Add transformer implementation of relevance task

[Shreyanand]

This PR adds transformer implementation and distilbert base model for the relevance task. These notebooks will enable us to experiment with sparse models.

Reference Issues:
Closes #221
Addresses #184

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[suppathak]

Hi @Shreyanand ,
I am trying to run this notebook. I am encountering some minor bugs like "no module error" for sparsezoo, evaluate and datdaset. Is it possible to include them in the dependencies file? wdyt?

[Shreyanand]

Hi @Shreyanand , I am trying to run this notebook. I am encountering some minor bugs like "no module error" for sparsezoo, evaluate and datdaset. Is it possible to include them in the dependencies file? wdyt?

Good observation, I tried adding those to dependency files but some of them will cause an error with the farm notebooks as those notebooks rely on older versions of these packages. We need overlays for this problem but it'll take a while so for our experiments we'd have to pip install them for the time being.

[suppathak]

/lgtm

[Shreyanand]

/approve

[sesheta]

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