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exporter.py
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exporter.py
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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.
# ==============================================================================
"""Functions to export object detection inference graph."""
import logging
import os
import tensorflow as tf
from tensorflow.core.protobuf import rewriter_config_pb2
from tensorflow.python import pywrap_tensorflow
from tensorflow.python.client import session
from tensorflow.python.framework import graph_util
from tensorflow.python.framework import importer
from tensorflow.python.platform import gfile
from tensorflow.python.saved_model import signature_constants
from tensorflow.python.training import saver as saver_lib
from object_detection.builders import model_builder
from object_detection.core import standard_fields as fields
from object_detection.data_decoders import tf_example_decoder
slim = tf.contrib.slim
# TODO: Replace with freeze_graph.freeze_graph_with_def_protos when
# newer version of Tensorflow becomes more common.
def freeze_graph_with_def_protos(
input_graph_def,
input_saver_def,
input_checkpoint,
output_node_names,
restore_op_name,
filename_tensor_name,
clear_devices,
initializer_nodes,
optimize_graph=False,
variable_names_blacklist=''):
"""Converts all variables in a graph and checkpoint into constants."""
del restore_op_name, filename_tensor_name # Unused by updated loading code.
# 'input_checkpoint' may be a prefix if we're using Saver V2 format
if not saver_lib.checkpoint_exists(input_checkpoint):
raise ValueError(
'Input checkpoint "' + input_checkpoint + '" does not exist!')
if not output_node_names:
raise ValueError(
'You must supply the name of a node to --output_node_names.')
# Remove all the explicit device specifications for this node. This helps to
# make the graph more portable.
if clear_devices:
for node in input_graph_def.node:
node.device = ''
with tf.Graph().as_default():
tf.import_graph_def(input_graph_def, name='')
if optimize_graph:
logging.info('Graph Rewriter optimizations enabled')
rewrite_options = rewriter_config_pb2.RewriterConfig(
optimize_tensor_layout=True)
rewrite_options.optimizers.append('pruning')
rewrite_options.optimizers.append('constfold')
rewrite_options.optimizers.append('layout')
graph_options = tf.GraphOptions(
rewrite_options=rewrite_options, infer_shapes=True)
else:
logging.info('Graph Rewriter optimizations disabled')
graph_options = tf.GraphOptions()
config = tf.ConfigProto(graph_options=graph_options)
with session.Session(config=config) as sess:
if input_saver_def:
saver = saver_lib.Saver(saver_def=input_saver_def)
saver.restore(sess, input_checkpoint)
else:
var_list = {}
reader = pywrap_tensorflow.NewCheckpointReader(input_checkpoint)
var_to_shape_map = reader.get_variable_to_shape_map()
for key in var_to_shape_map:
try:
tensor = sess.graph.get_tensor_by_name(key + ':0')
except KeyError:
# This tensor doesn't exist in the graph (for example it's
# 'global_step' or a similar housekeeping element) so skip it.
continue
var_list[key] = tensor
saver = saver_lib.Saver(var_list=var_list)
saver.restore(sess, input_checkpoint)
if initializer_nodes:
sess.run(initializer_nodes)
variable_names_blacklist = (variable_names_blacklist.split(',') if
variable_names_blacklist else None)
output_graph_def = graph_util.convert_variables_to_constants(
sess,
input_graph_def,
output_node_names.split(','),
variable_names_blacklist=variable_names_blacklist)
return output_graph_def
def _image_tensor_input_placeholder():
"""Returns placeholder and input node that accepts a batch of uint8 images."""
input_tensor = tf.placeholder(dtype=tf.uint8,
shape=(None, None, None, 3),
name='image_tensor')
return input_tensor, input_tensor
def _tf_example_input_placeholder():
"""Returns input that accepts a batch of strings with tf examples.
Returns:
a tuple of placeholder and input nodes that output decoded images.
"""
batch_tf_example_placeholder = tf.placeholder(
tf.string, shape=[None], name='tf_example')
def decode(tf_example_string_tensor):
tensor_dict = tf_example_decoder.TfExampleDecoder().decode(
tf_example_string_tensor)
image_tensor = tensor_dict[fields.InputDataFields.image]
return image_tensor
return (batch_tf_example_placeholder,
tf.map_fn(decode,
elems=batch_tf_example_placeholder,
dtype=tf.uint8,
parallel_iterations=32,
back_prop=False))
def _encoded_image_string_tensor_input_placeholder():
"""Returns input that accepts a batch of PNG or JPEG strings.
