code: def _return_zero(self, t, y, v):  # noqa
      return 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 15 for calling the ForwardSDE obj's underlying member method code with example usage: obj._return_zero(t, y, v) and returns: int