[Work Log] Work Log - fitting progress

January 18, 2015
Project FIRE
Subproject Piecewise Linear Clustering (tests)
Working path projects/​fire/​trunk/​src/​piecewise_linear/​test
SVN Revision unknown (see text)
Unless otherwise noted, all filesystem paths are relative to the "Working path" named above.

Implemented a image-pyramid-based likelihood and results are much better! Also relaxed the prior, which appears to be overfit.

Run 1:

After first pass, the global maximum seemed to have been found. The second pass quickly refined it.

This wasn't happening with the prior I trained, which suggests overfitting.

Possible changes to consider

Try using fewer eigenvectors.

Use likelihood mixture rather than product. Should be smoother and allow more non-optimal results.

Consider scaling by inverse of eigenvector dynamic range, so moving by 1 guarantees at least one pixel changing.

Consider using hyperpriors during training.

Train cubic spline covariance model.

Next steps

Posted by Kyle Simek
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