Before revision:  A major concern in using CNNs is the problem of catastrophic URLetting when a model tries to learn new data. In spite of various recent proposed solutions to mitigate this problem, there still exist a few side-effects (such as time/computational complexity) of such solutions.
After revision:  A major concern in using CNNs is the problem of catastrophic URLetting when a model tries to learn a new task. Despite various proposed solutions to mitigate this problem, there still exist a few side-effects (such as time/computational complexity) of such solutions.