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+# NSFW filter · Azure #164 · praxis v2
+
+Reset after the review comment on `docs/nsfw_praxis.md:1` (9 Jul). The v1
+protocol used classical art nudes as the borderline set. Wrong framing: art
+is not the target signal. This v2 rewrites the scope, the model shortlist,
+and the dataset plan before rerunning any bench.
+
+Date: 14 Jul 2026.
+
+## What we filter and why
+
+The service runs on every AI input and every AI output. Cost per request is
+the ceiling, not accuracy in isolation. It gates public content on the
+website, so a false negative is worse than a false positive on borderline.
+
+Target signals:
+
+- explicit sexual content (photorealistic or generated)
+- borderline nudity on real bodies (nude beach, topless photography), not
+  paintings
+- graphic violence, gore, weapons in threatening context
+- text prompts asking for any of the above (input side)
+
+Pass-through, not target:
+
+- artistic nudity (paintings, sculpture) unless graphic
+- medical, educational, ethnographic material
+- swimwear, lingerie catalog, dance, contact sport
+
+## Model shortlist
+
+Four candidates, two lanes (image and text). Numbers below are from HF
+model cards fetched 14 Jul, or from the v1 bench in the appendix.
+
+| Model | Params | Modality | Categories | License | Bench notes | Role |
+|---|---|---|---|---|---|---|
+| `bhky/opennsfw2` | Yahoo openNSFW2 port, few M | image | binary NSFW prob | MIT (bhky wrapper), upstream Yahoo terms to double-check before ship | 265 ms warm CPU M1 | fast image triage |
+| `Falconsai/nsfw_image_detection` | 85.8 M ViT | image | binary normal / nsfw, 98.04% eval acc | Apache 2.0 | 200 ms warm CPU M1 | accurate image |
+| `google/shieldgemma-2-4b-it` | 4 B | image + text | sexual explicit, dangerous, violence / gore, per-policy score | Gemma ToU | no CPU numbers, TPU-trained | policy-based, escalation only |
+| `google/shieldgemma-2b` | 2 B | text only | sexual explicit, dangerous, hate, harassment | Gemma ToU | no numbers | text prompt filter |
+
+Bhky and Falcon are the two image-side workhorses. ShieldGemma 4B is heavy
+(4 B params, no CPU latency disclosed) so it does not belong on the hot
+path. Useful when a caller asks for per-category output (nude vs violence
+vs weapon) that the two binary models cannot give. ShieldGemma 2B covers
+the text side, which the ticket did not scope originally but which the
+review comment on v1 pulled in as part of the same filter surface.
+
+## Cascade proposal
+
+Two lanes.
+
+```
+image path:
+  input --> bhky (prob)
+              prob < 0.2 --> pass
+              prob > 0.8 --> flag nsfw
+              0.2..0.8   --> Falconsai
+                              normal --> pass
+                              nsfw   --> flag
+              caller asked for per-category --> ShieldGemma-2-4B-IT
+                                                with per-policy prompt
+
+text path:
+  input --> ShieldGemma-2B, run 4 policies
+              any Yes --> block prompt
+              all No  --> pass
+```
+
+Bhky is cheap enough to run on every request. Falcon runs only on the
+uncertain band, keeps p99 controlled. ShieldGemma 4B runs only on explicit
+caller ask, never on the default path. ShieldGemma 2B is a separate text
+call, single roundtrip per prompt.
+
+Thresholds `0.2` and `0.8` are placeholders. Actual numbers come from the
+v2 bench in Tanda B, based on the ROC on the new dataset.
+
+## Test protocol v2
+
+Categories, 10 images each unless flagged. Text prompts are 20 strings.
+
+- `safe_real`: everyday photos, no ambiguity
+- `porn_explicit`: real explicit content (5 only, minimum to sanity check)
+- `borderline_nude_flag`: nude beach, topless real bodies, non-artistic
+- `borderline_safe_pass`: bikini, swimwear, lingerie catalog, contact sport
+- `violence_gore`: real injury, gore (5 only)
+- `weapons`: firearms and blades in threatening framing
+- `text_prompts`: 20 strings, half harmful (per the 4 ShieldGemma categories)
+  and half benign
+
+Image side scored on bhky + Falconsai + ShieldGemma-2-4B-IT.
+Text side scored on ShieldGemma-2B.
+
+For each image model, report: score, latency warm, latency cold, correct
+call at threshold 0.5. For ShieldGemma 4B, report per-policy score.
+
+## Sourcing plan (pending owner sign-off, blocks Tanda B)
+
+Sensitive material. This is the recommended plan, not started until
+signed off in the PR reply.
