def METHOD_NAME(self):
    batch_matrix = torch.randn(9, 3)
    res = left_t_interp(self.batch_interp_indices, self.batch_interp_values, batch_matrix, 6)
    actual = torch.matmul(self.batch_interp_matrix.mT, batch_matrix.unsqueeze(0))
    self.assertTrue(approx_equal(res, actual))