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This operator makes automatic predictions (filtering) about the interests of a user by collecting preferences or taste information from many users (collaborating). The underlying assumption of the collaborative filtering approach is that if a person A has the same opinion as a person B on an issue, A is more likely to have B's opinion on a different issue than that of a randomly chosen person. For example, a collaborative filtering recommendation system for television tastes could make predictions about which television show a user should like given a partial list of that user's tastes (likes or dislikes). Note that these predictions are specific to the user, but use information gleaned from many users.

Operator Usage in Easy Mode

1. Click + on the parent node.
2. Enter the Predict Ratings operator in the search field and select the operator from the Results to open the operator form.
3. In the Table drop-down, enter or select the name of the table to apply the prediction.
4. In the Model Name drop-down, enter or select the name of the model.
5. In the Users Column drop-down, enter or select a users’ column.
6. In the Items Column drop-down, enter or select an items column.
7. Click Run to view the result.
8. Click Save to add the operator to the playbook.
9. Click Cancel to discard the operator form.

Usage Details

```scala LQL Command createRatingModel(table, modelName, user, item, rating) // table: input table // modelName: name of a model to store // user: username column or you can treat is as field1 // item: item column e.g. field2 // rating: rating column (numeric), e.g. metric column // This operator will create a model that will learn rating of the metric field based on collaborative filtering and will store it as a "modelName" file name that was provided by user predictRating(table, modelName, user, item) //table: input table //modelName: name of the model that was given during createRatingModel operator //user: username column e.g. field1 //item: item column e.g. field2 // This operator will create a "prediction" column which is the prediction of rating based on the (username, item) from the training dataset.

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