Fix mnasnet_example notebook

[amrzv]

Hi.
This MR refreshes old tf1 syntax

AttributeError                            Traceback (most recent call last)
[/tmp/ipython-input-770025314.py](https://localhost:8080/#) in <cell line: 0>()
      5 filename = 'panda.jpg'
      6 display.display(display.Image(filename))
----> 7 img = np.array(PIL.Image.open(filename).resize((224, 224))).astype(np.float)

[/usr/local/lib/python3.12/dist-packages/numpy/__init__.py](https://localhost:8080/#) in __getattr__(attr)
    392 
    393         if attr in __former_attrs__:
--> 394             raise AttributeError(__former_attrs__[attr])
    395 
    396         if attr in __expired_attributes__:

AttributeError: module 'numpy' has no attribute 'float'.
`np.float` was a deprecated alias for the builtin `float`. To avoid this error in existing code, use `float` by itself. Doing this will not modify any behavior and is safe. If you specifically wanted the numpy scalar type, use `np.float64` here.
The aliases was originally deprecated in NumPy 1.20; for more details and guidance see the original release note at:
    https://numpy.org/devdocs/release/1.20.0-notes.html#deprecation

and

AttributeError                            Traceback (most recent call last)
[/tmp/ipython-input-1510045894.py](https://localhost:8080/#) in <cell line: 0>()
      4 checkpoint_name = 'mnasnet-a1'
      5 export_dir = os.path.join(checkpoint_name, 'saved_model')
----> 6 meta_graph_def = tf.saved_model.loader.load([tf.saved_model.tag_constants.SERVING], export_dir)

AttributeError: module 'tensorflow._api.v2.saved_model' has no attribute 'loader'

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