import abc
import torch


class InterpolationBase(torch.nn.Module, metaclass=abc.ABCMeta):
    @property
    @abc.abstractmethod
    def grid_points(self):
        raise NotImplementedError

    @property
    @abc.abstractmethod
    def interval(self):
        raise NotImplementedError

    @abc.abstractmethod
    def evaluate(self, t):
        raise NotImplementedError

    @abc.abstractmethod
    def derivative(self, t):
        raise NotImplementedError