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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.mahout.cf.taste.eval;

/**
 * 

* Implementations encapsulate information retrieval-related statistics about a * {@link org.apache.mahout.cf.taste.recommender.Recommender}'s recommendations. *

* *

* See Information retrieval. *

*/ public interface IRStatistics { /** *

* See Precision. *

*/ double getPrecision(); /** *

* See Recall. *

*/ double getRecall(); /** *

* See Fall-Out. *

*/ double getFallOut(); /** *

* See F-measure. *

*/ double getF1Measure(); /** *

* See F-measure. *

*/ double getFNMeasure(double n); /** *

* See * Normalized Discounted Cumulative Gain. *

*/ double getNormalizedDiscountedCumulativeGain(); /** * @return the fraction of all users for whom recommendations could be produced */ double getReach(); }




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