Returns:
a tuple of placeholder and input nodes that output decoded images.
"""
batch_image_str_placeholder = tf.placeholder(
dtype=tf.string,
shape=[None],
name='encoded_image_string_tensor')
def decode(encoded_image_string_tensor):
image_tensor = tf.image.decode_image(encoded_image_string_tensor,
channels=3)
image_tensor.set_shape((None, None, 3))
return image_tensor
return (batch_image_str_placeholder,
tf.map_fn(
decode,
elems=batch_image_str_placeholder,
dtype=tf.uint8,
parallel_iterations=32,
back_prop=False))
input_placeholder_fn_map = {
'image_tensor': _image_tensor_input_placeholder,
'encoded_image_string_tensor':
_encoded_image_string_tensor_input_placeholder,
'tf_example': _tf_example_input_placeholder,
}
def _add_output_tensor_nodes(postprocessed_tensors,
output_collection_name='inference_op'):
"""Adds output nodes for detection boxes and scores.
Adds the following nodes for output tensors -
* num_detections: float32 tensor of shape [batch_size].
* detection_boxes: float32 tensor of shape [batch_size, num_boxes, 4]
containing detected boxes.
* detection_scores: float32 tensor of shape [batch_size, num_boxes]
containing scores for the detected boxes.
* detection_classes: float32 tensor of shape [batch_size, num_boxes]
containing class predictions for the detected boxes.
* detection_masks: (Optional) float32 tensor of shape
[batch_size, num_boxes, mask_height, mask_width] containing masks for each
detection box.
Args:
postprocessed_tensors: a dictionary containing the following fields
'detection_boxes': [batch, max_detections, 4]
'detection_scores': [batch, max_detections]
'detection_classes': [batch, max_detections]
'detection_masks': [batch, max_detections, mask_height, mask_width]
(optional).
'num_detections': [batch]
output_collection_name: Name of collection to add output tensors to.
Returns:
A tensor dict containing the added output tensor nodes.
"""
label_id_offset = 1
boxes = postprocessed_tensors.get('detection_boxes')
scores = postprocessed_tensors.get('detection_scores')
classes = postprocessed_tensors.get('detection_classes') + label_id_offset
masks = postprocessed_tensors.get('detection_masks')
num_detections = postprocessed_tensors.get('num_detections')
outputs = {}
outputs['detection_boxes'] = tf.identity(boxes, name='detection_boxes')
outputs['detection_scores'] = tf.identity(scores, name='detection_scores')
outputs['detection_classes'] = tf.identity(classes, name='detection_classes')
outputs['num_detections'] = tf.identity(num_detections, name='num_detections')
if masks is not None:
outputs['detection_masks'] = tf.identity(masks, name='detection_masks')
for output_key in outputs:
tf.add_to_collection(output_collection_name, outputs[output_key])
if masks is not None:
tf.add_to_collection(output_collection_name, outputs['detection_masks'])
return outputs
def _write_frozen_graph(frozen_graph_path, frozen_graph_def):
"""Writes frozen graph to disk.
Args:
frozen_graph_path: Path to write inference graph.
frozen_graph_def: tf.GraphDef holding frozen graph.
"""
with gfile.GFile(frozen_graph_path, 'wb') as f:
f.write(frozen_graph_def.SerializeToString())
logging.info('%d ops in the final graph.', len(frozen_graph_def.node))
def _write_saved_model(saved_model_path,
frozen_graph_def,
inputs,
outputs):
"""Writes SavedModel to disk.
If checkpoint_path is not None bakes the weights into the graph thereby
eliminating the need of checkpoint files during inference. If the model
was trained with moving averages, setting use_moving_averages to true
restores the moving averages, otherwise the original set of variables
is restored.
Args:
saved_model_path: Path to write SavedModel.
frozen_graph_def: tf.GraphDef holding frozen graph.
inputs: The input image tensor to use for detection.
outputs: A tensor dictionary containing the outputs of a DetectionModel.
