Previously in 2_fullyconnected.ipynb and 3_regularization.ipynb, we trained fully connected networks to classify notMNIST characters.
The goal of this assignment is make the neural network convolutional.
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# These are all the modules we'll be using later. Make sure you can import them
# before proceeding further.
from __future__ import print_function
import numpy as np
import tensorflow as tf
from six.moves import cPickle as pickle
from six.moves import range
In [2]:
pickle_file = 'notMNIST.pickle'
with open(pickle_file, 'rb') as f:
save = pickle.load(f)
train_dataset = save['train_dataset']
train_labels = save['train_labels']
valid_dataset = save['valid_dataset']
valid_labels = save['valid_labels']
test_dataset = save['test_dataset']
test_labels = save['test_labels']
del save # hint to help gc free up memory
print('Training set', train_dataset.shape, train_labels.shape)
print('Validation set', valid_dataset.shape, valid_labels.shape)
print('Test set', test_dataset.shape, test_labels.shape)
Reformat into a TensorFlow-friendly shape:
In [3]:
image_size = 28
num_labels = 10
num_channels = 1 # grayscale
import numpy as np
def reformat(dataset, labels):
dataset = dataset.reshape(
(-1, image_size, image_size, num_channels)).astype(np.float32)
labels = (np.arange(num_labels) == labels[:,None]).astype(np.float32)
return dataset, labels
train_dataset, train_labels = reformat(train_dataset, train_labels)
valid_dataset, valid_labels = reformat(valid_dataset, valid_labels)
test_dataset, test_labels = reformat(test_dataset, test_labels)
print('Training set', train_dataset.shape, train_labels.shape)
print('Validation set', valid_dataset.shape, valid_labels.shape)
print('Test set', test_dataset.shape, test_labels.shape)
In [4]:
def accuracy(predictions, labels):
return (100.0 * np.sum(np.argmax(predictions, 1) == np.argmax(labels, 1))
/ predictions.shape[0])
Let's build a small network with two convolutional layers, followed by one fully connected layer. Convolutional networks are more expensive computationally, so we'll limit its depth and number of fully connected nodes.
In [5]:
batch_size = 16
patch_size = 5
depth = 16
num_hidden = 64
graph = tf.Graph()
with graph.as_default():
# Input data.
tf_train_dataset = tf.placeholder(
tf.float32, shape=(batch_size, image_size, image_size, num_channels))
tf_train_labels = tf.placeholder(tf.float32, shape=(batch_size, num_labels))
tf_valid_dataset = tf.constant(valid_dataset)
tf_test_dataset = tf.constant(test_dataset)
# Variables.
layer1_weights = tf.Variable(tf.truncated_normal(
[patch_size, patch_size, num_channels, depth], stddev=0.1))
layer1_biases = tf.Variable(tf.zeros([depth]))
layer2_weights = tf.Variable(tf.truncated_normal(
[patch_size, patch_size, depth, depth], stddev=0.1))
layer2_biases = tf.Variable(tf.constant(1.0, shape=[depth]))
layer3_weights = tf.Variable(tf.truncated_normal(
[image_size // 4 * image_size // 4 * depth, num_hidden], stddev=0.1))
layer3_biases = tf.Variable(tf.constant(1.0, shape=[num_hidden]))
layer4_weights = tf.Variable(tf.truncated_normal(
[num_hidden, num_labels], stddev=0.1))
layer4_biases = tf.Variable(tf.constant(1.0, shape=[num_labels]))
# Model.
def model(data):
conv = tf.nn.conv2d(data, layer1_weights, [1, 1, 1, 1], padding='SAME')
hidden = tf.nn.relu(conv + layer1_biases)
hidden = tf.nn.max_pool(hidden, [1,2,2,1], [1,2,2,1], padding='SAME')
conv = tf.nn.conv2d(hidden, layer2_weights, [1, 1, 1, 1], padding='SAME')
hidden = tf.nn.relu(conv + layer2_biases)
hidden = tf.nn.max_pool(hidden, [1,2,2,1], [1,2,2,1], padding='SAME')
shape = hidden.get_shape().as_list()
reshape = tf.reshape(hidden, [shape[0], shape[1] * shape[2] * shape[3]])
hidden = tf.nn.relu(tf.matmul(reshape, layer3_weights) + layer3_biases)
