# Copyright 2017 The TensorFlow Authors. All Rights Reserved.
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# Licensed under the Apache License, Version 2.0 (the "License");
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# ==============================================================================

"""Contains classes specifying naming conventions used for object detection.


Specifies:
  InputDataFields: standard fields used by reader/preprocessor/batcher.
  DetectionResultFields: standard fields returned by object detector.
  BoxListFields: standard field used by BoxList
  TfExampleFields: standard fields for tf-example data format (go/tf-example).
"""


class InputDataFields(object):
  """Names for the input tensors.

  Holds the standard data field names to use for identifying input tensors. This
  should be used by the decoder to identify keys for the returned tensor_dict
  containing input tensors. And it should be used by the model to identify the
  tensors it needs.

  Attributes:
    image: image.
    image_additional_channels: additional channels.
    original_image: image in the original input size.
    original_image_spatial_shape: image in the original input size.
    key: unique key corresponding to image.
    source_id: source of the original image.
    filename: original filename of the dataset (without common path).
    groundtruth_image_classes: image-level class labels.
    groundtruth_image_confidences: image-level class confidences.
    groundtruth_labeled_classes: image-level annotation that indicates the
      classes for which an image has been labeled.
    groundtruth_boxes: coordinates of the ground truth boxes in the image.
    groundtruth_classes: box-level class labels.
    groundtruth_track_ids: box-level track ID labels.
    groundtruth_confidences: box-level class confidences. The shape should be
      the same as the shape of groundtruth_classes.
    groundtruth_label_types: box-level label types (e.g. explicit negative).
    groundtruth_is_crowd: [DEPRECATED, use groundtruth_group_of instead]
      is the groundtruth a single object or a crowd.
    groundtruth_area: area of a groundtruth segment.
    groundtruth_difficult: is a `difficult` object
    groundtruth_group_of: is a `group_of` objects, e.g. multiple objects of the
      same class, forming a connected group, where instances are heavily
      occluding each other.
    proposal_boxes: coordinates of object proposal boxes.
    proposal_objectness: objectness score of each proposal.
    groundtruth_instance_masks: ground truth instance masks.
    groundtruth_instance_boundaries: ground truth instance boundaries.
    groundtruth_instance_classes: instance mask-level class labels.
    groundtruth_keypoints: ground truth keypoints.
    groundtruth_keypoint_visibilities: ground truth keypoint visibilities.
    groundtruth_keypoint_weights: groundtruth weight factor for keypoints.
    groundtruth_label_weights: groundtruth label weights.
    groundtruth_weights: groundtruth weight factor for bounding boxes.
    groundtruth_dp_num_points: The number of DensePose sampled points for each
      instance.
    groundtruth_dp_part_ids: Part indices for DensePose points.
    groundtruth_dp_surface_coords: Image locations and UV coordinates for
      DensePose points.
    num_groundtruth_boxes: number of groundtruth boxes.
    is_annotated: whether an image has been labeled or not.
    true_image_shapes: true shapes of images in the resized images, as resized
      images can be padded with zeros.
    multiclass_scores: the label score per class for each box.
    context_features: a flattened list of contextual features.
    context_feature_length: the fixed length of each feature in
      context_features, used for reshaping.
    valid_context_size: the valid context size, used in filtering the padded
      context features.
    image_format: format for the images, used to decode
    image_height: height of images, used to decode
    image_width: width of images, used to decode
  """
  image = 'image'
  image_additional_channels = 'image_additional_channels'
  original_image = 'original_image'
  original_image_spatial_shape = 'original_image_spatial_shape'
  key = 'key'
  source_id = 'source_id'
  filename = 'filename'
  groundtruth_image_classes = 'groundtruth_image_classes'
  groundtruth_image_confidences = 'groundtruth_image_confidences'
  groundtruth_labeled_classes = 'groundtruth_labeled_classes'
  groundtruth_boxes = 'groundtruth_boxes'
  groundtruth_classes = 'groundtruth_classes'
  groundtruth_track_ids = 'groundtruth_track_ids'
  groundtruth_confidences = 'groundtruth_confidences'
  groundtruth_label_types = 'groundtruth_label_types'
  groundtruth_is_crowd = 'groundtruth_is_crowd'
  groundtruth_area = 'groundtruth_area'
  groundtruth_difficult = 'groundtruth_difficult'
  groundtruth_group_of = 'groundtruth_group_of'
  proposal_boxes = 'proposal_boxes'
  proposal_objectness = 'proposal_objectness'
  groundtruth_instance_masks = 'groundtruth_instance_masks'
  groundtruth_instance_boundaries = 'groundtruth_instance_boundaries'
  groundtruth_instance_classes = 'groundtruth_instance_classes'
  groundtruth_keypoints = 'groundtruth_keypoints'
  groundtruth_keypoint_visibilities = 'groundtruth_keypoint_visibilities'
  groundtruth_keypoint_weights = 'groundtruth_keypoint_weights'
  groundtruth_label_weights = 'groundtruth_label_weights'
  groundtruth_weights = 'groundtruth_weights'
  groundtruth_dp_num_points = 'groundtruth_dp_num_points'
  groundtruth_dp_part_ids = 'groundtruth_dp_part_ids'
  groundtruth_dp_surface_coords = 'groundtruth_dp_surface_coords'
  num_groundtruth_boxes = 'num_groundtruth_boxes'
  is_annotated = 'is_annotated'
  true_image_shape = 'true_image_shape'
  multiclass_scores = 'multiclass_scores'
  context_features = 'context_features'
  context_feature_length = 'context_feature_length'
  valid_context_size = 'valid_context_size'
  image_timestamps = 'image_timestamps'
  image_format = 'image_format'
  image_height = 'image_height'
  image_width = 'image_width'


