Fix error when using the mat
method with NumPy version >= 2.0.0.
#254
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可能与 #206 相关
参考文件 : https://numpy.org/doc/2.2/numpy_2_0_migration_guide.html
由于numpy2 版本后有许多不相容的变化,导致使用mat会丢出例外, 最后pdf可能没被成功处理
以下修改后 #206 提供文件的测试截图