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 Re: [Crf-users] Crf-users Digest, Vol 7, Issue 1 From: - 2007-03-02 17:13:05 ```Hi Xiaofeng, Can you please clarify whether you need P( y(i) | x, y(0)y(1)y(2)....y(i-1) ) or P( y(i) | x, y(0)y(1)y(2)....y(i-1)y(i+1)....y(n) ) where x is the data sequence and y(i) is the label of the ith token. 1. For the probability of the best label sequence, you can use the method applyAndScore() in class CRF. 2. As far as I know, winningLabel[y(i)][i] basically holds the score of the best labelling sequence upto ith token with the label of the ith token as y(i). winningLabel[y(i)][i] will help you get a score proportional to the " probability that y(i) is the label of the ith token given the best label sequence for x(0)...x(i-1)". P( y(i) | x, y(0)y(1)y(2)....y(i-1) ) where y(0)y(1)y(2)....y(i-1) is the best lable sequence for x(0)....x(i-1). Amit, do you agree with point 2 above. Regards, Kaushal Mittal. > Send Crf-users mailing list submissions to > crf-users@... > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.sourceforge.net/lists/listinfo/crf-users > or, via email, send a message with subject or body 'help' to > crf-users-request@... > > You can reach the person managing the list at > crf-users-owner@... > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Crf-users digest..." > > > Today's Topics: > > 1. Re: Calculating probability distribution at every pos in > sequence (Amit Jaiswal) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Thu, 1 Mar 2007 11:29:12 +0530 > From: "Amit Jaiswal" > Subject: Re: [Crf-users] Calculating probability distribution at every > pos in sequence > To: crf-users@... > Message-ID: > <5dbd037b0702282159u256519c9s3895bb6ac21bee80@...> > Content-Type: text/plain; charset="iso-8859-1" > > Hi, > Can somebody who has done such thing before reply to this query. In > Viterbi > class, only the Mi and Ri matrices are calculated. Alpha and beta matrices > are not calculated which I guess will be required for calculating the > probability distribution at every position in the most probable sequence. > > > -amit > > On 3/1/07, crf-users-request@... < > crf-users-request@...> wrote: >> >> Send Crf-users mailing list submissions to >> crf-users@... >> >> To subscribe or unsubscribe via the World Wide Web, visit >> https://lists.sourceforge.net/lists/listinfo/crf-users >> or, via email, send a message with subject or body 'help' to >> crf-users-request@... >> >> You can reach the person managing the list at >> crf-users-owner@... >> >> When replying, please edit your Subject line so it is more specific >> than "Re: Contents of Crf-users digest..." >> >> >> Today's Topics: >> >> 1. Can somebody help me ? (xiaofeng wu) >> 2. how to get the probability of each label at every position in >> the sequence? (xiaofeng wu) >> >> >> ---------------------------------------------------------------------- >> >> Message: 1 >> Date: Wed, 28 Feb 2007 14:29:05 +0600 >> From: xiaofeng wu >> Subject: [Crf-users] Can somebody help me ? >> To: "crf-users@..." >> >> Message-ID: <200702281429048901635@...> >> Content-Type: text/plain; charset="gb2312" >> >> hi, >> Did some one have tried to get the probability of each label at every >> position in the sequence? I think the winningLabel[][] can get what I >> want,but should I use the forward viterbi togather with the backward >> viterbi(according to John Lafferty's paper, page 5 P(Yi=y|x)=...)? >> Hope some one can help me out of this ! >> Thanks in advance. >> Best >> >> >> >> >> xiaofeng wu >> 2007-02-28 >> >> >> >> ______________________________ >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> >> ------------------------------ >> >> Message: 2 >> Date: Wed, 28 Feb 2007 15:09:59 +0600 >> From: xiaofeng wu >> Subject: [Crf-users] how to get the probability of each label at every >> position in the sequence? >> To: crf-users >> Message-ID: <200702281509592819724@...> >> Content-Type: text/plain; charset="gb2312" >> >> hi, >> Did some one have tried to get the probability of each label at every >> position in the sequence? I think the winningLabel[][] can get what I >> want,but should I use the forward viterbi togather with the backward >> viterbi(according to John Lafferty's paper, page 5 P(Yi=y|x)=...)? >> Hope some one can help me out of this ! >> Thanks in advance. >> Best >> >> >> >> >> xiaofeng wu >> 2007-02-28 >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> >> ------------------------------ >> >> ------------------------------------------------------------------------- >> Take Surveys. Earn Cash. Influence the Future of IT >> Join SourceForge.net's Techsay panel and you'll get the chance to share >> your >> opinions on IT & business topics through brief surveys-and earn cash >> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >> >> ------------------------------ >> >> _______________________________________________ >> Crf-users mailing list >> Crf-users@... >> https://lists.sourceforge.net/lists/listinfo/crf-users >> >> >> End of Crf-users Digest, Vol 6, Issue 4 >> *************************************** >> > -------------- next part -------------- > An HTML attachment was scrubbed... > > ------------------------------ > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share > your > opinions on IT & business topics through brief surveys-and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > > ------------------------------ > > _______________________________________________ > Crf-users mailing list > Crf-users@... > https://lists.sourceforge.net/lists/listinfo/crf-users > > > End of Crf-users Digest, Vol 7, Issue 1 > *************************************** > ```

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