Teknium
272 lines
12 KiB
Python
272 lines
12 KiB
Python
"""Wake-word hotword engines (openWakeWord / sherpa-onnx KWS / Porcupine).
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All three run fully on-device. Config, platform probes and sensitivity accessors
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live in :mod:`tools.wake_word`; engines read them lazily through that module (import cycle).
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"""
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from __future__ import annotations
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import logging
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import os
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from contextlib import suppress
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from pathlib import Path
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from typing import Any, Dict, Optional
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logger = logging.getLogger("tools.wake_word")
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def _ww():
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from tools import wake_word
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return wake_word
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def _ensure_dep(feature: str) -> None:
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from tools import lazy_deps
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lazy_deps.ensure(feature, prompt=False)
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class _Engine:
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"""Minimal hotword-engine contract: feed int16 frames, get a bool. Subclasses set ``feature``
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(lazy_deps name, ensured before ``_build``) and their own ``cfg`` sub-section ``section``."""
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feature: str = ""
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section: str = ""
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frame_length: int = 1280 # 80 ms at 16 kHz
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#: (matched phrase, profile name) of the most recent fire. Multi-phrase engines
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#: (sherpa) set this for profile routing; single-phrase engines leave it None.
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last_match: Optional[tuple[str, str]] = None
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def __init__(self, cfg: Dict[str, Any]):
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_ensure_dep(self.feature)
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self._build(cfg, _sub(cfg, self.section), _ww())
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def _build(self, cfg: Dict[str, Any], sub: Dict[str, Any], ww) -> None:
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raise NotImplementedError
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def process(self, frame) -> bool: # frame: 1-D int16 ndarray
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raise NotImplementedError
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def reset(self) -> None:
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"""Clear any internal audio/feature buffer (called on every (re)start)."""
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def close(self) -> None:
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"""Release engine resources (called once on stop)."""
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def _looks_like_path(value: str) -> bool:
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return os.sep in value or value.endswith((".onnx", ".tflite", ".ppn")) or os.path.exists(value)
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def _sub(cfg: Dict[str, Any], key: str) -> Dict[str, Any]:
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sub = cfg.get(key)
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return sub if isinstance(sub, dict) else {}
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class _OpenWakeWordEngine(_Engine):
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"""openWakeWord — free, local ONNX/tflite hotword detection. Scores one ~80 ms frame at a time;
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``sensitivity`` IS the raw 0..1 threshold (higher = stricter). A real utterance holds the score
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high across frames while a stray phoneme spikes one, so ``confirmation_frames`` hits are required."""
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feature, section = "wake.openwakeword", "openwakeword"
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frame_length = 1280 # openWakeWord recommends 80 ms frames.
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def _build(self, cfg, sub, ww) -> None:
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import openwakeword
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from openwakeword.model import Model
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model_ref = str(sub.get("model") or ww._BUNDLED_MODEL_NAME).strip()
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framework = self._usable_framework(ww.resolve_inference_framework(cfg))
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self._threshold = ww._sensitivity(cfg)
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self._confirm_needed = ww._confirmation_frames(cfg)
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self._confirm_streak = 0
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# Default (or explicit "hey_hermes") → the bundled model; built-in names / paths as-is.
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if model_ref.lower() in ww._BUNDLED_MODEL_ALIASES:
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model_ref = ww._bundled_wakeword_path(framework)
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# download_models() also fetches the shared feature models (melspectrogram +
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# embedding) needed for ANY model, so a custom path must call it too.
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try:
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openwakeword.utils.download_models([model_ref])
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except Exception as e: # pragma: no cover - network/path dependent
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logger.debug("openwakeword model download skipped: %s", e)
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self._model = Model(wakeword_models=[model_ref], inference_framework=framework)
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self._labels = list(self._model.models.keys())
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@staticmethod
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def _usable_framework(framework: str) -> str:
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"""Refuse openWakeWord's silent tflite→onnx downgrade: without a tflite runtime it falls back
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to onnx, which on macOS ARM64 never fires (armed but deaf). Install + bridge the runtime first
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(gate lives here because dep specs can't carry PEP 508 markers); on that Mac raise instead."""
