def stamp_expt_weight(base_feature, atlas, smoothing_param, node_size,
    weight_method):
    """Constructs a string to uniquely identify a given feature extraction method."""
    expt_id = '{}_{}_smoothing{}_size{}_edgeweight_{}'.format(base_feature,
        atlas, smoothing_param, node_size, weight_method)
    return expt_id
