芯片型号：J6M
openexplorer版本：horizon j6_open_explorer_v3.2.0-py310_20250616
问题定位：模型转换精度下降。
问题描述：模型结构及参数基本与参考配置一致，只是dataset不一样
参考配置：samples/ai_toolchain/horizon_model_train_sample/scripts/configs/bev/bev_sparse_henet_tinym_nuscenes.py
按照官方配置训练float模型，模型精度NDS 0.4625，mAP 0.1928
按照官方配置转calibration模型，模型精度NDS 0.4024，mAP 0.0778
按照官方配置进行qat训练，模型精度NDS: 0.4102, mAP 0.0948
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