Geometric deep learning for business classification · gheynst. "Convolutional neural networks on...

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Geometric deep learning for business classification Henry Kenlay, Xiaowen Dong, Stephen Roberts Introduction Graph signal processing Processing of signals defined on vertex set of weighted and undirected graphs Geometric deep learning Deep learning on data residing on graphs Spectral approaches take inspiration from graph signal processing Business classification Given attributes of a business and a graph topology relating businesses in Edinburgh, can we predict if the restaurant has closed down? We use a graph convolutional neural network for classification hopefully exploiting pairwise relationships between businesses Graph signal processing and convolution on graphs Classification problem Graph CNN framework Filtering in the graph spectral domain Eigenvalue decomposition is Change of basis is also Can approximate filtering using Chebyshev polynomials [1] Further simplification by considering polynomials of order one [2] Results Results Benchmarks were competitive Review data gave slight advantage when using full set of features Random graphs were detrimental to performance Feature selection Using elastic net selected features improved performance for many approaches The benefit is less significant in graph convolutional neural networks Thresholding edges Thresholding the Jaccard graph improved performance despite disconnecting the graph and isolating 10.6% of the nodes Discussion Graph constructions Social data Statistical methods Longitudinal prediction Can we predict business closure in the future? Other frameworks Explore alternative graph convolutional neural network frameworks Theoretical approach to the importance of graph topology Theoretical bound on the output given a small perturbation of the input graph topology O(n 3 ) O(n 3 ) Propagation rule: H (l+1) = ReLU ˜ D - 1 2 ˜ A ˜ D - 1 2 H (l) W (l) Degree matrix Adjacency matrix Parameter matrix Layer properties - CNN correspondence Signal value on node i in layer K+1 is a function of the value at i as well as that at i’s 1-hop neighbours in layer K - localised filters Weight sharing across nodes - filters independent of input size Sparse multiplications give low computational cost Problem set up Yelp dataset - multimodal data about businesses Each restaurant is represented by a node in the graph with edges capturing relationship between businesses Each restaurant has an associated feature vector Label is if the restaurant is still operating (binary classification) Elastic net model used to select subset of features Importance of graph topology Edges provide a relational inductive bias Using no edges is equivalent to a multilayer perceptron We experiment with dierent ways to generate edge weights: Randomly Kernel-based methods (e.g., Gaussian RBF kernel) Restaurant distance Reviewer data - Jaccard index between two sets of reviewers (one for each restaurant) [1] Deerrard, Michaël, Xavier Bresson, and Pierre Vandergheynst. "Convolutional neural networks on graphs with fast localized spectral filtering." Advances in Neural Information Processing Systems. 2016. [2] Kipf, Thomas N., and Max Welling. "Semi-supervised classification with graph convolutional networks." arXiv preprint arXiv:1609.02907 (2016). Restaurant at node 9 is less expensive than average Restaurants at nodes 6 and 7 are related Restaurant at node 2 is more expensive than average Restaurants are nodes in the graph The scalar signal in this example is normalised price Contact: [email protected] -r 2 L = D - W Graph FT: Classical FT: Eigenfunction basis: Laplace operator: Graph Laplacian: Eigenvector basis: Classical convolution: Graph convolution: e i!x χ ` ˆ f (`) = hχ ` ,f i = N X i=1 χ ` (i) f (i) f (i)= N X `=1 ˆ f (`)χ ` (i) ˆ f (!) = he i!x ,f i = Z (e i!x ) f (x)dx f (x)= 1 2Z ˆ f (!)e i!x d! (f h)(i)= N X `=1 ˆ f (`) ˆ h(`)χ ` (i) (f h)(x)= Z f ()h(x - )d⌧ = 1 2Z ˆ f (!) ˆ h(!)e i!x d!

Transcript of Geometric deep learning for business classification · gheynst. "Convolutional neural networks on...

Page 1: Geometric deep learning for business classification · gheynst. "Convolutional neural networks on graphs with fast localized spectral filtering." ocessing Systems. 2016. elling.

Geometric deep learning for business classification Henry Kenlay, Xiaowen Dong, Stephen Roberts

IntroductionGraph signal processing • Processing of signals defined on vertex set of weighted and undirected graphsGeometric deep learning • Deep learning on data residing on graphs• Spectral approaches take inspiration from graph signal processingBusiness classification • Given attributes of a business and a graph topology relating businesses in

Edinburgh, can we predict if the restaurant has closed down?• We use a graph convolutional neural network for classification hopefully exploiting

pairwise relationships between businesses

Graph signal processing and convolution on graphs Classification problem

Graph CNN frameworkFiltering in the graph spectral domain • Eigenvalue decomposition is • Change of basis is also • Can approximate filtering using Chebyshev polynomials [1] • Further simplification by considering polynomials of order one [2]

