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Refactor MAB and Strategy Classes with Cold Start Methods and Enhance…
…d Validation Change log: 1. Moved Strategy, Model, and MAB to strategy.py, model.py, and to the new mab.py. base.py is now only for definitions and abstract PyBanditsBaseModel. The abstract MAB now allows for all childs to either accept strategy instance as parameter, or to get the strategy parameters and instantiate correspondingly. 2. The from_state functionality is now directly inherited by all MABs from BaseMab. 3. Replaced all cold_start methods in cmab.py and smab.py with cold_start stemming from BaseMab. Correspondingly, updated test cases to use the new cold_start_instantiate methods. 4. Introduced numerize_field and get_expected_value_from_state methods in the Strategy class to handle default values and state extraction. Added field_validator for exploit_p in BestActionIdentification and subsidy_factor in CostControlBandit to ensure proper default handling and validation. 5. Merged common functionality into a new CostControlStrategy abstract class, which is now inherited by CostControlBandit and MultiObjectiveCostControlBandit. Simplified the select_action methods by using helper methods like _evaluate_and_select and _reduce. 6. Plugged get_pareto_front into a new MultiObjectiveStrategy abstract class, which is now inherited by MultiObjectiveBandit and MultiObjectiveCostControlBandit. 7. In model.py. Removed the redundant BaseBetaMO and BaseBayesianLogisticRegression. Added cold_start_instantiate method to BetaMO and BayesianLogisticRegression models. 8. Added extract_argument_names_from_function under utils.py to allow extract function parameter names by handle. 9. Changed test_base.py into test_mab.py. 10. Updated deprecated linter settings in pyproject.toml. 11. Added test_smab_mo_cc_update test on test_smab.py. 12. Changed version to 1.0.0 on pyproject.toml.
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