PyTorch Said SIGILL. My Raspberry Pi Said No. Local TTS on ARM Explained.

The author attempted to run LuxTTS, a PyTorch-based text-to-speech engine, locally on a Raspberry Pi but encountered a SIGILL (illegal instruction) crash. The issue stems from PyTorch's pre-built pip wheels being compiled with SIMD instructions (NEON/SVE) targeting modern ARM cores, which older Pi processors don't support. The theoretical fix is compiling PyTorch from source with matching CPU flags, but this is impractical on Pi hardware.