Why these odd numbers: we started with “fires” = at least 30% of the neuron's max and “silent” = under 5%, and later rewrote those as percentiles (top 3.1%, bottom 16.1%). Something more principled like 90/10 would be nicer; we haven't gotten around to it.
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About
Each photo is shown as the 224×224 crop the network actually sees. Cutoffs are percentiles of 4e:55's activation over all 1.33M ImageNet photos
(its value on a photo = its strongest response anywhere in the image). Default: ON = top 3.1% (at least 30% of its max), OFF = bottom 16.1% (under 5% of its max). Half the trials are ON photos and half OFF,
each drawn in proportion to how common they are in ImageNet; photos in between are never shown. After you answer you see the photo's percentile
and a heatmap (bright where it fires). Your history stays in this browser.
Methods, data and all experiments.