def _get_key_name(fname):
    """An internal function used to determine the type of the current dataset.

    'original' - untouched data (not returned by this function)
    'seq' - sequencer result
    'tsne_10' - TNSE with p=10
    'tsne_50' - TNSE with p=50
    'tsne_100' - TNSE with p=100
    """
    file = str(fname)
    if "tsne" not in file:
        return "seq"

    if "p10.txt" in file:
        return "tsne_10"

    if "p50.txt" in file:
        return "tsne_50"

    if "p100.txt" in file:
        return "tsne_100"