966 research outputs found
Understanding Risk Extrapolation (REx) and when it finds Invariant Relationships
No full textGeneralizing models for new unknown datasets is a common problem in machine learning. Algorithms that perform well for test instances with the same distribution as their training dataset often perform severely on new datasets with a different distribution. This problem is caused by distributional shifts between the training of the model and applying that model to a test domain. This paper addresses whether and in what situations Risk Extrapolation (REx) can tackle this problem of Out-Of-Distribution generalization by exploiting invariant relationships. These relationships are based on features that are invariant across all domains. By learning these relationships, REx aims to learn the concept of the problem we are trying to solve. We show in what situations REx can learn these invariant relationships and when it does not. We translate the definition of an invariant relationship into a homoscedastic synthetic dataset with either covariate, confounded, anti-causal, or hybrid shift. We expose REx to experiments in sample complexity, the number of training domains, and the training domain distance. We show that REx performs better for invariant prediction in situations with larger sample sizes and training domain distance and that if these criteria are met, REx performs equivalently in all four distributional shifts. We also compare REx to Invariant- and Empirical Risk Minimization and show that; REx is less sensitive and thus robust to the shifting of the average distributional variance in the training domains; REx asymptotically out-performs the methods in the more complex distributional shifts.https://gitlab.com/hofland.jeroen/rex-distributional-shift CodeCSE3000 Research ProjectComputer Science and Engineerin
Rex J. Rowley
No full textAudio recording of the 10/06/13 UNLV Libraries Author Series event featuring Rex. J. Rowley, author of Everyday Las Vegas: Local Life in a Tourist Town. Includes remarks by Libraries Dean Patricia Iannuzzi, CGR Director Dave Schwartz, and Rowley
Rhinolophus rex G. M. Allen 1923
No full textRhinolophus rex G. M. Allen, 1923 King horseshoe bat Rhinolophus paradoxolophus (Bourret, 1951) Bourret’s horseshoe bat These taxa appear to be very closely related and there has been some disagreement in the literature regarding whether or not they represent discrete species. For these reasons they are considered together here. Rhinolophus rex has previously been separated from R. paradoxolophus on the basis of small differences in external, cranial and dental measurements with the former considered to be the fractionally larger species. For example, R. paradoxolophus has a forearm length of 50.5–57 mm, R. rex 56.5–63 mm (Csorba et al., 2003). In our surveys, several bats captured in Guangxi had forearm lengths that would classify them as R. paradoxolophus, while our Yunnan bat had a forearm length that fits the measurements for R. rex. Despite these size differences, these bats called at similar call frequencies. Francis (in Eger and Fenton 2003) record- ed R. paradoxolophus at 22–25 kHz in Lao PDR, and hence it appears that the call frequencies used by R. paradoxolophus and R. rex are identical. Eger and Fenton (2003) recorded R. paradoxolophus at 43 kHz in China, but presumably measured the third harmonic of a signal with a fundamental at about 14 kHz. We consider that the small differences in body size are inadequate descriptors of taxonomic distinctiveness between R. paradoxolophus and R. rex, and given that their echolocation calls are very similar we suggest they are probably the same taxon. Rhinolophus paradoxolophus occurs at more southerly locations than R. rex, and the forms are probably best recognized as geographical races (subspecies). Because R. rex (1923) was named before R. paradoxolophus (1951) we suggest that the taxa are synonymised under the name R. rex and considered as one species. An account of the biology of R. paradoxolophus is given by Eger and Fenton (2003). Rhinolophus rex FA — 51.6–57.3 mm, mass — 10.8–14 g. Four males and 10 females were captured in Guangxi, Guizhou and Yunnan. Rhinolophus rex calls at a very low frequency, FMAXE 23.7–26.4 kHz, with calls dominated by the second harmonic. Previous records from China (for R. rex): Chongqing, Guangdong, Guangxi, Guizhou, Sichuan and Yunnan (Zhang, 1997; Wang, 2003). Ecological Notes This species is restricted to southern provinces where it is only encountered in small numbers in caves. Echolocation calls are audible at close range to the unaided ear.Published as part of Zhang, Libiao, Jones, Gareth, Zhang, Jinshuo, Zhu, Guangjian & Parsons, Stuart, 2009, Recent surveys of bats (Mammalia: Chiroptera) from China. I. Rhinolophidae and Hipposideridae, pp. 71-88 in Acta Chiropterologica 11 (1) on pages 78-79, DOI: 10.3161/150811009X465703, http://zenodo.org/record/394451
"POCKETS REX" Exhibition Map
No full textReceived from Joel Parsons, Clough Hanson Gallery Director, in Spring of 2023.This is a gallery map to an exhibition titled "POCKETS REX" and features artwork buy Clare Torina. This exhibition was on display in Clough Hanson Gallery from September 3 to October 14, 2022
Captain Cook [picture] /
No full textBeddie, 3398?; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.pic-an9188794; Rex Nan Kivell Collection NK1627, NK2047.; U3084; U3086; S3567; S6544
Memo from Rex J. Stanton, Supt., Heart Mountain Relocation Projec,t to Mr. Shoji Nagumo, January 16, 1943
No full textMemorandum of understanding from Rex Stanton to Shoji Nagumo regarding a job opening for a plumber-fireman position at Heart Mountain incarceration camp.The Japanese American Archival Collection documents the people, places, and daily life of Japanese Americans, primarily those who lived in the once thriving community of pre-war Florin in the Sacramento region, as well as the conditions in American incarceration camps during World War II. The approximately 7,000 original items include personal and official letters, photographs, diaries, arts and crafts, newsletters, textiles, camps artifacts, yearbooks and other publications
Peter B. Maling, Christchurch, New Zealand [picture] /
No full textTitle devised from compactus card.; Inscriptions: "Peter B. Maling. Photograph for reference"--On compactus card, "Print U/1633 11535"--In pencil on verso; photographers stamp.; Rex Nan Kivell Collection NK11535.; Also available online http://nla.gov.au/nla.pic-vn6093270. Dr Peter B. Maling is a New Zealand author and historian. He was a friend and correspondent of Rex Nan Kivell
Innovation : an expert's insight on the issue in Arizona
No full textabstract: Innovation—introducing something new—in the 21st century mostly derives from technological advances. Innovation drives the modern economy, leading to gains in productivity and prosperity. In this edition of Indicator Insight, author Tom Rex discusses innovation in Arizona in terms of human capital, financial capital, and high-technology employment.Indicator insight ; volume 3, issue 3The Arizona Indicators Panel is a partnership of Arizona State University, The Arizona Republic, Arizona Community Foundation, Valley of the Sun United Way, and the Arizona Dept. of Commerce
William Cobbett, author of the Political Register [picture]
No full textFacsimile autograph: Wm. Cobbett.; Catalogue of engraved British portraits; engraved by D. Maclise.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.pic-an9351838; Rex Nan Kivell Collection NK10965.; U6467
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