# What does this PR do?
It is important to verify large checkpoints downloaded via `llama model
download` because subtle corruptions can easily happen with large file
system writes. This PR adds a `verify-download` subcommand. Note that
verification itself is a very time consuming process (and will take
several **minutes** for the 405B model), hence this is a separate
subcommand (and not part of the download which can already be
time-consuming) and there are spinners and a bit of a "show" around it
in the implementation.
## Test Plan
<img width="1012" alt="image"
src="https://github.com/user-attachments/assets/f82b0d42-2a15-4917-b85e-6d3cd7d31e55">
