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bob/learn/tensorflow/examples/mnist/mnist_config.py deleted 100644 → 0
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# Copyright 2017 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Convolutional Neural Network Estimator for MNIST, built with tf.layers."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
# create reproducible nets:
from bob.learn.tensorflow.utils.reproducible import run_config
import tensorflow as tf
from bob.db.mnist import Database
model_dir = '/tmp/mnist_model'
train_tfrecords = ['/tmp/mnist_data/train.tfrecords']
eval_tfrecords = ['/tmp/mnist_data/test.tfrecords']
run_config = run_config.replace(keep_checkpoint_max=10**3)
run_config = run_config.replace(save_checkpoints_secs=60)
def input_fn(mode, batch_size=1):
"""A simple input_fn using the contrib.data input pipeline."""
def example_parser(serialized_example):
"""Parses a single tf.Example into image and label tensors."""
features = tf.parse_single_example(
serialized_example,
features={
'data': tf.FixedLenFeature([], tf.string),
'label': tf.FixedLenFeature([], tf.int64),
'key': tf.FixedLenFeature([], tf.string),
})
image = tf.decode_raw(features['data'], tf.uint8)
image.set_shape([28 * 28])
# Normalize the values of the image from the range
# [0, 255] to [-0.5, 0.5]
image = tf.cast(image, tf.float32) / 255 - 0.5
label = tf.cast(features['label'], tf.int32)
key = tf.cast(features['key'], tf.string)
return image, tf.one_hot(label, 10), key
if mode == tf.estimator.ModeKeys.TRAIN:
tfrecords_files = train_tfrecords
elif mode == tf.estimator.ModeKeys.EVAL:
tfrecords_files = eval_tfrecords
else:
assert mode == tf.estimator.ModeKeys.PREDICT, 'invalid mode'
tfrecords_files = eval_tfrecords
for tfrecords_file in tfrecords_files:
assert tf.gfile.Exists(tfrecords_file), (
'Run github.com:tensorflow/models/official/mnist/'
'convert_to_records.py first to convert the MNIST data to '
'TFRecord file format.')
dataset = tf.data.TFRecordDataset(tfrecords_files)
# For training, repeat the dataset forever
if mode == tf.estimator.ModeKeys.TRAIN:
dataset = dataset.repeat()
# Map example_parser over dataset, and batch results by up to batch_size
dataset = dataset.map(
example_parser, num_parallel_calls=1).prefetch(batch_size)
dataset = dataset.batch(batch_size)
images, labels, keys = dataset.make_one_shot_iterator().get_next()
return {'images': images, 'keys': keys}, labels
def train_input_fn():
return input_fn(tf.estimator.ModeKeys.TRAIN)
def eval_input_fn():
return input_fn(tf.estimator.ModeKeys.EVAL)
def predict_input_fn():
return input_fn(tf.estimator.ModeKeys.PREDICT)
def mnist_model(inputs, mode):
"""Takes the MNIST inputs and mode and outputs a tensor of logits."""
# Input Layer
# Reshape X to 4-D tensor: [batch_size, width, height, channels]
# MNIST images are 28x28 pixels, and have one color channel
inputs = tf.reshape(inputs, [-1, 28, 28, 1])
data_format = 'channels_last'
if tf.test.is_built_with_cuda():
# When running on GPU, transpose the data from channels_last (NHWC) to
# channels_first (NCHW) to improve performance. See
# https://www.tensorflow.org/performance/performance_guide#data_formats
data_format = 'channels_first'
inputs = tf.transpose(inputs, [0, 3, 1, 2])
