title: TF2 how to remove custom signature of SavedModel and re-exporting the model
body: <p>I currently have a saved model, it is using a custom signature, but it needs to have serving_default signature def, so it should look like this: <code>signature_def['serving_default']</code>.</p>
  <p>If I do <code>saved_model_cli show</code> it currently shows</p>
  <pre><code>signature_def['image_quality']:
    The given SavedModel SignatureDef contains the following input(s):
      inputs['input_image'] tensor_info:
          dtype: DT_FLOAT
          shape: (-1, 224, 224, 3)
          name: input_1:0
    The given SavedModel SignatureDef contains the following output(s):
      outputs['quality_prediction'] tensor_info:
          dtype: DT_FLOAT
          shape: (-1, 10)
          name: dense_1/Softmax:0
    Method name is: tensorflow/serving/predict
  </code></pre>
  <p>Is there a way to remove the custom name and re-export the model in tensorflow 2 in order to have the serving_default signature?</p>