backup: 2026-10-05 09:48
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** Architecture
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Simlish-style procedural speech synthesizer for trmn. Output: ONNX model loaded by JS in trmn.
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Pipeline: text → prosody (JS) → phoneme sequence → ONNX flow matching → mel → Griffin-Lim → audio.
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Deterministic: seeded per character via trmn's masterSeed PRNG.
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See [[just-talking/simlish-project]] for full scoping notes and research version design.
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Two-stage inference:
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1. Acoustic model (flow matching, ONNX): (phone_ids, durations, pitch, energy, emotion) → mel[80×T]
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2. Vocoder (Griffin-Lim, pure JS): mel → waveform. No weights. Swappable later.
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** Decided: Acoustic Model
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Adapted Matcha-TTS (ICASSP 2024, arXiv:2309.03199). ConvNeXt-based OT-CFM flow decoder.
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- Phoneme encoder: embedding table (N_PHONEMES=16) + 2 Conv1d layers → hidden[128, P]
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- Duration predictor: DROPPED — durations come from prosody.mjs at inference time
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- Length regulator: kept — repeat_interleave phoneme hidden states by duration counts
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- Flow decoder: 5 ConvNeXt blocks, 128 channels. FiLM emotion conditioning per block.
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- Pitch + energy: linear-embedded per frame, concatenated with phoneme hidden before decoder
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- ~2–5M params. Trained with OT-CFM (MSE on predicted velocity x1-x0).
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** Decided: Phoneme Inventory (16 total)
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0=<pad> 1=<sil>
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2=p 3=t 4=k 5=b 6=d 7=m 8=n 9=s 10=l
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11=a 12=e 13=i 14=o 15=u
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No <bos>/<eos> — not needed for non-autoregressive model.
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** Decided: Training Data — LUT Approach
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English words → letter LUT → mapped text → Piper TTS → audio → mel extraction.
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LUT: letters in inventory map to themselves; others map to nearest class (r→l, f→s, g→d, etc.)
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Phone IDs come from re-applying LUT at extract time — no forced alignment.
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Duration heuristic: vowels get 1.5× frames, silences 0.4×, consonants 1.0×, proportional to total T.
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Length-scale varied 0.8–1.3× per sample for duration variety.
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Piper voice: en_US-lessac-medium (fetched via Nix, both .onnx and .onnx.json pinned by sha256).
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~10–50h synthetic audio expected to suffice.
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** Decided: Nix Targets
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Separate derivations with strict dep isolation (mirrors trmn pattern):
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packages.onnx-model — ONNX artifact trmn pulls in; placeholder until checkpoint pinned
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packages.piper-voice — fetchurl'd lessac-medium model + config, cached independently
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apps.gen-data — Piper + librosa + numpy; no torch, no JS
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apps.train — torchWithCuda + onnx; no Piper, no MFA, no JS
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apps.test — nodejs only; no Python
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devShells.data — same deps as gen-data, PIPER_MODEL/PIPER_CONFIG set via env
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devShells.training — torchWithCuda + onnx; for LAN laptop (RTX 3050)
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devShells.default — nixfmt + nodejs; lightweight
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** Decided: Training Environment
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LAN laptop: aner@192.168.1.200, no password. WSL2 on Windows. RTX 3050 6GB VRAM, CUDA 13.2.
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CUDA accessible via /dev/dxg (WSL2 WDDM). nvidia-smi at /usr/lib/wsl/lib/nvidia-smi.
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Disk: 899GB available (plenty). RAM: 7.6GB WSL2 limit — may need to raise via C:\Users\<you>\.wslconfig.
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PyTorch: use torchWithCuda (not torch) in Nix — default torch is CPU-only.
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** Key Files
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- flake.nix — all Nix targets; Piper voice fetched here
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- data/gen_corpus.py — English words → LUT → .txt (Piper input) + .ids (phone IDs)
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- data/synthesize.py — Piper TTS → .wav per sentence (length-scale varied)
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- data/extract.py — audio + .ids → mel/pitch/energy/durs → .npz dataset
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- model/acoustic.py — AcousticModel: PhonemeEncoder + LengthRegulator + FlowDecoder
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- model/train.py — OT-CFM training loop
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- model/export.py — PyTorch checkpoint → ONNX FP32 → INT8
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- inference/prosody.mjs — text + emotion → phone_ids/durations/pitch/energy (pure JS)
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- inference/griffin_lim.mjs — mel → waveform (pure JS, replaceable vocoder)
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- test/infer.test.mjs — ONNX load + forward pass + shape checks (node:test)
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- test/prosody.test.mjs — prosody extraction unit tests: determinism, emotion, shapes
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** Conventions
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- No runtime server calls at inference
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- Same seed must always produce same voice (deterministic)
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- Vocoder is a swappable box: mel[80×T] in, waveform out
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- Nix: no npm/pip lock files — Nix is the build orchestrator
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- Only git-tracked files included in builds (src = ./. in derivations)
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- node:test for JS tests (no framework, follows trmn no-bundler pattern)
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- Piper CLI: echo "text" | piper -m model.onnx -c config.json -f out.wav
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** Gotchas
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- trmn is static Nix-packaged — ONNX artifact must be added to trmn's flake.nix (not this one)
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- SVG mouth sprites in trmn are ready to animate but animation API not yet defined
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- ODE integration loop (Euler, N steps) runs in JS — only single-step velocity exported to ONNX
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- extract.py reads .ids files from corpus/ subdir, audio from audio/ subdir — path is hardcoded relative
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- dataPython defined twice in flake.nix (packages and apps sections) — intentional, avoids cross-section ref
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- torchWithCuda (not torch) required in Nix for GPU training — default torch is CPU-only
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- WSL2: nvidia-smi not on PATH, use /usr/lib/wsl/lib/nvidia-smi; CUDA works via /dev/dxg
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** Subnodes
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(none yet)
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