Conventional text classification models make a bag-of-words assumption reducing text, fundamentally a sequence of words, into word occurrence counts per document. Recent algorithms such as word2vec and fastText are capable of learning semantic meaning and similarity between words in an entirely unsupervised manner using a contextual window and doing so much faster than previous methods. Each word is represented as a vector such that similar meaning words such as 'strong' and 'powerful' are in the same general Euclidian space. Open questions about these embeddings include their usefulness across classification tasks and the optimal set of documents to build the embeddings. In this work, we demonstrate the usefulness of embeddings for improving the state of the art in classification for our tasks and demonstrate that specific word embeddings built in the domain and for the tasks can improve performance over general word embeddings (learnt on news articles, Wikipedia or PubMed).

本文探讨使用无监督学习的方法，通过单词嵌入在词向量空间内学习语义相似性，以实现对文本分类任务的性能优化。研究发现，使用领域特定的词嵌入可以提高分类性能。

使用通用和特定词嵌入来分类研究的翻译阶段