classify.py

# Copyright 2016 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.
# ==============================================================================
"""Generic evaluation script that evaluates a model using a given dataset."""

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

import math
import tensorflow as tf
import urllib2

from datasets import dataset_factory
from nets import nets_factory
from preprocessing import preprocessing_factory

slim = tf.contrib.slim

tf.app.flags.DEFINE_string(
    'image_url', '', 'The url of the image to run an inference.')

tf.app.flags.DEFINE_string(
    'image_file', '', 'The name of the image to run an inference.')

tf.app.flags.DEFINE_integer(
    'batch_size', 1, 'The number of samples in each batch.')

tf.app.flags.DEFINE_integer(
    'max_num_batches', 1,
    'Max number of batches to evaluate by default use all.')

tf.app.flags.DEFINE_string(
    'master', '', 'The address of the TensorFlow master to use.')

tf.app.flags.DEFINE_string(
    'checkpoint_path', '/tmp/tfmodel/',
    'The directory where the model was written to or an absolute path to a '
    'checkpoint file.')

tf.app.flags.DEFINE_string(
    'eval_dir', '/tmp/tfmodel/', 'Directory where the results are saved to.')

tf.app.flags.DEFINE_integer(
    'num_preprocessing_threads', 4,
    'The number of threads used to create the batches.')

tf.app.flags.DEFINE_string(
    'dataset_name', 'arts', 'The name of the dataset to load.')

tf.app.flags.DEFINE_string(
    'dataset_split_name', 'test', 'The name of the train/test split.')

tf.app.flags.DEFINE_string(
    'dataset_dir', None, 'The directory where the dataset files are stored.')

tf.app.flags.DEFINE_integer(
    'labels_offset', 0,
    'An offset for the labels in the dataset. This flag is primarily used to '
    'evaluate the VGG and ResNet architectures which do not use a background '
    'class for the ImageNet dataset.')

tf.app.flags.DEFINE_string(
    'model_name', 'inception_v3', 'The name of the architecture to evaluate.')

tf.app.flags.DEFINE_string(
    'preprocessing_name', None, 'The name of the preprocessing to use. If left '
    'as `None`, then the model_name flag is used.')

tf.app.flags.DEFINE_float(
    'moving_average_decay', None,
    'The decay to use for the moving average.'
    'If left as None, then moving averages are not used.')

tf.app.flags.DEFINE_integer(
    'eval_image_size', 299, 'Eval image size')

FLAGS = tf.app.flags.FLAGS


def main(_):
  if not FLAGS.dataset_dir:
    raise ValueError('You must supply the dataset directory with --dataset_dir')

  tf.logging.set_verbosity(tf.logging.INFO)
  with tf.Graph().as_default():
    tf_global_step = slim.get_or_create_global_step()

    ######################
    # Select the dataset #
    ######################
    dataset = dataset_factory.get_dataset(
        FLAGS.dataset_name, FLAGS.dataset_split_name, FLAGS.dataset_dir)

    ####################
    # Select the model #
    ####################
    network_fn = nets_factory.get_network_fn(
        FLAGS.model_name,
        num_classes=(dataset.num_classes - FLAGS.labels_offset),
        is_training=False)

    #####################################
    # Select the preprocessing function #
    #####################################
    preprocessing_name = FLAGS.preprocessing_name or FLAGS.model_name
    image_preprocessing_fn = preprocessing_factory.get_preprocessing(
        preprocessing_name,
        is_training=False)

    eval_image_size = FLAGS.eval_image_size or network_fn.default_image_size
    if FLAGS.image_url:
        try:
            resp = urllib2.urlopen(FLAGS.image_url)
            image_data_0 = resp.read()
        except:
            raise ValueError(
                'The image url is invalid please verify the path and try again')
    elif FLAGS.image_file:
        image_data_0 = tf.gfile.FastGFile(FLAGS.image_file, 'rb').read()
    else:
        raise ValueError(
            'You must supply an image url or image file for inference')

    image_0 = tf.image.decode_jpeg(image_data_0, channels=3)
    image = image_preprocessing_fn(image_0, eval_image_size, eval_image_size)
    label = 0

    images, labels = tf.train.batch(
        [image, label],
        batch_size=1,
        num_threads=1,
        capacity=5)

    logits, _ = network_fn(images)

    tf.summary.image('inference_image', images)

    if FLAGS.moving_average_decay:
        variable_averages = tf.train.ExponentialMovingAverage(
            FLAGS.moving_average_decay, tf_global_step)
        variables_to_restore = variable_averages.variables_to_restore(
            slim.get_model_variables())
        variables_to_restore[tf_global_step.op.name] = tf_global_step
    else:
        variables_to_restore = slim.get_variables_to_restore()

    predictions = tf.argmax(logits, 1)

    num_batches = 1

    if tf.gfile.IsDirectory(FLAGS.checkpoint_path):
        checkpoint_path = tf.train.latest_checkpoint(FLAGS.checkpoint_path)
    else:
        checkpoint_path = FLAGS.checkpoint_path

    tf.logging.info('Restoring model checkpoint %s' % checkpoint_path)

    answer = slim.evaluation.evaluate_once(
        master=FLAGS.master,
        checkpoint_path=checkpoint_path,
        logdir=FLAGS.eval_dir,
        num_evals=num_batches,
        final_op=predictions,
        variables_to_restore=variables_to_restore)

    label_name = dataset.labels_to_names.get(answer[0])
    print('Answer: %s' % label_name)

if __name__ == '__main__':
  tf.app.run()