查询词典 sparseness

Feature selection is one of the key problems in text categorization. The chief obstacles to feature selection are noise and sparseness.

特征选择是文本分类的关键问题之一，而噪音与数据稀疏则是特征选择过程中遇到的主要障碍。

The high sparseness of LPBNMF features is assured by the inherent characteristics of its mathematic model.

LPBNMF降维通过线性变换来完成，它所采用的数学模型的自身结构特点决定了由其得到的特征一定非常稀疏。

This algorithm not only improves search speed,but also needs a smaller space for data store than others and reduces the data sparseness.

实验证明该算法不仅提高了查询速度，而且占用的存储空间也较少，进一步减少了数据的稀疏。

Accuracy of the 4 methods was compared for sparseness and defect of anterior wall with reference to the results of coronary angiography.

以冠状动脉造影结果为标准，比较4种方法判断前壁稀疏缺损的准确性。

The predicting speed of Support Vector Regression is proportional to its sparseness.

支持向量回归机是一种解决回归问题的重要方法，其预测速度与支持向量的稀疏性成正比。

In the process of sparseness, it needn't to consider the surface idiographic features, so it brings out much convenience for practice operation.

由于稀化过程中不需要考虑曲面的具体特征，给实际操作带来了极大的方便。

Accuracy of the 4 methods was compared for sparseness and defect of anterior wall with reference to the results of coronary angiography.

以冠状动脉造影结果标准，比较4种方法判断前壁稀疏缺损的准确性。

The proposed method utilizes the sparseness characteristic to extract source signals, and does not demand the sources be independent.

该方法利用稀疏性提取源信号，不要求源成分之间互不相关。

Sparseness in angle space implies that only a few of the dictionary entries will be needed to match the measurements.

在角度空间中的稀疏性意味着，要与测量值匹配将只需要很少几个词典项。

The chief obstacles to feature selection are noise and sparseness.

本文介绍了一种基于类别特征域的特征选择方法。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。