# 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.
# ==============================================================================

r"""Tool to export an object detection model for inference.

Prepares an object detection tensorflow graph for inference using model
configuration and an optional trained checkpoint. Outputs inference
graph, associated checkpoint files, a frozen inference graph and a
SavedModel (https://tensorflow.github.io/serving/serving_basic.html).

The inference graph contains one of three input nodes depending on the user
specified option.
  * `image_tensor`: Accepts a uint8 4-D tensor of shape [None, None, None, 3]
  * `encoded_image_string_tensor`: Accepts a 1-D string tensor of shape [None]
    containing encoded PNG or JPEG images. Image resolutions are expected to be
    the same if more than 1 image is provided.
  * `tf_example`: Accepts a 1-D string tensor of shape [None] containing
    serialized TFExample protos. Image resolutions are expected to be the same
    if more than 1 image is provided.

and the following output nodes returned by the model.postprocess(..):
  * `num_detections`: Outputs float32 tensors of the form [batch]
      that specifies the number of valid boxes per image in the batch.
  * `detection_boxes`: Outputs float32 tensors of the form
      [batch, num_boxes, 4] containing detected boxes.
  * `detection_scores`: Outputs float32 tensors of the form
      [batch, num_boxes] containing class scores for the detections.
  * `detection_classes`: Outputs float32 tensors of the form
      [batch, num_boxes] containing classes for the detections.
  * `detection_masks`: Outputs float32 tensors of the form
      [batch, num_boxes, mask_height, mask_width] containing predicted instance
      masks for each box if its present in the dictionary of postprocessed
      tensors returned by the model.

Notes:
 * This tool uses `use_moving_averages` from eval_config to decide which
   weights to freeze.

Example Usage:
--------------
python export_inference_graph \
    --input_type image_tensor \
    --pipeline_config_path path/to/ssd_inception_v2.config \
    --trained_checkpoint_prefix path/to/model.ckpt \
    --output_directory path/to/exported_model_directory

The expected output would be in the directory
path/to/exported_model_directory (which is created if it does not exist)
with contents:
 - graph.pbtxt
 - model.ckpt.data-00000-of-00001
 - model.ckpt.info
 - model.ckpt.meta
 - frozen_inference_graph.pb
 + saved_model (a directory)

Config overrides (see the `config_override` flag) are text protobufs
(also of type pipeline_pb2.TrainEvalPipelineConfig) which are used to override
certain fields in the provided pipeline_config_path.  These are useful for
making small changes to the inference graph that differ from the training or
eval config.

Example Usage (in which we change the second stage post-processing score
threshold to be 0.5):

python export_inference_graph \
    --input_type image_tensor \
    --pipeline_config_path path/to/ssd_inception_v2.config \
    --trained_checkpoint_prefix path/to/model.ckpt \
    --output_directory path/to/exported_model_directory \
    --config_override " \
            model{ \
              faster_rcnn { \
                second_stage_post_processing { \
                  batch_non_max_suppression { \
                    score_threshold: 0.5 \
                  } \
                } \
              } \
            }"
"""
import tensorflow as tf
from google.protobuf import text_format
from object_detection import exporter
from object_detection.protos import pipeline_pb2

slim = tf.contrib.slim
flags = tf.app.flags

flags.DEFINE_string('input_type', 'image_tensor', 'Type of input node. Can be '
                    'one of [`image_tensor`, `encoded_image_string_tensor`, '
                    '`tf_example`]')
flags.DEFINE_string('input_shape', None,
                    'If input_type is `image_tensor`, this can explicitly set '
                    'the shape of this input tensor to a fixed size. The '
                    'dimensions are to be provided as a comma-separated list '
                    'of integers. A value of -1 can be used for unknown '
                    'dimensions. If not specified, for an `image_tensor, the '
                    'default shape will be partially specified as '
                    '`[None, None, None, 3]`.')
flags.DEFINE_string('pipeline_config_path', None,
                    'Path to a pipeline_pb2.TrainEvalPipelineConfig config '
                    'file.')
flags.DEFINE_string('trained_checkpoint_prefix', None,
                    'Path to trained checkpoint, typically of the form '
                    'path/to/model.ckpt')
flags.DEFINE_string('output_directory', None, 'Path to write outputs.')
flags.DEFINE_string('config_override', '',
                    'pipeline_pb2.TrainEvalPipelineConfig '
                    'text proto to override pipeline_config_path.')
tf.app.flags.mark_flag_as_required('pipeline_config_path')
tf.app.flags.mark_flag_as_required('trained_checkpoint_prefix')
tf.app.flags.mark_flag_as_required('output_directory')
FLAGS = flags.FLAGS


def main(_):
  pipeline_config = pipeline_pb2.TrainEvalPipelineConfig()
  with tf.gfile.GFile(FLAGS.pipeline_config_path, 'r') as f:
    text_format.Merge(f.read(), pipeline_config)
  text_format.Merge(FLAGS.config_override, pipeline_config)
  if FLAGS.input_shape:
    input_shape = [
        int(dim) if dim != '-1' else None
        for dim in FLAGS.input_shape.split(',')
    ]
  else:
    input_shape = None
  exporter.export_inference_graph(FLAGS.input_type, pipeline_config,
                                  FLAGS.trained_checkpoint_prefix,
                                  FLAGS.output_directory, input_shape)


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