return tf.matmul(hidden, layer4_weights) + layer4_biases
# Training computation.
logits = model(tf_train_dataset)
loss = tf.reduce_mean(
tf.nn.softmax_cross_entropy_with_logits(logits, tf_train_labels))
# Optimizer.
optimizer = tf.train.GradientDescentOptimizer(0.05).minimize(loss)
# Predictions for the training, validation, and test data.
train_prediction = tf.nn.softmax(logits)
valid_prediction = tf.nn.softmax(model(tf_valid_dataset))
test_prediction = tf.nn.softmax(model(tf_test_dataset))
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num_steps = 2001
with tf.Session(graph=graph) as session:
tf.initialize_all_variables().run()
print('Initialized')
for step in range(num_steps):
offset = (step * batch_size) % (train_labels.shape[0] - batch_size)
batch_data = train_dataset[offset:(offset + batch_size), :, :, :]
batch_labels = train_labels[offset:(offset + batch_size), :]
feed_dict = {tf_train_dataset : batch_data, tf_train_labels : batch_labels}
_, l, predictions = session.run(
[optimizer, loss, train_prediction], feed_dict=feed_dict)
if (step % 50 == 0):
print('Minibatch loss at step %d: %f' % (step, l))
print('Minibatch accuracy: %.1f%%' % accuracy(predictions, batch_labels))
print('Validation accuracy: %.1f%%' % accuracy(
valid_prediction.eval(), valid_labels))
print('Test accuracy: %.1f%%' % accuracy(test_prediction.eval(), test_labels))
Try to get the best performance you can using a convolutional net. Look for example at the classic LeNet5 architecture, adding Dropout, and/or adding learning rate decay.
In [5]:
initial_learning_rate_value = 0.05
batch_size = 16
patch_size = 5
depth = 16
depth2 = 16
num_hidden = 64
num_hidden2 = 32
graph = tf.Graph()
with graph.as_default():
# Input data.
with tf.name_scope('datasets') as scope:
tf_train_dataset = tf.placeholder(
tf.float32, shape=(batch_size, image_size, image_size, num_channels))
tf_train_labels = tf.placeholder(tf.float32, shape=(batch_size, num_labels))
tf_valid_dataset = tf.constant(valid_dataset)
tf_test_dataset = tf.constant(test_dataset)
# learning rate decay
with tf.name_scope('hyperparams') as scope:
global_step = tf.Variable(0)
learning_rate = tf.train.exponential_decay(initial_learning_rate_value, global_step, 1, 0.9999)
# Variables.
with tf.name_scope('layers') as scope:
layer1_weights = tf.Variable(tf.truncated_normal([patch_size, patch_size, num_channels, depth], stddev=0.1))
layer1_biases = tf.Variable(tf.zeros([depth]))
layer2_weights = tf.Variable(tf.truncated_normal([patch_size, patch_size, depth, depth], stddev=0.1))
layer2_biases = tf.Variable(tf.constant(1.0, shape=[depth]))
layer3_weights = tf.Variable(tf.truncated_normal([patch_size, patch_size, depth, depth2], stddev=0.1))
layer3_biases = tf.Variable(tf.constant(1.0, shape=[depth2]))
layer4_weights = tf.Variable(tf.truncated_normal([image_size // 7 * image_size // 7 * depth2, num_hidden], stddev=0.1))
layer4_biases = tf.Variable(tf.constant(1.0, shape=[num_hidden]))
layer5_weights = tf.Variable(tf.truncated_normal([num_hidden, num_hidden2], stddev=0.1))
layer5_biases = tf.Variable(tf.constant(1.0, shape=[num_hidden2]))
layer6_weights = tf.Variable(tf.truncated_normal([num_hidden2, num_labels], stddev=0.1))
layer6_biases = tf.Variable(tf.constant(1.0, shape=[num_labels]))
