Hi,It is a text format in which each line represents a labeled sparse feature vector using the following format:label index1:value1 index2:value2 ...This was the confusing part in the documentation: "where the indices are one-based and in ascending order. After loading, the feature indices are converted to zero-based." Let us say that I have 40 features so I create an index file like this: Feature, index number:F1 1F2 2F3 3...F4 40 I then create my feature vectors and in the libsvm format something like:1 10:1 20:0 8:1 4:0 24:11 1:1 40:0 2:1 8:0 9:1 23:10 23:1 18:0 13:1.....
I run regression and get back models.weights which are 40 weights.Say I get 0.110.34450.00005... In that case does the first weight (0.11) correspond to index 1/ F1 or does or correspond to index 2/F2? Since Input is 1-based and o/p is 0-based. Or is 0-based indexing is only for internal representation and what you get back at the end of regression is essentially 1-based indexed like your input so 0.11 maps onto from F1and so on? > Date: Mon, 22 Dec 2014 16:31:57 -0800 > Subject: Re: Interpreting MLLib's linear regression o/p > From: men...@gmail.com > To: ssti...@live.com > CC: user@spark.apache.org > > Did you check the indices in the LIBSVM data and the master file? Do > they match? -Xiangrui > > On Sat, Dec 20, 2014 at 8:13 AM, Sameer Tilak <ssti...@live.com> wrote: > > Hi All, > > I use LIBSVM format to specify my input feature vector, which used 1-based > > index. When I run regression the o/p is 0-indexed based. I have a master > > lookup file that maps back these indices to what they stand or. However, I > > need to add offset of 2 and not 1 to the regression outcome during the > > mapping. So for example to map the index of 800 from the regression output > > file, I look for 802 in my master lookup file and then things make sense. I > > can understand adding offset of 1, but not sure why adding offset 2 is > > working fine. Have others seem something like this as well? > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: user-unsubscr...@spark.apache.org > For additional commands, e-mail: user-h...@spark.apache.org >