test(temporal): use unsafe_diff for tests
from math import pi as PI
import torch
from torch import nn, optim
-from neurodiffeq.neurodiffeq import safe_diff as diff
+from neurodiffeq.neurodiffeq import unsafe_diff as diff
from neurodiffeq.networks import FCNN
from neurodiffeq.temporal import generator_1dspatial, generator_temporal
from neurodiffeq.temporal import generator_2dspatial_segment, generator_2dspatial_rectangle
