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Posted to user@mahout.apache.org by Akshay Jain <ja...@gmail.com> on 2011/11/08 10:24:23 UTC
Collaborative filtering help needed
Hi.
Let me first say a BIG "THANKS" to the Mahout community and the authors of
the book "Mahout In Action". I have just started with Hadoop and Mahout and
am finding them extremely useful.
I am running the following code:
hadoop jar mahout-core-0.5-job.jar
org.apache.mahout.cf.taste.hadoop.item.RecommenderJob
-Dmapred.input.dir=input/input.txt -Dmapred.output.dir=output --userFile
input/users.txt --BooleanData
How do I specify that I want to get predictions for only specific items and
not the top 10 recommedations for the specified users in the "usersFile"
file?
I want to enter the file as following:
User1,Item23
User1,item344
User2,item12
user56,236
etc
and want to get results like:
User1,Item23,Predictd_Rating=4.5
User1,item344, Predictd_Rating=8
User2,item12, Predictd_Rating=1
user56,236, Predictd_Rating=2
etc
I can specify a "itemsFile" but that would not serve the purpose as I do
not want to specify a ItemsList from where to get the recommendations. I
want only one recommendation for the User*Item combination that I have to
be predicted.
Thank you.
Re: Collaborative filtering help needed
Posted by 张玉东 <zh...@vancl.cn>.
I think you have to modify the source code by incorporating some filters.
-----邮件原件-----
发件人: Akshay Jain [mailto:jakshay@gmail.com]
发送时间: 2011年11月8日 17:24
收件人: user@mahout.apache.org
主题: Collaborative filtering help needed
Hi.
Let me first say a BIG "THANKS" to the Mahout community and the authors of
the book "Mahout In Action". I have just started with Hadoop and Mahout and
am finding them extremely useful.
I am running the following code:
hadoop jar mahout-core-0.5-job.jar
org.apache.mahout.cf.taste.hadoop.item.RecommenderJob
-Dmapred.input.dir=input/input.txt -Dmapred.output.dir=output --userFile
input/users.txt --BooleanData
How do I specify that I want to get predictions for only specific items and
not the top 10 recommedations for the specified users in the "usersFile"
file?
I want to enter the file as following:
User1,Item23
User1,item344
User2,item12
user56,236
etc
and want to get results like:
User1,Item23,Predictd_Rating=4.5
User1,item344, Predictd_Rating=8
User2,item12, Predictd_Rating=1
user56,236, Predictd_Rating=2
etc
I can specify a "itemsFile" but that would not serve the purpose as I do
not want to specify a ItemsList from where to get the recommendations. I
want only one recommendation for the User*Item combination that I have to
be predicted.
Thank you.
Re: Collaborative filtering help needed
Posted by Sean Owen <sr...@gmail.com>.
Yes, of course, you've identified the method you want to call. Just
use it; Hadoop has nothing to do with this.
On Tue, Nov 15, 2011 at 8:50 AM, Akshay Jain <ja...@gmail.com> wrote:
> I want to specify user and some items corresponding to that user. Then I
> want to get a predicted rating for those items for that user.
>
> This is not possible using the fully distributed algorithm in mahout.My
> question was: can i use the pseudo distributed algo to do this? is there
> some built in function like Recommender.estimatePreference?
Re: Collaborative filtering help needed
Posted by Akshay Jain <ja...@gmail.com>.
I want to get the predicted rating predicted rating for users that I
specify for specific items (which will vary from user to user)
E.g.
User1 : I want to get predicted rating for Item_67
user1: i Want to get predicted rating for Item_23
user1: i Want to get predicted rating for Item_456
user2: i Want to get predicted rating for Item_12
user97: i Want to get predicted rating for Item_34
user97: i Want to get predicted rating for Item_11
user97: i Want to get predicted rating for Item_ 45
I want to specify user and some items corresponding to that user. Then I
want to get a predicted rating for those items for that user.
This is not possible using the fully distributed algorithm in mahout.My
question was: can i use the pseudo distributed algo to do this? is there
some built in function like Recommender.estimatePreference?
