How to specify the specific number of blocks for the generated mask？

When I use the 'Automatically generating object masks with SAM' in notebook. How can I specify the explicit number of blocks of the generated image mask?

Open the notebook section titled “Automatically generating object masks with SAM” and trace how the generated masks are configured. Clarify what “number of blocks” refers to, then determine whether the notebook exposes a setting for it or whether the limitation needs to be documented. Done means providing a precise usage answer or documenting the supported behavior.

Written by the indexing model from the issue text.