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ww = _ww()
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if framework != "tflite" or ww.ensure_tflite_runtime():
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return framework
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try:
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_ensure_dep("wake.openwakeword.tflite")
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except Exception as e:
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logger.debug("wake word: tflite runtime install failed: %s", e)
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if ww.ensure_tflite_runtime():
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return framework
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if ww._is_macos_arm64():
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raise RuntimeError("The wake word needs the tflite backend on this Mac, but its "
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"runtime is missing. Install it with: pip install ai-edge-litert")
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logger.warning("wake word: no tflite runtime available — falling back to onnx")
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return "onnx"
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def process(self, frame) -> bool:
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hit = any(score >= self._threshold for score in self._model.predict(frame).values())
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self._confirm_streak = self._confirm_streak + 1 if hit else 0
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if self._confirm_streak < self._confirm_needed:
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return False
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self._confirm_streak = 0
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return True
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def reset(self) -> None:
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# Clears openWakeWord's rolling feature buffer so stale audio captured before a
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# pause can't re-fire the moment we resume.
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self._confirm_streak = 0
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with suppress(Exception):
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self._model.reset()
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def close(self) -> None:
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self.reset()
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# sherpa-onnx open-vocabulary KWS model: small streaming zipformer transducer (English,
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# GigaSpeech), downloaded once under HERMES_HOME. Keywords are tokenized at RUNTIME.
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_SHERPA_KWS_MODEL_URL = (
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"https://github.com/k2-fsa/sherpa-onnx/releases/download/kws-models/"
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"sherpa-onnx-kws-zipformer-gigaspeech-3.3M-2024-01-01.tar.bz2"
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)
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_SHERPA_KWS_MODEL_DIR = "sherpa-onnx-kws-zipformer-gigaspeech-3.3M-2024-01-01"
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def _sherpa_model_root() -> Path:
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from hermes_constants import get_hermes_home
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return get_hermes_home() / "cache" / "wakewords"
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def _ensure_sherpa_model(root: Optional[Path] = None) -> Path:
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"""Download + unpack the sherpa KWS model once; return its directory."""
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root = root or _sherpa_model_root()
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target = root / _SHERPA_KWS_MODEL_DIR
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if (target / "tokens.txt").exists():
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return target
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import tarfile
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import urllib.request
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root.mkdir(parents=True, exist_ok=True)
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archive = root / f"{_SHERPA_KWS_MODEL_DIR}.tar.bz2"
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logger.info("wake word: downloading sherpa KWS model (one-time, ~13 MB)")
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urllib.request.urlretrieve(_SHERPA_KWS_MODEL_URL, archive) # noqa: S310
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with tarfile.open(archive, "r:bz2") as tf:
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tf.extractall(root, filter="data")
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archive.unlink(missing_ok=True)
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if not (target / "tokens.txt").exists():
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raise RuntimeError(f"sherpa KWS model unpack failed: {target}")
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return target
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class _SherpaKwsEngine(_Engine):
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"""sherpa-onnx open-vocabulary keyword spotting — any typed phrase, zero training. ``wake_word.phrase``
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is BPE-tokenized at runtime against the model's vocabulary: DETECTION config, not a cosmetic label."""
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feature, section = "wake.sherpa", "sherpa"
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frame_length = 1280 # streaming zipformer accepts any chunk; match capture path.
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def _build(self, cfg, sub, ww) -> None:
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import sherpa_onnx
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import tempfile
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from sherpa_onnx import text2token
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model_dir = str(sub.get("model_dir") or "").strip()
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d = Path(model_dir) if model_dir else _ensure_sherpa_model()
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if not (d / "tokens.txt").exists():
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raise RuntimeError(f"sherpa KWS model not found at {d}")
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# Phrase set: this profile's phrase plus — with profile routing on — every other
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# wake-enabled profile's phrase, so ONE listener can wake any profile.
