code: def init_extra_solver_state(self, t0, y0):
      return self.sde.f_and_g(t0, y0) + (y0,)
  
file_path: torchsde/torchsde/_core/methods/reversible_heun.py
imports: import torch
  from ..None import adjoint_sde
  from ..None import base_solver
  from ..None import misc
  from ...settings import SDE_TYPES, NOISE_TYPES, LEVY_AREA_APPROXIMATIONS, METHODS
label_desc: Use image node_id 2 for calling the ReversibleHeun obj's underlying member method code with example usage: obj.init_extra_solver_state(t0, y0) and returns: unknown