/// <p>
/// Like {@link #GenericItemSimilarity(Iterable)}, but will only keep the specified number of similarities
/// from the given {@link Iterable} of similarities. It will keep those with the highest similarity -- those
/// that are therefore most important.
/// </p>
///
/// <p>
/// Thanks to tsmorton for suggesting this and providing part of the implementation.
/// </p>
///
/// @param similarities
/// set of {@link ItemItemSimilarity}s on which to base this instance
/// @param maxToKeep
/// maximum number of similarities to keep
public GenericItemSimilarity(IEnumerable <ItemItemSimilarity> similarities, int maxToKeep)
{
var keptSimilarities =
TopItems.GetTopItemItemSimilarities(maxToKeep, similarities.GetEnumerator());
initSimilarityMaps(keptSimilarities.GetEnumerator());
}
/// <p>
/// Like {@link #GenericItemSimilarity(ItemSimilarity, DataModel)} )}, but will only keep the specified
/// number of similarities from the given {@link DataModel}. It will keep those with the highest similarity
/// -- those that are therefore most important.
/// </p>
///
/// <p>
/// Thanks to tsmorton for suggesting this and providing part of the implementation.
/// </p>
///
/// @param otherSimilarity
/// other {@link ItemSimilarity} to get similarities from
/// @param dataModel
/// data model to get items from
/// @param maxToKeep
/// maximum number of similarities to keep
/// @throws TasteException
/// if an error occurs while accessing the {@link DataModel} items
public GenericItemSimilarity(IItemSimilarity otherSimilarity,
IDataModel dataModel,
int maxToKeep)
{
long[] itemIDs = GenericUserSimilarity.longIteratorToList(dataModel.GetItemIDs());
var it = new DataModelSimilaritiesIterator(otherSimilarity, itemIDs);
var keptSimilarities = TopItems.GetTopItemItemSimilarities(maxToKeep, it);
initSimilarityMaps(keptSimilarities.GetEnumerator());
}