中文说明：
可以利用此代码完成信息熵及其互信息直接的计算，解决互信息在实际计算中不好求解的情况。此代码在matlab中可正常运行。
English Description：
This code can be used to complete the direct calculation of information entropy and mutual information, so as to solve the situation that mutual information is difficult to solve in actual calculation. This code can run normally in MATLAB.