Initial score is 0.427
Initial score is 0.427

Checking the original notebook again, after having now validated many notebooks, I see that the final model was trained on the training subset used in cross-validation, not on the entire dataset. I have fixed this and the score increased to 0.427.
seg/2016-ml-contest,seg/2016-ml-contest,seg/2016-ml-contest,seg/2016-ml-contest