NLP Classification with Universal Language Model Fine-tuning (ULMFiT)

Text classification is one of the important applications of NLP. Applications such as Sentiment Analysis and Identifying spam, bots, and offensive comments come under Text Classification. Until now, the approaches used for solving these problems included building Machine Learning or Deep Learning models from scratch, training them on your text data, and fine-tuning it with hyperparameters. Even though such models give decent results for applications like classifying whether a movie review is positive or negative, they may perform terribly if things become more ambiguous because most of the time there's just not enough amount of labeled data to learn from. Isn't the Imagenet using the same approach to classify the images?