Semi-supervised Learning of Compact Document Representations with Deep Networks
Description
Finding a good representation of text documents is crucial in document retrieval and classification systems. Nowadays, the most popular representation is simply based on a vector of counts storing the number of occurrences of each word in the document. This representation falls short in describing the dependence existing between similar words, and it cannot disambiguate phenomena like synonymy and polysemy of words. In this paper, we propose an algorithm to learn text document representations based on the recent advances in training deep networks. This technique can efficiently produce a very compact and informative representation of a document. Our experiments compare favorably this algorithm against similar algorithms but producing sparse and binary representations. Unlike other models, this method is trained by taking into account both an unsupervised and a supervised objective. We show that it is very advantageous to exploit even a few labeled samples during training, and that we can learn extremely compact representations by using deep and non-linear models.
| Slides | |
| 0:00 | Semi-supervised Learning of Compact Document Representations with Deep Networks |
| 0:43 | Synonymous queries give different results |
| 1:41 | Better Representations (1) |
| 2:33 | Better Representations (2) |
| 2:42 | Distributed Representations in information retrieval |
| 3:45 | Computational Efficiency |
| 4:19 | Exploit both labeled and unlabeled documents |
| 5:44 | Outline |
| 5:54 | Our model: Deep Semi-Supervised Encoder |
| 6:38 | Semi-supervised Greedy Learning (1) |
| 8:09 | Semi-supervised Greedy Learning (2) |
| 9:12 | Model: 1st stage (1) |
| 10:18 | Model: 1st stage (2) |
| 11:00 | Model: higher stages (1) |
| 11:23 | Model: higher stages (2) |
| 11:40 | Visualization of codes on Ohsumed corpus |
| 12:36 | Word neighbors in code space |
| 13:11 | Classification of partially labeled documents (1) |
| 14:01 | Classification of partially labeled documents (2) |
| 14:38 | Classification of partially labeled documents (3) |
| 15:11 | Deep vs Linear (LSI & TF-IDF) |
| 16:05 | Deep vs Shallow (1) |
| 16:36 | Deep vs Shallow (2) |
| 16:50 | Deep vs Shallow (3) |
| 16:55 | Deep vs Shallow (4) |
| 17:20 | Deep vs DBN vs SESM (1) |
| 17:34 | Deep vs DBN vs SESM (2) |
| 17:56 | Deep vs DBN vs SESM (3) |
| 18:05 | Deep vs DBN vs SESM (4) |
| 18:30 | Deep vs DBN vs SESM (5) |
| 19:01 | Vocabulary size |
| 19:33 | Summary |
| 20:18 | Perspectives |
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