For any given classifier you create you’ll have a Sandbox version you can modify and train and a Live version. This allows you to work on your classifier in the sandbox while your production site is safely using the live version without downtimes.
Public modules only expose their live classifier since they are read only.
Deploying your Classifier
The process of copying your sandbox version to your live version is called a deploy. Only a trained sandbox classifier can be deployed. The deploy takes less than a second and you won’t experience any downtime on your live version. You can view each classifier under the Sandbox or Live tabs and deploy using the Deploy option under the Live tab.