Package org.apache.mahout.cf.taste.impl.common

Examples of org.apache.mahout.cf.taste.impl.common.FastIDSet.removeAll()

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    DataModel dataModel = getDataModel();
    FastIDSet possibleItemIDs = new FastIDSet();
    for (long userID : theNeighborhood) {
      possibleItemIDs.addAll(dataModel.getItemIDsFromUser(userID));
    }
    possibleItemIDs.removeAll(dataModel.getItemIDsFromUser(theUserID));
    return possibleItemIDs;
  }
 
  @Override
  public void refresh(Collection<Refreshable> alreadyRefreshed) {
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      for (int i = 0; i < size; i++) {
        long userID = prefs.get(i).getUserID();
        possibleItemsIDs.addAll(model.getItemIDsFromUser(userID));
      }
    }
    possibleItemsIDs.removeAll(itemIDs);
    return TopItems.getTopItems(howMany, possibleItemsIDs.iterator(), null, estimator);
  }
 
  protected float doEstimatePreference(long userID, long itemID) throws TasteException {
    double preference = 0.0;
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    DataModel dataModel = getDataModel();
    FastIDSet possibleItemIDs = new FastIDSet();
    for (long userID : theNeighborhood) {
      possibleItemIDs.addAll(dataModel.getItemIDsFromUser(userID));
    }
    possibleItemIDs.removeAll(dataModel.getItemIDsFromUser(theUserID));
    return possibleItemIDs;
  }
 
  @Override
  public String toString() {
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    DataModel dataModel = getDataModel();
    FastIDSet possibleItemIDs = new FastIDSet();
    for (long userID : theNeighborhood) {
      possibleItemIDs.addAll(dataModel.getItemIDsFromUser(userID));
    }
    possibleItemIDs.removeAll(dataModel.getItemIDsFromUser(theUserID));
    return possibleItemIDs;
  }
 
  @Override
  public void refresh(Collection<Refreshable> alreadyRefreshed) {
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    FastIDSet possibleItemIDs = new FastIDSet(dataModel.getNumItems());
    LongPrimitiveIterator allItemIDs = dataModel.getItemIDs();
    while (allItemIDs.hasNext()) {
      possibleItemIDs.add(allItemIDs.nextLong());
    }
    possibleItemIDs.removeAll(dataModel.getItemIDsFromUser(userID));
    return possibleItemIDs;
  }

}
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      for (int i = 0; i < size; i++) {
        long userID = prefs.get(i).getUserID();
        possibleItemsIDs.addAll(model.getItemIDsFromUser(userID));
      }
    }
    possibleItemsIDs.removeAll(itemIDs);
    return TopItems.getTopItems(howMany, possibleItemsIDs.iterator(), null, estimator);
  }
 
  protected float doEstimatePreference(long userID, long itemID) throws TasteException {
    double preference = 0.0;
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      int numUsersPreferringItem = itemPreferences.length();
      for (int index = 0; index < numUsersPreferringItem; index++) {
        possibleItemsIDs.addAll(dataModel.getItemIDsFromUser(itemPreferences.getUserID(index)));
      }
    }
    possibleItemsIDs.removeAll(preferredItemIDs);
    return possibleItemsIDs;
  }

}
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    DataModel dataModel = getDataModel();
    FastIDSet possibleItemIDs = new FastIDSet();
    for (long userID : theNeighborhood) {
      possibleItemIDs.addAll(dataModel.getItemIDsFromUser(userID));
    }
    possibleItemIDs.removeAll(dataModel.getItemIDsFromUser(theUserID));
    return possibleItemIDs;
  }
 
  @Override
  public String toString() {
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        for (int i = 0; i < prefsLength; i++) {
          addSomeOf(possibleItemsIDs, dataModel.getItemIDsFromUser(prefs.getUserID(i)));
        }
      }
    }
    possibleItemsIDs.removeAll(preferredItemIDs);
    return possibleItemsIDs;
  }

  private void addSomeOf(FastIDSet possibleItemIDs, FastIDSet itemIDs) {
    if (itemIDs.size() > maxItemsPerUser) {
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    DataModel dataModel = getDataModel();
    FastIDSet possibleItemIDs = new FastIDSet();
    for (long userID : theNeighborhood) {
      possibleItemIDs.addAll(dataModel.getItemIDsFromUser(userID));
    }
    possibleItemIDs.removeAll(dataModel.getItemIDsFromUser(theUserID));
    return possibleItemIDs;
  }
 
  @Override
  public void refresh(Collection<Refreshable> alreadyRefreshed) {
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