code: def positive_axis(axis, D):
      axis = axis if axis > -1 else D + axis
      return axis
  
file_path: nnabla/python/src/nnabla/backward_function/utils.py
imports: import nnabla.functions
label_desc: Use image node_id 2 for calling a global function with example usage: positive_axis(axis, D) and returns: axis