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* [CORE] allow updating trees in an existing model * [CORE] in refresh updater, allow keeping old leaf values and update stats only * [R-package] xgb.train mod to allow updating trees in an existing model * [R-package] added check for nrounds when is_update * [CORE] merge parameter declaration changes; unify their code style * [CORE] move the update-process trees initialization to Configure; rename default process_type to 'default'; fix the trees and trees_to_update sizes comparison check * [R-package] unit tests for the update process type * [DOC] documentation for process_type parameter; improved docs for updater, Gamma and Tweedie; added some parameter aliases; metrics indentation and some were non-documented * fix my sloppy merge conflict resolutions * [CORE] add a TreeProcessType enum * whitespace fix
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