Added support for:
Evaluate the recommender based on IR and RMSE, NMAE and MAE measures.
Evaluate on Splits (using cross validation techniques) based on IR and RMSE, NMAE and NMAE measures.
Added evaluation_report to metrics.
Added evaluation_error to metrics.
Added basic implementation for evaluate method in CfEvaluator.
Added implementation of Evaluation at CfEvaluator
Added tests for CfEvaluator( RMSE, NMAE, MAE)
Added tests for Precision,Recall and F1-Score at CFEvaluator.
Added tests for evaluate_on_split for RMSE, NMAE and MAE.
Added tests for Precision, Recall and F1-Score to Evaluate_On_split
Added examples to CfEvaluator.
Removed examples from sampling.