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Improve documentation and add a final to MeanResponseCombiner.

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Joel Therrien 2019-01-22 11:01:21 -08:00
parent d935fe0bc0
commit 115c57f829
1 changed files with 2 additions and 4 deletions
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src/main/java/ca/joeltherrien/randomforest/responses/regression/MeanResponseCombiner.java
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@ -21,16 +21,14 @@ import ca.joeltherrien.randomforest.tree.ResponseCombiner;
import java.util.List; import java.util.List;
/** /**
* This implementation of the collector isn't great... but good enough given that I'm not planning to fully support regression trees. * Returns the Mean value of a group of Doubles.
*
* (It's not great because you'll lose accuracy as you sum up the doubles, since dividing by n is the very last step.)
* *
*/ */
public class MeanResponseCombiner implements ResponseCombiner<Double, Double> { public class MeanResponseCombiner implements ResponseCombiner<Double, Double> {
@Override @Override
public Double combine(List<Double> responses) { public Double combine(List<Double> responses) {
double size = responses.size(); final double size = responses.size();
return responses.stream().mapToDouble(db -> db/size).sum(); return responses.stream().mapToDouble(db -> db/size).sum();