We made exactly the same mistake in one of my projects on insect recognition. We photographed 54 classes of. Insects. Specimens had been collected, identified, and placed in vials. 1/

7:40 PM Β· Jul 26, 2019

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Vials were placed in boxes sorted by class. I hired student workers to photograph the specimens. Naturally they did this one box at a time; hence, one class at a time. 2/
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Photos were taken in alcohol. Bubbles would form in the alcohol. Different bubbles on different days. The learned classifier was surprisingly good. But a saliency map revealed that it was reading the bubble patterns and ignoring the specimens. 3/
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