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Add Edge TPU subprocess probe to safely detect segfaults

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Probes the Edge TPU in a subprocess before loading — catches segfaults
(libedgetpu ABI mismatch on Debian Trixie/Python 3.13) and falls back
to CPU automatically. No more service crashes on Coral incompatibility.

When the runtime is eventually fixed, Edge TPU will be used automatically
with no config changes needed.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Alex
2026-04-11 17:40:03 -05:00
parent 43f40bf48c
commit 05409403e9
2 changed files with 40 additions and 10 deletions
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headmic.py
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@@ -469,8 +469,8 @@ async def startup():
edgetpu_model_path = model_dir / "yamnet_edgetpu.tflite"
model_path = model_dir / "yamnet.tflite"
class_map_path = model_dir / "yamnet_class_map.csv"
# Edge TPU opt-in via env var (segfaults with some libedgetpu versions)
use_edgetpu = os.environ.get("USE_EDGETPU", "").lower() in ("1", "true", "yes") and edgetpu_model_path.exists()
# Auto-detect Edge TPU — probe in subprocess catches segfaults safely
use_edgetpu = edgetpu_model_path.exists()
active_model = edgetpu_model_path if use_edgetpu else model_path
if active_model.exists() and class_map_path.exists():
try: