> The entire concept of being "reminded" of something is pretty foreign to how binary computers compute... They either have or don't have information. They don't struggle to remember and occasionally recall things, and/or realize they used to know them when reminded.
How about a database with a link to an image file that has been moved to "tape backup"? If you have the md5 of the image you know that you have seen it, you just cant access it at this time. The way best way to describe how a rcnn deals with images is: "this looks familiar, i'm 73.2398798% confident that I have seen this image before and it was a dog..."
Here is a way to simulate a computer forgetting information when it comes to images: start with an photo on day one and on subsequent days start shrinking the image. By the time you get to a 150px thumbnail most of the information is gone, you will not be able to tell anything about the details of the photo BUT you will know that this photo was beautiful landscape or whatever.