class DetectionResultFields(object):
  """Naming conventions for storing the output of the detector.

  Attributes:
    source_id: source of the original image.
    key: unique key corresponding to image.
    detection_boxes: coordinates of the detection boxes in the image.
    detection_scores: detection scores for the detection boxes in the image.
    detection_multiclass_scores: class score distribution (including background)
      for detection boxes in the image including background class.
    detection_classes: detection-level class labels.
    detection_masks: contains a segmentation mask for each detection box.
    detection_surface_coords: contains DensePose surface coordinates for each
      box.
    detection_boundaries: contains an object boundary for each detection box.
    detection_keypoints: contains detection keypoints for each detection box.
    detection_keypoint_scores: contains detection keypoint scores.
    num_detections: number of detections in the batch.
    raw_detection_boxes: contains decoded detection boxes without Non-Max
      suppression.
    raw_detection_scores: contains class score logits for raw detection boxes.
    detection_anchor_indices: The anchor indices of the detections after NMS.
    detection_features: contains extracted features for each detected box
      after NMS.
  """

  source_id = 'source_id'
  key = 'key'
  detection_boxes = 'detection_boxes'
  detection_scores = 'detection_scores'
  detection_multiclass_scores = 'detection_multiclass_scores'
  detection_features = 'detection_features'
  detection_classes = 'detection_classes'
  detection_masks = 'detection_masks'
  detection_surface_coords = 'detection_surface_coords'
  detection_boundaries = 'detection_boundaries'
  detection_keypoints = 'detection_keypoints'
  detection_keypoint_scores = 'detection_keypoint_scores'
  detection_embeddings = 'detection_embeddings'
  num_detections = 'num_detections'
  raw_detection_boxes = 'raw_detection_boxes'
  raw_detection_scores = 'raw_detection_scores'
  detection_anchor_indices = 'detection_anchor_indices'


class BoxListFields(object):
  """Naming conventions for BoxLists.

  Attributes:
    boxes: bounding box coordinates.
    classes: classes per bounding box.
    scores: scores per bounding box.
    weights: sample weights per bounding box.
    objectness: objectness score per bounding box.
    masks: masks per bounding box.
    boundaries: boundaries per bounding box.
    keypoints: keypoints per bounding box.
    keypoint_visibilities: keypoint visibilities per bounding box.
    keypoint_heatmaps: keypoint heatmaps per bounding box.
    densepose_num_points: number of DensePose points per bounding box.
    densepose_part_ids: DensePose part ids per bounding box.
    densepose_surface_coords: DensePose surface coordinates per bounding box.
    is_crowd: is_crowd annotation per bounding box.
  """
  boxes = 'boxes'
  classes = 'classes'
  scores = 'scores'
  weights = 'weights'
  confidences = 'confidences'
  objectness = 'objectness'
  masks = 'masks'
  boundaries = 'boundaries'
  keypoints = 'keypoints'
  keypoint_visibilities = 'keypoint_visibilities'
  keypoint_heatmaps = 'keypoint_heatmaps'
  densepose_num_points = 'densepose_num_points'
  densepose_part_ids = 'densepose_part_ids'
  densepose_surface_coords = 'densepose_surface_coords'
  is_crowd = 'is_crowd'
  group_of = 'group_of'
  track_ids = 'track_ids'


class PredictionFields(object):
  """Naming conventions for standardized prediction outputs.

