Accelerate integration with Transformer Engine crashes when using FlashAttention

### System Info

```Shell
Accelerate: 0.24.1
OS: Ubuntu 22.04
Python: 3.10
NumPy: 1.26.0
Torch: 2.1.0

Accelerate configuration:

compute_environment: LOCAL_MACHINE
debug: false
deepspeed_config:
gradient_accumulation_steps: 4
gradient_clipping: 1.0
offload_optimizer_device: none
offload_param_device: none
zero3_init_flag: true
zero3_save_16bit_model: false
zero_stage: 3
distributed_type: DEEPSPEED
downcast_bf16: 'no'
machine_rank: 0
main_training_function: main
mixed_precision: fp8
num_machines: 1
num_processes: 2
rdzv_backend: static
same_network: true
tpu_env: []
tpu_use_cluster: false
tpu_use_sudo: false
use_cpu: false
```

### Information

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

### Tasks

- [X] One of the scripts in the examples/ folder of Accelerate or an officially supported `no_trainer` script in the `examples` folder of the `transformers` repo (such as `run_no_trainer_glue.py`)
- [ ] My own task or dataset (give details below)

### Reproduction

Run the `run_clm_no_trainer.py` script with the provided config on a model that supports Flash Attention, and turn Flash Attention on with the flag `use_flash_attention_2=True`:

model = AutoModelForCausalLM.from_pretrained(
args.model_name_or_path,
from_tf=bool(".ckpt" in args.model_name_or_path),
config=config,
torch_dtype=torch.bfloat16,
trust_remote_code=args.trust_remote_code,
use_flash_attention_2=True
)

Eg. here is a call I used:

`accelerate launch run_clm_no_trainer.py --train_file blog_train.json --validation_file blog_val.json --model_name_or_path facebook/opt-1.3b --per_device_train_batch_size 12 --per_device_eval_batch_size 12 --learning_rate 1e-5 --num_train_epochs 1 --gradient_accumulation_steps 4 --output_dir blog_opt --block_size 1024 --checkpointing_steps 400000 --trust_remote_code true --report_to wandb --eval_steps 100 --with_tracking`

### Expected behavior

Training should run. Instead, it crashes with this error:

Traceback (most recent call last):
File "/home/alyssa/lm_fun/run_clm.py", line 769, in
main()
File "/home/alyssa/lm_fun/run_clm.py", line 675, in main
outputs = model(**batch)
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1518, in _wrapped_call_impl
return self._call_impl(*args, **kwargs)
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1527, in _call_impl
return forward_call(*args, **kwargs)
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/deepspeed/utils/nvtx.py", line 15, in wrapped_fn
ret_val = func(*args, **kwargs)
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/deepspeed/runtime/engine.py", line 1818, in forward
loss = self.module(*inputs, **kwargs)
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1518, in _wrapped_call_impl
return self._call_impl(*args, **kwargs)
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1568, in _call_impl
result = forward_call(*args, **kwargs)
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/transformers/models/opt/modeling_opt.py", line 1129, in forward
outputs = self.model.decoder(
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1518, in _wrapped_call_impl
return self._call_impl(*args, **kwargs)
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1568, in _call_impl
result = forward_call(*args, **kwargs)
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/transformers/models/opt/modeling_opt.py", line 885, in forward
layer_outputs = self._gradient_checkpointing_func(
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/torch/_compile.py", line 24, in inner
return torch._dynamo.disable(fn, recursive)(*args, **kwargs)
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/torch/_dynamo/eval_frame.py", line 328, in _fn
return fn(*args, **kwargs)
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/torch/_dynamo/external_utils.py", line 17, in inner
return fn(*args, **kwargs)
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/torch/utils/checkpoint.py", line 451, in checkpoint
return CheckpointFunction.apply(function, preserve, *args)
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/torch/autograd/function.py", line 539, in apply
return super().apply(*args, **kwargs) # type: ignore[misc]
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/torch/utils/checkpoint.py", line 230, in forward
outputs = run_function(*args)
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1518, in _wrapped_call_impl
return self._call_impl(*args, **kwargs)
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1568, in _call_impl
result = forward_call(*args, **kwargs)
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/transformers/models/opt/modeling_opt.py", line 536, in forward
hidden_states, self_attn_weights, present_key_value = self.self_attn(
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1518, in _wrapped_call_impl
return self._call_impl(*args, **kwargs)
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1568, in _call_impl
result = forward_call(*args, **kwargs)
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/transformers/models/opt/modeling_opt.py", line 371, in forward
attn_output = self._flash_attention_forward(
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/transformers/models/opt/modeling_opt.py", line 416, in _flash_attention_forward
attn_output_unpad = flash_attn_varlen_func(
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/flash_attn/flash_attn_interface.py", line 906, in flash_attn_varlen_func
return FlashAttnVarlenFunc.apply(
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/torch/autograd/function.py", line 539, in apply
return super().apply(*args, **kwargs) # type: ignore[misc]
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/flash_attn/flash_attn_interface.py", line 496, in forward
out, q, k, v, out_padded, softmax_lse, S_dmask, rng_state = _flash_attn_varlen_forward(
File "/home/alyssa/anaconda3/envs/lm_fun/lib/python3.10/site-packages/flash_attn/flash_attn_interface.py", line 79, in _flash_attn_varlen_forward
out, q, k, v, out_padded, softmax_lse, S_dmask, rng_state = flash_attn_cuda.varlen_fwd(
RuntimeError: FlashAttention only support fp16 and bf16 data type
[2023-11-14 18:06:43,085] torch.distributed.elastic.multiprocessing.api: [WARNING] Sending process 559871 closing signal SIGTERM