code: def g_prod_and_gdg_prod_additive(self, t, y, v1, v2):
      return self.g_prod(t, y, v1), 0.0
  
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 12 for calling the ForwardSDE obj's underlying member method code with example usage: obj.g_prod_and_gdg_prod_additive(t, y, v1, v2) and returns: self,  int