Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/22570
**[Test build #96694 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/96694/testReport)**
for PR 22570 at commit
[`0a01aa3`](https://github.com/apache/spark/commit/0a01aa311f038771706cb029cf89607390f0cd57).
* This patch **fails Scala style tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* ` println(\"Per-class example fractions, counts:\")`
* ` instr.logWarning(\"All labels belong to a single class and
fitIntercept=false. It's a \" +`
* ` require(className == expectedClassName, \"Error loading
metadata: Expected class name\" +`
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