Document classification with ELMo

Although Word2vec gives a very elegant way of learning numerical representations of words, learning word representations alone is not convincing enough to realize the power of word vectors in real-world applications.

Word embeddings are used as the feature representation of words for many tasks, such as image caption generation and machine translation. However, these tasks involve combining different learning models such as Convolutional Neural Networks (CNNs) and Long Short-Term Memory (LSTM) models or two LSTM models (the CNN and LSTM models will be discussed in more detail in later chapters). To understand a real-world usage of word embeddings let’s stick to a simpler task—document classification.

Document classification is one of the most popular tasks in NLP. Document classification is extremely useful for anyone who is handling massive collections of data such as those for news websites, publishers, and universities. Therefore...