I’ve tried both. The article I linked Lei Mao's Log Book – Save, Load and Inference From TensorFlow 2.x Frozen Graph 7 describes this method. It resulted in “_UserObject has no attribute ‘inputs’” on the line
full_model = full_model.get_concrete_function(
tf.TensorSpec(model.inputs[0].shape, model.inputs[0].dtype))
My thought is that this script is for converting keras model, whereas the object detection model is possibly not keras. I’m not too sure