code: def f_and_g_default(self, t, y):
      return self.f(t, y), self.g(t, y)
  
imports: import abc
  import torch
  from torch import nn
  from .None import misc
  from ..settings import NOISE_TYPES, SDE_TYPES
  from ..types import Tensor
label_desc: Use image node_id 4 for calling the ForwardSDE obj's underlying member method code with example usage: obj.f_and_g_default(t, y) and returns: self,  self