Release 1.8.0 Major Features And Improvements Can now pass tf.contrib.distribute.MirroredStrategy() to tf.estimator.RunConfig() to run an Estimator model on multiple GPUs on one machine. Add tf.contrib.data.prefetch_to_device(), which supports prefetching to GPU memory. Added Gradient Boosted Trees as pre-made Estimators: BoostedTreesClassifier, BoostedTreesRegressor. Add 3rd generation pipeline c