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機(jī)器學(xué)習(xí)算法之線性回歸 最小二乘法和嶺回歸算法的實(shí)現(xiàn),對(duì)應(yīng)博文為: http://blog.csdn.net/suipingsp/article/details/42101139

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代碼片段和文件信息

‘‘‘Created?on?Jun06?2014
Linear?Regression?algorithm?support?ordinary?least?squares?ridge?Regression
andetc.?
@author:?Aidan
‘‘‘

from?numpy?import?*
from?object_json?import?*
from?copy?import?*
import?pdb
import?operator


class?linearRegress(object):
????def?__init__(selfLRDict?=?None??**args):
????????‘‘‘currently?support?OLS?ridge?LWLR???????????
????????‘‘‘
????????obj_list?=?inspect.stack()[1][-2]
????????self.__name__?=?obj_list[0].split(‘=‘)[0].strip()
????????if?not?LRDict:
????????????self.LRDict?=?{}
????????else:
????????????self.LRDict?=?LRDict
????????????#to?Numpy?matraix
????????????if?‘OLS‘?in?self.LRDict:
????????????????self.LRDict[‘OLS‘]?=?mat(self.LRDict[‘OLS‘])
????????????if?‘ridge‘?in?self.LRDict:
????????????????self.LRDict[‘ridge‘][0]?=?mat(self.LRDict[‘ridge‘][0])
????????????????self.LRDict[‘ridge‘][2]?=?mat(self.LRDict[‘ridge‘][2])
????????????????self.LRDict[‘ridge‘][3]?=?mat(self.LRDict[‘ridge‘][3])
????????????????self.LRDict[‘ridge‘][4]?=?mat(self.LRDict[‘ridge‘][4])
????????
????def?jsonDumpsTransfer(self):
????????‘‘‘essential?transformation?to?Python?basic?type?in?order?to
????????store?as?json.?dumps?as?objectname.json?if?filename?missed?‘‘‘
????????#pdb.set_trace()
????????if?‘OLS‘?in?self.LRDict:
????????????self.LRDict[‘OLS‘]?=?self.LRDict[‘OLS‘].tolist()
????????if?‘ridge‘?in?self.LRDict:
????????????????self.LRDict[‘ridge‘][0]?=?self.LRDict[‘ridge‘][0].tolist()
????????????????self.LRDict[‘ridge‘][2]?=?self.LRDict[‘ridge‘][2].tolist()
????????????????self.LRDict[‘ridge‘][3]?=?self.LRDict[‘ridge‘][3].tolist()
????????????????self.LRDict[‘ridge‘][4]?=?self.LRDict[‘ridge‘][4].tolist()

????def?jsonDumps(self?filename=None):
????????‘‘‘dumps?to?json?file‘‘‘
????????self.jsonDumpsTransfer()
????????if?not?filename:
????????????jsonfile?=?self.__name__+‘.json‘
????????else:?jsonfile?=?filename
????????objectDumps2File(self?jsonfile)
????????
????def?jsonloadTransfer(self):??????
????????‘‘‘essential?transformation?to?object?required?type?such?as?numpy?matrix
????????call?this?function?after?newobject?=?objectLoadFromFile(jsonfile)‘‘‘
????????#pdb.set_trace()
????????if?‘OLS‘?in?self.LRDict:
????????????self.LRDict[‘OLS‘]?=?mat(self.LRDict[‘OLS‘])
????????if?‘ridge‘?in?self.LRDict:
????????????self.LRDict[‘ridge‘][0]?=?mat(self.LRDict[‘ridge‘][0])
????????????self.LRDict[‘ridge‘][2]?=?mat(self.LRDict[‘ridge‘][2])
????????????self.LRDict[‘ridge‘][3]?=?mat(self.LRDict[‘ridge‘][3])
????????????self.LRDict[‘ridge‘][4]?=?mat(self.LRDict[‘ridge‘][4])

????def?solver_OLS(self?xMat?yMat):
????????x0Mat?=?mat(ones((xMat.shape[0]1)))
????????xMat?=?hstack((x0Mat?xMat))#extend?x0=1?for?each?sample
????????xTx?=?xMat.T*xMat
????????if?linalg.det(xTx)?==?0.0:
????????????print?“This?matrix?is?singular?cannot?do?inverse“
????????????#raise
????????else:
????????????self.LRDict[‘OLS‘]?=?xTx.I?*?(xMat.T*yMat)
????
????
????def?solver_ridg

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????文件?????197357??2011-01-19?17:17??linear_regression\abalone.txt

?????文件???????5600??2011-01-08?10:02??linear_regression\ex0.txt

?????文件???????5600??2011-01-18?17:18??linear_regression\ex1.txt

?????文件???????5850??2014-12-22?09:38??linear_regression\linearregress.py

?????文件???????5928??2014-12-22?09:26??linear_regression\linearregress.pyc

?????文件???????2789??2014-12-01?12:11??linear_regression\object_json.py

?????文件???????4100??2014-12-19?10:04??linear_regression\object_json.pyc

?????文件???????4833??2014-12-22?09:26??linear_regression\testlinearregress.py

?????目錄??????????0??2014-12-22?09:46??linear_regression

-----------?---------??----------?-----??----

???????????????232057????????????????????9


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