UnicodeDecodeError while loading pretrained model from AutoModel.from_pretrained()
Author: Jitukhamcha
Pull request: no

## Environment info
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- `transformers` version: 4.11.0.dev0
- Platform: Ubuntu/Linux
- Python version: 3.6.9
- PyTorch version (GPU?): 1.9.0
- Tensorflow version (GPU?): 2.6.0
- Using GPU in script?: No
- Using distributed or parallel set-up in script?: No

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## Information
I wanted to train a custom language model in devangari dataset. I trained the model using google-research  BERT repo using the scripts there.
![lang](https://user-images.githubusercontent.com/15711560/134165890-46627620-2fca-49d7-966d-81a3b9da398d.png)

This was the result after running run_pretraining,py
Then i used the huggingface script convert_bert_original_tf_checkpoint_to_pytorch.py to change the model to pytorch model. 
Pytorch Model was produced  using the script.
Then I used this script to load the model using huggingface TFAutomodel.
from transformers import AutoModel
from transformers import AutoTokenizer
save_directory = "/home/info/Documents/language_model_nlp/bert_language_model/language_model_pytorch/devanagari_language_model.bin"
tokenizer = AutoTokenizer.from_pretrained("/home/info/Documents/language_model_nlp/bert_language_model/devanagari_tokenizer")
model = AutoModel.from_pretrained(save_directory,from_pt=True)
I got error 
![errorr](https://user-images.githubusercontent.com/15711560/134166361-a0ae2774-0680-4bff-a227-d51608cffe0f.png)


Comments:
The path for the `AutoModel` should be to a directory pointing to a `pytorch_model.bin` and to a `config.json`. Since you're pointing to the `.bin` file directly, the configuration cannot be loaded.

> The path for the `AutoModel` should be to a directory pointing to a `pytorch_model.bin` and to a `config.json`. Since you're pointing to the `.bin` file directly, the configuration cannot be loaded.

I am giving the path of the model that I got when I ran this script convert_bert_original_tf_checkpoint_to_pytorch.py on the original model produced by training language model. I am confused which model file should I provide on AutoModel.from_pretrained() function.

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