Process a complete data set and save it as a TFRecord.

  Args:
    name: string, unique identifier specifying the data set.
    directory: string, root path to the data set.
    num_shards: integer number of shards for this data set.
    synset_to_human: dict of synset to human labels, e.g.,
      'n02119022' --> 'red fox, Vulpes vulpes'
    image_to_bboxes: dictionary mapping image file names to a list of
      bounding boxes. This list contains 0+ bounding boxes.

def _process_dataset(name, directory, num_shards, synset_to_human,
                     image_to_bboxes):
  """Process a complete data set and save it as a TFRecord.

  Args:
    name: string, unique identifier specifying the data set.
    directory: string, root path to the data set.
    num_shards: integer number of shards for this data set.
    synset_to_human: dict of synset to human labels, e.g.,
      'n02119022' --> 'red fox, Vulpes vulpes'
    image_to_bboxes: dictionary mapping image file names to a list of
      bounding boxes. This list contains 0+ bounding boxes.
  """
  filenames, synsets, labels = _find_image_files(directory, FLAGS.labels_file)
  humans = _find_human_readable_labels(synsets, synset_to_human)
  bboxes = _find_image_bounding_boxes(filenames, image_to_bboxes)
  _process_image_files(name, filenames, synsets, labels,
                       humans, bboxes, num_shards)