On Tue, Nov 15, 2011 at 4:42 PM, Sean Owen <sr...@gmail.com> wrote:
> Use what, your data? surely. You can run many instances of a
> non-disributed algorithms on Hadoop this way. It does not really lose
> performance. But you don't have to code anything either way. And
> unless you need to move to Hadoop at all, don't. I'm not sure what
> you're asking.
>
> On Tue, Nov 15, 2011 at 3:53 AM, Akshay Jain <ja...@gmail.com> wrote:
> > Is there any way I can use this through the Pseudo-distributed algo? I
> dont
> > mind loosing some performance if I dont have to code the entire thing
> > (which I do not know how to)
> >
> > On Wed, Nov 9, 2011 at 4:36 PM, Akshay Jain <ja...@gmail.com> wrote:
> >
> >> @Sean, I am just testing with a small dataset. I have some large
> datasets
> >> which I am planning to use on Hadoop.
> >>
> >> Thanks.
> >>
> >> Akshay
>
Re: Collaborative filtering help needed
Posted by Sean Owen <sr...@gmail.com>.
Use what, your data? surely. You can run many instances of a
non-disributed algorithms on Hadoop this way. It does not really lose
performance. But you don't have to code anything either way. And
unless you need to move to Hadoop at all, don't. I'm not sure what
you're asking.
On Tue, Nov 15, 2011 at 3:53 AM, Akshay Jain <ja...@gmail.com> wrote:
> Is there any way I can use this through the Pseudo-distributed algo? I dont
> mind loosing some performance if I dont have to code the entire thing
> (which I do not know how to)
>
> On Wed, Nov 9, 2011 at 4:36 PM, Akshay Jain <ja...@gmail.com> wrote:
>
>> @Sean, I am just testing with a small dataset. I have some large datasets
>> which I am planning to use on Hadoop.
>>
>> Thanks.
>>
>> Akshay
Re: Collaborative filtering help needed
Posted by Akshay Jain <ja...@gmail.com>.
Is there any way I can use this through the Pseudo-distributed algo? I dont
mind loosing some performance if I dont have to code the entire thing
(which I do not know how to)
On Wed, Nov 9, 2011 at 4:36 PM, Akshay Jain <ja...@gmail.com> wrote:
> @Sean, I am just testing with a small dataset. I have some large datasets
> which I am planning to use on Hadoop.
>
> Thanks.
>
> Akshay
>
> On Wed, Nov 9, 2011 at 12:49 PM, Sean Owen <sr...@gmail.com> wrote:
>
>> @Steven this is in the distributed part. There is no such method. But
>> Akshay if your data is not large, yeah, you could save a whole lot of
>> time and trouble by not using the Hadoop-based code.
>>
>> @Lance I am not sure there's any evidence he's running into a bug. I
>> don't know that the general "there may be bugs" comment is useful. I
>> do think it's good to use the latest in SVN.
>>
>> On Wed, Nov 9, 2011 at 5:28 AM, Akshay Jain <ja...@gmail.com> wrote:
>> > @Steven- Can you please tell me how to use
>> > Recommender.estimatePreference?
>> >
>> > @lance - Thanks for letting me know. I will update it to the latest
>> > version.
>> >
>> > Thanks
>> > Akshay
>>
>
>
Re: Collaborative filtering help needed
Posted by Akshay Jain <ja...@gmail.com>.
@Sean, I am just testing with a small dataset. I have some large datasets
which I am planning to use on Hadoop.
Thanks.
Akshay
On Wed, Nov 9, 2011 at 12:49 PM, Sean Owen <sr...@gmail.com> wrote:
> @Steven this is in the distributed part. There is no such method. But
> Akshay if your data is not large, yeah, you could save a whole lot of
> time and trouble by not using the Hadoop-based code.
>
> @Lance I am not sure there's any evidence he's running into a bug. I
> don't know that the general "there may be bugs" comment is useful. I
> do think it's good to use the latest in SVN.
>
> On Wed, Nov 9, 2011 at 5:28 AM, Akshay Jain <ja...@gmail.com> wrote:
> > @Steven- Can you please tell me how to use
> > Recommender.estimatePreference?
> >
> > @lance - Thanks for letting me know. I will update it to the latest
> > version.
> >
> > Thanks
> > Akshay
>
Re: Collaborative filtering help needed
Posted by Sean Owen <sr...@gmail.com>.
