Please read:
Sam is right about the 2nd question. Params are just used to instantiate a model, and are not changed during the lifespan of the model (unless you do it programmatically, and some params even then cannot be updated).
Please read:
Sam is right about the 2nd question. Params are just used to instantiate a model, and are not changed during the lifespan of the model (unless you do it programmatically, and some params even then cannot be updated).