ResultsResults • Benchmarks were competitive• Review data gave slight advantage when using full set of features• Random graphs were detrimental to performanceFeature selection • Using elastic net selected features improved performance for many

approaches• The benefit is less significant in graph convolutional neural networksThresholding edges • Thresholding the Jaccard graph improved performance despite

disconnecting the graph and isolating 10.6% of the nodes

DiscussionGraph constructions • Social data• Statistical methodsLongitudinal prediction • Can we predict business closure in the future?Other frameworks • Explore alternative graph convolutional neural network frameworksTheoretical approach to the importance of graph topology • Theoretical bound on the output given a small perturbation of the input

graph topology

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Propagation rule:

H(l+1) = ReLU

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Degree matrix Adjacency matrix Parameter matrix

Layer properties - CNN correspondence • Signal value on node i in layer K+1 is a function of the value at i

as well as that at i’s 1-hop neighbours in layer K - localised filters• Weight sharing across nodes - filters independent of input size• Sparse multiplications give low computational cost

Problem set up • Yelp dataset - multimodal data about businesses• Each restaurant is represented by a node in the graph with edges

capturing relationship between businesses• Each restaurant has an associated feature vector • Label is if the restaurant is still operating (binary classification)• Elastic net model used to select subset of features

Importance of graph topology • Edges provide a relational inductive bias• Using no edges is equivalent to a multilayer perceptron• We experiment with different ways to generate edge weights:• Randomly • Kernel-based methods (e.g., Gaussian RBF kernel)• Restaurant distance • Reviewer data - Jaccard index between two sets of reviewers

(one for each restaurant)[1] Defferrard, Michaël, Xavier Bresson, and Pierre Vandergheynst. "Convolutional neural networks on graphs with fast localized spectral filtering." Advances in Neural Information Processing Systems. 2016.[2] Kipf, Thomas N., and Max Welling. "Semi-supervised classification with graph convolutional networks." arXiv preprint arXiv:1609.02907 (2016).

Restaurant at node 9 is less expensive than average

Restaurants at nodes 6 and 7 are related

Restaurant at node 2 is more expensive than average

Restaurants are nodes in the graph

The scalar signal in this example is normalised price

Contact: [email protected]

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L = D �W<latexit sha1_base64="rj6lNmhYs1QdEDLcjyg3Vxp+iwk=">AAAB7HicbZA9SwNBEIbn/IzxK2ppsxgEG8OdCNoIQS0sLCJ4SSA5wt5mL1myt3fszgkh5DfYWChi6w+y89+4Sa7QxBcWHt6ZYWfeMJXCoOt+O0vLK6tr64WN4ubW9s5uaW+/bpJMM+6zRCa6GVLDpVDcR4GSN1PNaRxK3ggHN5N644lrIxL1iMOUBzHtKREJRtFa/v3V7WmjUyq7FXcqsgheDmXIVeuUvtrdhGUxV8gkNabluSkGI6pRMMnHxXZmeErZgPZ4y6KiMTfBaLrsmBxbp0uiRNunkEzd3xMjGhszjEPbGVPsm/naxPyv1sowugxGQqUZcsVmH0WZJJiQyeWkKzRnKIcWKNPC7kpYn2rK0OZTtCF48ycvQv2s4ll+OC9Xr/M4CnAIR3ACHlxAFe6gBj4wEPAMr/DmKOfFeXc+Zq1LTj5zAH/kfP4AxXWN/Q==</latexit><latexit sha1_base64="rj6lNmhYs1QdEDLcjyg3Vxp+iwk=">AAAB7HicbZA9SwNBEIbn/IzxK2ppsxgEG8OdCNoIQS0sLCJ4SSA5wt5mL1myt3fszgkh5DfYWChi6w+y89+4Sa7QxBcWHt6ZYWfeMJXCoOt+O0vLK6tr64WN4ubW9s5uaW+/bpJMM+6zRCa6GVLDpVDcR4GSN1PNaRxK3ggHN5N644lrIxL1iMOUBzHtKREJRtFa/v3V7WmjUyq7FXcqsgheDmXIVeuUvtrdhGUxV8gkNabluSkGI6pRMMnHxXZmeErZgPZ4y6KiMTfBaLrsmBxbp0uiRNunkEzd3xMjGhszjEPbGVPsm/naxPyv1sowugxGQqUZcsVmH0WZJJiQyeWkKzRnKIcWKNPC7kpYn2rK0OZTtCF48ycvQv2s4ll+OC9Xr/M4CnAIR3ACHlxAFe6gBj4wEPAMr/DmKOfFeXc+Zq1LTj5zAH/kfP4AxXWN/Q==</latexit><latexit sha1_base64="rj6lNmhYs1QdEDLcjyg3Vxp+iwk=">AAAB7HicbZA9SwNBEIbn/IzxK2ppsxgEG8OdCNoIQS0sLCJ4SSA5wt5mL1myt3fszgkh5DfYWChi6w+y89+4Sa7QxBcWHt6ZYWfeMJXCoOt+O0vLK6tr64WN4ubW9s5uaW+/bpJMM+6zRCa6GVLDpVDcR4GSN1PNaRxK3ggHN5N644lrIxL1iMOUBzHtKREJRtFa/v3V7WmjUyq7FXcqsgheDmXIVeuUvtrdhGUxV8gkNabluSkGI6pRMMnHxXZmeErZgPZ4y6KiMTfBaLrsmBxbp0uiRNunkEzd3xMjGhszjEPbGVPsm/naxPyv1sowugxGQqUZcsVmH0WZJJiQyeWkKzRnKIcWKNPC7kpYn2rK0OZTtCF48ycvQv2s4ll+OC9Xr/M4CnAIR3ACHlxAFe6gBj4wEPAMr/DmKOfFeXc+Zq1LTj5zAH/kfP4AxXWN/Q==</latexit><latexit sha1_base64="rj6lNmhYs1QdEDLcjyg3Vxp+iwk=">AAAB7HicbZA9SwNBEIbn/IzxK2ppsxgEG8OdCNoIQS0sLCJ4SSA5wt5mL1myt3fszgkh5DfYWChi6w+y89+4Sa7QxBcWHt6ZYWfeMJXCoOt+O0vLK6tr64WN4ubW9s5uaW+/bpJMM+6zRCa6GVLDpVDcR4GSN1PNaRxK3ggHN5N644lrIxL1iMOUBzHtKREJRtFa/v3V7WmjUyq7FXcqsgheDmXIVeuUvtrdhGUxV8gkNabluSkGI6pRMMnHxXZmeErZgPZ4y6KiMTfBaLrsmBxbp0uiRNunkEzd3xMjGhszjEPbGVPsm/naxPyv1sowugxGQqUZcsVmH0WZJJiQyeWkKzRnKIcWKNPC7kpYn2rK0OZTtCF48ycvQv2s4ll+OC9Xr/M4CnAIR3ACHlxAFe6gBj4wEPAMr/DmKOfFeXc+Zq1LTj5zAH/kfP4AxXWN/Q==</latexit>

