Fix KMP duplicate lib error on macOS for dependencies (PyTorch/FAISS)

backend/__init__.py

@@ -0,0 +1,8 @@
+import os
+import sys
+
+
+# The macOS wheels for PyTorch (used by Whisper) and FAISS bundle different
+# libomp copies. FAISS aborts the process when its copy initializes second.
+if sys.platform == "darwin":
+    os.environ.setdefault("KMP_DUPLICATE_LIB_OK", "TRUE")