def label_selector(labels, sel_index):
    """This Function allows you to easily parse out specific Trial's Labels for K-Fold validation
    and Test Set Separation

    Parameters:
    ----------
    labels: list
        list of labels for all epochs for one day
        [Epoch] -> [Labels]
    sel_index: list
        list of indexs to be used to construct new set of epochs

    Returns:
    --------
    sel_labels: list
        list of each Epoch/Samples labels
        [Epoch] -> [labels]
    """

    sel_labels = []
    for i in range(len(sel_index)):
        sel_labels.append(labels[sel_index[i]])
    return sel_labels