Graph FT:Classical FT:

Eigenfunction basis:

Laplace operator: Graph Laplacian:

Eigenvector basis:

Classical convolution: Graph convolution:

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f(`) = h�`, fi =NX

i=1

�`(i)⇤f(i)

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f(i) =NX

`=1

f(`)�`(i)<latexit sha1_base64="humNT0UfpO6maUuWlkyaUKHb2jg=">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</latexit><latexit sha1_base64="humNT0UfpO6maUuWlkyaUKHb2jg=">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</latexit><latexit sha1_base64="humNT0UfpO6maUuWlkyaUKHb2jg=">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</latexit><latexit sha1_base64="humNT0UfpO6maUuWlkyaUKHb2jg=">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</latexit>

f(!) = hei!x, fi =Z(ei!x)⇤f(x)dx

<latexit sha1_base64="h8uWvFEDe2GkRQeLNRm2CNMf5Ss=">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</latexit><latexit sha1_base64="h8uWvFEDe2GkRQeLNRm2CNMf5Ss=">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</latexit><latexit sha1_base64="h8uWvFEDe2GkRQeLNRm2CNMf5Ss=">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</latexit><latexit sha1_base64="h8uWvFEDe2GkRQeLNRm2CNMf5Ss=">AAAC9HicbVFda9swFFW8ry77aLo97kUsDJJiip11NHsYlO6he+zG0hbiNMjytSMqy0aSOwfhf7K3sdf9k/2A/Y6+bjDF9kOa9oLg6Jyjq8s9Yc6Z0p73p+Pcu//g4aOtx90nT5893+7tvDhVWSEpTGjGM3keEgWcCZhopjmc5xJIGnI4Cy8/rvSzK5CKZeKrXuYwS0kiWMwo0Zaa95Ig5AWYYEE0jgdBlkJChhX+gANORMIBBxIiAxeGNRouq8rFsaUb2RqZ0Hhwlw8PL3Zt03KIo3Le63t7Xl34NvBb0Edtncx3OkUQZbRIQWjKiVJT38v1zBCpGeVQdYNCQU7oJUlgaqEgKaiZqTdS4TeWiXCcSXvseDW7/sKQVKllGlpnSvRCbWor8i5tWuh4PDNM5IUGQZuP4oJjneHVenHEJFDNlxYQKpmdFdMFkYRqG8KNX8pm1G4QQWzDq29mFUZlvhwfVcZzfX/f9cfvNyx2z61j5B+447fu6J11CPhGszQlIto1QdMl0FDqtbabrrrRmml1r7o2KH8zltvgdLTnW/x5v3941Ea2hV6h12iAfHSADtEndIImiKLf6Br9Rf+cK+e788P52VidTvvmJbpRzq//3Uvwlg==</latexit>

f(x) =1

2⇡

Zf(!)ei!xd!

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(f ⇤ h)(i) =NX

`=1

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(f ⇤ h)(x) =Z

f(⌧)h(x� ⌧)d⌧

=1

2⇡

Zf(!)h(!)ei!xd!

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engs1973
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Henry Kenlay – Geometric deep learning for business classification
engs1973
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Henry Kenlay – Geometric deep learning for business classification