annotate yeti/silvet.yeti @ 14:a91de434feb8

More (sometimes baffled) annotations and a bit of work on the EM

program silvet;

{ prepareTimeFrequency } = load timefreq;
{ loadTemplates, extractRanges } = load templates;

em = load em;

mat = load may.matrix;
vec = load may.vector;
plot = load may.plot;

templates = loadTemplates ();

ranges = extractRanges templates;

eprintln "\nWe have \(length (keys templates)) instruments:";
for (sort (keys templates)) do k:
    eprintln " * \(k) \(mat.size templates[k]) range \(ranges[k].lowest) -> \(ranges[k].highest)";
done;
eprintln "";

columns = prepareTimeFrequency "test.wav";

height = if empty? columns then 0 else vec.length (head columns) fi;

chunkSize = { rows = height, columns = 100 };

emdata = em.initialise ranges templates 88 chunkSize;

eprintln "initialised EM data: overall pitch range \(emdata.lowest) -> \(emdata.highest)";

chunkify cols = 
    if empty? cols then []
    else
       (mat.resizedTo chunkSize
           (mat.fromColumns (take chunkSize.columns cols)))
        :. \(chunkify (drop chunkSize.columns cols));
    fi;

chunks = chunkify columns;

eprintln "we have \(length chunks) chunks of size \(mat.size (head chunks))";

eprintln "attempting one expectation phase...";

error = em.performExpectation emdata (head chunks);

eprintln "done, result has dimension \(mat.size error)";

eprintln "attempting one maximisation phase...";

newP = em.performMaximisation emdata (head chunks) error;

eprintln "done";

\() (plot.plot [ Grid (head chunks) ]);
\() (plot.plot [ Grid error ]);

\() (plot.plot [ Grid newP ]);

();