Changed the input range for mobilenetV2

[rabinadk1]

Previously it was [0,1] but the input mobilenetV2 needs it in the form of [-1,1]. So made changes in the notebook to accommodate the change.

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Preview

Preview and run these notebook edits with Google Colab:

• site/en/tutorials/generative/adversarial_fgsm.ipynb

Diffs

For cleaner diffs (and easier review), format notebooks with the nbfmt.py tool:
./tools/nbfmt.py --ignore_warn path/to/notebook.ipynb
Rendered notebook diffs available on ReviewNB.com.

[rabinadk1]

@googlebot I signed it!

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[MarkDaoust]

Thanks!