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phrase = str(ww._get(cfg, "phrase") or "hey hermes").strip()
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phrase_map: Dict[str, str] = {phrase: ww._active_profile_name()}
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if bool(cfg.get("profile_routing", True)):
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for prof, p in ww.enrolled_profile_phrases().items():
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phrase_map.setdefault(p.strip(), prof)
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phrases = list(phrase_map)
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tokens = text2token([p.upper() for p in phrases], tokens=str(d / "tokens.txt"), tokens_type="bpe",
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bpe_model=str(d / "bpe.model"))
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# sherpa keyword entries reject spaces in the @display-name; underscore them and
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# map display → profile for match routing.
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self._display_to_profile: Dict[str, str] = {}
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kw = tempfile.NamedTemporaryFile(mode="w", suffix=".txt", prefix="hermes-kws-", delete=False,
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encoding="utf-8")
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for p, toks in zip(phrases, tokens):
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display = p.upper().replace(" ", "_")
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self._display_to_profile[display] = phrase_map[p]
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kw.write(" ".join(toks) + f" @{display}\n")
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kw.close()
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self._keywords_file = kw.name
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# Shared 0..1 sensitivity → sherpa keywords_threshold. 0.5 lands on sherpa's
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# recommended 0.25; a stricter 0.35 missed ~12% of true positives in live TTS
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# matrix tests while 0.25 held zero false fires.
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threshold = 0.05 + 0.4 * ww._sensitivity(cfg)
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def _model_file(part: str) -> str:
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hits = sorted(d.glob(f"{part}-*[!8].onnx"))
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if not hits:
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raise RuntimeError(f"sherpa KWS model file missing: {d}/{part}-*[!8].onnx")
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return str(hits[0])
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self._spotter = sherpa_onnx.KeywordSpotter(
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tokens=str(d / "tokens.txt"), encoder=_model_file("encoder"), decoder=_model_file("decoder"),
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joiner=_model_file("joiner"), keywords_file=self._keywords_file, keywords_threshold=threshold,
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num_threads=1,
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)
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self._stream = self._spotter.create_stream()
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def process(self, frame) -> bool:
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import numpy as np
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self._stream.accept_waveform(_ww().SAMPLE_RATE, np.asarray(frame, dtype=np.float32) / 32768.0)
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fired = False
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while self._spotter.is_ready(self._stream):
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self._spotter.decode_stream(self._stream)
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result = self._spotter.get_result(self._stream)
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if result:
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fired, display = True, str(result)
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self.last_match = (display.replace("_", " ").lower(),
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self._display_to_profile.get(display, ""))
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self._spotter.reset_stream(self._stream) # one utterance must not fire repeatedly
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return fired
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def reset(self) -> None:
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# Fresh stream drops buffered audio/decoder state (pause → resume must not re-fire).
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with suppress(Exception):
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self._stream = self._spotter.create_stream()
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def close(self) -> None:
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with suppress(OSError):
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os.unlink(self._keywords_file)
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class _PorcupineEngine(_Engine):
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"""Picovoice Porcupine — premium, on-device, needs an access key."""
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feature, section = "wake.porcupine", "porcupine"
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def _build(self, cfg, sub, ww) -> None:
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import pvporcupine
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access_key = (os.getenv("PORCUPINE_ACCESS_KEY") or "").strip()
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if not access_key:
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raise RuntimeError("Porcupine wake word requires PORCUPINE_ACCESS_KEY "
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"(get a free key at https://console.picovoice.ai).")
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keyword = str(sub.get("keyword") or "jarvis").strip()
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# Porcupine's `sensitivities` runs the OPPOSITE way to our shared knob (higher =
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# looser); invert so "higher = stricter" holds for every engine.
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kwargs: Dict[str, Any] = {"access_key": access_key, "sensitivities": [1.0 - ww._sensitivity(cfg)]}
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kwargs["keyword_paths" if _looks_like_path(keyword) else "keywords"] = [keyword]
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self._porcupine = pvporcupine.create(**kwargs)
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self.frame_length = self._porcupine.frame_length
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def process(self, frame) -> bool:
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return self._porcupine.process(frame) >= 0 # pvporcupine wants a plain sequence of int16
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def close(self) -> None:
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with suppress(Exception):
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self._porcupine.delete()
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