  Attributes:
    feature_maps: List of feature maps for prediction.
    anchors: Generated anchors.
    raw_detection_boxes: Decoded detection boxes without NMS.
    raw_detection_feature_map_indices: Feature map indices from which each raw
      detection box was produced.
  """
  feature_maps = 'feature_maps'
  anchors = 'anchors'
  raw_detection_boxes = 'raw_detection_boxes'
  raw_detection_feature_map_indices = 'raw_detection_feature_map_indices'


class TfExampleFields(object):
  """TF-example proto feature names for object detection.

  Holds the standard feature names to load from an Example proto for object
  detection.

  Attributes:
    image_encoded: JPEG encoded string
    image_format: image format, e.g. "JPEG"
    filename: filename
    channels: number of channels of image
    colorspace: colorspace, e.g. "RGB"
    height: height of image in pixels, e.g. 462
    width: width of image in pixels, e.g. 581
    source_id: original source of the image
    image_class_text: image-level label in text format
    image_class_label: image-level label in numerical format
    image_class_confidence: image-level confidence of the label
    object_class_text: labels in text format, e.g. ["person", "cat"]
    object_class_label: labels in numbers, e.g. [16, 8]
    object_bbox_xmin: xmin coordinates of groundtruth box, e.g. 10, 30
    object_bbox_xmax: xmax coordinates of groundtruth box, e.g. 50, 40
    object_bbox_ymin: ymin coordinates of groundtruth box, e.g. 40, 50
    object_bbox_ymax: ymax coordinates of groundtruth box, e.g. 80, 70
    object_view: viewpoint of object, e.g. ["frontal", "left"]
    object_truncated: is object truncated, e.g. [true, false]
    object_occluded: is object occluded, e.g. [true, false]
    object_difficult: is object difficult, e.g. [true, false]
    object_group_of: is object a single object or a group of objects
    object_depiction: is object a depiction
    object_is_crowd: [DEPRECATED, use object_group_of instead]
      is the object a single object or a crowd
    object_segment_area: the area of the segment.
    object_weight: a weight factor for the object's bounding box.
    instance_masks: instance segmentation masks.
    instance_boundaries: instance boundaries.
    instance_classes: Classes for each instance segmentation mask.
    detection_class_label: class label in numbers.
    detection_bbox_ymin: ymin coordinates of a detection box.
    detection_bbox_xmin: xmin coordinates of a detection box.
    detection_bbox_ymax: ymax coordinates of a detection box.
    detection_bbox_xmax: xmax coordinates of a detection box.
    detection_score: detection score for the class label and box.
  """
  image_encoded = 'image/encoded'
  image_format = 'image/format'  # format is reserved keyword
  filename = 'image/filename'
  channels = 'image/channels'
  colorspace = 'image/colorspace'
  height = 'image/height'
  width = 'image/width'
  source_id = 'image/source_id'
  image_class_text = 'image/class/text'
  image_class_label = 'image/class/label'
  image_class_confidence = 'image/class/confidence'
  object_class_text = 'image/object/class/text'
  object_class_label = 'image/object/class/label'
  object_bbox_ymin = 'image/object/bbox/ymin'
  object_bbox_xmin = 'image/object/bbox/xmin'
  object_bbox_ymax = 'image/object/bbox/ymax'
  object_bbox_xmax = 'image/object/bbox/xmax'
  object_view = 'image/object/view'
  object_truncated = 'image/object/truncated'
  object_occluded = 'image/object/occluded'
  object_difficult = 'image/object/difficult'
  object_group_of = 'image/object/group_of'
  object_depiction = 'image/object/depiction'
  object_is_crowd = 'image/object/is_crowd'
  object_segment_area = 'image/object/segment/area'
  object_weight = 'image/object/weight'
  instance_masks = 'image/segmentation/object'
  instance_boundaries = 'image/boundaries/object'
  instance_classes = 'image/segmentation/object/class'
  detection_class_label = 'image/detection/label'
  detection_bbox_ymin = 'image/detection/bbox/ymin'
  detection_bbox_xmin = 'image/detection/bbox/xmin'
  detection_bbox_ymax = 'image/detection/bbox/ymax'
  detection_bbox_xmax = 'image/detection/bbox/xmax'
  detection_score = 'image/detection/score'

# Sequence fields for SequenceExample inputs.
# All others are considered context fields.
SEQUENCE_FIELDS = [InputDataFields.image,
                   InputDataFields.source_id,
                   InputDataFields.groundtruth_boxes,
                   InputDataFields.num_groundtruth_boxes,
                   InputDataFields.groundtruth_classes,
                   InputDataFields.groundtruth_weights,
                   InputDataFields.source_id,
                   InputDataFields.is_annotated]
