File descriptions • /stage1_train/* - training set images (images and annotated masks) • /stage1_test/* - stage 1 test set images (images only, you are predicting the masks) • /stage2_test/* (released later) - stage 2 test set images (images only, you are predicting the masks) • stage1_sample_submission.csv - a submission file containing the ImageIds for which you must predict during stage 1 • stage2_sample_submission.csv (released later) - a submission file containing the ImageIds for which you must predict during stage 2 • stage1_train_labels.csv - a file showing the run-length encoded representation of the training images. This is provided as a convenience and is redundant with the mask image files.