GPTNeoXForCausalLM examples fail to run
### System Info

```shell
- `transformers` version: 4.20.0.dev0
- Platform: Linux-5.13.0-44-generic-x86_64-with-glibc2.29
- Python version: 3.8.10
- Huggingface_hub version: 0.5.1
- PyTorch version (GPU?): 1.10.0+cu113 (True)
- Tensorflow version (GPU?): 2.6.0 (True)
- Flax version (CPU?/GPU?/TPU?): not installed (NA)
- Jax version: not installed
- JaxLib version: not installed
- Using GPU in script?: No
- Using distributed or parallel set-up in script?: No
```


### Who can help?

@patil-suraj

I have been trying to using Huggingface GPTNeoX models to generate text. However even the basic example use case fails both on `CPU` and `GPU`.

```
from transformers import GPTNeoXTokenizerFast, GPTNeoXForCausalLM, GPTNeoXConfig

if __name__ == "__main__":
    tokenizer = GPTNeoXTokenizerFast.from_pretrained("EleutherAI/gpt-neox-20b")
    config = GPTNeoXConfig.from_pretrained("EleutherAI/gpt-neox-20b")
    inputs = tokenizer("Hello, my dog is cute", return_tensors="pt")
    model = GPTNeoXForCausalLM.from_pretrained("EleutherAI/gpt-neox-20b", config=config)
    outputs = model.generate(
        inputs.input_ids,
        do_sample=True,
        temperature=0.9,
        max_length=100,
    )
    gen_text = tokenizer.batch_decode(outputs)[0]
    print(gen_text)

```

Fails with 

```
The attention mask and the pad token id were not set. As a consequence, you may observe unexpected behavior. Please pass your input's `attention_mask` to obtain reliable results.
Setting `pad_token_id` to `eos_token_id`:2 for open-end generation.
Traceback (most recent call last):
  File "/home/joy/.venv/lib/python3.8/site-packages/torch/autograd/grad_mode.py", line 28, in decorate_context
    return func(*args, **kwargs)
  File "/home/joy/.venv/lib/python3.8/site-packages/transformers/generation_utils.py", line 1320, in generate
    return self.sample(
  File "/home/joy/.venv/lib/python3.8/site-packages/transformers/generation_utils.py", line 1938, in sample
    outputs = self(
  File "/home/joy/.venv/lib/python3.8/site-packages/torch/nn/modules/module.py", line 1102, in _call_impl
    return forward_call(*input, **kwargs)
  File "/home/joy/.venv/lib/python3.8/site-packages/transformers/models/gpt_neox/modeling_gpt_neox.py", line 590, in forward
    outputs = self.gpt_neox(
  File "/home/joy/.venv/lib/python3.8/site-packages/torch/nn/modules/module.py", line 1102, in _call_impl
    return forward_call(*input, **kwargs)
  File "/home/joy/.venv/lib/python3.8/site-packages/transformers/models/gpt_neox/modeling_gpt_neox.py", line 482, in forward
    outputs = layer(
  File "/home/joy/.venv/lib/python3.8/site-packages/torch/nn/modules/module.py", line 1102, in _call_impl
    return forward_call(*input, **kwargs)
  File "/home/joy/.venv/lib/python3.8/site-packages/transformers/models/gpt_neox/modeling_gpt_neox.py", line 290, in forward
    attention_layer_outputs = self.attention(
  File "/home/joy/.venv/lib/python3.8/site-packages/torch/nn/modules/module.py", line 1102, in _call_impl
    return forward_call(*input, **kwargs)
  File "/home/joy/.venv/lib/python3.8/site-packages/transformers/models/gpt_neox/modeling_gpt_neox.py", line 148, in forward
    attn_output, attn_weights = self._attn(query, key, value, attention_mask, head_mask)
  File "/home/joy/.venv/lib/python3.8/site-packages/transformers/models/gpt_neox/modeling_gpt_neox.py", line 211, in _attn
    attn_output = torch.matmul(attn_weights, value)
RuntimeError: Expected batch2_sizes[0] == bs && batch2_sizes[1] == contraction_size to be true, but got false.  (Could this error message be improved?  If so, please report an enhancement request to PyTorch.)
```

Similar failure happen when running on CUDA as well. 

Based on -- https://huggingface.co/docs/transformers/main/en/model_doc/gpt_neox


### Information

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

### Tasks

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

### Reproduction

1. Run the example script in https://huggingface.co/docs/transformers/main/en/model_doc/gpt_neox
2. See failure both on CPU and GPU

### Expected behavior

```shell
The model should generate text.

On CUDA I have tried with `remove_invalid_values=True` but then the model produces garbage.
```

@zphang Would you be able to help us get this working? Thanks 🙏<|||||>I am using my own custom generate function and didn't have the invalid values problem, but I was also having issues with nonsensical generations that might possibly be related. I found that this was due to a mistake with caching the previous attention states on `line 146` of `modeling_gpt_neox.py`

I think `present = None if use_cache else (key, value)` should be `present = (key,value) if use_cache else None`

Changing that fixed my issue. You may also be able to set `use_cache=False` as an argument to `model.generate`, although that will give slightly slower generation.<|||||>Hi, sorry I've been busy. I should be able to take a look at this this weekend.<|||||>Thank you @benkrause and @zphang ! <|||||>Hi @benkrause  @zphang  I have same issue. Can you please help me to resolve it ?
```
The attention mask and the pad token id were not set. As a consequence, you may observe unexpected behavior. Please pass your input's `attention_mask` to obtain reliable results.
Setting `pad_token_id` to `eos_token_id`:2 for open-end generation.
Traceback (most recent call last):
  File "app.py", line 15, in <module>
    use_cache=False
  File "/opt/conda/lib/python3.7/site-packages/torch/autograd/grad_mode.py", line 28, in decorate_context
    return func(*args, **kwargs)
  File "/opt/conda/lib/python3.7/site-packages/transformers/generation_utils.py", line 1330, in generate
    **model_kwargs,
  File "/opt/conda/lib/python3.7/site-packages/transformers/generation_utils.py", line 1975, in sample
    next_tokens = torch.multinomial(probs, num_samples=1).squeeze(1)
RuntimeError: probability tensor contains either `inf`, `nan` or element < 0
```<|||||>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.<|||||>> Hi @benkrause @zphang I have same issue. Can you please help me to resolve it ?
> 
> ```
> The attention mask and the pad token id were not set. As a consequence, you may observe unexpected behavior. Please pass your input's `attention_mask` to obtain reliable results.
> Setting `pad_token_id` to `eos_token_id`:2 for open-end generation.
> Traceback (most recent call last):
>   File "app.py", line 15, in <module>
>     use_cache=False
>   File "/opt/conda/lib/python3.7/site-packages/torch/autograd/grad_mode.py", line 28, in decorate_context
>     return func(*args, **kwargs)
>   File "/opt/conda/lib/python3.7/site-packages/transformers/generation_utils.py", line 1330, in generate
>     **model_kwargs,
>   File "/opt/conda/lib/python3.7/site-packages/transformers/generation_utils.py", line 1975, in sample
>     next_tokens = torch.multinomial(probs, num_samples=1).squeeze(1)
> RuntimeError: probability tensor contains either `inf`, `nan` or element < 0
> ```



I'm also experiencing this issue. Have you already solved it?
