Fail to run v2 with flash attention

I got following error message when I input a 2-mins long video with the default hyperparameter setting (beam search numbers = 1, temperature = 1, video segments = 8) and "Hi" as text input.

Input video shape: torch.Size([24, 224, 224])
n_position: 1568
pre_n_position: 784
Pretraining uses 4 frames, but current frame is 8
Interpolate the position embedding
Traceback (most recent call last):
  File "/home/ivc5/miniforge3/envs/videochat/lib/python3.10/site-packages/gradio/routes.py", line 408, in run_predict
    output = await app.get_blocks().process_api(
  File "/home/ivc5/miniforge3/envs/videochat/lib/python3.10/site-packages/gradio/blocks.py", line 1315, in process_api
    result = await self.call_function(
  File "/home/ivc5/miniforge3/envs/videochat/lib/python3.10/site-packages/gradio/blocks.py", line 1043, in call_function
    prediction = await anyio.to_thread.run_sync(
  File "/home/ivc5/miniforge3/envs/videochat/lib/python3.10/site-packages/anyio/to_thread.py", line 56, in run_sync
    return await get_async_backend().run_sync_in_worker_thread(
  File "/home/ivc5/miniforge3/envs/videochat/lib/python3.10/site-packages/anyio/_backends/_asyncio.py", line 2134, in run_sync_in_worker_thread
    return await future
  File "/home/ivc5/miniforge3/envs/videochat/lib/python3.10/site-packages/anyio/_backends/_asyncio.py", line 851, in run
    result = context.run(func, *args)
  File "demo.py", line 84, in gradio_answer
    llm_message,llm_message_token, chat_state = chat.answer(conv=chat_state, img_list=img_list, max_new_tokens=1000, num_beams=num_beams, temperature=temperature)
  File "/home/ivc5/Ask-Anything/video_chat2/conversation.py", line 64, in answer
    outputs = self.model.llama_model.generate(
  File "/home/ivc5/miniforge3/envs/videochat/lib/python3.10/site-packages/peft/peft_model.py", line 1140, in generate
    outputs = self.base_model.generate(*args, **kwargs)
  File "/home/ivc5/miniforge3/envs/videochat/lib/python3.10/site-packages/torch/utils/_contextlib.py", line 115, in decorate_context
    return func(*args, **kwargs)
  File "/home/ivc5/miniforge3/envs/videochat/lib/python3.10/site-packages/transformers/generation/utils.py", line 1485, in generate
    return self.sample(
  File "/home/ivc5/miniforge3/envs/videochat/lib/python3.10/site-packages/transformers/generation/utils.py", line 2524, in sample
    outputs = self(
  File "/home/ivc5/miniforge3/envs/videochat/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1511, in _wrapped_call_impl
    return self._call_impl(*args, **kwargs)
  File "/home/ivc5/miniforge3/envs/videochat/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1520, in _call_impl
    return forward_call(*args, **kwargs)
  File "/home/ivc5/Ask-Anything/video_chat2/models/blip2/modeling_llama_mem.py", line 674, in forward
    outputs = self.model(
  File "/home/ivc5/miniforge3/envs/videochat/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1511, in _wrapped_call_impl
    return self._call_impl(*args, **kwargs)
  File "/home/ivc5/miniforge3/envs/videochat/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1520, in _call_impl
    return forward_call(*args, **kwargs)
  File "/home/ivc5/Ask-Anything/video_chat2/models/blip2/modeling_llama_mem.py", line 563, in forward
    layer_outputs = decoder_layer(
  File "/home/ivc5/miniforge3/envs/videochat/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1511, in _wrapped_call_impl
    return self._call_impl(*args, **kwargs)
  File "/home/ivc5/miniforge3/envs/videochat/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1520, in _call_impl
    return forward_call(*args, **kwargs)
  File "/home/ivc5/Ask-Anything/video_chat2/models/blip2/modeling_llama_mem.py", line 292, in forward
    hidden_states, self_attn_weights, present_key_value = self.self_attn(
  File "/home/ivc5/miniforge3/envs/videochat/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1511, in _wrapped_call_impl
    return self._call_impl(*args, **kwargs)
  File "/home/ivc5/miniforge3/envs/videochat/lib/python3.10/site-packages/torch/nn/modules/module.py", line 1520, in _call_impl
    return forward_call(*args, **kwargs)
  File "/home/ivc5/Ask-Anything/video_chat2/models/blip2/modeling_llama_mem.py", line 220, in forward
    qkv = torch.stack([query_states, key_states, value_states], dim=2)
RuntimeError: stack expects each tensor to be equal size, but got [1, 32, 1, 128] at entry 0 and [1, 32, 121, 128] at entry 1

Reproduce the failure with the two-minute video and the stated defaults, then inspect video_chat2/models/blip2/modeling_llama_mem.py around lines 220, 292, 563, and 674, following the call from demo.py line 84. Compare the query, key, and value dimensions during generation; done means the reported configuration runs without the tensor-size stack error.