@Steven this is in the distributed part. There is no such method. But
Akshay if your data is not large, yeah, you could save a whole lot of
time and trouble by not using the Hadoop-based code.
@Lance I am not sure there's any evidence he's running into a bug. I
don't know that the general "there may be bugs" comment is useful. I
do think it's good to use the latest in SVN.
On Wed, Nov 9, 2011 at 5:28 AM, Akshay Jain <ja...@gmail.com> wrote:
> @Steven- Can you please tell me how to use
> Recommender.estimatePreference?
>
> @lance - Thanks for letting me know. I will update it to the latest
> version.
>
> Thanks
> Akshay
Re: Collaborative filtering help needed
Posted by Akshay Jain <ja...@gmail.com>.
@Steven- Can you please tell me how to use
Recommender.estimatePreference?
@lance - Thanks for letting me know. I will update it to the latest
version.
Thanks
Akshay
On Wed, Nov 9, 2011 at 5:51 AM, Steven Bourke <sb...@gmail.com> wrote:
> Should you not be using Recommender.estimatePreference?
>
> On Wed, Nov 9, 2011 at 12:19 AM, Lance Norskog <go...@gmail.com> wrote:
>
> > Akshay-
> >
> > The Mahout 0.5 release has bugs. We advise everyone to use the Mahout 0.6
> > trunk.
> >
> > Lance
> >
> > On Tue, Nov 8, 2011 at 2:53 AM, Akshay Jain <ja...@gmail.com> wrote:
> >
> > > Yes. I want to predict ratings for new things which the user has not
> > rated
> > > yet.
> > >
> > > On Tue, Nov 8, 2011 at 4:00 PM, Sean Owen <sr...@gmail.com> wrote:
> > >
> > > > OK, for that, you'd have to modify the code.
> > > >
> > > > You are not talking about getting ratings for the ratings you already
> > > know
> > > > right? so, user 1 does not already express any rating for item 67 in
> > your
> > > > example.
> > > >
> > > > On Tue, Nov 8, 2011 at 10:05 AM, Akshay Jain <ja...@gmail.com>
> > wrote:
> > > >
> > > > > Sorry for the bad english.
> > > > >
> > > > > I want to get the predicted rating predicted rating for users that
> I
> > > > > specify for specific items (which will vary from user to user)
> > > > >
> > > > > E.g.
> > > > >
> > > > > User1 : I want to get predicted rating for Item_67
> > > > > user1: i Want to get predicted rating for Item_23
> > > > > user1: i Want to get predicted rating for Item_456
> > > > >
> > > > > user2: i Want to get predicted rating for Item_12
> > > > >
> > > > > user97: i Want to get predicted rating for Item_34
> > > > > user97: i Want to get predicted rating for Item_11
> > > > > user97: i Want to get predicted rating for Item_ 45
> > > > >
> > > > >
> > > > > I want to specify user and some items corresponding to that user.
> > Then
> > > I
> > > > > want to get a predicted rating for those items for that user.
> > > > >
> > > > > I hope I was able to clarify it.
> > > > >
> > > > >
> > > >
> > >
> >
> >
> >
> > --
> > Lance Norskog
> > goksron@gmail.com
> >
>
Re: Collaborative filtering help needed
Posted by Steven Bourke <sb...@gmail.com>.
Should you not be using Recommender.estimatePreference?
On Wed, Nov 9, 2011 at 12:19 AM, Lance Norskog <go...@gmail.com> wrote:
> Akshay-
>
> The Mahout 0.5 release has bugs. We advise everyone to use the Mahout 0.6
> trunk.
>
> Lance
>
> On Tue, Nov 8, 2011 at 2:53 AM, Akshay Jain <ja...@gmail.com> wrote:
>
> > Yes. I want to predict ratings for new things which the user has not
> rated
> > yet.
> >
> > On Tue, Nov 8, 2011 at 4:00 PM, Sean Owen <sr...@gmail.com> wrote:
> >
> > > OK, for that, you'd have to modify the code.
> > >
> > > You are not talking about getting ratings for the ratings you already
> > know
> > > right? so, user 1 does not already express any rating for item 67 in
> your
> > > example.
