中文说明：在模式识别和机器学习中，特征向量是表示某个对象的数值特征的n维向量。机器学习中的许多算法需要对象的数字表示，因为这样的表示便于处理和统计分析。当表示图像时，特征值可能对应于图像的像素，而当表示文本时，特征可能是文本的出现频率
English Description：
In pattern recognition and machine learning, a feature vector is an n-dimensional vector of numerical features that represent some object. Many algorithms in machine learning require a numerical representation of objects, since such representations facilitate processing and statistical analysis. When representing images, the feature values might correspond to the pixels of an image, while when representing texts the features might be the frequencies of occurrence of textual ter