[SPARK-20805] updated updateP in SVD++ is error

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Incomplete
• Affects Version/s: 1.6.1, 2.1.1
• Component/s: GraphX
• Labels: bulk-closed
• Assignee: Unassigned
• Reporter: BoLing
• Created: 19/May/17 05:43
• Updated: 21/May/19 04:15
• Resolved: 21/May/19 04:15

Description

In algorithm svd++, we all known that the usr._2 store the value of pu + |N(u)|^(-0.5)*sum; the function sendMsgTrainF compute the updated value of updateP,updateQ and updateY. At the beginning,the cycle iteration update the part of y in usr._2, but pu is never updated. so we should fix the
sendMessageToSrcFunction in sendMsgTrainF. the old code is ctx.sendToSrc((updateP, updateY, (err - conf.gamma6 * usr._3) * conf.gamma1)). if we fix like that ctx.sendToSrc((updateP, updateP, (err - conf.gamma6 * usr._3) * conf.gamma1)), it maybe arrive the effect we want.