ID 原文 译文
25665 考虑到初始字典维数较高，首先，利用 Word2vec 工具将字典中的词表示成词向量形式，然后根据加权向量平均值对原始字典进行降维。 Considering that the initial dictionary dimension is high, firstly, the word inthe dictionary is represented as a word vector form via using the Word2vec tool, and then the original dictionary is reduced according to the average weighted vectors．
25666 其次，利用一种快速特征子集选择算法去除字典中不相关和冗余短文本，得到过滤后的字典。 Secondly, a fast feature subset selection algorithm is adopted to remove the irrelevant and redundant short texts in the dictionary, and the filtered dictionary can then be obtained．
25667 再次，基于稀疏表示理论在过滤后的字典上，为目标函数设计一种熵权约束的稀疏表示方法，引入拉格朗日乘数法求得目标函数的最优值，从而得到每个类的子空间。 Thirdly, based on the sparse representation theory, an improved entropy-weighted sparse representation method is designed for the objective function, andthe Lagrange multiplier method is introduced to obtain the optimal value of the objective function, thus the subspace of each class is obtained．
25668 最后，在学习到的子空间下通过计算待分类短文本与每个类中短文本的距离，并根据三种分类规则对短文本进行分类。 Finally, the distance between the short text to be classified and the short text in each class is calculated under the subspace, and the short text is classified according to three classification rules．
25669 在真实数据集上的大量实验结果表明，本文提出的方法能够有效缓解短文本特征稀疏问题且优于现有短文本分类方法。 A large number of experimental resultson real data sets show that the proposed method can effectively alleviate the short text feature sparse problem and exhibits better performance than the existing short text classification methods．
25670 精密钟差以及天顶对流层时延是 GPS PPP 解算的重要参数。 The precision clock and zenith tropospheric delay (ZTD) are important parameters of GPS PPP solution．
25671 本文通过在 PPP 数据处理过程中加入基于更新迭代的状态协方差阵作为取权因子，分别在高精度时间比对和天顶对流层时延方面利用单向滤波以及双向加权滤波对 PPP 解算的钟差及对流层时延进行估计与分析。 In this paper, the state covariance matrix based on update iteration is used for the weight calculation in GPS PPP data pro-cessing. The results of PPP are estimated by using one-way and two-way filtering weighted in time comparison and ZTD.
25672 结果表明，在零基线比对方面，经加权估计的钟差标准偏差优于单向结果，提高在 30% 以上; The results show that in the PPP zero-baseline common clock comparison, the standard deviation to the time difference of the weighted is significantly better than that of the one-way, and the deviation is increased by more than 30% ．
25673 在时间比对方面，利用加权估计的钟差与国际权度局发布的钟差在频率稳定度上水平相当; The result of frequency stability is estimated with weighted is equivalent to the Bureau International des Poids et Mesures in time comparison.
25674 最后，在天顶对流层时延估计方面，两种方法相对于 IGS 分析中心公布的天顶对流层时延的残差均方根误差中，加权估计的天顶对流层时延也略有提高。 And the root mean square of residual to the final results between two methods and the results published by the IGS for the ZTD, the results of the weighted estimation are also slightly improved．