芯片型号：J6M
openexplorer版本：horizon j6_open_explorer_v3.7.0
问题定位：calibration精度下降
问题描述：
参考配置：samples/ai_toolchain/horizon_model_train_sample/scripts/configs/bev/bev_sparse_henet_tinym_nuscenes.py
1. 使用参考算法+业务数据训练，校准。指标在可接受范围内
2. 保持之前的配置，加大数据量训练，出现训练崩溃。关掉AMP后float模型训练正常。但是校准阶段精度下降明显，mAP 下降15%左右
1. 使用参考算法+业务数据训练，校准。指标在可接受范围内
2. 保持之前的配置，加大数据量训练，出现训练崩溃。关掉AMP后float模型训练正常。但是校准阶段精度下降明显，mAP 下降15%左右
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