polyvoice

Speaker diarization for Python — who spoke when.

Rust-powered speaker diarization that runs on CPU, fits in ~8.4 MB INT8, and requires zero Python runtime overhead. The wheel still uses ONNX Runtime (the Rust CLI default since 0.18 is hand-written kernels). Pipeline v2 with VBx clustering and overlap detection.

Install

pip install polyvoice

Requires Python 3.9+.

Quick start

import polyvoice

# Models auto-download on first run (~8.4 MB INT8)
pipeline = polyvoice.Pipeline.balanced()

result = pipeline.run(samples, sample_rate=16000)

print(f"Speakers: {result['num_speakers']}")
for turn in result["turns"]:
    print(f"Speaker {turn['speaker']}: {turn['start']:.1f}s - {turn['end']:.1f}s")

API

polyvoice.Pipeline.balanced(models_cache=None, clusterer=None, vbx_plda_dir=None) — balanced accuracy / speed.
polyvoice.Pipeline.mobile(models_cache=None, clusterer=None, vbx_plda_dir=None) — smaller, faster model. clusterer is "vbx" (default, matching the CLI) or "ahc". VBx resolves its PLDA params via vbx_plda_dir, then the POLYVOICE_VBX_PLDA_DIR env var, then a registry download.
pipeline.run(samples, sample_rate) → dict with num_speakers and turns.
pipeline.run_result(samples, sample_rate) → typed DiarizationResult with .to_json() / .to_rttm() / .to_srt() / .to_vtt() / .to_txt() projections.
polyvoice.DiarizationResult.from_json(json) — re-hydrate a saved result.

Performance

Pipeline	VoxConverse-test DER (collar 0, overlap-scored)	Model size
default (v2+VBx, INT8)	15.2%	~8.4 MB

Full protocol, collar/averaging disclosure, and competitor numbers: docs/BENCHMARKS.md.

See the full repository for Rust / C / CLI APIs, benchmarks, and development docs.

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