<> <http://www.w3.org/2000/01/rdf-schema#comment> "The repository administrator has not yet configured an RDF license."^^<http://www.w3.org/2001/XMLSchema#string> . <> <http://xmlns.com/foaf/0.1/primaryTopic> <https://discovery.ucl.ac.uk/id/eprint/10150637> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/ontology/bibo/Article> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://purl.org/dc/terms/title> "A Gang of Adversarial Bandits"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://purl.org/ontology/bibo/abstract> "We consider running multiple instances of multi-armed bandit (MAB) problems in parallel. A main motivation for this study are online recommendation systems, in which each of N users is associated with a MAB problem and the goal is to exploit users' similarity in order to learn users' preferences to K items more efficiently. We consider the adversarial MAB setting, whereby an adversary is free to choose which user and which loss to present to the learner during the learning process. Users are in a social network and the learner is aided by a-priori knowledge of the strengths of the social links between all pairs of users. It is assumed that if the social link between two users is strong then they tend to share the same action. The regret is measured relative to an arbitrary function which maps users to actions. The smoothness of the function is captured by a resistance-based dispersion measure Ψ. We present two learning algorithms, GABA-I and GABA-II which exploit the network structure to bias towards functions of low Ψ values. We show that GABA-I has an expected regret bound of O(pln(N K/Ψ)ΨKT) and per-trial time complexity of O(K ln(N)), whilst GABA-II has a weaker O(pln(N/Ψ) ln(N K/Ψ)ΨKT) regret, but a better O(ln(K) ln(N)) per-trial time complexity. We highlight improvements of both algorithms over running independent standard MABs across users."^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://purl.org/dc/terms/date> "2021-01-01" . <https://discovery.ucl.ac.uk/id/document/1472946> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/ontology/bibo/Document> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://purl.org/ontology/bibo/volume> "3" . <https://discovery.ucl.ac.uk/id/org/ext-9d06671690dff3df7627ebee8b0d62a5> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Organization> . <https://discovery.ucl.ac.uk/id/org/ext-9d06671690dff3df7627ebee8b0d62a5> <http://xmlns.com/foaf/0.1/name> "NeurIPS"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://purl.org/dc/terms/publisher> <https://discovery.ucl.ac.uk/id/org/ext-9d06671690dff3df7627ebee8b0d62a5> . 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<https://discovery.ucl.ac.uk/id/eprint/10150637#authors> . <https://discovery.ucl.ac.uk/id/eprint/10150637#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_1> <https://discovery.ucl.ac.uk/id/person/ext-09219bae1891bcbc13cf54c1012d04fa> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-9d4caa0725797aa6f9fe8ae737e68f2c> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/10150637#authors> . <https://discovery.ucl.ac.uk/id/eprint/10150637#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_2> <https://discovery.ucl.ac.uk/id/person/ext-9d4caa0725797aa6f9fe8ae737e68f2c> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-c0ac4e290e28420f27a389f6eb1fd9a9> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/10150637#authors> . <https://discovery.ucl.ac.uk/id/eprint/10150637#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_3> <https://discovery.ucl.ac.uk/id/person/ext-c0ac4e290e28420f27a389f6eb1fd9a9> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://purl.org/dc/terms/creator> <https://discovery.ucl.ac.uk/id/person/ext-02f30538ddd583c609f3aec047206fac> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://purl.org/ontology/bibo/authorList> <https://discovery.ucl.ac.uk/id/eprint/10150637#authors> . <https://discovery.ucl.ac.uk/id/eprint/10150637#authors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_4> <https://discovery.ucl.ac.uk/id/person/ext-02f30538ddd583c609f3aec047206fac> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://www.loc.gov/loc.terms/relators/EDT> <https://discovery.ucl.ac.uk/id/person/ext-30225f6cdcc40935fb7f70b0444bd4a9> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://purl.org/ontology/bibo/editorList> <https://discovery.ucl.ac.uk/id/eprint/10150637#editors> . <https://discovery.ucl.ac.uk/id/eprint/10150637#editors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_1> <https://discovery.ucl.ac.uk/id/person/ext-30225f6cdcc40935fb7f70b0444bd4a9> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://www.loc.gov/loc.terms/relators/EDT> <https://discovery.ucl.ac.uk/id/person/ext-7361130ab70107ab4d98ef076a7b0e64> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://purl.org/ontology/bibo/editorList> <https://discovery.ucl.ac.uk/id/eprint/10150637#editors> . <https://discovery.ucl.ac.uk/id/eprint/10150637#editors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_2> <https://discovery.ucl.ac.uk/id/person/ext-7361130ab70107ab4d98ef076a7b0e64> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://www.loc.gov/loc.terms/relators/EDT> <https://discovery.ucl.ac.uk/id/person/ext-28a58e0f9e7e3c680275eeec04bbde60> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://purl.org/ontology/bibo/editorList> <https://discovery.ucl.ac.uk/id/eprint/10150637#editors> . <https://discovery.ucl.ac.uk/id/eprint/10150637#editors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_3> <https://discovery.ucl.ac.uk/id/person/ext-28a58e0f9e7e3c680275eeec04bbde60> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://www.loc.gov/loc.terms/relators/EDT> <https://discovery.ucl.ac.uk/id/person/ext-e880690d54ae14267ff8625decde17da> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://purl.org/ontology/bibo/editorList> <https://discovery.ucl.ac.uk/id/eprint/10150637#editors> . <https://discovery.ucl.ac.uk/id/eprint/10150637#editors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_4> <https://discovery.ucl.ac.uk/id/person/ext-e880690d54ae14267ff8625decde17da> