Tensorflowで画像認識サンプルアプリケーションを作る

Python入門

Inception-v3を使って、画像識別のWebアプリケーションを作成します。

スポンサーリンク

動作環境

Django
Windows10

Inception-v3とは?

GoogleのImageNet画像認識モデルのことです。

git clone https://github.com/tensorflow/models
cd models/tutorials/image/imagenet
python classify_image.py

初回時の実行には少し時間がかかりますが待ちましょう。

下のような文字列が出現したら成功です。

giant panda, panda, panda bear, coon bear, Ailuropoda melanoleuca (score = 0.89107)
indri, indris, Indri indri, Indri brevicaudatus (score = 0.00779)
lesser panda, red panda, panda, bear cat, cat bear, Ailurus fulgens (score = 0.00296)
custard apple (score = 0.00147)
earthstar (score = 0.00117)

Webアプリケーションの作成

今回はDjangoで作っていきます。
Flaskの方が簡単に作成できるらしいのですが、自分があまりFlask詳しくないので。。。

[code]
django-admin startproject inception_app
python manage.py startapp app
[/code]

[python title=”setting.py”]
INSTALLED_APPS = [
‘django.contrib.admin’,
‘django.contrib.auth’,
‘django.contrib.contenttypes’,
‘django.contrib.sessions’,
‘django.contrib.messages’,
‘django.contrib.staticfiles’,
‘app.apps.AppConfig’,
]
[/python]

[python title=”inception_app/urls.py”]
from django.contrib import admin
from django.urls import path, include

urlpatterns = [
path(‘admin/’, admin.site.urls),
path(”, include(‘app.urls’)),
]
[/python]

[python title=”app/urls.py”]
from django.urls import path
from . import views

app_name = ‘app’
urlpatterns = [
path(”, views.index, name=’index’),
path(‘recognize/’, views.recognize, name=’recognize’),
]
[/python]

[python title=”views.py”]
from django.shortcuts import render
from . import classify_image
import tensorflow as tf

classify_image.FLAGS = tf.app.flags.FLAGS
tf.app.flags.DEFINE_string(‘model_dir’, ‘/tmp/imagenet’,
"""Path to classify_image_graph_def.pb""")
classify_image.maybe_download_and_extract()
classify_image.create_graph()
node_lookup = classify_image.NodeLookup()
sess = tf.Session()
softmax_tensor = tf.squeeze(sess.graph.get_tensor_by_name(‘softmax:0’))

def index(request):
return render(request, ‘app/index.html’, {})

def recognize(request):

file = request.FILES[‘file’]
predictions = sess.run(softmax_tensor, feed_dict={‘DecodeJpeg/contents:0’: file.read()})

results = []
top_k = predictions.argsort()[-5:][::-1]

for node_id in top_k:
human_string = node_lookup.id_to_string(node_id)
score = predictions[node_id]
results.append([human_string, score])

context = {
‘results’: results,
}
return render(request, ‘app/result.html’, context)
[/python]

[python title=”app/classify_image.py”]
# Copyright 2015 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.
# ==============================================================================

"""Simple image classification with Inception.
Run image classification with Inception trained on ImageNet 2012 Challenge data
set.
This program creates a graph from a saved GraphDef protocol buffer,
and runs inference on an input JPEG image. It outputs human readable
strings of the top 5 predictions along with their probabilities.
Change the –image_file argument to any jpg image to compute a
classification of that image.
Please see the tutorial and website for a detailed description of how
to use this script to perform image recognition.
https://tensorflow.org/tutorials/image_recognition/
"""

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

import argparse
import os.path
import re
import sys
import tarfile

import numpy as np
from six.moves import urllib
import tensorflow as tf

FLAGS = None

# pylint: disable=line-too-long
DATA_URL = ‘http://download.tensorflow.org/models/image/imagenet/inception-2015-12-05.tgz’
# pylint: enable=line-too-long

class NodeLookup(object):
"""Converts integer node ID’s to human readable labels."""

