🔴 Live TV: NVIDIA NeMo/Gym/pull/

dcfarris · 2026-02-25T20:41:50Z

Summary

Adds XSTest safety benchmark (Rottger et al., NAACL 2024) as a new resource server
450 hand-crafted prompts (250 safe, 200 unsafe) that test whether models correctly comply with safe requests and refuse unsafe ones
Three verification modes: string-match (from the paper), LLM-as-judge (3-class taxonomy), and WildGuard (Allen AI safety classifier)
Judge mode is configurable via use_judge + judge_output_format — easily swappable between WildGuard, Qwen3-Guard, or any LLM judge
Includes WildGuard config (xstest_wildguard.yaml) with custom chat template for local_vllm_model

What's in this PR

app.py — resource server with string-match + LLM judge + WildGuard verdict parsing
configs/xstest.yaml — default config (string-match only)
configs/xstest_wildguard.yaml — WildGuard via local_vllm_model with custom chat template
prompt_templates/xstest_judge.txt — XSTest paper's 3-class judge prompt
prompt_templates/wildguard_judge.txt — WildGuard classifier prompt (verified identical to allenai/wildguard library)
data/example.jsonl — 5 example prompts (no system prompt)
tests/test_app.py — 31 tests (string-match, XSTest judge, WildGuard judge)
scripts/aggregate_results.py — per-category results aggregation

Validation

End-to-end tested with WildGuard judge on all 450 prompts
Results match internal baseline within expected temp=1.0 variance

Test plan

31 unit tests passing (pytest)
ruff check and ruff format clean
ng_prepare_data example validation passing
End-to-end rollout collection with ng_collect_rollouts
Full 450-prompt run with WildGuard judge via local_vllm_model
Aggregate reporting verified with per-category breakdown

copy-pr-bot · 2026-02-25T20:41:54Z

Auto-sync is disabled for draft pull requests in this repository. Workflows must be run manually.

Contributors can view more details about this message here.

Adds XSTest (Rottger et al., NAACL 2024) as a new resource server for evaluating LLM over-refusal behavior. 450 hand-crafted prompts (250 safe, 200 unsafe) test whether models correctly comply with safe requests and refuse unsafe ones. Two verification modes: - String-match classification (from the paper's 21 refusal prefixes) - LLM-as-judge with the paper's 3-class taxonomy (optional, configurable) Judge falls back to string matching on errors. Includes per-category aggregate reporting script and documentation. Signed-off-by: Dave Farris <dfarris@nvidia.com>

- Remove system prompt from dataset (XSTest tests raw prompt behavior) - Document recommended generation params (temp=1.0, max_output_tokens=32768) - Update README with no-system-prompt rationale and gen param guidance - Simplify _parse_judge_verdict (remove unnecessary variable) - Simplify test_sanity and aggregate_results.py Signed-off-by: Dave Farris <dfarris@nvidia.com>

Auto-generated by update-readme-table pre-commit hook. Signed-off-by: Dave Farris <dfarris@nvidia.com>

- Add judge_output_format config ("xstest" or "wildguard") to select parser - Add WildGuard verdict parser matching allenai/wildguard library output - Add WildGuard prompt template (inner content only, chat template in YAML) - Add xstest_wildguard.yaml config with local_vllm_model + custom chat template - WildGuard chat template verified to produce identical prompts to wildguard library - 31 tests (string-match, xstest judge, wildguard judge parsing + integration) Signed-off-by: Dave Farris <dfarris@nvidia.com>

prasoonvarshney

Added comments inline

…arsing, judge error tracking - Make WildGuard the default judge config (xstest.yaml), move string-match to xstest_string_match.yaml. - Fix _strip_thinking_blocks() to handle missing opening <think> tag (split on closing tag only, which is the reliable indicator). - Distinguish judge_parsing_error from judge_error in verdict labels for better debugging of unparseable judge output vs HTTP failures. - Log detected judge type (WildGuard/XSTest 3-class/string-match) in aggregate results output. - Add tests for thinking trace edge cases (no opening tag, orphaned opening tag, non-thinking model) and judge_parsing_error label. - Update README to document all three verification modes. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Signed-off-by: Dave Farris <dfarris@nvidia.com>

Per reviewer consensus, reasoning trace separation is the model server's responsibility (via --reasoning-parser for vLLM, or the Responses schema's native reasoning content type. The resource server no longer strips <think>/<thinking> blocks. Added a warning log if </think> tags are detected in response content, indicating the model server's reasoning parser may not be enabled. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> EOF ) Signed-off-by: Dave Farris <dfarris@nvidia.com>

prasoonvarshney

Thanks for the updates, LGTM

…s/add-xstest-benchmark Signed-off-by: Brian Yu <bxyu@nvidia.com>

- Add policy_model placeholder to xstest.yaml and xstest_string_match.yaml (required by config validation when agent references policy_model) - Add example_rollouts.jsonl (5 entries, required by new CI data validation) - Add example_metrics.json (required by CI data validation) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Signed-off-by: Dave Farris <dfarris@nvidia.com>

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Signed-off-by: Dave Farris <dfarris@nvidia.com>

## Summary - Adds XSTest safety benchmark (Rottger et al., NAACL 2024) as a new resource server - 450 hand-crafted prompts (250 safe, 200 unsafe) that test whether models correctly comply with safe requests and refuse unsafe ones - Three verification modes: string-match (from the paper), LLM-as-judge (3-class taxonomy), and WildGuard (Allen AI safety classifier) - Judge mode is configurable via `use_judge` + `judge_output_format` — easily swappable between WildGuard, Qwen3-Guard, or any LLM judge - Includes WildGuard config (`xstest_wildguard.yaml`) with custom chat template for `local_vllm_model` ## What's in this PR - `app.py` — resource server with string-match + LLM judge + WildGuard verdict parsing - `configs/xstest.yaml` — default config (string-match only) - `configs/xstest_wildguard.yaml` — WildGuard via `local_vllm_model` with custom chat template - `prompt_templates/xstest_judge.txt` — XSTest paper's 3-class judge prompt - `prompt_templates/wildguard_judge.txt` — WildGuard classifier prompt (verified identical to allenai/wildguard library) - `data/example.jsonl` — 5 example prompts (no system prompt) - `tests/test_app.py` — 31 tests (string-match, XSTest judge, WildGuard judge) - `scripts/aggregate_results.py` — per-category results aggregation ## Validation - End-to-end tested with WildGuard judge on all 450 prompts - Results match internal baseline within expected temp=1.0 variance ## Test plan - [x] 31 unit tests passing (`pytest`) - [x] `ruff check` and `ruff format` clean - [x] `ng_prepare_data` example validation passing - [x] End-to-end rollout collection with `ng_collect_rollouts` - [x] Full 450-prompt run with WildGuard judge via `local_vllm_model` - [x] Aggregate reporting verified with per-category breakdown --------- Signed-off-by: Dave Farris <dfarris@nvidia.com> Signed-off-by: Brian Yu <bxyu@nvidia.com> Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Co-authored-by: Brian Yu <bxyu@nvidia.com>

dcfarris added 3 commits March 4, 2026 15:33

chore: Add xstest to resource server README table

88b4cec

Auto-generated by update-readme-table pre-commit hook. Signed-off-by: Dave Farris <dfarris@nvidia.com>

dcfarris force-pushed the dfarris/add-xstest-benchmark branch from adf194f to 88b4cec Compare March 4, 2026 23:34

dcfarris marked this pull request as ready for review March 6, 2026 23:13

bxyu-nvidia previously approved these changes Mar 7, 2026

View reviewed changes