1. Ravi, K., Ravi, V.: A survey on opinion mining and sentiment analysis: tasks, approaches and applications. Knowl.-Based Syst. 89(C), 14–46 (2015)
2. Hechtlinger, Y.: Interpretation of prediction models using the input gradient. In: NIPS 2016 Workshop on Interpretable Machine Learning in Complex Systems (2016)
3. Bach, S., Binder, A., Montavon, G., Klauschen, F., Muller, K.R., Samek, W.: On pixel-wise explanations for nonlinear classifier decisions by layer-wise relevance propagation. PLoS ONE 10(7), 1–46 (2015)
4. Mikolov, T., Chen, K., Sutskever, I., Corrado, G., Dean, J.: Distributed representations of words and phrases and their compositionality. In: NIPS 2013, pp. 3111–3119 (2013)
5. Hornik, K., Feinerer, I., Kober, M., Buchta, C.: Spherical k-means clustering. J. Stat. Softw. 50(10), 1–22 (2012)