feat(pockettts): opt-in 24-layer checkpoints via OMNIVOICE_POCKETTTS_24L - #1613
Conversation
pocket-tts ships two checkpoints per language: the default 6-layer model and a 24-layer variant (italian_24l, german_24l, ...). The 24-layer gives clearly better prosody at ~2x render time (RTF 0.32x → 0.68x on an M3 Pro, still faster than real-time). When OMNIVOICE_POCKETTTS_24L is truthy and the installed pocket-tts has a 24-layer config for the requested language, the sidecar loads that checkpoint; otherwise (and by default) nothing changes. The availability check reads pocket-tts' own configs dir, so languages without a 24-layer variant (english) are untouched.
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| Filename | Overview |
|---|---|
| backend/engines/pockettts/main.py | Adds checkpoint-name resolution and applies it on PocketTTS model cache misses. |
| tests/test_pockettts_sidecar.py | Covers environment parsing, checkpoint availability fallback, loader forwarding, and unconditional French mapping. |
| docs/engines/pockettts.md | Documents the 24-layer opt-in, performance tradeoff, and French checkpoint behavior. |
| CHANGELOG.md | Records the opt-in checkpoint support and restoration of French synthesis. |
Reviews (7): Last reviewed commit: "Merge main into feat/pockettts-24l-optin..." | Re-trigger Greptile
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Included review availability: Your plan provides up to 10 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughChangesPocketTTS 24-layer selection
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The opt-in checkpoint change preserves the default 6-layer behavior, and no actionable merge-blocking risk remains beyond normal checks and review. Suggested reviewers: 🚥 Pre-merge checks | ✅ 7 | ❌ 2❌ Failed checks (2 warnings)
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Inline comments:
In `@backend/engines/pockettts/main.py`:
- Around line 174-176: Update the language selector in the PocketTTS function
around _has_24l_config so French always returns french_24l, regardless of
OMNIVOICE_POCKETTTS_24L or configuration availability. Add an unset-environment
regression test in tests/test_pockettts_sidecar.py covering French selection,
and document this behavior in docs/engines/pockettts.md.
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Review follow-up (CodeRabbit on debpalash#1613): pocket-tts 2.1.0 raises on load_model(language='french') ('only a larger 24-layer model is available for French'), so the fr mapping was broken on the default path, independent of the new env var. French now always resolves to french_24l; the env opt-in governs the other five languages as before.
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Good catch on French — confirmed against the 2.1.0 source ( |
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Good catch on French — confirmed against the 2.1.0 source ( |
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Reviewed — the knob itself is clean (availability read from pocket-tts' own configs dir, opt-in, no default change, and the RTF honesty in the PR body is appreciated). One blocking item, and it's bigger than the knob: The French change is a bug fix, and it's buried. That deserves to be visible rather than a parenthetical inside a performance knob:
Two smaller things:
Once the changelog and the docs line are in, this is good to go from my side. |
Owner review on debpalash#1613: surface the French fix (### Fixed) and the 24L knob (### Added) in the changelog; note in the engine docs that French always renders through the 24-layer checkpoint so its speed is the 24-layer figure; log when the 24l config probe fails so the knob can't go silently inert; pin the French mapping as independent of the probe.
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Inline comments:
In `@tests/test_pockettts_sidecar.py`:
- Around line 473-477: Update the French model-name test around
_model_config_name to cover both an unset OMNIVOICE_POCKETTTS_24L value and a
value of "1", while replacing the _has_24l_config monkeypatch with a probe that
raises if called. Assert that _model_config_name("french") always returns
"french_24l" in both environment states.
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… probes CodeRabbit on debpalash#1613: the test removed the env var and stubbed the probe with booleans, so a regression gating French on a truthy env value — or one that still consulted the probe — passed. French now asserts identical resolution with the var unset, falsy, and truthy, against a probe that raises if called.
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What
pocket-tts ships two checkpoints per language: the default 6-layer model and a 24-layer variant (
italian_24l,german_24l,spanish_24l,portuguese_24l,french_24l; english has none). This adds an opt-in env knob for deployments that want to trade some of PocketTTS's speed for quality: whenOMNIVOICE_POCKETTTS_24Lis truthy and the installed pocket-tts ships a 24-layer config for the requested language, the sidecar loads that checkpoint. The availability check reads pocket-tts' own configs directory, so engines without a 24-layer variant fall through unchanged.To be explicit about positioning: the 6-layer default remains the recommended configuration. PocketTTS's reason to exist in VoiceStudio is its latency on CPU; the 24-layer model roughly doubles render time (measured RTF 0.32x → 0.68x on an M3 Pro — still faster than real-time, but half the headroom). This knob exists for the niche deployment that prefers the extra prosody and can afford the RTF, not as a suggested upgrade.
Notes
Testing
tests/test_pockettts_sidecar.py: off-by-default, suffix selection only where a config exists, truthy spellings, and the load path passing the suffixed name toTTSModel.load_model. Full file: 53 passed.italian_24l; without it, viaitalian.Docs
docs/engines/pockettts.mdvariables table gains the new knob (docs-sync).PocketTTS now supports opt-in 24-layer checkpoints through
OMNIVOICE_POCKETTTS_24L, while French always usesfrench_24lbecause no 6-layer French model exists. This improves prosody for deployments that accept roughly twice the render time and preserves the 6-layer default for other languages. Configuration-probe failures now log instead of being silently ignored, and tests cover fallback, environment handling, checkpoint loading, and French selection.