首先给出em算法的抽象形式，然后研究EM参数估计方法的一个应用：求高斯混合密度的参数。
First we introduce the abstract form of the EM algorithm. Then we develop the EM parameter estimation procedure for one application: finding the parameters of a mixture of Gaussian densities.
采样速度和绘图密度是由samples和isosamples决定的，标题是由title参数为图形提供的。
The sampling rate and density of the plot are determined by samples and isosamples, and a title is provided for the graph with the title parameter.
超导体的转变温度和临界电流密度是两个经常要测量的参数。
A superconductor's transition temperature and critical current density are two commonly measured parameters.
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