model_type = "5PL"
model_param_dict = {
    # ==== preprocess: normalize each feature ==== #
    # 'norm_type':'none', 
    'norm_type': 'clip_0to1', # rescale to within [0, 1]

    # ==== postprocess: clip final quality score ==== #
    'score_clip':[0.0, 100.0], # clip to within [0, 100]
}