# Hugging Face Transformers v2.9.1 — Release & Upgrade Intelligence
- **Product:** Hugging Face Transformers (https://huggingface.co)
- **Version:** v2.9.1
- **Released:** May 14, 2020
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/transformers/updates/v2.9.1/

## Executive Summary (TL;DR)
Hugging Face Transformers v2.9.1. Source highlight: A new model architecture, `MarianMTModel` with 1,008+ pretrained weights is available for machine translation in PyTorch.

## New Features
- Multiple choice has been added to the TFTrainer (@ViktorAlm)
- Question Answering has been added to the TFTrainer (@jplu)

## Bug Fixes
- Fixed a bug with the tf generation pipeline (@patrickvonplaten)
- Fixed the XLA spawn (@julien-c)
- The sentiment analysis pipeline tokenizer was cased while the model was uncased (@mfuntowicz)
- Albert was added to the conversion CLI (@fgaim)
- CamemBERT's token ID generation from tokenizer were removed like RoBERTa, as the model does not use them (@LysandreJik)
- Additional migration documentation was added (@guoquan)

## Upgrade Command
```bash
python -m pip install 'transformers==2.9.1'
```