O nature, nature, why art thou so dishonest, as ever to send men with these false recommendations into the world!

Henry Fielding

Another common data problem is producing *recommendations* of some sort.
Netflix recommends movies you might want to watch.
Amazon recommends products you might want to buy.
Twitter recommends users you might want to follow.
In this chapter, we’ll look at several ways to use data to make recommendations.

In particular, we’ll look at the data set of `users_interests`

that we’ve used before:

`users_interests`

`=`

`[`

`[`

`"Hadoop"`

`,`

`"Big Data"`

`,`

`"HBase"`

`,`

`"Java"`

`,`

`"Spark"`

`,`

`"Storm"`

`,`

`"Cassandra"`

`],`

`[`

`"NoSQL"`

`,`

`"MongoDB"`

`,`

`"Cassandra"`

`,`

`"HBase"`

`,`

`"Postgres"`

`],`

`[`

`"Python"`

`,`

`"scikit-learn"`

`,`

`"scipy"`

`,`

`"numpy"`

`,`

`"statsmodels"`

`,`

`"pandas"`

`],`

`[`

`"R"`

`,`

`"Python"`

`,`

`"statistics"`

`,`

`"regression"`

`,`

`"probability"`

`],`

`[`

`"machine learning"`

`,`

`"regression"`

`,`

`"decision trees"`

`,`

`"libsvm"`

`],`

`[`

`"Python"`

`,`

`"R"`

`,`

`"Java"`

`,`

`"C++"`

`,`

`"Haskell"`

`,`

`"programming languages"`

`],`

`[`

`"statistics"`

`,`

`"probability"`

`,`

`"mathematics"`

`,`

`"theory"`

`],`

`[`

`"machine learning"`

`,`

`"scikit-learn"`

`,`

`"Mahout"`

`,`

`"neural networks"`

`],`

`[`

`"neural networks"`

`,`

`"deep learning"`

`,`

`"Big Data"`

`,`

`"artificial intelligence"`

`],`

`[`

`"Hadoop"`

`,`

`"Java"`

`,`

`"MapReduce"`

`,`

`"Big Data"`

`],`

`[`

`"statistics"`

`,`

`"R"`

`,`

`"statsmodels"`

`],`

`[`

`"C++"`

`,`

`"deep learning"`

`,`

`"artificial intelligence"`

`,`

`"probability"`

`],`

`[`

`"pandas"`

`,`

`"R"`

`,`

`"Python"`

`],`

`[`

`"databases"`

`,`

`"HBase"`

`,`

`"Postgres"`

`,`

`"MySQL"`

`,`

`"MongoDB"`

`],`

`[`

`"libsvm"`

`,`

`"regression"`

`,`

`"support vector machines"`

`]`

`]`

And we’ll think about the problem of recommending new ...

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