Microsoft COCO is a recent annotated database for object detection, segmentation, tagging, etc. It’s one order of magnitude larger than previous similar databases available. Here a comparison of sizes:
|Database||# classes||# Images||# Objects|
So when working with COCO, it’s typical to end up having to handle the 123.287 files of results. At some point you may want to move some of them, for instance, those that have a certain pattern in the name, such as val2014.
In a Linux environment and with mat files as results, you would typically do something like:
This worked flawlessly in Pascal, but in COCO you will get something like:
What’s the problem? The number of elements that the shell can handle in the arguments is limited, and we may be trying to move a larger number of files. Luckily, we can find a workaround by using
ls command lists all files and
grep filters the ones we want to move. Then, the list passes to
xargs, which executes the
mv command once per member of the list. The
-t option (Note that the
-t option works only on GNU systems) allows to exchange the order of the parameters of
mv. More info here.