In professional environment, there are a lot of tasks that either require a Excel file as source, or one as a delivery, and most of time we ourselves have minimized the workload to an extent that it has become a daily boring task. What if I tell you there is a way to potentially [...]
xgboost在代价函数里加入了正则项，用于控制模型的复杂度。正则项里包含了树的叶子节点个数、每个叶子节点上输出的score的L2模的平方和。
3 or more Hidden Layer then you have a deep network Activation Function Hyperbolic Tangent: $$tanh(z)$$, where $$z = wx+b$$ cosh(x) = \frac{e^x + e^{-x}}{2} sinh(x) = \frac{e^x - e^{-x}}{2} tanh(x) = \frac{sinh(x)}{cosh(x)} The graph looks like this Rectified Linear Unit(ReLU): relatively simple function: max(0, z) Cost Function Quadratic Cost $$C = \sum(y-a)^2/n$$, where $$a$$ is [...]
Just received a Python coding challenge and I believe it would be useful to share.
Simon received the board game Ticket to Ride as a birthday present. After playing it with his friends, he decides to come up with a strategy for the game.
Here is a complete version of Python2.7 code regarding the problematic original version. Just paste in in any .py file and run.
个人认为可变对象和深浅拷贝是未来编程首要注意的事情，毕竟如果是这个上面出现bug应该比较难察觉。
编写程序，提示输入大于2的整数（检查），然后反复求该数字的平方根直到小于2，显示每次得到的平方根与已经完成的操作次数，输出时采用3位小数的格式
找到一个以不变应万变的Python爬虫Protocol是首要的任务。那么接下来就通过实例来介绍我自己所采用的一个Requests+Selenium+BeautifulSoup的Python爬虫Protocol
本人最新希望重启微博，但是苦于之前转发了太多无营养的东西而微博不能够方便地一键删除，于是就从知乎上找到了Python的一个小程序，自己捣鼓捣鼓改改代码就OK了，大家需要改动的地方我已经标出来了，对号入座就可以。