import?numpy?as?np
import?matplotlib.pyplot?as?plt


#?Read?dataset
x?y?=?[]?[]
for?sample?in?open（“../_Data/prices.txt“?“r“）:
????xx?yy?=?sample.split（““）
????x.append（float（xx））
????y.append（float（yy））
x?y?=?np.array（x）?np.array（y）
#?Perform?normalization
x?=?（x?-?x.mean（））?/?x.std（）
#?Scatter?dataset
plt.figure（）
plt.scatter（x?y?c=“g“?s=20）
plt.show（）

x0?=?np.linspace（-2?4?100）


#?Get?regression?model?under?LSE?criterion?with?degree?‘deg‘
def?get_model（deg）:
????return?lambda?input_x=x0:?np.polyval（np.polyfit（x?y?deg）?input_x）


#?Get?the?cost?of?regression?model?above?under?given?x?y
def?get_cost（deg?input_x?input_y）:
????return?0.5?*?（（get_model（deg）（input_x）?-?input_y）?**?2）.sum（）

#?Set?degrees
test_set?=?（1?4?10）
for?d?in?test_set:
????print（get_cost（d?x?y））

#?Visualize?results
plt.scatter（x?y?c=“g“?s=20）
for?d?in?test_set:
????plt.plot（x0?get_model（d）（）?label=“degree?=?{}“.format（d））
plt.xlim（-2?4）
plt.ylim（1e5?8e5）
plt.legend（）
plt.show（）

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\
?????文件????????1184??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\.gitignore
?????目錄???????????0??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Data\
?????文件?????????120??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Data\balloon1.0（en）.txt
?????文件?????????438??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Data\balloon1.0.txt
?????文件?????????438??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Data\balloon1.5.txt
?????文件?????????424??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Data\balloon2.0.txt
?????文件?????5604839??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Data\bank1.0.txt
?????文件?????8559529??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Data\cifar10.txt
?????文件?????5205193??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Data\madelon.txt
?????文件?????8103179??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Data\mnist.txt
?????文件??????373704??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Data\mushroom.txt
?????文件?????????563??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Data\prices.txt
?????文件?????????379??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Data\test.txt
?????目錄???????????0??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Dist\
?????目錄???????????0??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Dist\ImageRecognition\
?????目錄???????????0??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Dist\ImageRecognition\_Data\
?????目錄???????????0??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Dist\ImageRecognition\_Data\_Cache\
?????文件??????????80??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Dist\ImageRecognition\_Data\_Cache\LABEL_DIC.npy
?????文件???????????0??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Dist\ImageRecognition\_Data\Put?Training?Dataset?FOLDERS?here
?????文件????????6108??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Dist\ImageRecognition\Main.py
?????目錄???????????0??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Dist\ImageRecognition\Models\
?????目錄???????????0??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Dist\ImageRecognition\Models\Extractors\
?????目錄???????????0??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Dist\ImageRecognition\Models\Extractors\v3\
?????文件???????????0??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Dist\ImageRecognition\Models\Extractors\v3\Put?v3?Extractor?here?as?‘Model.pb‘
?????文件????????2946??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Dist\ImageRecognition\README.md
?????目錄???????????0??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Dist\ImageRecognition\Test\
?????文件???????????0??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Dist\ImageRecognition\Test\Put?testing?pictures?here
?????文件???????19644??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Dist\ImageRecognition\ToolBox.py
?????目錄???????????0??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Dist\NeuralNetworks\
?????目錄???????????0??2018-06-21?15:25??MachineLearning-master\MachineLearning-master\_Dist\NeuralNetworks\_Tests\
............此處省略278個文件信息