"""
with tf.Graph().as_default():
with session.Session() as sess:
tf.import_graph_def(frozen_graph_def, name='')
builder = tf.saved_model.builder.SavedModelBuilder(saved_model_path)
tensor_info_inputs = {
'inputs': tf.saved_model.utils.build_tensor_info(inputs)}
tensor_info_outputs = {}
for k, v in outputs.items():
tensor_info_outputs[k] = tf.saved_model.utils.build_tensor_info(v)
detection_signature = (
tf.saved_model.signature_def_utils.build_signature_def(
inputs=tensor_info_inputs,
outputs=tensor_info_outputs,
method_name=signature_constants.PREDICT_METHOD_NAME))
builder.add_meta_graph_and_variables(
sess, [tf.saved_model.tag_constants.SERVING],
signature_def_map={
signature_constants.DEFAULT_SERVING_SIGNATURE_DEF_KEY:
detection_signature,
},
)
builder.save()
def _write_graph_and_checkpoint(inference_graph_def,
model_path,
input_saver_def,
trained_checkpoint_prefix):
for node in inference_graph_def.node:
node.device = ''
with tf.Graph().as_default():
tf.import_graph_def(inference_graph_def, name='')
with session.Session() as sess:
saver = saver_lib.Saver(saver_def=input_saver_def,
save_relative_paths=True)
saver.restore(sess, trained_checkpoint_prefix)
saver.save(sess, model_path)
def _export_inference_graph(input_type,
detection_model,
use_moving_averages,
trained_checkpoint_prefix,
output_directory,
optimize_graph=False,
output_collection_name='inference_op'):
"""Export helper."""
tf.gfile.MakeDirs(output_directory)
frozen_graph_path = os.path.join(output_directory,
'frozen_inference_graph.pb')
saved_model_path = os.path.join(output_directory, 'saved_model')
model_path = os.path.join(output_directory, 'model.ckpt')
if input_type not in input_placeholder_fn_map:
raise ValueError('Unknown input type: {}'.format(input_type))
placeholder_tensor, input_tensors = input_placeholder_fn_map[input_type]()
inputs = tf.to_float(input_tensors)
preprocessed_inputs = detection_model.preprocess(inputs)
output_tensors = detection_model.predict(preprocessed_inputs)
postprocessed_tensors = detection_model.postprocess(output_tensors)
outputs = _add_output_tensor_nodes(postprocessed_tensors,
output_collection_name)
saver = None
if use_moving_averages:
variable_averages = tf.train.ExponentialMovingAverage(0.0)
variables_to_restore = variable_averages.variables_to_restore()
saver = tf.train.Saver(variables_to_restore)
else:
saver = tf.train.Saver()
input_saver_def = saver.as_saver_def()
_write_graph_and_checkpoint(
inference_graph_def=tf.get_default_graph().as_graph_def(),
model_path=model_path,
input_saver_def=input_saver_def,
trained_checkpoint_prefix=trained_checkpoint_prefix)
frozen_graph_def = freeze_graph_with_def_protos(
input_graph_def=tf.get_default_graph().as_graph_def(),
input_saver_def=input_saver_def,
input_checkpoint=trained_checkpoint_prefix,
output_node_names=','.join(outputs.keys()),
restore_op_name='save/restore_all',
filename_tensor_name='save/Const:0',
clear_devices=True,
optimize_graph=optimize_graph,
initializer_nodes='')
_write_frozen_graph(frozen_graph_path, frozen_graph_def)
_write_saved_model(saved_model_path, frozen_graph_def, placeholder_tensor,
outputs)
def export_inference_graph(input_type,
pipeline_config,
trained_checkpoint_prefix,
output_directory,
optimize_graph=False,
output_collection_name='inference_op'):
"""Exports inference graph for the model specified in the pipeline config.
Args:
input_type: Type of input for the graph. Can be one of [`image_tensor`,
`tf_example`].
pipeline_config: pipeline_pb2.TrainAndEvalPipelineConfig proto.
trained_checkpoint_prefix: Path to the trained checkpoint file.
output_directory: Path to write outputs.
optimize_graph: Whether to optimize graph using Grappler.
output_collection_name: Name of collection to add output tensors to.
If None, does not add output tensors to a collection.
"""
detection_model = model_builder.build(pipeline_config.model,
is_training=False)
_export_inference_graph(input_type, detection_model,
pipeline_config.eval_config.use_moving_averages,
trained_checkpoint_prefix, output_directory,
optimize_graph, output_collection_name)