MOA is an open source framework for Big Data stream mining. It includes a collection of machine learning algorithms (classification, regression, clustering, outlier detection, concept drift detection and recommender systems) and tools for evaluation.
In the class "MembershipMatrix", the lines 43 and 44 were commented, so when it's checked in the evaluation class F1 if the classmap (mm) has a noise class (line 52) the result is always false, because the HashMap doesn't contains the key equal to -1
In the class "MembershipMatrix", the lines 43 and 44 were commented, so when it's checked in the evaluation class F1 if the classmap (mm) has a noise class (line 52) the result is always false, because the HashMap doesn't contains the key equal to -1