I am trying to integrate an equation from time t1 to t0, where t1 > t0. But it seems like, none of the integrators (integrate_ode_rk45, integrate_ode_bdf) support this as of now. Do you know any way to get around this?

Context: I am trying to implement adjoint method to get the gradients wrt parameters of integrated differential equation (something similar to neural-ode paper).