GBM-Benchmarks
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Cover Type training/validation/test set differs from reference
When looking at your results and all papers who compare with your results, I've been scratching my head as to how you managed such high accuracy. Now I know why from looking at your code here (thank you)! You use 60% training, 20% validation and 20% testing. However, the Cover Type's info file defines the training, validation and test sets differently. And it's very hard to even manage 80% accuracy using that.
While there is nothing wrong with your evaluation, I would put a disclaimer about this somewhere.
https://archive.ics.uci.edu/ml/machine-learning-databases/covtype/ From covtype.info:
-- Classification performance -- first 11,340 records used for training data subset -- next 3,780 records used for validation data subset -- last 565,892 records used for testing data subset -- 70% Neural Network (backpropagation) -- 58% Linear Discriminant Analysis