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重要的资源
说明: python神经网络书中的代码,非常使用的学习资料(the code in, this is trully useful)
- 2019-04-18 18:29:43下载
- 积分:1
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Python
说明: python排序程序,基于冒泡法排序,可用于成绩自动化排序修改excel(Python sorting program, examples of sorting bubble method, can be used to automate the sorting of results to modify Excel)
- 2019-03-25 18:37:51下载
- 积分:1
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简单的简书爬虫
通过简单的爬虫知识,运用Scrapy爬虫框架完成对简书用户信息爬取。
- 2022-12-13 12:40:03下载
- 积分:1
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xgboost算法
说明: 利用xgboost对多变量结果进行预测分析的学习,建立模型(Using xgboost to study the prediction and analysis of multivariate results and build a model)
- 2020-11-23 15:29:34下载
- 积分:1
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adaboost
AdaBoost元算法属于boosting系统融合方法中最流行的一种,说白了就是一种串行训练并且最后加权累加的系统融合方法。
具体的流程是:每一个训练样例都赋予相同的权重,并且权重满足归一化,经过第一个分类器分类之后,
计算第一个分类器的权重alpha值,并且更新每一个训练样例的权重,然后再进行第二个分类器的训练,相同的方法.......
直到错误率为0或者达到指定的训练轮数,其中最后预测的标签计算是各系统*alpha的加权和,然后sign(预测值)。
可以看出,训练流程是串行的,并且训练样例的权重是一直在变化的,分错的样本的权重不断加大,正确的样本的权重不断减小。
AdaBoost元算法是boosting中流行的一种,还有其他的系统融合的方法,比如bagging方法以及随机森林。
对于非均衡样本的处理,一般可以通过欠抽样(undersampling)或者过抽样(oversampling),欠抽样是削减样本的数目,
过抽样是重复的选取某些样本,最好的方法是两种进行结合的方法。
同时可以通过删除离决策边界比较远的样例。
(AdaBoost boosting systems dollar fusion algorithm is the most popular one, it plainly systems integration approach is a serial train and final weighted cumulative.
Specific process is: Each training example is given equal weight, and the weights satisfy normalization, after the first classifiers after
Calculating a first classifier weights alpha value for each sample and updates right weight training, and then the second classifier training, the same way .......
0, or until the specified error rate training rounds, wherein the label is the calculation of the final prediction system* alpha weighted and then sign (predicted value).
As can be seen, the training process is serial, and weight training examples is always changing, the right of the wrong sample weight continued to increase, the right to correct sample weight decreasing.
AdaBoost algorithm is an element, as well as other methods of boosting popular systems integration, such as bagging and random forest method.
For )
- 2014-07-09 19:24:29下载
- 积分:1
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DFDOC
system of pv control for basic with error
- 2013-11-23 18:55:07下载
- 积分:1
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30号作业
说明: python实现密度峰值聚类
及相关测试数据机(Python realizes density peak clustering)
- 2021-01-14 09:38:47下载
- 积分:1
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_神经网络与深度学习_邱锡鹏
说明: 神经网络与深度学习教科书————复旦大学邱锡鹏(Neural Network and Deep Learning Textbook)
- 2019-06-03 10:05:20下载
- 积分:1
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SOM神经网络
说明: SOM神经网络算法python代码,详细的表达了SOM神经网络算法的计算过程(SOM neural network algorithm python code, the detailed expression of SOM neural network algorithm calculation process)
- 2020-05-09 23:15:21下载
- 积分:1
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SIF
说明: GOME-2数据反演叶绿素荧光算法代码,添加文件为GOME-2 level 1b级数据时,得到的Fs数组即为反演结果(Code of chlorophyll fluorescence algorithm retrieved from GOME-2 data)
- 2021-01-16 13:28:45下载
- 积分:1