fix: speedup minimize and minimize-check in config_cli

[hemildesai]

The minimize-check llm recipes pre-commit hook was invoking ./tools/config_cli.py minimize-check once per recipe file in a bash for-loop. With ~100 recipe YAML files, this spawned 98 separate uv run --script processes, each paying the full Python/uv startup and omegaconf import cost.

Changes:

• tools/config_cli.py: Both minimize and minimize-check now accept multiple config paths (nargs='+') in a single invocation. Expanded base configs
  are cached across files, so shared parents (e.g., dpo.yaml) are only loaded once.
• .pre-commit-config.yaml: Replaced the bash for loop with a single invocation that passes all files via glob expansion.

Summary by CodeRabbit

• New Features
  • Config minimize and minimize-check commands now accept multiple configuration files in a single invocation, eliminating the need for separate runs per file.
  • Pre-commit hooks optimized to batch process configuration files more efficiently.

[coderabbitai]

📝 Walkthrough

Walkthrough

The PR refactors config_cli.py to support batch processing of multiple configuration files in a single invocation. The minimize and minimize_check commands now accept multiple configs via glob patterns, with added helper functions to process individual files and shared base config caching. Tests and pre-commit hooks are updated accordingly.

Changes

Cohort / File(s)	Summary
Config CLI Multi-Config Support tools/config_cli.py	Added _minimize_one() and _minimize_check_one() helper functions for single-file processing. Updated minimize() and minimize_check() to iterate over args.configs (list) instead of single config, with shared base_config_cache to avoid redundant base config loads. CLI argument parsing changed from single config to nargs="+" for multiple files.
Test Namespace Updates tests/unit/tools/test_config_cli.py	Updated test namespace construction to use "configs" attribute containing a list instead of single "config" attribute across multiple test cases.
Pre-commit Hook Simplification .pre-commit-config.yaml	Simplified minimize-check invocation to pass glob pattern directly as a single argument instead of looping over individual files with existence checks.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Merge Conflict Detection	⚠️ Warning	❌ Merge conflicts detected (16 files): ⚔️ .pre-commit-config.yaml (content) ⚔️ docker/Dockerfile (content) ⚔️ docs/guides/use-custom-vllm.md (content) ⚔️ examples/configs/grpo_math_1B.yaml (content) ⚔️ examples/configs/vlm_grpo_3B.yaml (content) ⚔️ examples/configs/vlm_grpo_3B_megatron.yaml (content) ⚔️ examples/nemo_gym/grpo_workplace_assistant_nemotron_nano_v2_9b.yaml (content) ⚔️ nemo_rl/algorithms/grpo.py (content) ⚔️ nemo_rl/environments/nemo_gym.py (content) ⚔️ nemo_rl/models/generation/vllm/vllm_worker.py (content) ⚔️ tests/functional/grpo_non_colocated.sh (content) ⚔️ tests/unit/algorithms/test_grpo.py (content) ⚔️ tests/unit/environments/test_nemo_gym.py (content) ⚔️ tests/unit/tools/test_config_cli.py (content) ⚔️ tools/build-custom-vllm.sh (content) ⚔️ tools/config_cli.py (content) These conflicts must be resolved before merging into main.	Resolve conflicts locally and push changes to this branch.
Test Results For Major Changes	⚠️ Warning	PR claims performance improvement but provides no before-and-after metrics, timing comparisons, or performance validation evidence.	Add concrete performance metrics to PR description including execution times, test environment details, and quantified speedup percentage, or include performance test cases.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: optimizing minimize and minimize-check by enabling batch processing of multiple config files in a single invocation, eliminating the overhead of repeated process spawns.
Docstring Coverage	✅ Passed	Docstring coverage is 83.33% which is sufficient. The required threshold is 80.00%.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch hemil/speedup-minimize-check

⚔️ Resolve merge conflicts (beta)

• Auto-commit resolved conflicts to branch hemil/speedup-minimize-check
• Create stacked PR with resolved conflicts
• Post resolved changes as copyable diffs in a comment

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@tools/config_cli.py`:
- Around line 370-389: The code loads bases asymmetrically: when base_override
is set it uses OmegaConf.load(base_path) (no inheritance expansion) but when
inferred it uses load_config(...) (fully expanded), and the shared
base_config_cache can return the wrong shape; change the explicit---base branch
to use the same expansion path as the inferred branch (call
load_config(str(base_path)) or otherwise expand defaults) before caching so
base_config_cache always stores a fully-resolved container; update references to
base_cfg_raw/base_resolved and keep using the same cache key (base_path) so
lookup behavior is consistent for both the base_override branch and the
_infer_base_from_defaults branch.

🧹 Nitpick comments (1)

tools/config_cli.py (1)

350-422: Significant code duplication between _minimize_one and _minimize_check_one.

Both helpers share nearly identical logic for: loading the child config, resolving the base (explicit vs. inferred), cache lookup/population, pruning, and reconstructing the defaults key. The main difference is that one writes/prints the result while the other compares it against the current file.

Consider extracting a shared helper (e.g., _resolve_and_prune(child_path, base_override, base_config_cache) -> tuple[dict, bool, Path]) that returns the pruned config, whether the base was inferred, and the base path. Both _minimize_one and _minimize_check_one would then only contain their divergent "emit vs. compare" logic.

Also applies to: 500-591