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https://issues.apache.org/jira/browse/SPARK-23805?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-23805:
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Assignee: (was: Apache Spark)
> support vector-size validation and Inference
> --------------------------------------------
>
> Key: SPARK-23805
> URL: https://issues.apache.org/jira/browse/SPARK-23805
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Affects Versions: 2.4.0
> Reporter: zhengruifeng
> Priority: Major
>
> I think it maybe miningful to unify the usage of \{{AttributeGroup}} and
> support vector-size validation and inference in algs.
> My thoughts are:
> * In \{{transformSchema}}, validate the input vector-size if possible. If
> the input vector-size can be obtained from schema, check it.
> ** Suppose a \{{PCA}} estimator with k=4, the \{{transformSchema}} will
> require the vector-size to be no more than 4.
> ** Suppose a \{{PCAModel}} trained with vectors of length 10, the
> \{{transformSchema}} will require the vector-size to be 10.
> * In \{{transformSchema}}, inference the output vector-size if possible.
> ** Suppose a \{{PCA}} estimator with k=4, the \{{transformSchema}} will
> return a schema with output vector-size=4.
> ** Suppose a \{{PCAModel}} trained with k=4, the \{{transformSchema}} will
> return a schema with output vector-size=4.
> * In \{{transform}}, inference the output vector-size if possible.
> * In \{{fit}}, obtain the input vector-size from schema if possible. This
> can help eliminating redundant \{{first}} jobs.
>
> Current PR only modifies \{{PCA}} and \{{MaxAbsScaler}} to illustrate my
> idea. Since the validation and inference is quite alg-speciafic, we may need
> to sperate the task into several small subtasks.
> How do you think about this? [~srowen] [~yanboliang] [~WeichenXu123] [~mlnick]
>
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