發(fā)布時間：2018-04-04 21:34

  本文選題：半監(jiān)督學習　切入點：數(shù)據(jù)驅動　出處：《江蘇大學》2017年碩士論文

【摘要】：機器學習已成為計算機獲取知識的重要途徑和人工智能的重要標志。傳統(tǒng)的機器學習技術需要使用大量有標記樣本進行訓練,然而在很多實際應用中,獲取大量的有標記樣本相當困難,而獲取大量未標記樣本則相對容易得多。因此,只需標注少量樣本的半監(jiān)督學習方法在模式識別和機器學習領域引起了極大的關注。本文主要針對半監(jiān)督學習的聚類與分類問題展開研究,完成的主要工作如下:根據(jù)半監(jiān)督學習理論中協(xié)同訓練的思想,本文提出一種基于協(xié)同訓練的支持向量機分類算法。該算法通過兩個不同的SVM分類器,獲取已標記樣本中的信息,再分別預測未標記樣本的標類。利用相互驗證方法篩選具有高置信度的結果,擴充標記樣本,根據(jù)擴充后的標記樣本,更新訓練器實現(xiàn)半監(jiān)督學習。該方法在保證識別精度情況下,簡化了學習過程。利用UCI數(shù)據(jù)集,結合DAG-SVMs多分類策略證明了在標記樣本較少的情況下本算法具有較高的分類精度,最后將算法應用于原核蛋白蛹化點位的分類,獲得了良好的效果。針對當初始標記樣本量過少而導致的半監(jiān)督學習無法有效修正學習器的問題,本文提出一種基于聚類分析的自訓練SVM分類算法。該算法首先選用半監(jiān)督模糊c均值聚類算法,挖掘整體樣本信息,再使用自訓練SVM實現(xiàn)樣本分類,算法中通過二次篩選方法減少了錯分概率。本文考慮到時間序列的特殊性質,依據(jù)結構學習原理,提出一種有監(jiān)督重構算法,實現(xiàn)對原始時間序列的降維和特征提取。最后通過UCR數(shù)據(jù)集實驗證明了本算法的有效性,并將算法應用到化學物質細胞毒性評估實驗邊緣效應的檢測,獲得了良好的檢測效果。
[Abstract]:Machine learning has become an important way for computer to acquire knowledge and an important symbol of artificial intelligence.Traditional machine learning technology needs to use a large number of labeled samples for training. However, in many practical applications, it is difficult to obtain a large number of labeled samples, but it is much easier to obtain a large number of unlabeled samples.Therefore, semi-supervised learning with only a small number of samples has attracted much attention in the field of pattern recognition and machine learning.This paper focuses on the clustering and classification of semi-supervised learning. The main work is as follows: according to the idea of cooperative training in semi-supervised learning theory, this paper proposes a support vector machine classification algorithm based on cooperative training.The algorithm uses two different SVM classifiers to obtain the information from the labeled samples and then predict the unlabeled samples respectively.The results with high confidence are screened by mutual verification method, and the labeled samples are expanded. According to the expanded tag samples, the semi-supervised learning is realized by updating the training device.This method simplifies the learning process under the condition that the recognition accuracy is guaranteed.Using UCI data set and DAG-SVMs multi-classification strategy, it is proved that this algorithm has higher classification accuracy when the number of labeled samples is small. Finally, the algorithm is applied to the classification of pupae position of prokaryotic protein, and good results are obtained.In order to solve the problem that semi-supervised learning can not effectively correct the learner when the initial sample size is too small, a self-training SVM classification algorithm based on clustering analysis is proposed in this paper.First, the semi-supervised fuzzy c-means clustering algorithm is used to mine the whole sample information, and then the self-training SVM is used to realize the classification of samples. In the algorithm, the probability of misdivision is reduced by using the quadratic filtering method.Considering the special properties of time series and based on the principle of structural learning, a supervised reconstruction algorithm is proposed to extract the dimensionality of the original time series.Finally, the effectiveness of the algorithm is proved by the UCR dataset experiment, and the algorithm is applied to the detection of the edge effect in the cytotoxicity assessment experiment of chemical substances, and a good detection effect is obtained.
【學位授予單位】：江蘇大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP181

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本文編號：1711762