in ssvd specifically, the sequence file keys if the input matrix can actually be any WritableComparable, even duplicates are admissible but in practice you do want them to be unique to identify them in the U-related result matrices. internally rows are identified by their position in the input i.e. their split and the ordinal row index inside the split. On Nov 22, 2012 6:16 AM, "Sebastian Schelter" <[email protected]> wrote:
> Hi, > > the sequencefile must consist of <IntWritable,VectorWritable> pairs, > where the key represents the row number and the value holds the row vector. > > Best, > Sebastian > > > On 22.11.2012 15:13, Chui-Hui Chiu wrote: > > Hello, all, > > > > I read the introduction page of the SVD in Mahout. The SVD application > > requires that the input matrix in the Sequence File Format. Now, I have > a > > matrix with real number elements in the ASCII format. Rows are separated > > by the new line characters and columns are separated by the space > > character. The matrix looks like > > > > 1.1 1.2 1.3 > > 2.1 2.2 2.3 > > 3.1 3.2 3.3 > > > > How is the matrix stored in Sequence Files? How do I convert the matrix > > into the appropriate format for the SVD application? > > > > > > Thanks, > > Chiu > > > >
