def METHOD_NAME(tmp_path):
    p = tmp_path / "feats.scp"
    p2 = tmp_path / "feats.ark"
    with kaldiio.WriteHelper(f"ark,scp:{p2},{p}") as w:
        w["a"] = np.random.randn(100, 80)
        w["b"] = np.random.randn(150, 80)
    return str(p)