PR and commits to merge back

[Laurae2]

@guolinke Do you have an idea which PRs and commits should be merged back to master branch?

I'm thinking about the following:

• [python] fix python memory leak #840 [python] fix python memory leak
• Remove check of max_depth #838 Remove check of max_depth
• python-package: fix version #832 python-package: fix version
• [R-package] Merge iterations and early stopping with params #829 [R-package] Merge iterations and early stopping with params
• Fix __func__ is not defined in MSVS2013 #819 Fix func is not defined in MSVS2013
• fix AMD APP SDK download link #815 fix AMD APP SDK download link
• [MRG] [python] check params for num_boost_round & early_stopping_rounds #806 [MRG] [python] check params for num_boost_round & early_stopping_rounds
• Create CODE_OF_CONDUCT.md #803 Create CODE_OF_CONDUCT.md
• Fix [R-package] Prevent remembering parameters #799 Fix [R-package] Prevent remembering parameters
• [R-package] Unhandled errors must error properly #797 [R-package] Unhandled errors must error properly
• [R-package] Prevent remembering parameters #796 [R-package] Prevent remembering parameters
• [python] fix categorical_feature in Dataset #792 [python] fix categorical_feature in Dataset
• [R-package] CV Improvements #791 [R-package] CV Improvements
• [python] Dataset params back up before training #786 [python] Dataset params back up before training
• add docs for converting model to if-else format #785 add docs for converting model to if-else format
• fix R crash problem. #784 fix R crash problem.
• Update docs #776 Update docs

Unsure if possible in the current state:

• Explain individual predictions using SHAP value feature attributions #825 Explain individual predictions using SHAP value feature attributions

There are also your commits I'm missing as they don't appear in the PRs / commit history.

[henry0312]

oh my god...

[guolinke]

sorry, I will add them back

[henry0312]

If you don't want to lose contributors, don't do any force push to master or change history of master, I think...
Good luck, @guolinke!

[wxchan]

What happened?

[henry0312]

To revert the direct support of categorical feature probably, he returned master to 64e5209, although v2.0.6 still exists.
cf. 4181fd9

[guolinke]

used cherry-pick to add these PR back.

@henry0312 sorry, I need to do this.
@wxchan sorry, your if-else change cannot be added now, I will try to add it back in future.