get_enriched_themes     Find enriched themes in a storyset of interest
                        relative to a background storyset.
get_similar_stories     Recommend stories similar to a user-selected
                        one.
print_tree              Theme hierarchy tree view.
story                   Story objects
story_ids_by_theme      Story theme summary
story_keywords          Story keywords
story_metadata          Story metadata
story_settings          Story settings
story_themes            Themed stories
storysets               Storysets objects
theme                   Theme objects
theme_dict              Theme dictionary
