context: A woman dressed as Dorthy from the Wizard of Oz smiling at a baby, standing above her on a table, dressed as an elephant.
hypothesis: There is a very good chance that it is Halloween in the photo.
valid_hypothesis: There is a very good chance that it is Halloween in the photo.
invalid_hypothesis: It is probably not the case that it is Halloween in the photo.
hypothesis_assertion: It is Halloween in the photo.