sdeint_adjoint for f_and_g_prod type SDE, how to set parameter?

[chunqishi]

I got the following errors:

File ".venv\lib\site-packages\torchsde_core\adjoint.py", line 271, in sdeint_adjoint
extra_solver_state = solver.init_extra_solver_state(ts[0], y0)
File ".venv\lib\site-packages\torchsde_core\methods\reversible_heun.py", line 59, in init_extra_solver_state
return self.sde.f_and_g(t0, y0) + (y0,)
File ".venv\lib\site-packages\torchsde_core\base_sde.py", line 92, in f_and_g_default
return self.f(t, y), self.g(t, y)
File ".venv\lib\site-packages\torchsde_core\base_sde.py", line 85, in g_default
raise RuntimeError("Method g has not been provided, but is required for this method.")
RuntimeError: Method g has not been provided, but is required for this method.