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

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

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  @Test
  public void testMostSimilarItemPairsReducer() throws Exception {
    Reducer<EntityEntityWritable,DoubleWritable,EntityEntityWritable,DoubleWritable>.Context context =
      EasyMock.createMock(Reducer.Context.class);

    context.write(new EntityEntityWritable(123L, 456L), new DoubleWritable(0.5));

    EasyMock.replay(context);

    new MostSimilarItemPairsReducer().reduce(new EntityEntityWritable(123L, 456L),
        Arrays.asList(new DoubleWritable(0.5), new DoubleWritable(0.5)), context);

    EasyMock.verify(context);
  }
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      long itemID = indexItemIDMap.get(itemIDIndex);
      for (SimilarItem similarItem : topKMostSimilarItems.getTopItems()) {
        long otherItemID = similarItem.getItemID();
        if (itemID < otherItemID) {
          ctx.write(new EntityEntityWritable(itemID, otherItemID), new DoubleWritable(similarItem.getSimilarity()));
        } else {
          ctx.write(new EntityEntityWritable(otherItemID, itemID), new DoubleWritable(similarItem.getSimilarity()));
        }
      }
    }
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      float itemAValue = first.getPrefValue();
      for (int j = i + 1; j < size; j++) {
        EntityPrefWritable second = prefs.get(j);
        long itemBID = second.getID();
        float itemBValue = second.getPrefValue();
        context.write(new EntityEntityWritable(itemAID, itemBID), new FloatWritable(itemBValue - itemAValue));
      }
    }
  }
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      long itemID = indexItemIDMap.get(itemIDIndex);
      for (SimilarItem similarItem : topKMostSimilarItems.retrieve()) {
        long otherItemID = similarItem.getItemID();
        if (itemID < otherItemID) {
          ctx.write(new EntityEntityWritable(itemID, otherItemID), new DoubleWritable(similarItem.getSimilarity()));
        } else {
          ctx.write(new EntityEntityWritable(otherItemID, itemID), new DoubleWritable(similarItem.getSimilarity()));
        }
      }
    }
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    indexItemIDMap.put(56, 56L);

    Mapper<IntWritable,VectorWritable,EntityEntityWritable,DoubleWritable>.Context context =
      EasyMock.createMock(Mapper.Context.class);

    context.write(new EntityEntityWritable(34L, 56L), new DoubleWritable(0.9));

    EasyMock.replay(context);

    Vector vector = new RandomAccessSparseVector(Integer.MAX_VALUE);
    vector.set(12, 0.2);
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  @Test
  public void testMostSimilarItemPairsReducer() throws Exception {
    Reducer<EntityEntityWritable,DoubleWritable,EntityEntityWritable,DoubleWritable>.Context context =
      EasyMock.createMock(Reducer.Context.class);

    context.write(new EntityEntityWritable(123L, 456L), new DoubleWritable(0.5));

    EasyMock.replay(context);

    new ItemSimilarityJob.MostSimilarItemPairsReducer().reduce(new EntityEntityWritable(123L, 456L),
        Arrays.asList(new DoubleWritable(0.5), new DoubleWritable(0.5)), context);

    EasyMock.verify(context);
  }
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Related Classes of org.apache.mahout.cf.taste.hadoop.EntityEntityWritable

  • org.apache.mahout.cf.taste.hadoop.similarity.item.ItemSimilarityJob$MostSimilarItemPairsMapper
  • org.apache.mahout.cf.taste.hadoop.similarity.item.ItemSimilarityJobTest
  • org.apache.mahout.cf.taste.hadoop.similarity.item.ItemSimilarityTest
  • org.apache.mahout.cf.taste.hadoop.similarity.item.MostSimilarItemPairsMapper
  • org.apache.mahout.cf.taste.hadoop.slopeone.SlopeOnePrefsToDiffsReducer
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