python 2.7 - Trouble importing logRegres -

i having problem during importing below mentioned library gives error below class not found. can guide me how install library?

import logregres   dataarr,labelmat=logregres.loaddataset()   logregres.gradascent(dataarr,labelmat)   matrix([[ 4.12414349],[ 0.48007329],[-0.6168482 ]])