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LightGBM doesn't have smart defaults for bagging_freq and bagging_fraction, so when boosting_type=rf, we have to manually set bagging_fraction < 1.0 with bagging_freq=0. We choose bagging_fraction = 0.9, although we didn't test for an 'ideal' value, nor did LightGBM have a recommended value, so this number can be updated whenever necessary.
Thanks @bchen1116 . Yep, agreed, we may be able to find a better default for the value of 0.9 for bagging_fraction. Having this value for now is preferable to having more "magic" behavior where the actual value passed to lightgbm changes.
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