Checks if the dimensions, over which the kernels are specified, overlap.
        Returns True if they are defined on different/separate dimensions and False otherwise.

def on_separate_dims(self, other_kernel):
        """
        Checks if the dimensions, over which the kernels are specified, overlap.
        Returns True if they are defined on different/separate dimensions and False otherwise.
        """
        if isinstance(self.active_dims, slice) or isinstance(other_kernel.active_dims, slice):
            # Be very conservative for kernels defined over slices of dimensions
            return False

        if np.any(self.active_dims.reshape(-1, 1) == other_kernel.active_dims.reshape(1, -1)):
            return False

        return True