fix: allow wandb config value changes on resume

[gkaplun-nvidia]

Summary

Add allow_val_change=True to wandb.config.update() calls in both WandbLogger and MLflowWandbLogger.

Problem

When resuming a wandb run, config.update() raises an error if a hyperparameter key already exists with a different value. This is common when hyperparameters are re-logged on resume (e.g., if the config is passed again during setup()).

Fix

Pass allow_val_change=True so that config values can be overwritten without raising. This matches the expected behavior for resumed runs where the same config is re-applied.

Test plan

• Resume a wandb run and verify config updates don't crash
• Verify new config values are reflected in the wandb dashboard

Summary by CodeRabbit

• Bug Fixes
  • Improved hyperparameter logging to correctly handle configuration updates when values change across experiment runs.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 78131fa3-6f77-4557-8da4-cae39c6dd7f7

📥 Commits

Reviewing files that changed from the base of the PR and between 9feb4b0 and 57b9da1.

📒 Files selected for processing (1)

• nemo_rl/utils/logger.py

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📝 Walkthrough

Walkthrough

Updated hyperparameter logging in both WandbLogger and SwanlabLogger classes to pass allow_val_change=True parameter to the self.run.config.update() method, enabling hyperparameter value changes during repeated updates in run configurations.

Changes

Cohort / File(s)	Summary
Hyperparameter Logging Configuration nemo_rl/utils/logger.py	Updated log_hyperparams methods in WandbLogger and SwanlabLogger to pass allow_val_change=True to self.run.config.update() calls, allowing hyperparameter values to be updated when they differ on repeated configurations.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly addresses the main change: enabling wandb config value changes during run resume by passing allow_val_change=True to config.update() calls.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Test Results For Major Changes	✅ Passed	PR contains only minor changes (2-line bug fix) adding allow_val_change=True parameter to config.update() calls without introducing features, breaking changes, or significant refactoring.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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