class_docstr: Convert corner boxes to center boxes using numpy.
  Corner boxes are encoded as (xmin, ymin, xmax, ymax)
  Center boxes are encoded as (center_x, center_y, width, height)
  
  Parameters
  ----------
  split : bool
      Whether split boxes to individual elements after processing.
  axis : int, default is -1
      Effective axis of the bounding box. Default is -1(the last dimension).
  
  Returns
  -------
   A BxNx4 NDArray if split is False, or 4 BxNx1 NDArray if split is True
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code: def __init__(self, axis=-1, split=False):
      super(NumPyBBoxCornerToCenter, self).__init__()
      self._split = split
      self._axis = axis
  
imports: from __future__ import absolute_import
  import numpy
  from mxnet import gluon
label_desc: Use image node_id 1 to create a new NumPyBBoxCornerToCenter object from inherited base classes: object with example: obj = NumPyBBoxCornerToCenter(axis, split)