_conv, 1), tf.argmax(y_, 1))
accuracy = tf.reduce_mean(tf.cast(correct_prediction, tf.float32))
saver = tf.train.Saver(tf.global_variables())
with tf.Session() as sess:
# Training
sess.run(tf.global_variables_initializer())
data_location = './MNIST-LSTM-ConvNet-DATA/MNIST_LSTM_ConvNet'
#saver.restore(sess, data_location)
last_time = time.time()
rate = 0.0001
for i in range(100000):
batch = mnist.train.next_batch(50)
sess.run(train_step, feed_dict={
x: batch[0], y_: batch[1], keep_prob: 0.5, training_rate: rate})
if i % 10 == 0:
loss, acc = sess.run([cross_entropy, accuracy], feed_dict={
x: batch[0], y_: batch[1], keep_prob: 1.0, training_rate: rate})
print('Step: %d, Accuracy: %.2f, Loss: %.5f, Speed: %.1f sec/10 steps' %
(i, acc, loss, time.time() - last_time))
last_time = time.time()
if i % 250 == 0:
current_accuracy = accuracy.eval(
feed_dict={x: mnist.test.images, y_: mnist.test.labels, keep_prob: 1.0, training_rate: rate})
print('- Current Test Accuracy %.4f' % current_accuracy)
saver.save(sess, data_location)
print('- Model Saved in Step %d' % i)
if current_accuracy > 0.98:
rate = 0.00003
if current_accuracy > 0.99:
rate = 0.000008
if current_accuracy > 0.992:
rate = 0.000003
if current_accuracy > 0.995:
print('- Accuracy Reached 99.5% in Step %d' % i)
break
last_time = time.time()