Spark distributed matrix multiply and pseudo-inverse calculating -


i new in apache spark scala. can me operations?

i have 2 distributed matrix h , y in spark scala.

i want compute pseudo-inverse of h , multiply h , y.

how can this?

here implementation inverse.

import org.apache.spark.mllib.linalg.{vectors,vector,matrix,singularvaluedecomposition,densematrix,densevector} import org.apache.spark.mllib.linalg.distributed.rowmatrix  def computeinverse(x: rowmatrix): densematrix = {   val ncoef = x.numcols.toint   val svd = x.computesvd(ncoef, computeu = true)   if (svd.s.size < ncoef) {     sys.error(s"rowmatrix.computeinverse called on singular matrix.")   }    // create inv diagonal matrix s    val invs = densematrix.diag(new densevector(svd.s.toarray.map(x => math.pow(x,-1))))    // u cannot rowmatrix   val u = new densematrix(svd.u.numrows().toint,svd.u.numcols().toint,svd.u.rows.collect.flatmap(x => x.toarray))    // if make v distributed, may better. alreadly local...so maybe fine.   val v = svd.v   // inv(x) = v*inv(s)*transpose(u)  --- u transposed.   (v.multiply(invs)).multiply(u)   }

Comments

Post a Comment

Popular posts from this blog

jquery - How do you format the date used in the popover widget title of FullCalendar? -

Image
in fullcalendar, how format date used in popover widget title when clicking '+n more'? code: <div class="fc-popover fc-more-popover"> <div class="fc-header fc-widget-header"> <span class="fc-close fc-icon fc-icon-x"></span> <span class="fc-title">tuesday, april 7</span> ... </div> ... </div> you use daypopoverformat that. determines date format of title of popover created eventlimitclick option. must date formatting string. default value "dddd, mmmm d" english , "ll" other languages.
Read more

asp.net mvc - SSO between MVCForum and Umbraco7 -

i need integrate sso between mvcforum (forum of company) , umbraco7 (manages cms company). however struggling shared authentication work. tried several ways suggested on other threads still not running expected. here did: 1. in mvcforum (forum.mywebsite.com) 1.1. machine key in web.xml: <machinekey validationkey="the same key umbraco7" decryptionkey="the same key umbraco7" validation="sha1" decryption="aes" /> 1.2. authenticate forms in web.xml <forms name="my-sso-auth" protection="all" path="/" timeout="43200" domain="forum.mywebsite.com" loginurl="/members/logon" enablecrossappredirects="true" /> 2. in umbraco7 (news.mywebsite.com) 2.1. machine key in web.xml: <machinekey validationkey="the same key mvcforum" decryptionkey="the same key mvcforum" validation="sha1" decryption="aes" /> 2.2. a...
Read more

Python Tkinter keyboard using bind -

i have problem using bind option can click button in keyboard, , call function once key pressed. tried taking other codes have similar purpose , saw i'm doing pretty same, though still have problem must've missed. thankful if me this. here's code: # -*- coding: utf-8 -*- #imports tkinter import * pil import imagetk, image import time import tkmessagebox #===========================================================================================================================================# #tkinter class class app(frame): def __init__(self, master=none): frame.__init__(self, master) self.pack() #===========================================================================================================================================# #game pieces classes class board: def __init__(self, rows = 7, columns = 6, picture_height = none, picture_width = none): self.rows = rows self.columns = columns self.picture ...
Read more