class_docstr: Utility class to load data.
class_docstr_tok: ["Utility","class","to","load","data","."]
code: def __str__(self):
      attrs = vars(self)
      return "\n".join("%s: %s" % item for item in attrs.items())
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import copy
  import sys
  import math
  from collections import defaultdict
  import numpy
  from ppdet.modeling.bbox_utils import bbox_iou_np_expand
  from .map_utils import ap_per_class
  from .metrics import Metric
  from .munkres import Munkres
  from ppdet.utils.logger import setup_logger
label_desc: Use image node_id 2 for calling the tData obj's underlying member method code with example usage: obj.__str__() and returns: str