Make Param.id public

[ArthurBrussee]

Pull Request Template

Checklist

• [ x] Confirmed that run-checks all script has been executed.
• [ x] Made sure the book is up to date with changes in this PR.

Changes

Make param id public. This can help to setup custom optimizers (by splitting of gradients for a specific param), and has had some more requests..

This could also just be a getter, replacing the id seems a bit wild but might be valid for advanced use cases.

It's also already pseudo public, as it's possible to do something like

// read:
let (id, val) = param.comsume()
// "write":
let param = ParamID::new(id, val);

[laggui]

LGTM 👏 👏

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.28%. Comparing base (d28183c) to head (30681a7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1859   +/-   ##
=======================================
  Coverage   86.28%   86.28%           
=======================================
  Files         774      774           
  Lines       90095    90095           
=======================================
  Hits        77740    77740           
  Misses      12355    12355           

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