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

Interface Summary

Interface	Description
Cache.MatchPredicate<T>	Used by {#link #removeKeysMatching(Object)} to decide things that are matching.
LongPrimitiveIterator	Adds notion of iterating over long primitives in the style of an Iterator -- as opposed to iterating over Long.
Retriever<K,V>	Implementations can retrieve a value for a given key.
RunningAverage	Interface for classes that can keep track of a running average of a series of numbers.
RunningAverageAndStdDev	Extends RunningAverage by adding standard deviation too.
SkippingIterator<V>	Adds ability to skip ahead in an iterator, perhaps more efficiently than by calling Iterator.next() repeatedly.

Class Summary

Class	Description
AbstractLongPrimitiveIterator
Cache<K,V>	An efficient Map-like class which caches values for keys.
FastByIDMap<V>
FastIDSet
FastMap<K,V>	This is an optimized Map implementation, based on algorithms described in Knuth's "Art of Computer Programming", Vol.
FixedRunningAverage	A simple class that represents a fixed value of an average and count.
FixedRunningAverageAndStdDev	A simple class that represents a fixed value of an average, count and standard deviation.
FullRunningAverage	A simple class that can keep track of a running average of a series of numbers.
FullRunningAverageAndStdDev	Extends FullRunningAverage to add a running standard deviation computation.
InvertedRunningAverage
InvertedRunningAverageAndStdDev
LongPrimitiveArrayIterator	While long[] is an Iterable, it is not an Iterable<Long>.
RefreshHelper	A helper class for implementing Refreshable.
SamplingLongPrimitiveIterator	Wraps a LongPrimitiveIterator and returns only some subset of the elements that it would, as determined by a sampling rate parameter.
WeightedRunningAverage
WeightedRunningAverageAndStdDev	This subclass also provides for a weighted estimate of the sample standard deviation.