Initialize OPT 175B model for a long time
### System Info

Recently I am trying to train OPT 175B (facebook/opt-175b) and found my code needs almost 10 hours to initialize the model weights before starting training. Actually my code is pretty simple
```
...
config = PretrainedConfig.from_json_file('175b.json')
model = OPTForCausalLM(config)
...
```
Is there any issue of my code or I have to configure something to accelerate the initialization? @ArthurZucker , @younesbelkada 

### Who can help?

_No response_

### Information

- [ ] The official example scripts
- [X] My own modified scripts

### Tasks

- [ ] An officially supported task in the `examples` folder (such as GLUE/SQuAD, ...)
- [ ] My own task or dataset (give details below)

### Reproduction

I already posted the main part to cause the problem in problem description.

### Expected behavior

I think the initialization computation should not be so long.
The line takes a very long time because there are 176 billions parameters to initialize. The initialization is also performed several times, which is a bug we recently fixed. If you use the latest main you might see it takes a bit less time.<|||||>This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md) are likely to be ignored.