> > >
> > > On Tue, Nov 8, 2011 at 10:05 AM, Akshay Jain <ja...@gmail.com>
> wrote:
> > >
> > > > Sorry for the bad english.
> > > >
> > > > I want to get the predicted rating predicted rating for users that I
> > > > specify for specific items (which will vary from user to user)
> > > >
> > > > E.g.
> > > >
> > > > User1 : I want to get predicted rating for Item_67
> > > > user1: i Want to get predicted rating for Item_23
> > > > user1: i Want to get predicted rating for Item_456
> > > >
> > > > user2: i Want to get predicted rating for Item_12
> > > >
> > > > user97: i Want to get predicted rating for Item_34
> > > > user97: i Want to get predicted rating for Item_11
> > > > user97: i Want to get predicted rating for Item_ 45
> > > >
> > > >
> > > > I want to specify user and some items corresponding to that user.
> Then
> > I
> > > > want to get a predicted rating for those items for that user.
> > > >
> > > > I hope I was able to clarify it.
> > > >
> > > >
> > >
> >
>
>
>
> --
> Lance Norskog
> goksron@gmail.com
>
Re: Collaborative filtering help needed
Posted by Lance Norskog <go...@gmail.com>.
Akshay-
The Mahout 0.5 release has bugs. We advise everyone to use the Mahout 0.6
trunk.
Lance
On Tue, Nov 8, 2011 at 2:53 AM, Akshay Jain <ja...@gmail.com> wrote:
> Yes. I want to predict ratings for new things which the user has not rated
> yet.
>
> On Tue, Nov 8, 2011 at 4:00 PM, Sean Owen <sr...@gmail.com> wrote:
>
> > OK, for that, you'd have to modify the code.
> >
> > You are not talking about getting ratings for the ratings you already
> know
> > right? so, user 1 does not already express any rating for item 67 in your
> > example.
> >
> > On Tue, Nov 8, 2011 at 10:05 AM, Akshay Jain <ja...@gmail.com> wrote:
> >
> > > Sorry for the bad english.
> > >
> > > I want to get the predicted rating predicted rating for users that I
> > > specify for specific items (which will vary from user to user)
> > >
> > > E.g.
> > >
> > > User1 : I want to get predicted rating for Item_67
> > > user1: i Want to get predicted rating for Item_23
> > > user1: i Want to get predicted rating for Item_456
> > >
> > > user2: i Want to get predicted rating for Item_12
> > >
> > > user97: i Want to get predicted rating for Item_34
> > > user97: i Want to get predicted rating for Item_11
> > > user97: i Want to get predicted rating for Item_ 45
> > >
> > >
> > > I want to specify user and some items corresponding to that user. Then
> I
> > > want to get a predicted rating for those items for that user.
> > >
> > > I hope I was able to clarify it.
> > >
> > >
> >
>
--
Lance Norskog
goksron@gmail.com
Re: Collaborative filtering help needed
Posted by Akshay Jain <ja...@gmail.com>.
Yes. I want to predict ratings for new things which the user has not rated
yet.
On Tue, Nov 8, 2011 at 4:00 PM, Sean Owen <sr...@gmail.com> wrote:
> OK, for that, you'd have to modify the code.
>
> You are not talking about getting ratings for the ratings you already know
> right? so, user 1 does not already express any rating for item 67 in your
> example.
>
> On Tue, Nov 8, 2011 at 10:05 AM, Akshay Jain <ja...@gmail.com> wrote:
>
> > Sorry for the bad english.
> >
> > I want to get the predicted rating predicted rating for users that I
> > specify for specific items (which will vary from user to user)
> >
> > E.g.
> >
> > User1 : I want to get predicted rating for Item_67
> > user1: i Want to get predicted rating for Item_23
> > user1: i Want to get predicted rating for Item_456
> >
> > user2: i Want to get predicted rating for Item_12
> >
> > user97: i Want to get predicted rating for Item_34
> > user97: i Want to get predicted rating for Item_11
> > user97: i Want to get predicted rating for Item_ 45
> >
> >
> > I want to specify user and some items corresponding to that user. Then I
> > want to get a predicted rating for those items for that user.
> >
> > I hope I was able to clarify it.
> >
> >
>
Re: Collaborative filtering help needed
Posted by Sean Owen <sr...@gmail.com>.
