Updates: TensorFlow Decision Forests is production ready -- The TensorFlow Blog

Like all machine learning algorithms, Decision Forests have hyper-parameters. The default values of those parameters give good results, but, if you really want the best possible results for your model, you need to "tune" those parameters. TF-DF makes it easy to tune parameters. Starting with TF-DF 1.0, you can use the pre-configured hyper-parameter tuning search space. Check the hyper-parameter tuning tutorial for more details.