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The following page has been changed by Frederick Haebin Na: http://wiki.apache.org/hama/TraditionalCollaborativeFiltering ------------------------------------------------------------------------------ } // 2. Get the pair set of all row key combinations + // So, we don't have to recalculate the same value pair with reversed order. + // ex) similar(UserA, UserB) == similar(UserB, UserA) + // In this case, it is going to return {{1, 2}, {1, 3}, {2, 3}} + // by discarding {{2, 1}, {3, 1}, {3, 2}} from the full possible combination. Combination x = new Combination(data.length, 2); // 3. |a|·|b|cos(q) calculation
