SparkQA commented on issue #26370: [SPARK-29727][ML][PYTHON] Use UnaryTransformer as parent class for single input column transformers in PySpark URL: https://github.com/apache/spark/pull/26370#issuecomment-549067993 **[Test build #113134 has started](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/113134/testReport)** for PR 26370 at commit [`7c03320`](https://github.com/apache/spark/commit/7c0332072bd5b2c0a6f57987c165936aa69cd78a).
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