Re: [Kaldi-users] matrix archive format

[Daniel P. <dp...@gm...>]

It's actually trivial when you know how.
The text version of the archive format is just the utterance-id, then,
starting on the same line, the Matlab form of the matrix, then a newline.
 for instance

utt1 [ 0 2 3
1 3 4 ]
utt2 [ 9 8 7
6 4 2 ]
etc.

So just put them in a file foo and read them with ark:foo
You can then put them in binary format with an associated scp by doing

copy-feats ark:foo
ark,scp:/some/dir/my_features.ark,/some/dir/my_features.scp

and you can copy /some/dir/my_features.scp as data/<something>/feats.scp
and use them.

or as a pipe you can do

<matlab script> | copy-feats ark:-
ark,scp:/some/dir/my_features.ark,/some/dir/my_features.scp

Dan



On Thu, Mar 6, 2014 at 2:11 PM, Simon Klüpfel <sim...@gm...>wrote:

> Hi,
>
> A colleague of mine experimented with some 'exotic' feature vectors
> using Matlab, and now we would like to see how the pretty great Kaldi
> tools might be used to train some model using them.
>
> I believe, the clean way to do it, would be to write a routine that
> creates these features using the Kaldi libraries, and then writing them
> to an archive. However, I fear this will involve quite some work, and as
> we do not know if it will be an endeavor worth the effort, we would like
> to start off to export the features in a Kaldi readable format from
> Matlab. This so far seemed the smaller effort.
>
> I tried to find out about the way those files are structured, but got
> lost somewhere on the way.
>
> Looking into compute-mfcc-feats.cc, I saw that there is:
>
> BaseFloatMatrixWriter kaldi_writer;
>
> which is later used to write the archive:
>
> kaldi_writer.Write(utt, features);
>
> Trying to find what this call actually does, I got lost.
>
> I found this:
>
>
> http://kaldi.sourceforge.net/group__table__types.html#gaa9b0c000a2d8bbf1a7df386024110883
>
> and from there this:
>
> http://kaldi.sourceforge.net/table-types_8h_source.html#l00036
>
> and then eventually this:
>
> http://kaldi.sourceforge.net/classkaldi_1_1TableWriter.html
>
>
> I however could not yet find anything I could use to understand the
> particular format of the archive file of feature vectors.
>
> The scp file should be straightforward, but I hope someone of you could
> point me to the right resource to learn how to write the matrices of a
> set of features in the correct archive format.
>
> Perhaps doing a detour through non-binary files might be a way to get
> there, but this surely would be very unfavorable.
>
> Thanks a lot,
>
> Simon
>
>
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