[Bug]: yolov5 通过ckpt和yaml转onnx之后，onnx推理报错

### 问题描述

onnxruntime.capi.onnxruntime_pybind11_state.Fail: [ONNXRuntimeError] : 1 : FAIL : Load model from C:\Users\93491\Desktop\model\yolov5\l\abc.onnx failed:Type Error: Type parameter (T) of Optype (BatchNormalization) bound to different types (tensor(float) and tensor(float16) in node (8BatchNormalization).

### 环境信息

- **Hardware Environment(`Ascend`/`GPU`/`CPU`)  / 硬件环境**: 
> Please delete the backend not involved / 请删除不涉及的后端:
> /device Ascend
> /device GPU
> /device CPU

- **Software Environment / 软件环境 (Mandatory / 必填)**:
-- MindSpore version (e.g., 2.0.0) :
-- Python version (e.g., Python 3.7.5) :
-- OS platform and distribution (e.g., Linux Ubuntu 16.04):
-- GCC/Compiler version (if compiled from source):

- **Execute Mode / 执行模式 (Mandatory / 必填)(`PyNative`/`Graph`)**: 
> Please delete the mode not involved / 请删除不涉及的模式:
> /mode pynative
> /mode graph

### 关联用例

onnxruntime.capi.onnxruntime_pybind11_state.Fail: [ONNXRuntimeError] : 1 : FAIL : Load model from C:\Users\93491\Desktop\model\yolov5\l\abc.onnx failed:Type Error: Type parameter (T) of Optype (BatchNormalization) bound to different types (tensor(float) and tensor(float16) in node (8BatchNormalization).

### 重现步骤

对onnx模型进行推理

bash run_eval_onnx.sh /home/ma-user/work/COCO2017/coco /home/ma-user/work/xxx/yolov5/l/yolov5l.onnx CPU

onnxruntime.capi.onnxruntime_pybind11_state.Fail: [ONNXRuntimeError] : 1 : FAIL : Load model from C:\Users\93491\Desktop\model\yolov5\l\abc.onnx failed:Type Error: Type parameter (T) of Optype (BatchNormalization) bound to different types (tensor(float) and tensor(float16) in node (8BatchNormalization).

### 预期结果

正常评估

### 日志/截图

[在这里上传图片]

### 备注

MindSpore Lab/mindyolo

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