Fixing notebook and adding jupyter

[Shulk97]

Fixed various problems concerning notebooks from packages Feature Visualisation and Building Block such as code remaining in Python 2 or bugs occurring in the save and load functions of the package misc.io.
Adding of Jupyter versions of several notebooks that are meant to be used on the user's machine for his own model. It includes widgets in order to be easy to use.

[review-notebook-app]

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Review Jupyter notebook visual diffs & provide feedback on notebooks.

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[Shulk97]

The Jupyter notebooks are placed in a folder "jupyter_versions" in each package folder. Currently it is only the case for building-blocks (notebooks/building-blocks).

I forgot to list the other features of my PR :

• adding of a new notebook "SpritemapGenerator.ipynb" which allow the user to generate spritemaps for his own model. (placed in notebooks/building-blocks/jupyter_versions)
• adding of a module showing how to import a Keras model in Lucid (keras_model_import_example.py in lucid/recipes/)
• adding of a module showing how do define a custom model like the models from modelzoo (custom_model.py in lucid/misc/custom_model.py)
• adding of a new notebook "misc_objectives.ipynb" show further examples of objectives. (placed in notebooks/feature-visualization )

[ludwigschubert]

Hi @Shulk97 ! Wow, that's quite a PR; so sorry for ignoring it for so long! I'd still be happy to merge all of these, but since I'm about a year late, I'd need you to rebase on master first. Since your PR comes from a fork, I don't think I can do so for you.

Once you've rebased I hope tests should pass again, and then I'd be happy to merge. Thank you for your contributions! Once they're merged, we should think about how to signpost them to future users; e.g. I think we could add some of your sample notebooks to the public README if you're up for it?

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[Shulk97]

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[Shulk97]

Hello @ludwigschubert ! Thank you for your reply I would be happy to contribute to Lucid. The tests are passing again thanks to the rebase, however it seems that the consent of some authors of the rebased commits is missing. Could you see which consents are missing ?

If my pull request is accepted I could then propose an update of the README taking account of my contributions.

[ludwigschubert]

Hi @Shulk97 ! I've run into that issue before; I just wish the bot would point us to the offending commits! (It's likely just a stray email address.)

I'll take a look on Monday (it's EOD in my time zone already) and take it from here; thanks for updating!

PS: Agree that we should add them to the reader; if you already want to prepare: see if you want to make a thumbnail like we have done for the other notebooks? (But no pressure!)

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