Time to train a model matters for applications where you want to have end users training models on their own computers without spending so much CPU/GPU time that they have to plan their day around it.
Consider for instance an RSS reader that classifies articles to determine whether or not to interrupt the user with a notification. This should be fast to train and update the model on the fly every time the user enters a correction (e.g. 'this article actually isn't interesting', or 'interrupt me with articles like this in the future'.)
Consider for instance an RSS reader that classifies articles to determine whether or not to interrupt the user with a notification. This should be fast to train and update the model on the fly every time the user enters a correction (e.g. 'this article actually isn't interesting', or 'interrupt me with articles like this in the future'.)