RICA exercise: what should "sane results" look like?

[ypeels]

Does anybody have an example of the "sane results" mentioned in runSoftICA.m? Looks like image captions aren't supported, so I'll limit things to one image per post for legibility... For completeness, here is my source code...

Here's what I am getting for the default parameter values (10000 patches).

[ypeels]

Default parameter values (10000 patches) but without "Step 3) Normalize each patch", instead just setting x = patches. The reason for doing this is given 2 posts below.

[ypeels]

200,000 patches + 32 filters (as in stlExercise.m) + normalization. Things look "over-regularized"...

[ypeels]

200,000 patches + 32 filters (as in stlExercise.m) + no normalization.

This was the only way I've found so far to obtain filters resembling the tutorial's (Step 2). I can get them to look somewhat more (qualitatively) like the tutorial's by tweaking lambda, but the result shown below is for default parameter values.

[ypeels]

An alternative? 200,000 patches + 32 filters + normalization + epsilon = 0.1 in zca2.m: