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ioam / topographica

A general-purpose neural simulator focusing on topographic maps.
topographica.org
BSD 3-Clause "New" or "Revised" License
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orientation preference always smaller than 1 #679

Closed kalok87 closed 6 years ago

kalok87 commented 6 years ago

Hallo, recently I ran gcal.ty in topographica (version 0.9.8-1), but surprisingly I found that the maximal value of op never exceeds 1. Is it a bug in that version of topographica?

Here it is how I record the orientation preference:

1) run the gcal.ty provided in the model file in GUI 2) use measure_or_pref() 3) run (mat1,bbox1)=topo.sim['V1'].sheet_views['OrientationPreference'].view() where mat1 is the matrix of op 4) then I use command numpy.max(mat1) to find the maximum 5) the maxima at t = 0, 1200, 9152 are 0.99, 0.9996, 0.9998, respectively.

The results at t = 9152 is shown in attachment. 009152 50_v1_orientation_preference

Does anyone also meet this problem in version 0.9.8-1, or just I have this situation...

jbednar commented 6 years ago

Like many quantities in Topographica, the orientation preference is defined as a magnitude, which explicitly ranges from 0.0 to 1.0. For orientation, 0 is horizontal, 0.5 is vertical, and approaching 1.0 returns to horizontal. You can convert the number to degrees by multiplying it by 180, or to radians by multiplying it by pi.