Examples of SamplingLongPrimitiveIterator

net.myrrix.common.collection.SamplingLongPrimitiveIterator
Wraps a {@link LongPrimitiveIterator} and returns only some subset of the elements that it would,as determined by a sampling rate parameter. Adapted from the same class in Mahout 0.8. @author Sean Owen @author Mahout @since 1.0
org.apache.mahout.cf.taste.impl.common.SamplingLongPrimitiveIterator
Wraps an {@link Iterator} and returns only some subset of the elements that it would, as determined by asampling rate parameter.

Examples of net.myrrix.common.collection.SamplingLongPrimitiveIterator

                                              LongPrimitiveIterator stream,
                                              int streamSize, 
                                              RandomGenerator random) {
    LongPrimitiveIterator it;
    if (n < streamSize) {
      it = new SamplingLongPrimitiveIterator(random, stream, (double) n / streamSize);      
    } else {
      it = stream;
    }
    FastIDSet chosen = new FastIDSet(n);    
    while (it.hasNext()) {

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Examples of org.apache.mahout.cf.taste.impl.common.SamplingLongPrimitiveIterator

    LongPrimitiveIterator preferredItemIDsIterator = new LongPrimitiveArrayIterator(preferredItemIDs);
    if (preferredItemIDs.length > maxItems) {
      double samplingRate = (double) maxItems / preferredItemIDs.length;
//      log.info("preferredItemIDs.length {}, samplingRate {}", preferredItemIDs.length, samplingRate);
      preferredItemIDsIterator = 
          new SamplingLongPrimitiveIterator(preferredItemIDsIterator, samplingRate);
    }
    FastIDSet possibleItemsIDs = new FastIDSet();
    while (preferredItemIDsIterator.hasNext()) {
      long itemID = preferredItemIDsIterator.nextLong();
      PreferenceArray prefs = dataModel.getPreferencesForItem(itemID);

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Examples of org.apache.mahout.cf.taste.impl.common.SamplingLongPrimitiveIterator

  }


  private void addSomeOf(FastIDSet possibleItemIDs, FastIDSet itemIDs) {
    if (itemIDs.size() > maxItemsPerUser) {
      LongPrimitiveIterator it =
          new SamplingLongPrimitiveIterator(itemIDs.iterator(), (double) maxItemsPerUser / itemIDs.size());
      while (it.hasNext()) {
        possibleItemIDs.add(it.nextLong());
      }
    } else {
      possibleItemIDs.addAll(itemIDs);
    }
  }

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Examples of org.apache.mahout.cf.taste.impl.common.SamplingLongPrimitiveIterator

    LongPrimitiveIterator preferredItemIDsIterator = new LongPrimitiveArrayIterator(preferredItemIDs);
    if (preferredItemIDs.length > maxItems) {
      double samplingRate = (double) maxItems / preferredItemIDs.length;
//      log.info("preferredItemIDs.length {}, samplingRate {}", preferredItemIDs.length, samplingRate);
      preferredItemIDsIterator = 
          new SamplingLongPrimitiveIterator(preferredItemIDsIterator, samplingRate);
    }
    FastIDSet possibleItemsIDs = new FastIDSet();
    while (preferredItemIDsIterator.hasNext()) {
      long itemID = preferredItemIDsIterator.nextLong();
      PreferenceArray prefs = dataModel.getPreferencesForItem(itemID);

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Examples of org.apache.mahout.cf.taste.impl.common.SamplingLongPrimitiveIterator

  }


  private void addSomeOf(FastIDSet possibleItemIDs, FastIDSet itemIDs) {
    if (itemIDs.size() > maxItemsPerUser) {
      LongPrimitiveIterator it =
          new SamplingLongPrimitiveIterator(itemIDs.iterator(), (double) maxItemsPerUser / itemIDs.size());
      while (it.hasNext()) {
        possibleItemIDs.add(it.nextLong());
      }
    } else {
      possibleItemIDs.addAll(itemIDs);
    }
  }

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Examples of org.apache.mahout.cf.taste.impl.common.SamplingLongPrimitiveIterator

    LongPrimitiveIterator preferredItemIDsIterator = new LongPrimitiveArrayIterator(preferredItemIDs);
    if (preferredItemIDs.length > maxItems) {
      double samplingRate = (double) maxItems / preferredItemIDs.length;
//      log.info("preferredItemIDs.length {}, samplingRate {}", preferredItemIDs.length, samplingRate);
      preferredItemIDsIterator = 
          new SamplingLongPrimitiveIterator(preferredItemIDsIterator, samplingRate);
    }
    while (preferredItemIDsIterator.hasNext()) {
      long itemID = preferredItemIDsIterator.nextLong();
      PreferenceArray prefs = dataModel.getPreferencesForItem(itemID);
      int prefsLength = prefs.length();

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Examples of org.apache.mahout.cf.taste.impl.common.SamplingLongPrimitiveIterator

  }
  
  private void addSomeOf(FastIDSet possibleItemIDs, FastIDSet itemIDs) {
    if (itemIDs.size() > maxItemsPerUser) {
      LongPrimitiveIterator it =
          new SamplingLongPrimitiveIterator(itemIDs.iterator(), (double) maxItemsPerUser / itemIDs.size());
      while (it.hasNext()) {
        possibleItemIDs.add(it.nextLong());
      }
    } else {
      possibleItemIDs.addAll(itemIDs);
    }
  }

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Examples of org.apache.mahout.cf.taste.impl.common.SamplingLongPrimitiveIterator

    LongPrimitiveIterator preferredItemIDsIterator = new LongPrimitiveArrayIterator(preferredItemIDs);
    if (preferredItemIDs.length > maxItems) {
      double samplingRate = (double) maxItems / preferredItemIDs.length;
//      log.info("preferredItemIDs.length {}, samplingRate {}", preferredItemIDs.length, samplingRate);
      preferredItemIDsIterator = 
          new SamplingLongPrimitiveIterator(preferredItemIDsIterator, samplingRate);
    }
    FastIDSet possibleItemsIDs = new FastIDSet();
    while (preferredItemIDsIterator.hasNext()) {
      long itemID = preferredItemIDsIterator.nextLong();
      PreferenceArray prefs = dataModel.getPreferencesForItem(itemID);

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Examples of org.apache.mahout.cf.taste.impl.common.SamplingLongPrimitiveIterator

  }


  private void addSomeOf(FastIDSet possibleItemIDs, FastIDSet itemIDs) {
    if (itemIDs.size() > maxItemsPerUser) {
      LongPrimitiveIterator it =
          new SamplingLongPrimitiveIterator(itemIDs.iterator(), (double) maxItemsPerUser / itemIDs.size());
      while (it.hasNext()) {
        possibleItemIDs.add(it.nextLong());
      }
    } else {
      possibleItemIDs.addAll(itemIDs);
    }
  }

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