Updating Neural Networks to Recognize New Categories, with Minimal Retraining : Alexa Blogs

Many of today's most popular AI systems are, at their core, classifiers. They classify inputs into different categories: this image is a picture of a dog, not a cat; this audio signal is an instance of the word "Boston", not the word "Seattle"; this sentence is a request to play a video, not a song. But what happens if you need to add a new class to your classifier -- if, say, someone releases a new type of automated household appliance that your smart-home system needs to be able to control? The traditional approach to updating a classifier is to acquire a lot of training data for the new class, add it to all the data used to train the classifier initially, and train a new classifier on the combined data set. With today's commercial AI systems, many of which were trained on millions of examples, this is a laborious process.