中文说明：部分实现了追踪测速迭代松弛算法，对于初学者具有参考意义，鲁棒性好，性能优越，有均匀线阵的CRB曲线，包括最小二乘法、SVM、神经网络、1_k近邻法,用于建立主成分分析模型。
English Description：
Part of the implementation of the tracking velocimetry iterative relaxation algorithm, for beginners has reference significance and good robustness, superior performance, uniform linear array of CRB curve, including the least squares method, SVM, neural network, 1 K nearest neighbor method for a principal component analysis (PCA) model.