fix: 解决llama-2-70B(chat)模型推理阶段报错 #413
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原因：70B transformer结构num_heads与num_key_value_heads不相等
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原因：Llama-2-70B transformer结构num_heads与num_key_value_heads不相等，会导致在forward阶段计算attention时维度出现错误。参考transformers进行修改:
https://github.com/huggingface/transformers/blob/main/src/transformers/models/llama/modeling_llama.py#L263