Add support for recommendation ALS model

Description

This issue does not include a description.

Contributor guide

Tech stack

scala

Domain

machine learningbackend

Issue type

feature

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

4

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

over 1 week

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

stale

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

mostly clear

Prerequisites

ScalaApache SparkMLeap internals

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

30

Research direction

Investigate the MLeap codebase to understand how existing ML transformers (e.g., LinearRegression, RandomForest) are implemented. Look at the Spark ML ALS class to determine the necessary parameters and serialization steps. The implementation should be added in a module like mleap core, following the patterns of other transformers. Existing comments in issue #79 may provide further guidance.