def __init__(self,
label_lookup_path=None,
uid_lookup_path=None):
if not label_lookup_path:
label_lookup_path = os.path.join(
FLAGS.model_dir, ‘imagenet_2012_challenge_label_map_proto.pbtxt’)
if not uid_lookup_path:
uid_lookup_path = os.path.join(
FLAGS.model_dir, ‘imagenet_synset_to_human_label_map.txt’)
self.node_lookup = self.load(label_lookup_path, uid_lookup_path)

def load(self, label_lookup_path, uid_lookup_path):
"""Loads a human readable English name for each softmax node.
Args:
label_lookup_path: string UID to integer node ID.
uid_lookup_path: string UID to human-readable string.
Returns:
dict from integer node ID to human-readable string.
"""
if not tf.gfile.Exists(uid_lookup_path):
tf.logging.fatal(‘File does not exist %s’, uid_lookup_path)
if not tf.gfile.Exists(label_lookup_path):
tf.logging.fatal(‘File does not exist %s’, label_lookup_path)

# Loads mapping from string UID to human-readable string
proto_as_ascii_lines = tf.gfile.GFile(uid_lookup_path).readlines()
uid_to_human = {}
p = re.compile(r'[n\d]*[ \S,]*’)
for line in proto_as_ascii_lines:
parsed_items = p.findall(line)
uid = parsed_items[0]
human_string = parsed_items[2]
uid_to_human[uid] = human_string

# Loads mapping from string UID to integer node ID.
node_id_to_uid = {}
proto_as_ascii = tf.gfile.GFile(label_lookup_path).readlines()
for line in proto_as_ascii:
if line.startswith(‘ target_class:’):
target_class = int(line.split(‘: ‘)[1])
if line.startswith(‘ target_class_string:’):
target_class_string = line.split(‘: ‘)[1]
node_id_to_uid[target_class] = target_class_string[1:-2]

# Loads the final mapping of integer node ID to human-readable string
node_id_to_name = {}
for key, val in node_id_to_uid.items():
if val not in uid_to_human:
tf.logging.fatal(‘Failed to locate: %s’, val)
name = uid_to_human[val]
node_id_to_name[key] = name

return node_id_to_name

def id_to_string(self, node_id):
if node_id not in self.node_lookup:
return ”
return self.node_lookup[node_id]

def create_graph():
"""Creates a graph from saved GraphDef file and returns a saver."""
# Creates graph from saved graph_def.pb.
with tf.gfile.FastGFile(os.path.join(
FLAGS.model_dir, ‘classify_image_graph_def.pb’), ‘rb’) as f:
graph_def = tf.GraphDef()
graph_def.ParseFromString(f.read())
_ = tf.import_graph_def(graph_def, name=”)

def run_inference_on_image(image):
"""Runs inference on an image.
Args:
image: Image file name.
Returns:
Nothing
"""
if not tf.gfile.Exists(image):
tf.logging.fatal(‘File does not exist %s’, image)
image_data = tf.gfile.FastGFile(image, ‘rb’).read()

# Creates graph from saved GraphDef.
create_graph()

with tf.Session() as sess:
# Some useful tensors:
# ‘softmax:0’: A tensor containing the normalized prediction across
# 1000 labels.
# ‘pool_3:0’: A tensor containing the next-to-last layer containing 2048
# float description of the image.
# ‘DecodeJpeg/contents:0’: A tensor containing a string providing JPEG
# encoding of the image.
# Runs the softmax tensor by feeding the image_data as input to the graph.
softmax_tensor = sess.graph.get_tensor_by_name(‘softmax:0’)
predictions = sess.run(softmax_tensor,
{‘DecodeJpeg/contents:0’: image_data})
predictions = np.squeeze(predictions)

