Saving the model?

[FrancPS]

Is it possible to save the model? What library/function can we use to do so?

I have tried all the following, just after plotting the results, and all give me some kind of error...

    ... 
    # Plot resulting membership functions
        fis.plotmfs(sess)
        plt.show()

    #joblib.dump(fis, "./Models/anfisModel")
    #tf.keras.models.save_model(fis, "./Models/anfisModel")
    #fis.save("./Models/anfisModel")
    
    #import pickle
    #pickle.dump(fis, open("./Models/anfisModel", 'wb'))

    tf.saved_model.save(fis, "./Models/anfisModel")

The last one, for example, returns with the following error:

ValueError: Expected a Trackable object for export, got <anfis.ANFIS object at 0x7f592a99daf0>.

All the others return similar errors like "fis has no save atribute" and so on.
I guess it is because it is not a tensorflow object, but a custom one you create using tf?