In the first post, I discussed different ideas of what sensitivity could mean. In the second post, I discussed how tradeoffs in sensitivity were used as the basis for the "zones" software feature, allowing for a "trusted", "neutral", and "untrusted" zone.
In this final post on the initial introduction of sensitivity, I'd like to discuss one more feature: automatic zone selection.
The idea is simple: if the plugin sees that a number of images were recently getting blocked, it might be a good idea to try to move to a less trusted zone because it might mean we're letting too many bad ones through; similarly, if we haven't blocked many images in a while, it might be a good idea to realize we are likely in a more trusted zone and would be better off not blocking extra good ones.
So for example, suppose you are browsing sites you know and love and that don't have any questionable content. However, suppose you then get linked off to a bit more questionable site - but not objectionable enough that it makes sense to leave. In this situation, it would be fabulous if the plugin just started being a bit more picky. With automatic mode, the switch can happen automatically.
For the stats-minded folks out there, internally the number of predicted positives is multiplied by the precision to get an estimator of the number of true positives. The estimated true positives - as a percentage - controls which zone is selected.
For the first release I plan to make automatic mode the default, but the different zones can be selected as well - which will turn off automatic mode.
And that's it for the introduction on sensitivity - I'm quite excited about getting this feature out! I'm looking forward to getting feedback on how well it is working for everyone.
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