code: def build_param_doc(arg_names, arg_types, arg_descs, remove_dup=True):
      
      param_keys = set()
      param_str = []
      for key, type_info, desc in zip(arg_names, arg_types, arg_descs):
          if key in param_keys and remove_dup:
              continue
          if key == 'num_args':
              continue
          param_keys.add(key)
          ret = '%s : %s' % (key, type_info)
          if len(desc) != 0:
              ret += '\n    ' + desc
          param_str.append(ret)
      doc_str = ('Parameters\n' +
                 '----------\n' +
                 '%s\n')
      doc_str = doc_str % ('\n'.join(param_str))
      return doc_str
docs: Build argument docs in python style.
  
      arg_names : list of str
          Argument names.
  
      arg_types : list of str
          Argument type information.
  
      arg_descs : list of str
          Argument description information.
  
      remove_dup : boolean, optional
          Whether remove duplication or not.
  
      Returns
      -------
      docstr : str
          Python docstring of parameter sections.