Update gbm.md

Author: krzjoa

other/gbm.md

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-### Gradient Boosting Machines
-* [InfiniteBoost](https://github.com/arogozhnikov/infiniteboost) - building infinite ensembles with gradient descent
-* [TGBoost](https://github.com/wepe/tgboost) ![alt text][skl] - Tiny Gradient Boosting Tree
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