Llama 2 Transfomers Neuron X issue
Author: liechtym
Pull request: no

I was trying to use the generate API for Llama 2 using the same code from this example:
https://awsdocs-neuron.readthedocs-hosted.com/en/latest/libraries/transformers-neuronx/transformers-neuronx-developer-guide.html#features

My code:
```
from transformers_neuronx.llama.model import LlamaForSampling
from transformers_neuronx.generation_utils import HuggingFaceGenerationModelAdapter

llama_model_cpu = LlamaForCausalLM.from_pretrained(
    'meta-llama/Llama-2-7b-chat-hf',
    torch_dtype=torch.float16,
)


llama_model_neuron = LlamaForSampling.from_pretrained('/home/ubuntu/Llama-2-7b-chat-hf-split', batch_size=1, tp_degree=2, amp='f16')
llama_model_neuron.to_neuron()
print('Config: ', llama_model_cpu.config)
llama_model = HuggingFaceGenerationModelAdapter(llama_model_cpu.config, llama_model_neuron)
```


Error:
```
Traceback (most recent call last):
  File "modular.py", line 107, in <module>
    chatbot = MiniGPT4LLama2Chatbot(cfg_path, gpu_id)
  File "modular.py", line 62, in __init__
    self.model = model_cls.from_config(model_config)
  File "/home/ubuntu/MiniGPT-4/minigpt4/models/minigpt4.py", line 173, in from_config
    model = cls(
  File "/home/ubuntu/MiniGPT-4/minigpt4/models/minigpt4.py", line 45, in __init__
    super().__init__(
  File "/home/ubuntu/MiniGPT-4/minigpt4/models/minigpt_base.py", line 43, in __init__
    self.llama_model, self.llama_tokenizer = self.init_llm(
  File "/home/ubuntu/MiniGPT-4/minigpt4/models/base_model.py", line 202, in init_llm
    llama_model = HuggingFaceGenerationModelAdapter(llama_model_cpu.config, llama_model_neuron)
  File "/opt/aws_neuron_venv_pytorch/lib/python3.8/site-packages/transformers_neuronx/generation_utils.py", line 18, in __init__
    super().__init__(config)
  File "/opt/aws_neuron_venv_pytorch/lib/python3.8/site-packages/transformers/modeling_utils.py", line 1190, in __init__
    config = self._autoset_attn_implementation(
  File "/opt/aws_neuron_venv_pytorch/lib/python3.8/site-packages/transformers/modeling_utils.py", line 1311, in _autoset_attn_implementation
    config = cls._check_and_enable_sdpa(
  File "/opt/aws_neuron_venv_pytorch/lib/python3.8/site-packages/transformers/modeling_utils.py", line 1464, in _check_and_enable_sdpa
    raise ValueError(
ValueError: HuggingFaceGenerationModelAdapter does not support an attention implementation through torch.nn.functional.scaled_dot_product_attention yet. Please open an issue on GitHub to request support for this architecture: https://github.com/huggingface/transformers/issues/new
```

Is there a work around for this? Or is supporting this attention implemention the only way? I simply want to use the generate api with a neuron-compiled model.

Comments:
Sorry I don't think this is related to `transformers` as there is a wrapper around it. `sdpa` is natively supported in transformers 

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