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(cherry picked from commit 566468cc984c6ec7e10dfc62b5b4191781a99cd2)

Co-authored-by: piero <piero@uber.com>
Co-authored-by: Rosanne Liu <mimosavvy@gmail.com>

Valohai integration

Mark tests in TFAutoModelTest as slow.

Each test forces downloading the same 536MB file, which is slow
even with a decent internet connection.

Mean does not exist in TF2

German DistilBERT

from_pretrained: convert DialoGPT format

Only init encoder_attention_mask if stack is decoder

Added Mish Activation Function

Fix CTRL past

Fix encode_plus

Add support for resumable downloads for HTTP protocol.