Pysyft: Add Word-level language modeling RNN Wikitext-2 Example

[madhavajay]

Description

Add two notebook's which reflect the Wikitext example split into DO (Data Owner) and DS (Data Scientist):
https://github.com/pytorch/examples/tree/master/word_language_model

Subclasses of module.nn and custom corpus and dictionary code will likely need to be on the DO (Data Owner) side.

Definition of Done

The partially runnable Wikitext notebook should be in the examples/pytorch/wikitext folder and a README.md should be added in the parent examples/pytorch directory with a link to the original example and our notebook.

[DanyEle]

Would be very interesting to have in PySyft indeed

[gmuraru]

Heads-up - this is for pysyft0.3.0 version

[AlanAboudib]

@madhavajay Anyone is working on this currently?
I see it has a critical status, should it be completed before November 11th?

[AlanAboudib]

@madhavajay I am taking this one

[github-actions[bot]]

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[ydennisy]

hey @AlanAboudib do you have an ETA planned for this?

[madhavajay]

@ydennisy there are some other blockers preventing @AlanAboudib from finishing this notebook. As soon as they are resolved we will get this notebook merged.