[python-package] [R-package] propagate the best iteration of cvbooster into the individual boosters #5066
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This propagates the
best_iteration
attribute in the Python package and thebest_iter
attribute in the R package from the CV Booster to each individual booster in the boosters list. In the Python package this ensures that callingCVBooster.predict
uses the best iteration in all boosters (closes #4777).