# Convolutional Layer #1
# Computes 32 features using a 5x5 filter with ReLU activation.
# Padding is added to preserve width and height.
# Input Tensor Shape: [batch_size, 28, 28, 1]
# Output Tensor Shape: [batch_size, 28, 28, 32]
conv1 = tf.layers.conv2d(
inputs=inputs,
filters=32,
kernel_size=[5, 5],
padding='same',
activation=tf.nn.relu,
data_format=data_format)
# Pooling Layer #1
# First max pooling layer with a 2x2 filter and stride of 2
# Input Tensor Shape: [batch_size, 28, 28, 32]
# Output Tensor Shape: [batch_size, 14, 14, 32]
pool1 = tf.layers.max_pooling2d(
inputs=conv1, pool_size=[2, 2], strides=2, data_format=data_format)
# Convolutional Layer #2
# Computes 64 features using a 5x5 filter.
# Padding is added to preserve width and height.
# Input Tensor Shape: [batch_size, 14, 14, 32]
# Output Tensor Shape: [batch_size, 14, 14, 64]
conv2 = tf.layers.conv2d(
inputs=pool1,
filters=64,
kernel_size=[5, 5],
padding='same',
activation=tf.nn.relu,
data_format=data_format)
# Pooling Layer #2
# Second max pooling layer with a 2x2 filter and stride of 2
# Input Tensor Shape: [batch_size, 14, 14, 64]
# Output Tensor Shape: [batch_size, 7, 7, 64]
pool2 = tf.layers.max_pooling2d(
inputs=conv2, pool_size=[2, 2], strides=2, data_format=data_format)
# Flatten tensor into a batch of vectors
# Input Tensor Shape: [batch_size, 7, 7, 64]
# Output Tensor Shape: [batch_size, 7 * 7 * 64]
pool2_flat = tf.reshape(pool2, [-1, 7 * 7 * 64])
# Dense Layer
# Densely connected layer with 1024 neurons
# Input Tensor Shape: [batch_size, 7 * 7 * 64]
# Output Tensor Shape: [batch_size, 1024]
dense = tf.layers.dense(
inputs=pool2_flat, units=1024, activation=tf.nn.relu)
# Add dropout operation; 0.6 probability that element will be kept
dropout = tf.layers.dropout(
inputs=dense, rate=0.4, training=(mode == tf.estimator.ModeKeys.TRAIN))
# Logits layer
# Input Tensor Shape: [batch_size, 1024]
# Output Tensor Shape: [batch_size, 10]
logits = tf.layers.dense(inputs=dropout, units=10)
return logits
def model_fn(features, labels=None, mode=tf.estimator.ModeKeys.TRAIN):
"""Model function for MNIST."""
keys = features['keys']
features = features['images']
logits = mnist_model(features, mode)
predictions = {
'classes': tf.argmax(input=logits, axis=1),
'probabilities': tf.nn.softmax(logits, name='softmax_tensor'),
'keys': keys,
}
if mode == tf.estimator.ModeKeys.PREDICT:
return tf.estimator.EstimatorSpec(mode=mode, predictions=predictions)
loss = tf.losses.softmax_cross_entropy(onehot_labels=labels, logits=logits)
# Configure the training op
if mode == tf.estimator.ModeKeys.TRAIN:
optimizer = tf.train.AdamOptimizer(learning_rate=1e-4)
train_op = optimizer.minimize(loss,
tf.train.get_or_create_global_step())
else:
train_op = None
accuracy = tf.metrics.accuracy(
tf.argmax(labels, axis=1), predictions['classes'])
metrics = {'accuracy': accuracy}
with tf.name_scope('train_metrics'):
# Create a tensor named train_accuracy for logging purposes
tf.summary.scalar('train_accuracy', accuracy[1])
tf.summary.scalar('train_loss', loss)
return tf.estimator.EstimatorSpec(
mode=mode,
predictions=predictions,
loss=loss,
train_op=train_op,
eval_metric_ops=metrics)
estimator = tf.estimator.Estimator(
model_fn=model_fn, model_dir=model_dir, params=None, config=run_config)
output = train_tfrecords[0]
db = Database()
data, labels = db.data(groups='train')
# output = eval_tfrecords[0]
# db = Database()
# data, labels = db.data(groups='test')
samples = zip(data, labels, (str(i) for i in range(len(data))))
def reader(sample):
return sample