title: Fine-grained Analysis of Sentence Embeddings Using Auxiliary Prediction Tasks
abstract: There is a lot of research interest in encoding variable length sentences into fixed
  length vectors, in a way that preserves the sentence meanings. Two common
  methods include representations based on averaging word vectors, and representations based on the hidden states of recurrent neural networks such as LSTMs.
  The sentence vectors are used as features for subsequent machine learning tasks
  or for pre-training in the context of deep learning. However, not much is known
  about the properties that are encoded in these sentence representations and about
  the language information they capture.
  We propose a framework that facilitates better understanding of the encoded representations. We define prediction tasks around isolated aspects of sentence structure (namely sentence length, word content, and word order), and score representations by the ability to train a classifier to solve each prediction task when
  using the representation as input. We demonstrate the potential contribution of the
  approach by analyzing different sentence representation mechanisms. The analysis sheds light on the relative strengths of different sentence embedding methods with respect to these low level prediction tasks, and on the effect of the encoded
  vector’s dimensionality on the resulting representations.
authors: Yossi Adi Einat Kermany Yonatan Belinkov Ofer Lavi Yoav Goldberg
hIndex: Yoav Goldberg 47