def on_load_model(self, model, model_data):
        return model
Add a new segment with its own model expression.
dataset/ETHPy150Open lsbardel/python-stdnet/stdnet/odm/utils.py/JsonSerializer.on_load_model--crossover with--dataset/ETHPy150Open UDST/urbansim/urbansim/models/dcm.py/SegmentedMNLDiscreteChoiceModel.add_segment