Update optimum_neuron_export.py

optimum_neuron_export.py

@@ -117,10 +117,10 @@ def get_default_inputs(task_or_pipeline: str) -> Dict[str, int]:
         return {"batch_size": 1, "sequence_length": 128}
 
 def prepare_compiler_flags(
-    auto_cast: str | None = None,
+    auto_cast: str = "matmul",
     auto_cast_type: str = "bf16",
     optlevel: str = "2",
-    instance_type: str = "trn1",
+    instance_type: str = "inf2",
 ):
     if auto_cast is not None:
         logger.info(f"Using Neuron: --auto-cast {auto_cast}")