add roberta support#1503

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BunnyNoBugs wants to merge 5 commits intodeeppavlov:devfrom

BunnyNoBugs:refactor/torch_squad

Commits on Nov 11, 2021

add roberta support
BunnyNoBugs
committed

Commits on Nov 19, 2021

Commits on Nov 25, 2021

add other models support for training
BunnyNoBugs
committed