How can I export the trained model. The get_policy() method always returns None!

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I use the example of 3DBall in unity3d. I use get_policy().export_model() to export onnx but the get_policy() always returns None, and then I get “AttributeError: ‘NoneType’ object has no attribute ‘export_model’”. Any help would be appreciated.

What is the policy ID? get_policy() returns the policy under the default policy ID by default.
If this does not exist, it becomes None.