The author takes light source of the rectangle optical spectrum as an example to calculate time relevant degree and briefly describes Fourier's spectroscopy principle.
以矩形谱线的光源为例，计算了时间相干度，简要介绍了傅里叶变换光谱学原理。
It applies the concept and association expansion to text feature vectors in order to reduce the relevant degree of terms and enhance the ability to represent the text theme.
其基本思想是：对于文本特征向量进行概念扩充，减少特征项之间的相关性，增强特征项的表现能力。
It applies the concept and association expansion to text feature vectors in order to reduce the relevant degree of terms and enhance the ability to represent the text theme.
其基本思想是：对于文本特征向量进行概念扩充，减少特征项之间的相关性，增强特征项的表现能力。
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