Submissions are evaluated on [area under the ROC curve](http://en.wikipedia.org/wiki/Receiver_operating_characteristic) between the predicted probability and the observed target.

## Submission File
For each ID in the test set, you must predict a probability for the `has_cactus` variable. The file should contain a header and have the following format:

    id,has_cactus
    000940378805c44108d287872b2f04ce.jpg,0.5
    0017242f54ececa4512b4d7937d1e21e.jpg,0.5
    001ee6d8564003107853118ab87df407.jpg,0.5
    etc.