# Creates node ID –> English string lookup.
node_lookup = NodeLookup()

top_k = predictions.argsort()[-FLAGS.num_top_predictions:][::-1]
for node_id in top_k:
human_string = node_lookup.id_to_string(node_id)
score = predictions[node_id]
print(‘%s (score = %.5f)’ % (human_string, score))

def maybe_download_and_extract():
"""Download and extract model tar file."""
dest_directory = FLAGS.model_dir
if not os.path.exists(dest_directory):
os.makedirs(dest_directory)
filename = DATA_URL.split(‘/’)[-1]
filepath = os.path.join(dest_directory, filename)
if not os.path.exists(filepath):
def _progress(count, block_size, total_size):
sys.stdout.write(‘\r>> Downloading %s %.1f%%’ % (
filename, float(count * block_size) / float(total_size) * 100.0))
sys.stdout.flush()
filepath, _ = urllib.request.urlretrieve(DATA_URL, filepath, _progress)
print()
statinfo = os.stat(filepath)
print(‘Successfully downloaded’, filename, statinfo.st_size, ‘bytes.’)
tarfile.open(filepath, ‘r:gz’).extractall(dest_directory)

def main(_):
maybe_download_and_extract()
image = (FLAGS.image_file if FLAGS.image_file else
os.path.join(FLAGS.model_dir, ‘cropped_panda.jpg’))
run_inference_on_image(image)

if __name__ == ‘__main__’:
parser = argparse.ArgumentParser()
# classify_image_graph_def.pb:
# Binary representation of the GraphDef protocol buffer.
# imagenet_synset_to_human_label_map.txt:
# Map from synset ID to a human readable string.
# imagenet_2012_challenge_label_map_proto.pbtxt:
# Text representation of a protocol buffer mapping a label to synset ID.
parser.add_argument(
‘–model_dir’,
type=str,
default=’/tmp/imagenet’,
help="""\
Path to classify_image_graph_def.pb,
imagenet_synset_to_human_label_map.txt, and
imagenet_2012_challenge_label_map_proto.pbtxt.\
"""
)
parser.add_argument(
‘–image_file’,
type=str,
default=”,
help=’Absolute path to image file.’
)
parser.add_argument(
‘–num_top_predictions’,
type=int,
default=5,
help=’Display this many predictions.’
)
FLAGS, unparsed = parser.parse_known_args()
tf.app.run(main=main, argv=[sys.argv[0]] + unparsed)
[/python]

[code title=”templates/app/index.html”]
<!DOCTYPE html>
<html>
<head>
<title>Inception App</title>
</head>
<body>
<h1>Image Recognition</h1>
<form action="recognize/" method="POST" enctype="multipart/form-data">
{% csrf_token %}
<input type="file" name="file" />
<input type="submit" />
</form>
<div class="preview"></div>
<script>
var $ = document;
var $form = $.querySelector(‘form’);// jQueryの $("form")相当

$.addEventListener(‘DOMContentLoaded’, function() {
$.querySelector(‘input[type="file"]’).addEventListener(‘change’, function(e) {
var file = e.target.files[0],
reader = new FileReader(),
$preview = $.querySelector(".preview"),
t = this;

if(file.type.indexOf("image") < 0){
return false;
}

reader.onload = (function(file) {
return function(e) {
while ($preview.firstChild) $preview.removeChild($preview.firstChild);

var img = document.createElement( ‘img’ );
img.setAttribute(‘src’, e.target.result);
img.setAttribute(‘width’, ‘150px’);
img.setAttribute(‘title’, file.name);
$preview.appendChild(img);
};
})(file);

reader.readAsDataURL(file);
});
});
</script>
</body>
</html>
[/code]

[code title=”templates/app/result.html”]
<!DOCTYPE html>
<html>
<head>
<title>Inception App</title>
</head>
<body>
<h1>Recognition results</h1>
<ol>
{% for result in results %}
<li>{{ result.0 }}({{ result.1}})</li>
{% endfor %}
</ol>
<a href="{% url ‘app:index’%}">戻る</a>
</body>
</html>
[/code]

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