Github user zhengruifeng closed the pull request at:
https://github.com/apache/spark/pull/16457
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GitHub user zhengruifeng opened a pull request:
https://github.com/apache/spark/pull/16457
[SPARK-19057][ML] Instances' weight must be non-negative
## What changes were proposed in this pull request?
1, add non-negative checking in `Instance`
2, fix doc
## How was
