updating sparsity test

        Test multitask StratifiedSplitter class

        """

        #ensure sparse dataset is actually sparse

        sparse_dataset = self.load_sparse_multitask_dataset()

        sparse_np_list = sparse_dataset.to_numpy()

        sparse_np = sparse_np_list[1]

        frac_train = 0.8

        cutoff = frac_train * len(sparse_np)

        sparse_np = sparse_np[:cutoff]

        sparse_df = pd.DataFrame(data = sparse_np)

        total_rows = len(sparse_df.index)

        sparse_flag = False

                assert NaN_count == total_rows

                break

        if not sparse_flag:

            print("datset isn't sparse")

            print("dataset isn't sparse")

            assert sparse_flag is True

        else:

            print("dataset is sparse")