v2.1.0

• Updated the setup file.
• Updated mealpy dependency to version 3.0.2.
• Updated citation.cff and MANIFEST.in files.
• Improved documentation, examples, and test cases.
• Updated the following modules: metrics, preprocessor, and scaler.
• Fixed a bug in get_optimizer_by_class within the base_rbf and rbf_tuner modules.
• Renamed the parameter optim_paras to optim_params.
• Removed the obj_weights parameter from NiaRbfRegressor.
• Added new parameters to the following classes: NiaRbfRegressor, NiaRbfClassifier, and NiaRbfTuner:
  • lb, ub, mode, n_workers, and termination.
• Fixed missing classes_ attribute in RbfClassifier, NiaRbfClassifier, and AdvancedRbfClassifier.
• Added pretty-printing support for all classes.