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

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

Class org.apache.mahout.cf.taste.impl.common.FastIDSet

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

org.apache.mahout.cf.taste.impl.common.FastIDSet.intersectionSize()
Convenience method to quickly compute just the size of the intersection with another . @param other to intersect with @return number of elements in intersection

  @Override
  public int getNumUsersWithPreferenceFor(long itemID1, long itemID2) throws TasteException {
    FastIDSet userIDs1 = userIDsFromItemCache.get(itemID1);
    FastIDSet userIDs2 = userIDsFromItemCache.get(itemID2);
    return userIDs1.size() < userIDs2.size()
        ? userIDs2.intersectionSize(userIDs1)
        : userIDs1.intersectionSize(userIDs2);
  }


  @Override
  public void setPreference(long userID, long itemID, float value) {

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    FastIDSet userIDs2 = preferenceForItems.get(itemID2);
    if (userIDs2 == null) {
      return 0;
    }
    return userIDs1.size() < userIDs2.size() ?
        userIDs2.intersectionSize(userIDs1) :
        userIDs1.intersectionSize(userIDs2);
  }
  
  @Override
  public void removePreference(long userID, long itemID) {

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  @Override
  public int getNumUsersWithPreferenceFor(long itemID1, long itemID2) throws TasteException {
    FastIDSet userIDs1 = userIDsFromItemCache.get(itemID1);
    FastIDSet userIDs2 = userIDsFromItemCache.get(itemID2);
    return userIDs1.size() < userIDs2.size() ?
        userIDs2.intersectionSize(userIDs1) :
        userIDs1.intersectionSize(userIDs2);
  }


  @Override
  public void setPreference(long userID, long itemID, float value) {

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