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| Any chosen (not overlycomplex) architecture | * | Mapping can be well approximated by functions from the chosen familywhich are easily accessible by optimization. |
| Small network | * | Mapping is simple (complexity of the mapping depends on the number ofnetwork units and layers). |
| Deep network | * | The mapping is complex,but can be decomposed into a composition (orgenerally into a directed acyclic graph) of simple nonlinear transformations,e.g.affine transformation followed by simple nonlinearity(fully-connectedlayer),“multi-channel convolution”followed by simple nonlinearity (convo-lutional layer),etc. |
| Hard bottleneck (layer withfew neurons);soft bottleneck(e.g.Jacobian penalty (Rifaiet al.,201lc),see Section 6) | Layer operation | Data concentrates around a lower-dimensional manifold; has few factors ofvariation. |
| Convolutional networks(Fukushima and Miyake,1982;Rumelhart et al.,1986,Pp.348-352; LeCun et al.,1989;Simard et al., 2003) | Layer operation | Spatially local and shift-equivariant feature extraction is all we need. |
| Dilated convolutions(Yu and Koltun,2015) | Layer operation | Like convolutional networks.Additionally:Sparse sampling of wide localneighborhoods provides relevant information,and better preserves rele-vant high-resolution information than architectures with downscaling andupsampling. |
| Strided convolutions (seeDumoulin and Visin,2016) | Layer operation | The mapping is reliable at reacting to features that do not vary tooabruptly in space,i.e.which are present in several neighboring pixels andcan be detected even if the filter center skips some of the pixels.The out-put is robust towards slight changes of the location of features,and changesof strength/presence of spatially strongly varying features. |
| Pooling | Layer operation | The output is invariant to slight spatial distortions of the input (slightchanges of the location of (deep) features).Features that are sensitive tosuch distortions can be discarded. |
| Stochastic pooling(Zeiler and Fergus,2013) | Layer operation | The output is robust towards slight changes of the location (like pooling)but also of the strength/presence of (deep) features. |
| Training with different kindsof noise (including Dropout;see Section 3) | Noise | The mapping is robust to noise:the given class of perturbations of theinput or deep features should not affect the output too much. |
| Dropout (Hinton et al., 2012;Srivastava etal.,2014),DropConnect (Wan et al.,2013),and related methods | Noise | Extracting complementary (non-coadapted) features is helpful.Non-coadapted features are more informative,better disentangle factors of vari-ation.(We want to disentangle factors of variation because they are en-tangled in different ways in inputs vs.in outputs.)When interpreted as ensemble learning:usual assumptions of ensemblelearning (predictions of weak learners have complementary info and can becombined to strong prediction). |
| Maxout units(Goodfellow et al., 2013) | Layer operation | Assumptions similar to Dropout,with more accurate approximation ofmodel averaging (when interpreted as ensemble learning) |
| Skip-connections (Long et al.,2015;Huang et al.,2016a) | Connections be-tween layers | Certain lower-level features can directly be reused in a meaningful way at(several) higher levels of abstraction |
| Linearly augmentedfeed-forward network (van derSmagt and Hirzinger,1998) | Connections be-tween layers | Skip-connections that share weights with the non-skip-connections.Helpsagainst vanishing gradients. Rather changes the learning algorithm thanthe network mapping. |
| Residual learning(He et al., 2016) | Connections be-tween layers | Learning additive difference of a mapping f (or its compositional parts)from the identity mapping is easier than learning f itself. Meaningful deepfeatures can be composed asa sum of lower-level and intermediate-levelfeatures. |
| Stochastic depth(Huang et al.,2016b),DropIn(Smith et al., 2015) | Connectionsbetween layers;noise | Similar to Dropout:extracting complementary (non-coadapted) featuresacross different levels of abstraction is helpful; implicit model ensem-ble.Similar to Residual learning: meaningful deep features can be com-posed as a sum of lower-level and intermediate-level features,with theintermediate-level ones being optional,and leaving them out beingmeaningful data augmentation. Similar to Mollifying networks: simpli-fying random parts of the mapping improves training. |
| Mollifying networks(Gülcehre et al., 2016b) | Connectionsbetweenlayers;noise | The mapping can be easier approximated by estimating its decreasinglylinear simplified version |
| Network information criterion(Murata et al.,1994),Networkgrowing and network pruning(see Bishop,1995a, Sec. 9.5) | Model selection | Optimal generalization is reached by a network that has the right numberof units (not too few,not too many) |
| Multi-task learning (seeCaruana,1998;Ruder,2017) | * | Several tasks can help each other to learn mutually useful feature extrac-tors,as long as the tasks do not compete for resources (network capacity) |
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| Weight elimination(Weigend et al.,1991) | Similar to weight decay but favorsfew stronger connections over manyweak ones. | × | | | | | Goal similar to Narrow andbroad Gaussians |
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| Segmentation with binarypotentials (BenTaieb andHamarneh,2016) | Penalty on anatomically implausi-ble image segmentations. | | X | | | | |
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