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  1. Spark
  2. SPARK-14311

Model persistence in SparkR 2.0

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    • Type: Umbrella
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 2.0.0
    • Component/s: ML, SparkR
    • Labels:
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    • Target Version/s:

      Description

      In Spark 2.0, we are going to have 4 ML models in SparkR: GLMs, k-means, naive Bayes, and AFT survival regression. Users can fit models, get summary, and make predictions. However, they cannot save/load the models yet.

      ML models in SparkR are wrappers around ML pipelines. So it should be straightforward to implement model persistence. We need to think more about the API. R uses save/load for objects and datasets (also objects). It is possible to overload save for ML models, e.g., save.NaiveBayesWrapper. But I'm not sure whether load can be overloaded easily. I propose the following API:

      model <- glm(formula, data = df)
      ml.save(model, path, mode = "overwrite")
      model2 <- ml.load(path)
      

      We defined wrappers as S4 classes. So `ml.save` is an S4 method and ml.load is a S3 method (correct me if I'm wrong).

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              • Assignee:
                mengxr Xiangrui Meng
                Reporter:
                mengxr Xiangrui Meng
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