- [x] I'd say split into `classification_evaluator` and `regression_evaluator` classes. - [x] Define metrics for `regression` case (inspiration [here](https://scikit-learn.org/stable/modules/model_evaluation.html#regression-metrics)). As for plots, maybe QQ or residuals [here](https://data.library.virginia.edu/diagnostic-plots/). Some extra inspiration also [here](https://www.statsmodels.org/stable/examples/notebooks/generated/ols.html). - [x] Document and write/modify unit tests
classification_evaluatorandregression_evaluatorclasses.regressioncase (inspiration here). As for plots, maybe QQ or residuals here. Some extra inspiration also here.