Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/20837
**[Test build #88770 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/88770/testReport)**
for PR 20837 at commit
[`8a3ce3e`](https://github.com/apache/spark/commit/8a3ce3e4958420dc5e92e7c1d31d5eab1735bb9e).
* This patch passes all tests.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* ` instr.logWarning(s\"All labels belong to a single class and
fitIntercept=false. It's a \" +`
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