In terms of architectural style, Paris has got to be one of the most unified cities in the world, and even so there is a wide range of architecture possible, ranging from the classical Haussmanian apartment buildings, to Le Corbusier inspired art-deco. Whilst some of those styles are unique to Paris (the Haussmanian apartments in particular), many are fairly standard the world over, which means that unless you can see the street signs / parking metres / hous numbers / street lamps etc that are all uniquely parisian, you aren't going to be able to tell where a photo was taken. Still, it will be interesting to see if their software manages to pick up on things that I don't: maybe the width of sidewalks, or the hight of the first floor of an apartment building, or somthing along those lines can be used to distinguish cities, but I don't pay enough attention to see it.
I got 63%, I despaired at the end but I wouldn't have gone above 70% in any case (only went twice to Paris).
Edit2: they're not random? For example, for the 16th, 17th, 18th or 20th pictures, I can't make out if they're in Paris or not.
It would be interesting to see architectural or art history described using image recognition. It might lead to completely different classifications and also reveal influences that are different from the ones described by scholars.
Paris is a mish mash of styles that was pushed into the heavily predefined "Haussman" style which too many idiotic Parisians try to preserve. There are specific cues you can look for: building numbers, park meters, road signs, street lights, trees, post boxes, metro entrances, intersection styles, colors, window styles, roof styles, cars, doorways, construction, trash cans, lighting, street lamps, even the style of graffitis depending on the era.
I'm actually surprised I managed to get such a high score, but I think this test is skewed by having a default answer. I feel like a great majority of the photos presented are from Paris, too. And that seems like poor methodology since you can discover a certain coherence from the quantity.
I've been living outside of Paris for the last 3 years and the more I see images of it, the more I realize why foreigners think it's so special. It's just so different from anything else out there.
That said, I see almost as much conformity and repetition in Paris as I do in the cloned strip malls of suburban America.
They still use manpower to classify all those tracks which makes it very hard to scale.
I'm French and lived in Paris since 12 years (and 13 years in the suburb before that) and made... 95% percent! (well I think it helps to read French).
Anyway it's interesting, even for a French. So thanks.
EDIT: Just finished the test. 86%.