PreTrainedEncoderDecoder on tensorflow
## 🚀 Feature

Hi, would it be possible to create a tensorflow version of `PreTrainedEncoderDecoder`?
## Motivation

The main motivation is that I would like to use `PreTrainedEncoderDecoder` in TensorFlow. Yeah, I got it, PyTorch is better and I totally agree but unfortunately, I have to use TensorFlow.

## Additional context

Looking at the code it does not seem too hard to create a `TFPreTrainedEncoderDecoder`

Thank you guys 
This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.
<|||||>We are still settling on the proper API for the pytorch version, so it will probably be awhile (months) before we make a tensorflow version. Feel free to take a stab at it, of course!<|||||>Thank you for the reply :) I guess I will use PyTorch then.
On 11 Feb 2020, 16:28 +0100, Sam Shleifer <notifications@github.com>, wrote:

We are still settling on the proper API for the pytorch version, so it will probably be awhile (months) before we make a tensorflow version. Feel free to take a stab at it, of course!

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