what even are the backends

app.py

@@ -16,6 +16,9 @@ preferred_device = "cuda" if torch.cuda.is_available() else "cpu"
 preferred_dtype = torch.float16 if preferred_device == 'cuda' else torch.float32
 inpaint_preferred_device = "cuda" if torch.cuda.is_available() else ("mps" if torch.backends.mps.is_available() else "cpu")
 torch.backends.cuda.matmul.allow_tf32 = True
+
+print(f"backends: {torch._dynamo.list_backends()}")
+
 preferred_backend = "aot_eager" if inpaint_preferred_device == "mps" else ("torch_tensorrt" if inpaint_preferred_device == "cuda" else "inductor")
 
 seg_model_img_size = 768