Update README.md

Author: zhaozhiyong19890102

README.md

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 # Python机器学习算法
 
-![这里写图片描述](//img10.360buyimg.com/n1/jfs/t6391/74/1115083732/144183/2a82437f/594b5bb8Na3c6dfd4.jpg)
+<center>
+![这里写图片描述](http://img10.360buyimg.com/n1/jfs/t6391/74/1115083732/144183/2a82437f/594b5bb8Na3c6dfd4.jpg)
+</center>
 
 程序代码是《Python机器学习算法》的示例代码，目前该书在各大商城已经可以预定：
 
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 ## 本书特色
 
+本书是一本机器学习入门读物，注重理论与实践的结合。全书主要包括6 个部分，每个部分以典型的机器学习算法为例，从算法原理出发，由浅入深，详细分析算法的理论，并配合目前流行的Python 语言，从零开始，实现每一个算法，以加强对机器学习算法理论的理解和增强实际的算法实践能力，最终达到熟练掌握每一个算法的目的。与其他机器学习类书相比，本书同时包含算法理论的介绍和算法的实践，以理论支撑实践，同时，又将复杂，枯燥的理论用简单易懂的形式表达出来，促进对理论的理解。
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 ## 目录
 
+
+<center>
 ![这里写图片描述](http://img.blog.csdn.net/20170705094315143?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvZ29vZ2xlMTk4OTAxMDI=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
+</center>
 
+<center>
 ![这里写图片描述](http://img.blog.csdn.net/20170705094330627?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvZ29vZ2xlMTk4OTAxMDI=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
+</center>
 
+<center>
 ![这里写图片描述](http://img.blog.csdn.net/20170705094454527?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvZ29vZ2xlMTk4OTAxMDI=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
+</center>
 
+<center>
 ![这里写图片描述](http://img.blog.csdn.net/20170705094511813?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvZ29vZ2xlMTk4OTAxMDI=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
+</center>
 
+<center>
 ![这里写图片描述](http://img.blog.csdn.net/20170705094527619?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvZ29vZ2xlMTk4OTAxMDI=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
+</center>
 
+<center>
 ![这里写图片描述](http://img.blog.csdn.net/20170705094546703?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvZ29vZ2xlMTk4OTAxMDI=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
+</center>
 
+<center>
 ![这里写图片描述](http://img.blog.csdn.net/20170705094612914?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvZ29vZ2xlMTk4OTAxMDI=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
+</center>
 
+<center>
 ![这里写图片描述](http://img.blog.csdn.net/20170705094627711?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvZ29vZ2xlMTk4OTAxMDI=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
+</center>
 
+<center>
 ![这里写图片描述](http://img.blog.csdn.net/20170705094651158?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvZ29vZ2xlMTk4OTAxMDI=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
+</center>
 
+<center>
 ![这里写图片描述](http://img.blog.csdn.net/20170705094718211?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvZ29vZ2xlMTk4OTAxMDI=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
+</center>
 
+<center>
 ![这里写图片描述](http://img.blog.csdn.net/20170705094736571?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvZ29vZ2xlMTk4OTAxMDI=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
+</center>
+
+同时，我还为本书设置了QQ群：
+
+<center>
+![这里写图片描述](http://img.blog.csdn.net/20170704222450090?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvZ29vZ2xlMTk4OTAxMDI=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
+</center>