Provide a function to change the binarisation threshold

[exalate-issue-sync]

A customer needs to change the threshold that is used to binarise the predicted class probabilities. The only way now is to change the default_threshold in model.ini, so it would be better if the user could change that threshold directly on a model object and then the new threshold would be used both in the binary model or MOJO. E.g.:

{code:r}
model <- h2o.randomForest(...)
h2o.set_threshold(model, 0.6)
{code}

[h2o-ops]

JIRA Issue Migration Info

Jira Issue: PUBDEV-7353
Assignee: Veronika Maurerová
Reporter: Vaclav
State: Resolved
Fix Version: 3.30.0.2
Attachments: N/A
Development PRs: Available

Linked PRs from JIRA

#4552
#4466