GenericItemBasedRecommender.estimate(id) mehod

[sam wu]

I found GenericItemBasedRecommender.estimate(id) method confusing (line
347-349)
Mahout 0.9 snapshot
--------

 if (excludeItemIfNotSimilarToAll || !Double.isNaN(estimate)) {  -- line 347

          average.addDatum(estimate);

        }

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line 347 seems logic confusing,

if excludeItemIfNotSimilarToAll == true, -> always add data into average,
doesn't matter what the data is , Nan ???


Sam