add some comments
Generate input data. Correctness verification with fixed threshold 1.0 .
move svd.py to src/svd.py
SVD_CV_1.0 Calculate output distance between original and reduced level matrix with the change of threshold k. And write data into file.
SVD_CV_1.1 Plot output data.
SVD_CV_1.2 Take section of reading level matrix and reading input matrix, as independent function.
OutputHistogram_v1.0 Plot output histogram of sublevel.
SVDQ_1.0  Add a quantified version of SVD.