CarryFun

## Pull Request Template ### Description [WIP] Update doc and notes for BMTrain. ### Type of Change - [ ] Bug fix (non-breaking change which fixes an issue) - [...

修改Llama2_7b参数，导出mnn模型后在android设备上咯啊的、

1

在mac上能正常运行，但在android设备上load 时出现Segmentation fault

Add MiniCPM-1.2b and MiniCPM-2.4b.

3

Add MiniCPM 1.2b and MiniCPM 2.4b. Should ues llama2 format MiniCPM model. Use llm/export/llm_models/MiniCPM-1.2b/convert_minicpm_to_llama.py.