code: def get_parameters(params=None, path='', grad_only=True):
      
  
      global current_scope
      if params is None:
          params = OrderedDict()
      for k, v in iteritems(current_scope):
          if isinstance(v, dict):
              with parameter_scope(k):
                  params = get_parameters(
                      params, '/'.join([path, k]) if path else k, grad_only=grad_only)
          else:
              assert isinstance(v, nn.Variable)
              if not grad_only or v.need_grad:
                  params['/'.join([path, k]) if path else k] = v
      return params
docs: Get parameter Variables under the current parameter scope.
  
      Args:
          params (dict): Internal use. User doesn't set it manually.
          path (str): Internal use.  User doesn't set it manually.
          grad_only (bool): Retrieve all parameters under the current scope if
              False, while only parameters with need_grad=True are retrieved
              if True.
  
      Returns:
          dict: {:obj:`str` : :obj:`~nnabla.Variable`}