code: def _get_widths_heights(self, anchor_reference):
      return np.column_stack(
          (
              (anchor_reference[:, 2] - anchor_reference[:, 0] + 1),
              (anchor_reference[:, 3] - anchor_reference[:, 1] + 1),
          )
      )
  
file_path: luminoth/luminoth/utils/anchors_test.py
imports: import numpy
  import tensorflow
  from luminoth.utils.anchors import generate_anchors_reference
label_desc: Use image node_id 2 for calling the AnchorsTest obj's underlying member method code with example usage: obj._get_widths_heights(anchor_reference) and returns: np