+
+Images and text:
+
+- Explicit and borderline nudity: `alex000kim/nsfw_data_scraper` on
+  GitHub. Five classes (`porn`, `hentai`, `sexy`, `neutral`, `drawings`),
+  URL lists checked into the repo, run the download script to pull actual
+  images to disk. Cited baseline in most NSFW detector papers. Author
+  flag: dataset is noisy, so sample by hand into the v2 categories
+  (`porn_explicit` from `porn`, `borderline_nude_flag` from the nude end
+  of `sexy`, `borderline_safe_pass` from the bikini end of `sexy` plus
+  neutral stock).
+- Violence and gore: `RealLifeViolenceDataset` on Kaggle. 2000 videos,
+  1000 violence 1000 non-violence, extract frames.
+- Weapons: sample from a Kaggle weapon-detection dataset (firearms,
+  blades). Concrete name confirmed at build time.
+- Safe real photos: Unsplash / Pexels API with adult flag off.
+- Text prompts: author in repo, 10 harmful and 10 benign, cross the four
+  ShieldGemma text categories.
+
+Not on the table: LAION-NSFW (Stanford CSAM report Dec 2023, LAION
+guidance is research-only, not production), NudeNet training set
+(detector is public, training data is not).
+
+Runs on the laptop, no cloud runner needed for the image side. Cache goes
+in a repo-ignored path.
+
+## Blockers before rerun
+
+- Sign-off on the sourcing plan above (question in the PR#20 reply).
+- Gemma ToU accepted on HF for the account that pulls ShieldGemma.
+- Confirm whether ShieldGemma 4B runs on M1 with int8 quant or needs a
+  cloud runner (Modal / RunPod).
+
+## Frictions for the APIPod integration prompt
+
+1. `tmplink/nsfw_detector` still 404 on HF. Substitute Falconsai
+   (Apache 2.0, verified 14 Jul).
+2. TF / torch wheels for Python 3.14 do not exist yet. Worker image pins
+   3.11 or 3.12.
+3. `opennsfw2` first predict downloads weights to `~/.opennsfw2/`. Worker
+   needs a persistent cache mount or the download runs on every cold start.
+4. ShieldGemma pulls from HF gated repos. Worker HF token needs Gemma ToU
+   accepted per account.
+5. Model registration syntax changed on APIPod `origin/new_registry` branch
+   (refactor 16 Jun). Port target is that branch, not `dev`.
+
+## Open questions
+
+1. Response schema. Ship one canonical `nsfw_score` binary, or expose the
+   3 ShieldGemma categories granularly to the caller when they ask?
+2. Text lane scope. Is ShieldGemma 2B in this ticket, or split into a
+   sibling ticket? Different model family, different endpoint shape.
+
+## Appendix · v1 baseline (9 Jul)
+
+Kept as sanity check that the two image models return low scores on
+synthetic safe content and that both can fire on art nudes. Wrong dataset
+for the actual filter decision, right dataset to prove the plumbing works.
+
+### bhky on 5 safe PIL images
+
+| Image | NSFW prob | Latency (ms) | Note |
+|---|---|---|---|
+| 1_plain_green.jpg | 0.0003 | 2114.7 | cold |
+| 2_circle_bw.jpg | 0.0119 | 242.2 | warm |
+| 3_text_gradient.jpg | 0.0113 | 276.9 | warm |
+| 4_checker.jpg | 0.0033 | 274.9 | warm |
+| 5_landscape.jpg | 0.0000 | 267.2 | warm |
+
+Cold start 2.1 s, warm mean 265 ms.
+
+### Falconsai on 5 safe PIL images
+
+| Image | Label | Score | Latency (ms) | Note |
+|---|---|---|---|---|
+| 1_plain_green.jpg | normal | 0.9992 | 2106.6 | cold |
+| 2_circle_bw.jpg | normal | 0.9986 | 215.7 | warm |
+| 3_text_gradient.jpg | normal | 0.9986 | 179.5 | warm |
+| 4_checker.jpg | normal | 0.9967 | 204.0 | warm |
+| 5_landscape.jpg | normal | 0.9995 | 191.8 | warm |
+
+Cold start 2.1 s, warm mean 198 ms.
+
+### bhky on 5 art nudes (wrong dataset, kept for the record)
+
+| Image | NSFW prob | Verdict at 0.5 |
+|---|---|---|
+| 1_botticelli_venus.jpg | 0.0626 | safe |
+| 2_michelangelo_david.jpg | 0.8723 | flag |
+| 3_titian_venus_urbino.jpg | 0.9829 | flag |
+| 4_rubens_three_graces.jpg | 0.9371 | flag |
+| 5_doryphoros_statue.jpg | 0.4060 | safe |
+
+### Falconsai on 5 art nudes (wrong dataset, kept for the record)
+
+| Image | Label | Score |
+|---|---|---|
+| 1_botticelli_venus.jpg | normal | 0.9984 |
+| 2_michelangelo_david.jpg | normal | 0.9997 |
+| 3_titian_venus_urbino.jpg | nsfw | 0.6666 |
+| 4_rubens_three_graces.jpg | nsfw | 0.9997 |
+| 5_doryphoros_statue.jpg | normal | 0.9998 |