中文说明：从MAT文件加载正样本数据。该文件包含一个为多个对象类别指定边界框的表。该表是从Training Image Labeler应用程序导出的。
English Description：
the Load the positive samples data from a MAT file. The file contains a table specifying bounding boxes for several object categories. The table was exported from the Training Image Labeler app.