def METHOD_NAME(csv_float):
    dataset = IterableESPnetDataset(
        path_name_type_list=[(csv_float, "data8", "csv_float")],
        preprocess=preprocess,
    )
    for key, data in dataset:
        if key == "a":
            assert all((data["data8"]) == np.array([1.4, 3.4], dtype=np.float32))
        if key == "b":
            assert all((data["data8"]) == np.array([0.9, 9.3], dtype=np.float32))