OK, for that, you'd have to modify the code.
You are not talking about getting ratings for the ratings you already know
right? so, user 1 does not already express any rating for item 67 in your
example.
On Tue, Nov 8, 2011 at 10:05 AM, Akshay Jain <ja...@gmail.com> wrote:
> Sorry for the bad english.
>
> I want to get the predicted rating predicted rating for users that I
> specify for specific items (which will vary from user to user)
>
> E.g.
>
> User1 : I want to get predicted rating for Item_67
> user1: i Want to get predicted rating for Item_23
> user1: i Want to get predicted rating for Item_456
>
> user2: i Want to get predicted rating for Item_12
>
> user97: i Want to get predicted rating for Item_34
> user97: i Want to get predicted rating for Item_11
> user97: i Want to get predicted rating for Item_ 45
>
>
> I want to specify user and some items corresponding to that user. Then I
> want to get a predicted rating for those items for that user.
>
> I hope I was able to clarify it.
>
>
Re: Collaborative filtering help needed
Posted by Akshay Jain <ja...@gmail.com>.
Sorry for the bad english.
I want to get the predicted rating predicted rating for users that I
specify for specific items (which will vary from user to user)
E.g.
User1 : I want to get predicted rating for Item_67
user1: i Want to get predicted rating for Item_23
user1: i Want to get predicted rating for Item_456
user2: i Want to get predicted rating for Item_12
user97: i Want to get predicted rating for Item_34
user97: i Want to get predicted rating for Item_11
user97: i Want to get predicted rating for Item_ 45
I want to specify user and some items corresponding to that user. Then I
want to get a predicted rating for those items for that user.
I hope I was able to clarify it.
On Tue, Nov 8, 2011 at 3:25 PM, 张玉东 <zh...@vancl.cn> wrote:
> I think he means that he want to get an estimated score for specific item
> corresponding to each user, thus the item is not scored by the user.
>
> -----邮件原件-----
> 发件人: Sean Owen [mailto:srowen@gmail.com]
> 发送时间: 2011年11月8日 17:52
> 收件人: user@mahout.apache.org
> 主题: Re: Collaborative filtering help needed
>
> I'm not sure what you are asking then. Taking your first email literally it
> sounds like you want to estimate the ratings you already know! Do you want
> 1 rec per user?
> On Nov 8, 2011 9:47 AM, "Akshay Jain" <ja...@gmail.com> wrote:
>
> > Sean, that can be done, but I don't want to get the same item's
> prediction
> > for all the users. Is there no other way than to manually code it? (I
> dont
> > know java, so I dont think that would be possible for me :( )
> >
> > On Tue, Nov 8, 2011 at 3:02 PM, Sean Owen <sr...@gmail.com> wrote:
> >
> > > I think specifying an item file with one item does it? You should get
> one
> > > rec for most users that is that item.
> > > On Nov 8, 2011 9:25 AM, "Akshay Jain" <ja...@gmail.com> wrote:
> > >
> > > > Hi.
> > > >
> > > > Let me first say a BIG "THANKS" to the Mahout community and the
> authors
> > > of
> > > > the book "Mahout In Action". I have just started with Hadoop and
> Mahout
> > > and
> > > > am finding them extremely useful.
> > > >
> > > > I am running the following code:
> > > > hadoop jar mahout-core-0.5-job.jar
> > > > org.apache.mahout.cf.taste.hadoop.item.RecommenderJob
> > > > -Dmapred.input.dir=input/input.txt -Dmapred.output.dir=output
> > --userFile
> > > > input/users.txt --BooleanData
> > > >
> > > > How do I specify that I want to get predictions for only specific
> items
> > > and
> > > > not the top 10 recommedations for the specified users in the
> > "usersFile"
> > > > file?
> > > > I want to enter the file as following:
> > > > User1,Item23
> > > > User1,item344
> > > > User2,item12
> > > > user56,236
> > > > etc
> > > > and want to get results like:
> > > > User1,Item23,Predictd_Rating=4.5
> > > > User1,item344, Predictd_Rating=8
> > > > User2,item12, Predictd_Rating=1
> > > > user56,236, Predictd_Rating=2
> > > > etc
> > > >
> > > > I can specify a "itemsFile" but that would not serve the purpose as I
> > do
> > > > not want to specify a ItemsList from where to get the
> recommendations.
