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'''
Graph and Loss visualization using Tensorboard.
This example is using the MNIST database of handwritten digits
(http://yann.lecun.com/exdb/mnist/)
Author: Aymeric Damien
Project: https://github.com/aymericdamien/TensorFlow-Examples/
'''
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)
# Parameters
learning_rate = 0.01
training_epochs = 25
batch_size = 100
display_epoch = 1
logs_path = '/tmp/tensorflow_logs/example/'
# 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')
# Set model weights
W = tf.Variable(tf.zeros([784, 10]), name='Weights')
b = tf.Variable(tf.zeros([10]), name='Bias')
# Construct model and encapsulating all ops into scopes, making
# Tensorboard's Graph visualization more convenient
with tf.name_scope('Model'):
# Model
pred = tf.nn.softmax(tf.matmul(x, W) + b) # Softmax
with tf.name_scope('Loss'):
# Minimize error using cross entropy
cost = tf.reduce_mean(-tf.reduce_sum(y*tf.log(pred), reduction_indices=1))
with tf.name_scope('SGD'):
# Gradient Descent
optimizer = tf.train.GradientDescentOptimizer(learning_rate).minimize(cost)
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))
# 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", cost)
# Create a summary to monitor accuracy tensor
tf.summary.scalar("accuracy", acc)
# Merge all summaries into a single op
merged_summary_op = tf.summary.merge_all()
# 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([optimizer, cost, 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_epoch == 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")
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