摘要：偏航角零点漂移严重影响风电机组性能，将之消除的 前提是对其进行可靠且快速的检测。基于风能捕获机理，该 文提出一种运用机器学习算法的偏航角零点漂移诊断方法。首先，采用孤立森林(isolated forest，IF)异常值检测算法对 数据进行预处理；其次，建立非参数模型稀疏高斯过程回归 基金项目：国家自然科学基金项目(...
首先,采用孤立森林(isolated forest,IF)异常值检测算法对数据进行预处理;其次,建立非参数模型稀疏高斯过程回归(sparse Gaussian process regression,SGPR)估计偏航角零点漂移;最后,利用多个风电场的风电机组实际运行数据对所提方法进行验证,并分析不同诊断模型对数据量的依赖性.结果表明:IF+SGPR方法准确性高,所需数据量...
and characteristics of abnormal data of water consumption at the present stage, firstly, the average interpolation method is used to pre-process the outliers, and random sampling training is performed in the pre-processed data to establish multiple isolated binary trees to form isolation forest. The...
Through the performance test and expansive test, it could be concluded that Spark-IForest could achieve satisfactory results in terms of AUC, and in the multi-core parallel scenario, the speed of Spark-IForest is improved a lot compared with stand-alone Spark-IForest and Sklearn-IFores. In...
Additionally, iForest has “a low constant and low memory requirement” i.e. low overhead. Specifics: the number of external nodes is n since each observation, n, is isolated by itself. The total number of internal nodes is clearly n-1, and the total number nodes is 2n-1. Hence, we...
关键词：异常数据检测;孤立森林;选择性集成;B P S O-i F o r e s t 中图分类号.■TP391 文献标识码:A文章编号：1000-1220(2021)01~0127>05 Improved Isolation Forest Method for WSN Anomaly Data Detection W U Z h i-q i a n g1,ZHANG S h e n g1,2,BAO X i a o-l i n g2,...
Isolation Forest recursively generates partitions on the dataset by randomly selecting a feature and then randomly selecting a split value for the feature. Presumably the anomalies need fewer random partitions to be isolated compared to "normal" points in the dataset, so the anomalies will be the ...
aI am a solitary observer on this isolated pond in the forest 我是一名孤零零观察员在这个被隔绝的池塘在森林里 [translate] 英语翻译 日语翻译 韩语翻译 德语翻译 法语翻译 俄语翻译 阿拉伯语翻译 西班牙语翻译 葡萄牙语翻译 意大利语翻译 荷兰语翻译 瑞典语翻译 希腊语翻译 51La ...
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We examined the influence of forest fragmentation on species composition of non- flying mammals. We classified the study sites into three isolation gradients (mountain for- est, continuous forest, and isolated forest), depending on the degree of isolation of each for- est type, and chose three ...