> > I
> > > > want only one recommendation for the User*Item combination that I
> have
> > to
> > > > be predicted.
> > > >
> > > > Thank you.
> > > >
> > >
> >
>
Re: Collaborative filtering help needed
Posted by 张玉东 <zh...@vancl.cn>.
I think he means that he want to get an estimated score for specific item corresponding to each user, thus the item is not scored by the user.
-----邮件原件-----
发件人: Sean Owen [mailto:srowen@gmail.com]
发送时间: 2011年11月8日 17:52
收件人: user@mahout.apache.org
主题: Re: Collaborative filtering help needed
I'm not sure what you are asking then. Taking your first email literally it
sounds like you want to estimate the ratings you already know! Do you want
1 rec per user?
On Nov 8, 2011 9:47 AM, "Akshay Jain" <ja...@gmail.com> wrote:
> Sean, that can be done, but I don't want to get the same item's prediction
> for all the users. Is there no other way than to manually code it? (I dont
> know java, so I dont think that would be possible for me :( )
>
> On Tue, Nov 8, 2011 at 3:02 PM, Sean Owen <sr...@gmail.com> wrote:
>
> > I think specifying an item file with one item does it? You should get one
> > rec for most users that is that item.
> > On Nov 8, 2011 9:25 AM, "Akshay Jain" <ja...@gmail.com> wrote:
> >
> > > Hi.
> > >
> > > Let me first say a BIG "THANKS" to the Mahout community and the authors
> > of
> > > the book "Mahout In Action". I have just started with Hadoop and Mahout
> > and
> > > am finding them extremely useful.
> > >
> > > I am running the following code:
> > > hadoop jar mahout-core-0.5-job.jar
> > > org.apache.mahout.cf.taste.hadoop.item.RecommenderJob
> > > -Dmapred.input.dir=input/input.txt -Dmapred.output.dir=output
> --userFile
> > > input/users.txt --BooleanData
> > >
> > > How do I specify that I want to get predictions for only specific items
> > and
> > > not the top 10 recommedations for the specified users in the
> "usersFile"
> > > file?
> > > I want to enter the file as following:
> > > User1,Item23
> > > User1,item344
> > > User2,item12
> > > user56,236
> > > etc
> > > and want to get results like:
> > > User1,Item23,Predictd_Rating=4.5
> > > User1,item344, Predictd_Rating=8
> > > User2,item12, Predictd_Rating=1
> > > user56,236, Predictd_Rating=2
> > > etc
> > >
> > > I can specify a "itemsFile" but that would not serve the purpose as I
> do
> > > not want to specify a ItemsList from where to get the recommendations.
> I
> > > want only one recommendation for the User*Item combination that I have
> to
> > > be predicted.
> > >
> > > Thank you.
> > >
> >
>
Re: Collaborative filtering help needed
Posted by Sean Owen <sr...@gmail.com>.
I'm not sure what you are asking then. Taking your first email literally it
sounds like you want to estimate the ratings you already know! Do you want
1 rec per user?
On Nov 8, 2011 9:47 AM, "Akshay Jain" <ja...@gmail.com> wrote:
> Sean, that can be done, but I don't want to get the same item's prediction
> for all the users. Is there no other way than to manually code it? (I dont
> know java, so I dont think that would be possible for me :( )
>
> On Tue, Nov 8, 2011 at 3:02 PM, Sean Owen <sr...@gmail.com> wrote:
>
> > I think specifying an item file with one item does it? You should get one
> > rec for most users that is that item.
> > On Nov 8, 2011 9:25 AM, "Akshay Jain" <ja...@gmail.com> wrote:
> >
> > > Hi.
> > >
> > > Let me first say a BIG "THANKS" to the Mahout community and the authors
> > of
> > > the book "Mahout In Action". I have just started with Hadoop and Mahout
> > and
> > > am finding them extremely useful.
> > >
> > > I am running the following code:
> > > hadoop jar mahout-core-0.5-job.jar
> > > org.apache.mahout.cf.taste.hadoop.item.RecommenderJob
> > > -Dmapred.input.dir=input/input.txt -Dmapred.output.dir=output
> --userFile
> > > input/users.txt --BooleanData
> > >
> > > How do I specify that I want to get predictions for only specific items
> > and
> > > not the top 10 recommedations for the specified users in the
> "usersFile"
> > > file?
