Efficient max-margin Markov learning via conditional gradient and probabilistic inference
author:
Juho Rousu,
University of Helsinki
Description
We present a general and efficient optimisation methodology for for max-margin sructured classification tasks. The efficiency of the method relies on the interplay of several techiques: marginalization of the dual of the structured SVM, or max-margin Markov problem; partial decomposition via a gradient formulation; and finally tight coupling of a max-likelihood inference algorithm into the optimization algorithm, as opposed to using inference as a working set maintenance mechanism only.
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| Slides | |
| 0:02 | Efficient Max-Margin Markov |
| 0:33 | rStructured Multilabel Classication |
| 2:07 | Hypergraph structure? |
| 2:31 | Hierarchical Multilabel Classication: |
| 3:32 | Classication on a DAG: Gene ontology prediction |
| 4:51 | The classication model |
| 6:11 | Max-margin Structured output learning |
| 7:34 | Optimization problem |
| 8:58 | Decomposable representations |
| 10:25 | Orthogonal features |
| 12:34 | Orthogonal features |
| 13:44 | Additive features |
| 15:31 | Loss functions |
| 18:12 | Hierarchical losses |
| 20:23 | Optimization problem |
| 20:39 | Marginalized problem |
| 22:03 | Marginalized problem |
| 23:51 | Size of the marginal dual problem |
| 25:18 | Decomposing the model |
| 26:49 | Conditional Gradient method |
| 27:58 | Conditional Gradient Ascent |
| 28:11 | Conditional Gradient Ascent |
| 28:30 | Conditional Gradient Ascent |
| 28:40 | Conditional Gradient Ascent |
| 29:15 | Conditional Gradient Ascent |
| 29:20 | Decomposing the model |
| 30:48 | Finding update directions eciently |
| 31:32 | Finding update directions eciently |
| 33:04 | Finding update directions eciently |
| 34:17 | Solving the inference problem |
| 35:25 | Conditional Gradient Ascent |
| 35:45 | Solving the inference problem |
| 36:21 | Experiments |
| 37:44 | Optimization eciency |
| 38:40 | Prediction accuracy: Levelwise F1 |
| 41:17 | Scalability? |
| 42:39 | Conclusions |
| 44:11 | Future work and open problems |
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