# Model.
def model(data):
# data ---> conv2d | layer1 ---> relu --> max_pool
#
# data input tensor: [16, 28, 28, 1] 4D tensor: (batch, h, w, ch)
# layer1 filter tensor: [5, 5, 1, 16]
# conv2d output tensor: [16, 28, 28, 16]
# relu output tensor: [16, 28, 28, 16]
# max_pool output tensor: [16, 14, 14 16]
conv = tf.nn.conv2d(data, layer1_weights, [1, 1, 1, 1], padding='SAME')
hidden = tf.nn.relu(conv + layer1_biases)
hidden = tf.nn.max_pool(hidden, [1,2,2,1], [1,2,2,1], padding='SAME')
# hidden ---> conv2d | layer2 ---> relu --> max_pool
#
# hidden input tensor: [16, 14, 14, 16]
# layer2 filter tensor: [5, 5, 16, 16]
# conv2d output tensor: [16, 14, 14, 16]
# relu output tensor: [16, 14, 14, 16]
# max_pool output tensor: [16, 7, 7, 16]
conv = tf.nn.conv2d(hidden, layer2_weights, [1, 1, 1, 1], padding='SAME')
hidden = tf.nn.relu(conv + layer2_biases)
hidden = tf.nn.max_pool(hidden, [1,2,2,1], [1,2,2,1], padding='SAME')
# hidden ---> conv2d | layer3 ---> relu --> max_pool
#
# hidden input tensor: [16, 7, 7, 16]
# layer3 filter tensor: [5, 5, 16, 32]
# conv2d output tensor: [16, 7, 7, 32]
# relu output tensor: [16, 7, 7, 32]
# max_pool output tensor: [16, 4, 4, 32]
conv = tf.nn.conv2d(hidden, layer3_weights, [1, 1, 1, 1], padding='SAME')
hidden = tf.nn.relu(conv + layer3_biases)
hidden = tf.nn.max_pool(hidden, [1,2,2,1], [1,2,2,1], padding='SAME')
# hidden ---> relu --> dropout
#
# hidden input tensor: [16, 4, 4, 32]
# reshape tensor: [16, 512]
# layer4 tensor: [512, 64] (512 = 4*4*32)
# relu tensor: [16, 64]
shape = hidden.get_shape().as_list()
reshape = tf.reshape(hidden, [shape[0], shape[1] * shape[2] * shape[3]])
hidden = tf.nn.relu(tf.matmul(reshape, layer4_weights) + layer4_biases)
hidden = tf.nn.dropout(hidden, 0.75)
hidden = tf.nn.relu(tf.matmul(hidden, layer5_weights) + layer5_biases)
hidden = tf.nn.dropout(hidden, 0.75)
output = tf.matmul(hidden, layer6_weights) + layer6_biases
return output
# Training computation.
logits = model(tf_train_dataset)
loss = tf.reduce_mean(tf.nn.softmax_cross_entropy_with_logits(logits, tf_train_labels))
# Optimizer.
optimizer = tf.train.GradientDescentOptimizer(learning_rate).minimize(loss, global_step=global_step)
# Predictions for the training, validation, and test data.
with tf.name_scope("train") as scope:
train_prediction = tf.nn.softmax(logits)
with tf.name_scope("valid") as scope:
valid_prediction = tf.nn.softmax(model(tf_valid_dataset))
with tf.name_scope("test") as scope:
test_prediction = tf.nn.softmax(model(tf_test_dataset))
In [6]:
num_steps = 1001
with tf.Session(graph=graph) as session:
merged = tf.merge_all_summaries()
writer = tf.train.SummaryWriter("/tmp/mnist_logs", session.graph_def)
tf.initialize_all_variables().run()
print('Initialized')
for step in range(num_steps):
offset = (step * batch_size) % (train_labels.shape[0] - batch_size)
batch_data = train_dataset[offset:(offset + batch_size), :, :, :]
batch_labels = train_labels[offset:(offset + batch_size), :]
feed_dict = {tf_train_dataset : batch_data, tf_train_labels : batch_labels}
_, l, predictions = session.run(
[optimizer, loss, train_prediction], feed_dict=feed_dict)
if (step % 50 == 0):
print('Minibatch loss at step %d: %f' % (step, l))
print("Learning rate at step %d: %f" % (step, learning_rate.eval()))
print('Minibatch accuracy: %.1f%%' % accuracy(predictions, batch_labels))
print('Validation accuracy: %.1f%%\n' % accuracy(
valid_prediction.eval(), valid_labels))
#writer.add_summary(summary_result)
if (step % 200 == 0):
print('Test accuracy: %.1f%%\n' % accuracy(test_prediction.eval(), test_labels))
print('Final test accuracy: %.1f%%' % accuracy(test_prediction.eval(), test_labels))
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