code: def bbox_to_ybox(bbox):
      """Convert from corner bounding box to center/shape"""
      return [
          (bbox[1] + bbox[3]) / 2,
          (bbox[0] + bbox[2]) / 2,
          (bbox[3] - bbox[1]),
          (bbox[2] - bbox[0]),
      ]
  
file_path: turicreate/src/python/turicreate/toolkits/object_detector/_detection.py
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import numpy
label_desc: Use image node_id 2 for calling a global function with example usage: bbox_to_ybox(bbox) and returns: list