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://www.loc.gov/loc.terms/relators/EDT> <https://discovery.ucl.ac.uk/id/person/ext-9ff7242f3ce663dbe438b7ab8a34ce08> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://purl.org/ontology/bibo/editorList> <https://discovery.ucl.ac.uk/id/eprint/10150637#editors> . <https://discovery.ucl.ac.uk/id/eprint/10150637#editors> <http://www.w3.org/1999/02/22-rdf-syntax-ns#_5> <https://discovery.ucl.ac.uk/id/person/ext-9ff7242f3ce663dbe438b7ab8a34ce08> . <https://discovery.ucl.ac.uk/id/person/ext-02f30538ddd583c609f3aec047206fac> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-02f30538ddd583c609f3aec047206fac> <http://xmlns.com/foaf/0.1/givenName> "M"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-02f30538ddd583c609f3aec047206fac> <http://xmlns.com/foaf/0.1/familyName> "Pontil"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-02f30538ddd583c609f3aec047206fac> <http://xmlns.com/foaf/0.1/name> "M Pontil"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-9d4caa0725797aa6f9fe8ae737e68f2c> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-9d4caa0725797aa6f9fe8ae737e68f2c> <http://xmlns.com/foaf/0.1/givenName> "S"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-9d4caa0725797aa6f9fe8ae737e68f2c> <http://xmlns.com/foaf/0.1/familyName> "Pasteris"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-9d4caa0725797aa6f9fe8ae737e68f2c> <http://xmlns.com/foaf/0.1/name> "S Pasteris"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-30225f6cdcc40935fb7f70b0444bd4a9> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-30225f6cdcc40935fb7f70b0444bd4a9> <http://xmlns.com/foaf/0.1/givenName> "M"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-30225f6cdcc40935fb7f70b0444bd4a9> <http://xmlns.com/foaf/0.1/familyName> "Ranzato"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-30225f6cdcc40935fb7f70b0444bd4a9> <http://xmlns.com/foaf/0.1/name> "M Ranzato"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-c0ac4e290e28420f27a389f6eb1fd9a9> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-c0ac4e290e28420f27a389f6eb1fd9a9> <http://xmlns.com/foaf/0.1/givenName> "F"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-c0ac4e290e28420f27a389f6eb1fd9a9> <http://xmlns.com/foaf/0.1/familyName> "Vitale"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-c0ac4e290e28420f27a389f6eb1fd9a9> <http://xmlns.com/foaf/0.1/name> "F Vitale"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-7361130ab70107ab4d98ef076a7b0e64> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-7361130ab70107ab4d98ef076a7b0e64> <http://xmlns.com/foaf/0.1/givenName> "A"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-7361130ab70107ab4d98ef076a7b0e64> <http://xmlns.com/foaf/0.1/familyName> "Beygelzimer"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-7361130ab70107ab4d98ef076a7b0e64> <http://xmlns.com/foaf/0.1/name> "A Beygelzimer"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-9ff7242f3ce663dbe438b7ab8a34ce08> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-9ff7242f3ce663dbe438b7ab8a34ce08> <http://xmlns.com/foaf/0.1/givenName> "J"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-9ff7242f3ce663dbe438b7ab8a34ce08> <http://xmlns.com/foaf/0.1/familyName> "Wortman Vaughan"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-9ff7242f3ce663dbe438b7ab8a34ce08> <http://xmlns.com/foaf/0.1/name> "J Wortman Vaughan"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-28a58e0f9e7e3c680275eeec04bbde60> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-28a58e0f9e7e3c680275eeec04bbde60> <http://xmlns.com/foaf/0.1/givenName> "Y"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-28a58e0f9e7e3c680275eeec04bbde60> <http://xmlns.com/foaf/0.1/familyName> "Dauphin"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-28a58e0f9e7e3c680275eeec04bbde60> <http://xmlns.com/foaf/0.1/name> "Y Dauphin"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-09219bae1891bcbc13cf54c1012d04fa> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-09219bae1891bcbc13cf54c1012d04fa> <http://xmlns.com/foaf/0.1/givenName> "M"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-09219bae1891bcbc13cf54c1012d04fa> <http://xmlns.com/foaf/0.1/familyName> "Herbster"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-09219bae1891bcbc13cf54c1012d04fa> <http://xmlns.com/foaf/0.1/name> "M Herbster"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-e880690d54ae14267ff8625decde17da> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . <https://discovery.ucl.ac.uk/id/person/ext-e880690d54ae14267ff8625decde17da> <http://xmlns.com/foaf/0.1/givenName> "PS"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-e880690d54ae14267ff8625decde17da> <http://xmlns.com/foaf/0.1/familyName> "Liang"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/person/ext-e880690d54ae14267ff8625decde17da> <http://xmlns.com/foaf/0.1/name> "PS Liang"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/ontology/bibo/Article> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://purl.org/ontology/bibo/presentedAt> <https://discovery.ucl.ac.uk/id/event/ext-c523f3a0bfd2454933ce5b945e05a869> . <https://discovery.ucl.ac.uk/id/event/ext-c523f3a0bfd2454933ce5b945e05a869> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/ontology/bibo/Conference> . <https://discovery.ucl.ac.uk/id/event/ext-c523f3a0bfd2454933ce5b945e05a869> <http://purl.org/dc/terms/title> "35th Conference on Neural Information Processing Systems (NeurIPS 2021)"^^<http://www.w3.org/2001/XMLSchema#string> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://eprints.org/ontology/EPrint> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://eprints.org/ontology/ProceedingsSectionEPrint> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://purl.org/dc/terms/isPartOf> <https://discovery.ucl.ac.uk/id/repository> . <https://discovery.ucl.ac.uk/id/eprint/10150637> <http://eprints.org/ontology/hasDocument> <https://discovery.ucl.ac.uk/id/document/1472946> . <https://discovery.ucl.ac.uk/id/document/1472946> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> 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