Import error for MarianMTModel
Author: brian-o-mars
Pull request: no
Labels: name: wontfix

## Environment info
<!-- You can run the command `transformers-cli env` and copy-and-paste its output below.
     Don't forget to fill out the missing fields in that output! -->
     
- `transformers` version:
- Platform:
- Python version:
- PyTorch version (GPU?):
- Tensorflow version (GPU?):
- Using GPU in script?:
- Using distributed or parallel set-up in script?:

### Who can help
<!-- Your issue will be replied to more quickly if you can figure out the right person to tag with @
 If you know how to use git blame, that is the easiest way, otherwise, here is a rough guide of **who to tag**.
 Please tag fewer than 3 people.
 
 albert, bert, GPT2, XLM: @LysandreJik 
 tokenizers: @mfuntowicz
 Trainer: @sgugger
 Speed and Memory Benchmarks: @patrickvonplaten
 Model Cards: @julien-c
 Translation: @sshleifer
 Summarization: @sshleifer
 TextGeneration: @TevenLeScao 
 examples/distillation: @VictorSanh
 nlp datasets: [different repo](https://github.com/huggingface/nlp)
 rust tokenizers: [different repo](https://github.com/huggingface/tokenizers)
 Text Generation: @TevenLeScao
 blenderbot: @mariamabarham
 Bart: @sshleifer
 Marian: @sshleifer
 T5: @patrickvonplaten
 Longformer/Reformer: @patrickvonplaten
 TransfoXL/XLNet: @TevenLeScao 
 examples/seq2seq: @sshleifer
 examples/bert-loses-patience: @JetRunner
 tensorflow: @jplu
 examples/token-classification: @stefan-it
 documentation: @sgugger
 -->

## Information

Model I am using (Bert, XLNet ...): MarianMTModel

The problem arises when using:
* [ ] the official example scripts: (give details below)
* [ ] my own modified scripts: (give details below)
I tried importing MarianMTmodel from transformers and it raised an error message

The tasks I am working on is:
* [ ] an official GLUE/SQUaD task: (give the name)
* [ ] my own task or dataset: (give details below)
My own task

## To reproduce

Steps to reproduce the behavior:

1.from transformers import MarianMTModel, MarianTokenizer
2.
3.

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## Expected behavior
Imports MarianMTModel correctly
<!-- A clear and concise description of what you would expect to happen. -->

This is the error message I got:
ImportError: cannot import name 'MarianMTModel' from 'transformers' (C:\Users\PRINCE\Anaconda3\envs\Brian's Enviroment\lib\site-packages\transformers\__init__.py)


Comments:
Hi, please fill-in the template or we won't be able to help you.

Hello, I have updated it. Thanks

This part is the most important part, please complete it:


> ```
> transformers version:
> Platform:
> Python version:
> PyTorch version (GPU?):
> Tensorflow version (GPU?):
> Using GPU in script?:
> Using distributed or parallel set-up in script?:
> ```

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