[jira] [Updated] (SPARK-41775) Implement training functions as input

["Rithwik Ediga Lakhamsani (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-41775?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rithwik Ediga Lakhamsani updated SPARK-41775:
---------------------------------------------
    Component/s: ML

> Implement training functions as input
> -------------------------------------
>
>                 Key: SPARK-41775
>                 URL: https://issues.apache.org/jira/browse/SPARK-41775
>             Project: Spark
>          Issue Type: Sub-task
>          Components: ML, PySpark
>    Affects Versions: 3.4.0
>            Reporter: Rithwik Ediga Lakhamsani
>            Priority: Major
>
> Currently, `Distributor().run(...)` takes only files as input. Now we will add in additional functionality to take in functions as well. This will require us to go through the following process on each task in the executor nodes:
> 1. take the input function and args and pickle them
> 2. Create a temp train.py file that looks like
> ```python
> import cloudpickle
> import os
> if __name__ == "__main__":
>     train, args = cloudpickle.load(f"\{tempdir}/train_input.pkl")
>     output = train(*args)
>     if output and os.environ.get("RANK", "") == "0": # this is for partitionId == 0
>         cloudpickle.dump(f"\{tempdir}/train_output.pkl")
> ```
> 3. Run that train.py file with `torchrun`
> 4. Check if `train_output.pkl` has been created on process on partitionId == 0, if it has, then deserialize it and return that output



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