Add counters reference-getters for PrecisionRecallLayer #594
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There are many ML problems where TP/FP/FN/TN counters make sense, however they differ in terms of how these counters should be calculated. It would be nice to re-use PrecisionRecallLayer through inheritance for these ML problems.
Currently PrecisionRecallLayer counters are private, so they are inaccessible in the inherited classes, and one can not change the way these counters are calculated.
PR adds virtual reference-getters and uses them instead of direct changes of member variables. Now inherited classes have an access to the counters, and if this access is not sufficient somehow, it is possible to override the getters to use some other member variables.