Github user myui commented on a diff in the pull request:
https://github.com/apache/incubator-hivemall/pull/111#discussion_r136030303
--- Diff: core/src/main/java/hivemall/recommend/SlimUDTF.java ---
@@ -217,13 +347,48 @@ private void train(int i, Map<?, ?> Ri, Map<?, ?>
topKRatesOfI, int j, Map<?, ?>
double eui = rui - predict(u, i, topKRatesOfI, j);
gradSum += ruj * eui;
rateSum += ruj * ruj;
- errs += eui * eui;
+
+ if (this.numIterations > 1){
+ this.A.unsafeSet((int) u, j, ruj); // need optimize
+ }
}
gradSum /= N;
rateSum /= N;
- errs /= N;
+ this.W.unsafeSet(i, j, getUpdateTerm(gradSum, rateSum));
+ }
+
+
+// private void train(int i, Map<?, ?> Ri, Map<?, ?> topKRatesOfI, int
j, Map<?, ?> Rj) {
+// int N = Rj.size();
+// double gradSum = 0.d;
+// double rateSum = 0.d;
+// double errs = 0.d;
+// for (Map.Entry<?, ?> userRate : Rj.entrySet()) {
+// Object u = userRate.getKey();
+// double ruj =
PrimitiveObjectInspectorUtils.getDouble(userRate.getValue(),
+// this.itemJRateValueOI);
+// double rui = 0.d;
+// if (Ri.containsKey(u)) {
+// rui = PrimitiveObjectInspectorUtils.getDouble(Ri.get(u),
this.itemIRateValueOI);
+// }
+//
+// double eui = rui - predict(u, i, topKRatesOfI, j);
+// gradSum += ruj * eui;
+// rateSum += ruj * ruj;
+// errs += eui * eui;
+// }
+//
+// gradSum /= N;
+// rateSum /= N;
+// errs /= N;
+//
+// this.loss += errs;
+// this.W.unsafeSet(i, j, getUpdateTerm(gradSum, rateSum));
+// }
+
+ private double getUpdateTerm(double gradSum, double rateSum){
--- End diff --
`private static double getUpdateTerm(final double gradSum, final double
rateSum, final double l1) {`
for inline optimization.
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