Hi Sandeep
I think you should use testRatings.mapToPair instead of testRatings.map.
So the code should be
JavaPairRDD<Integer,Integer> usersProducts = training.mapToPair(
new PairFunction<Rating, Integer, Integer>() {
public Tuple2<Integer, Integer> call(Rating r) throws
Exception {
return new Tuple2<Integer, Integer>(r.user(),
r.product());
}
}
);
It works on my side.
Wisely Chen
On Wed, May 28, 2014 at 6:27 AM, Sandeep Parikh <sand...@clusterbeep.org>wrote:
> I've got a trained MatrixFactorizationModel via ALS.train(...) and now I'm
> trying to use it to predict some ratings like so:
>
> JavaRDD<Rating> predictions = model.predict(usersProducts.rdd())
>
> Where usersProducts is built from an existing Ratings dataset like so:
>
> JavaPairRDD<Integer,Integer> usersProducts = testRatings.map(
> new PairFunction<Rating, Integer, Integer>() {
> public Tuple2<Integer, Integer> call(Rating r) throws Exception {
> return new Tuple2<Integer, Integer>(r.user(), r.product());
> }
> }
> );
>
> The problem is that model.predict(...) doesn't like usersProducts,
> claiming that the method doesn't accept an RDD of type Tuple2 however the
> docs show the method signature as follows:
>
> def predict(usersProducts: RDD[(Int, Int)]): RDD[Rating]
>
> Am I missing something? The JavaRDD is just a list of Tuple2 elements,
> which would match the method signature but the compile is complaining.
>
> Thanks!
>
>
