code: def __init__(self, rhs_str):
      self.rhs = rhs_str
  
file_path: nnabla/build-tools/code_generator/utils/load_function_rst.py
imports: import collections
  import re
  import os
label_desc: Use image node_id 1 to create a new DefaultRHS object  with example: obj = DefaultRHS(rhs_str)