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Posted to issues@spark.apache.org by "Nicholas Chammas (JIRA)" <ji...@apache.org> on 2016/08/11 19:28:20 UTC
[jira] [Comment Edited] (SPARK-17025) Cannot persist PySpark ML
Pipeline model that includes custom Transformer
[ https://issues.apache.org/jira/browse/SPARK-17025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15417788#comment-15417788 ]
Nicholas Chammas edited comment on SPARK-17025 at 8/11/16 7:27 PM:
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cc [~josephkb], [~mengxr]
I guess a first step be to add a {{_to_java}} method to the base Transformer class that simply raises {{NotImplementedError}}.
Is there a way to have the base class handle this work automatically, or do custom transformers need to each implement their own {{_to_java}} method?
was (Author: nchammas):
cc [~josephkb] [~mengxr]
> Cannot persist PySpark ML Pipeline model that includes custom Transformer
> -------------------------------------------------------------------------
>
> Key: SPARK-17025
> URL: https://issues.apache.org/jira/browse/SPARK-17025
> Project: Spark
> Issue Type: Bug
> Components: ML, PySpark
> Affects Versions: 2.0.0
> Reporter: Nicholas Chammas
> Priority: Minor
>
> Following the example in [this Databricks blog post|https://databricks.com/blog/2016/05/31/apache-spark-2-0-preview-machine-learning-model-persistence.html] under "Python tuning", I'm trying to save an ML Pipeline model.
> This pipeline, however, includes a custom transformer. When I try to save the model, the operation fails because the custom transformer doesn't have a {{_to_java}} attribute.
> {code}
> Traceback (most recent call last):
> File ".../file.py", line 56, in <module>
> model.bestModel.save('model')
> File "/usr/local/Cellar/apache-spark/2.0.0/libexec/python/lib/pyspark.zip/pyspark/ml/pipeline.py", line 222, in save
> File "/usr/local/Cellar/apache-spark/2.0.0/libexec/python/lib/pyspark.zip/pyspark/ml/pipeline.py", line 217, in write
> File "/usr/local/Cellar/apache-spark/2.0.0/libexec/python/lib/pyspark.zip/pyspark/ml/util.py", line 93, in __init__
> File "/usr/local/Cellar/apache-spark/2.0.0/libexec/python/lib/pyspark.zip/pyspark/ml/pipeline.py", line 254, in _to_java
> AttributeError: 'PeoplePairFeaturizer' object has no attribute '_to_java'
> {code}
> Looking at the source code for [ml/base.py|https://github.com/apache/spark/blob/acaf2a81ad5238fd1bc81e7be2c328f40c07e755/python/pyspark/ml/base.py], I see that not even the base Transformer class has such an attribute.
> I'm assuming this is missing functionality that is intended to be patched up (i.e. [like this|https://github.com/apache/spark/blob/acaf2a81ad5238fd1bc81e7be2c328f40c07e755/python/pyspark/ml/classification.py#L1421-L1433]).
> I'm not sure if there is an existing JIRA for this (my searches didn't turn up clear results).
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