mahout0.9注意事项SlopeOneRecommender

1、今天试验SlopeOne推荐算法，结果没有提示。心想是不是少了jar包，查查不少。通过网络查询定位此类所在的位置为：org.apache.mahout.cf.taste.impl.recommender.slopeone.包下面，所以去查看jar包，发现没有。查看src包也没有这个类的源码，之后去官网查看，一看，才知道这个算法已被移除了在0.9上。如果想用的话需要0.8.

1 February 2014 - Apache Mahout 0.9 released

Apache Mahout has reached version 0.9. All developers are encouraged to begin using version 0.9. Highlights include:

    New and improved Mahout website based on Apache CMS - MAHOUT-1245
    Early implementation of a Multi Layer Perceptron (MLP) classifier - MAHOUT-1265
    Scala DSL Bindings for Mahout Math Linear Algebra. See this blogpost and MAHOUT-1297
    Recommenders as Search. See [https://github.com/pferrel/solr-recommender] and MAHOUT-1288
    Support for easy functional Matrix views and derivatives - MAHOUT-1300
    JSON output format for ClusterDumper - MAHOUT-1343
    Enabled randomised testing for all Mahout modules using Carrot RandomizedRunner - MAHOUT-1345
    Online Algorithm for computing accurate Quantiles using 1-dimensional Clustering - See this pdf and MAHOUT-1361
    Upgrade to Lucene 4.6.1 - MAHOUT-1364

Changes in 0.9 are detailed in the release notes.

The following algorithms that were marked deprecated in 0.8 have been removed in 0.9:

    Switched LDA implementation from Gibbs Sampling to Collapsed Variational Bayes
    Meanshift - removed due to lack of actual usage and support
    MinHash - removed due to lack of actual usage and support
    Winnow - removed due to lack of actual usage and support
    Perceptron - removed due to lack of actual usage and support
    Slope One - removed due to lack of actual usage
    Distributed Pseudo recommender - removed due to lack of actual usage
    TreeClusteringRecommender - removed due to lack of actual usage