> > > I want to enter the file as following:
> > > User1,Item23
> > > User1,item344
> > > User2,item12
> > > user56,236
> > > etc
> > > and want to get results like:
> > > User1,Item23,Predictd_Rating=4.5
> > > User1,item344, Predictd_Rating=8
> > > User2,item12, Predictd_Rating=1
> > > user56,236, Predictd_Rating=2
> > > etc
> > >
> > > I can specify a "itemsFile" but that would not serve the purpose as I
> do
> > > not want to specify a ItemsList from where to get the recommendations.
> I
> > > want only one recommendation for the User*Item combination that I have
> to
> > > be predicted.
> > >
> > > Thank you.
> > >
> >
>
Re: Collaborative filtering help needed
Posted by Akshay Jain <ja...@gmail.com>.
Sean, that can be done, but I don't want to get the same item's prediction
for all the users. Is there no other way than to manually code it? (I dont
know java, so I dont think that would be possible for me :( )
On Tue, Nov 8, 2011 at 3:02 PM, Sean Owen <sr...@gmail.com> wrote:
> I think specifying an item file with one item does it? You should get one
> rec for most users that is that item.
> On Nov 8, 2011 9:25 AM, "Akshay Jain" <ja...@gmail.com> wrote:
>
> > Hi.
> >
> > Let me first say a BIG "THANKS" to the Mahout community and the authors
> of
> > the book "Mahout In Action". I have just started with Hadoop and Mahout
> and
> > am finding them extremely useful.
> >
> > I am running the following code:
> > hadoop jar mahout-core-0.5-job.jar
> > org.apache.mahout.cf.taste.hadoop.item.RecommenderJob
> > -Dmapred.input.dir=input/input.txt -Dmapred.output.dir=output --userFile
> > input/users.txt --BooleanData
> >
> > How do I specify that I want to get predictions for only specific items
> and
> > not the top 10 recommedations for the specified users in the "usersFile"
> > file?
> > I want to enter the file as following:
> > User1,Item23
> > User1,item344
> > User2,item12
> > user56,236
> > etc
> > and want to get results like:
> > User1,Item23,Predictd_Rating=4.5
> > User1,item344, Predictd_Rating=8
> > User2,item12, Predictd_Rating=1
> > user56,236, Predictd_Rating=2
> > etc
> >
> > I can specify a "itemsFile" but that would not serve the purpose as I do
> > not want to specify a ItemsList from where to get the recommendations. I
> > want only one recommendation for the User*Item combination that I have to
> > be predicted.
> >
> > Thank you.
> >
>
Re: Collaborative filtering help needed
Posted by Sean Owen <sr...@gmail.com>.
I think specifying an item file with one item does it? You should get one
rec for most users that is that item.
On Nov 8, 2011 9:25 AM, "Akshay Jain" <ja...@gmail.com> wrote:
> Hi.
>
> Let me first say a BIG "THANKS" to the Mahout community and the authors of
> the book "Mahout In Action". I have just started with Hadoop and Mahout and
> am finding them extremely useful.
>
> I am running the following code:
> hadoop jar mahout-core-0.5-job.jar
> org.apache.mahout.cf.taste.hadoop.item.RecommenderJob
> -Dmapred.input.dir=input/input.txt -Dmapred.output.dir=output --userFile
> input/users.txt --BooleanData
>
> How do I specify that I want to get predictions for only specific items and
> not the top 10 recommedations for the specified users in the "usersFile"
> file?
> I want to enter the file as following:
> User1,Item23
> User1,item344
> User2,item12
> user56,236
> etc
> and want to get results like:
> User1,Item23,Predictd_Rating=4.5
> User1,item344, Predictd_Rating=8
> User2,item12, Predictd_Rating=1
> user56,236, Predictd_Rating=2
> etc
>
> I can specify a "itemsFile" but that would not serve the purpose as I do
> not want to specify a ItemsList from where to get the recommendations. I
> want only one recommendation for the User*Item combination that I have to
> be predicted.
>
> Thank you.
>