Advanced visualization using Tensorboard (weights, gradient, ...). This example is using the MNIST database of handwritten digits (http://yann.lecun.com/exdb/mnist/).
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from __future__ import print_function
import tensorflow as tf
# Import MNIST data
from tensorflow.examples.tutorials.mnist import input_data
mnist = input_data.read_data_sets("/tmp/data/", one_hot=True)
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# Parameters
learning_rate = 0.01
training_epochs = 25
batch_size = 100
display_step = 1
logs_path = '/tmp/tensorflow_logs/example/'
# Network Parameters
n_hidden_1 = 256 # 1st layer number of features
n_hidden_2 = 256 # 2nd layer number of features
n_input = 784 # MNIST data input (img shape: 28*28)
n_classes = 10 # MNIST total classes (0-9 digits)
# tf Graph Input
# mnist data image of shape 28*28=784
x = tf.placeholder(tf.float32, [None, 784], name='InputData')
# 0-9 digits recognition => 10 classes
y = tf.placeholder(tf.float32, [None, 10], name='LabelData')
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# Create model
def multilayer_perceptron(x, weights, biases):
# Hidden layer with RELU activation
layer_1 = tf.add(tf.matmul(x, weights['w1']), biases['b1'])
layer_1 = tf.nn.relu(layer_1)
# Create a summary to visualize the first layer ReLU activation
tf.summary.histogram("relu1", layer_1)
# Hidden layer with RELU activation
layer_2 = tf.add(tf.matmul(layer_1, weights['w2']), biases['b2'])
layer_2 = tf.nn.relu(layer_2)
# Create another summary to visualize the second layer ReLU activation
tf.summary.histogram("relu2", layer_2)
# Output layer
out_layer = tf.add(tf.matmul(layer_2, weights['w3']), biases['b3'])
return out_layer
# Store layers weight & bias
weights = {
'w1': tf.Variable(tf.random_normal([n_input, n_hidden_1]), name='W1'),
'w2': tf.Variable(tf.random_normal([n_hidden_1, n_hidden_2]), name='W2'),
'w3': tf.Variable(tf.random_normal([n_hidden_2, n_classes]), name='W3')
}
biases = {
'b1': tf.Variable(tf.random_normal([n_hidden_1]), name='b1'),
'b2': tf.Variable(tf.random_normal([n_hidden_2]), name='b2'),
'b3': tf.Variable(tf.random_normal([n_classes]), name='b3')
}
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# Encapsulating all ops into scopes, making Tensorboard's Graph
# Visualization more convenient
with tf.name_scope('Model'):
# Build model
pred = multilayer_perceptron(x, weights, biases)
with tf.name_scope('Loss'):
# Softmax Cross entropy (cost function)
loss = tf.reduce_mean(tf.nn.softmax_cross_entropy_with_logits(logits=pred, labels=y))
with tf.name_scope('SGD'):
# Gradient Descent
optimizer = tf.train.GradientDescentOptimizer(learning_rate)
# Op to calculate every variable gradient
grads = tf.gradients(loss, tf.trainable_variables())
grads = list(zip(grads, tf.trainable_variables()))
# Op to update all variables according to their gradient
apply_grads = optimizer.apply_gradients(grads_and_vars=grads)
with tf.name_scope('Accuracy'):
# Accuracy
acc = tf.equal(tf.argmax(pred, 1), tf.argmax(y, 1))
acc = tf.reduce_mean(tf.cast(acc, tf.float32))
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# Initialize the variables (i.e. assign their default value)
init = tf.global_variables_initializer()
# Create a summary to monitor cost tensor
tf.summary.scalar("loss", loss)
# Create a summary to monitor accuracy tensor
tf.summary.scalar("accuracy", acc)
# Create summaries to visualize weights
for var in tf.trainable_variables():
tf.summary.histogram(var.name, var)
# Summarize all gradients
for grad, var in grads:
tf.summary.histogram(var.name + '/gradient', grad)
# Merge all summaries into a single op
merged_summary_op = tf.summary.merge_all()
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# Start training
with tf.Session() as sess:
# Run the initializer
sess.run(init)
# op to write logs to Tensorboard
summary_writer = tf.summary.FileWriter(logs_path,
graph=tf.get_default_graph())
# Training cycle
for epoch in range(training_epochs):
avg_cost = 0.
total_batch = int(mnist.train.num_examples/batch_size)
# Loop over all batches
for i in range(total_batch):
batch_xs, batch_ys = mnist.train.next_batch(batch_size)
# Run optimization op (backprop), cost op (to get loss value)
# and summary nodes
_, c, summary = sess.run([apply_grads, loss, merged_summary_op],
feed_dict={x: batch_xs, y: batch_ys})
# Write logs at every iteration
summary_writer.add_summary(summary, epoch * total_batch + i)
# Compute average loss
avg_cost += c / total_batch
# Display logs per epoch step
if (epoch+1) % display_step == 0:
print("Epoch:", '%04d' % (epoch+1), "cost=", "{:.9f}".format(avg_cost))
print("Optimization Finished!")
# Test model
# Calculate accuracy
print("Accuracy:", acc.eval({x: mnist.test.images, y: mnist.test.labels}))
print("Run the command line:\n" \
"--> tensorboard --logdir=/tmp/tensorflow_logs " \
"\nThen open http://0.0.0.0:6006/ into your web browser")