Package org.apache.mahout.cf.taste.hadoop

Examples of org.apache.mahout.cf.taste.hadoop.MutableRecommendedItem

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      }
      if (itemsToRecommendFor == null || itemsToRecommendFor.contains(itemID)) {
        float value = (float) element.get();
        if (!Float.isNaN(value)) {

          MutableRecommendedItem topItem = topKItems.top();
          if (value > topItem.getValue()) {
            topItem.set(itemID, value);
            topKItems.updateTop();
          }
        }
      }
    }
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      @Override
      public boolean apply(int itemID, Vector itemFeatures) {
        if (!alreadyRatedItems.contains(itemID)) {
          double predictedRating = userFeatures.dot(itemFeatures);

          MutableRecommendedItem top = topItemsQueue.top();
          if (predictedRating > top.getValue()) {
            top.set(itemID, (float) predictedRating);
            topItemsQueue.updateTop();
          }
        }
        return true;
      }
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  @Test
  public void testAggregateAndRecommendReducer() throws Exception {
    Reducer<VarLongWritable,PrefAndSimilarityColumnWritable,VarLongWritable,RecommendedItemsWritable>.Context context =
        EasyMock.createMock(Reducer.Context.class);

    context.write(EasyMock.eq(new VarLongWritable(123L)), recommendationsMatch(new MutableRecommendedItem(1L, 2.8f),
        new MutableRecommendedItem(2L, 2.0f)));

    EasyMock.replay(context);

    RandomAccessSparseVector similarityColumnOne = new RandomAccessSparseVector(Integer.MAX_VALUE, 100);
    similarityColumnOne.set(1, 0.1);
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  @Test
  public void testAggregateAndRecommendReducerExcludeRecommendationsBasedOnOneItem() throws Exception {
    Reducer<VarLongWritable,PrefAndSimilarityColumnWritable,VarLongWritable,RecommendedItemsWritable>.Context context =
        EasyMock.createMock(Reducer.Context.class);

    context.write(EasyMock.eq(new VarLongWritable(123L)), recommendationsMatch(new MutableRecommendedItem(1L, 2.8f)));

    EasyMock.replay(context);

    RandomAccessSparseVector similarityColumnOne = new RandomAccessSparseVector(Integer.MAX_VALUE, 100);
    similarityColumnOne.set(1, 0.1);
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  @Test
  public void testAggregateAndRecommendReducerLimitNumberOfRecommendations() throws Exception {
    Reducer<VarLongWritable,PrefAndSimilarityColumnWritable,VarLongWritable,RecommendedItemsWritable>.Context context =
      EasyMock.createMock(Reducer.Context.class);

    context.write(EasyMock.eq(new VarLongWritable(123L)), recommendationsMatch(new MutableRecommendedItem(1L, 2.8f)));

    EasyMock.replay(context);

    RandomAccessSparseVector similarityColumnOne = new RandomAccessSparseVector(Integer.MAX_VALUE, 100);
    similarityColumnOne.set(1, 0.1);
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  @Test
  public void testAggregateAndRecommendReducer() throws Exception {
    Reducer<VarLongWritable,PrefAndSimilarityColumnWritable,VarLongWritable,RecommendedItemsWritable>.Context context =
        EasyMock.createMock(Reducer.Context.class);

    context.write(EasyMock.eq(new VarLongWritable(123L)), recommendationsMatch(new MutableRecommendedItem(1L, 2.8f),
        new MutableRecommendedItem(2L, 2.0f)));

    EasyMock.replay(context);

    RandomAccessSparseVector similarityColumnOne = new RandomAccessSparseVector(Integer.MAX_VALUE, 100);
    similarityColumnOne.set(1, 0.1);
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  @Test
  public void testAggregateAndRecommendReducerExcludeRecommendationsBasedOnOneItem() throws Exception {
    Reducer<VarLongWritable,PrefAndSimilarityColumnWritable,VarLongWritable,RecommendedItemsWritable>.Context context =
        EasyMock.createMock(Reducer.Context.class);

    context.write(EasyMock.eq(new VarLongWritable(123L)), recommendationsMatch(new MutableRecommendedItem(1L, 2.8f)));

    EasyMock.replay(context);

    RandomAccessSparseVector similarityColumnOne = new RandomAccessSparseVector(Integer.MAX_VALUE, 100);
    similarityColumnOne.set(1, 0.1);
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  @Test
  public void testAggregateAndRecommendReducerLimitNumberOfRecommendations() throws Exception {
    Reducer<VarLongWritable,PrefAndSimilarityColumnWritable,VarLongWritable,RecommendedItemsWritable>.Context context =
      EasyMock.createMock(Reducer.Context.class);

    context.write(EasyMock.eq(new VarLongWritable(123L)), recommendationsMatch(new MutableRecommendedItem(1L, 2.8f)));

    EasyMock.replay(context);

    RandomAccessSparseVector similarityColumnOne = new RandomAccessSparseVector(Integer.MAX_VALUE, 100);
    similarityColumnOne.set(1, 0.1);
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      if (shouldIncludeItemIntoRecommendations(itemID, itemsToRecommendFor, itemsForUser)) {

        float value = (float) element.get();
        if (!Float.isNaN(value)) {

          MutableRecommendedItem topItem = topKItems.top();
          if (value > topItem.getValue()) {
            topItem.set(itemID, value);
            topKItems.updateTop();
          }
        }
      }
    }
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Related Classes of org.apache.mahout.cf.taste.hadoop.MutableRecommendedItem

  • org.apache.mahout.cf.taste.hadoop.als.PredictionMapper
  • org.apache.mahout.cf.taste.hadoop.item.AggregateAndRecommendReducer
  • org.apache.mahout.cf.taste.hadoop.item.RecommenderJobTest
  • org.apache.mahout.cf.taste.recommender.RecommendedItem
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