Update forward for eval/inference pass in FlowMatching models

[anteju]

What does this PR do ?

This PR disables SSL masking when using forward, and enables SSL masking when using forward_eval which keeps validation masking and can be used in SSL pretraining.

Collection: audio

Changelog

• Added forward_internal
• Added forward_eval which will use SSL masking, if available
• Disable SSL masking when using forward for inference, to avoid the model applying validation masking on the input

Usage

N/A

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 30.48%. Comparing base (09186c3) to head (5a382d5).
Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12056      +/-   ##
==========================================
+ Coverage   30.30%   30.48%   +0.17%     
==========================================
  Files        1387     1395       +8     
  Lines      176283   177070     +787     
  Branches    27091    27147      +56     
==========================================
+ Hits        53423    53980     +557     
- Misses     118776   118982     +206     
- Partials     4084     4108      +24     

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[Kuray107]

Looks good to me!

[racoiaws]

LGTM

Would be nice to have tests for forward passes
Feel free to merge if you feel it is out of scope for this PR.