H2o pr_auc metric can't be used

Description

The Metric based in model can be called like model.auc() to show the metric but not for pr_auc() metric.
I think this is a bug to fix in the important level.

Rebuilding the bug can be simply that training a model and calling .pr_auc() to show the error message.

Assignee

Wendy

Fix versions

Reporter

zhongtian xiao

Support ticket URL

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Priority

Major
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