The AeroVelo Atlas is a human-powered helicopter (HPH) that was built for AHS International's Igor I. Sikorsky Human Powered Helicopter Competition . On 13 June 2013, it became the first aircraft to achieve the goals of the competition and thus won the prize.
127-558: AeroVelo , a team of students and graduates of the University of Toronto , began flight testing its Atlas quad rotor HPH on 28 August 2012. The core team of AeroVelo is the same group that created Snowbird , the first successful human-powered ornithopter . The Atlas is the largest HPH ever flown, and has a tip-to-tip rotor span of 154 ft (47 m), second only to the Russian Mil V-12 . The peak power of 1.1 kW (1.5 hp)
254-583: A Jesuit seminary, entered federation with the university in 1979. In contrast with the constituent colleges, the colleges of Knox, Massey, Regis, St. Michael's, Trinity, Victoria and Wycliffe continue to exist as legally distinct entities, each possessing a separate financial endowment . While St. Michael's, Trinity and Victoria continue to recognize their religious affiliations and heritage, they have since adopted secular policies of enrolment and teaching in non-divinity subjects. Some colleges have, or once had, collegiate structures of their own: Emmanuel College
381-527: A low church seminary, both encouraged their students to study for non-divinity degrees at University College. In 1885, they entered a formal affiliation with the University of Toronto, and became federated schools in 1890. The idea of federation initially met strong opposition at Victoria University , a Methodist school in Cobourg , but a financial incentive in 1890 convinced the school to join. Decades after
508-439: A "forget gate", introduced in 1999, which became the standard RNN architecture. In 1991, Jürgen Schmidhuber also published adversarial neural networks that contest with each other in the form of a zero-sum game , where one network's gain is the other network's loss. The first network is a generative model that models a probability distribution over output patterns. The second network learns by gradient descent to predict
635-415: A CNN was applied to medical image object segmentation and breast cancer detection in mammograms. LeNet -5 (1998), a 7-level CNN by Yann LeCun et al., that classifies digits, was applied by several banks to recognize hand-written numbers on checks digitized in 32x32 pixel images. Recurrent neural networks (RNN) were further developed in the 1980s. Recurrence is used for sequence processing, and when
762-535: A college be established in York. On March 15, 1827, a royal charter was formally issued by King George IV , proclaiming "from this time one College, with the style and privileges of a University ... for the education of youth in the principles of the Christian Religion , and for their instruction in the various branches of Science and Literature ... to continue for ever, to be called King's College." The granting of
889-600: A dramatic renaissance after the 2003 SARS crisis, and it is now Canada's largest public health school, with more than 750 faculty, 800 students, and research and training partnerships with institutions throughout Toronto and the world. With more than $ 39 million in research funding per year, the School supports discovery in global health, tobacco impacts on health , occupational disease and disability, air pollution, inner city health, circumpolar health, and many other pressing issues in population health. The Temerty Faculty of Medicine
1016-550: A form of polynomial regression, or a generalization of Rosenblatt's perceptron. A 1971 paper described a deep network with eight layers trained by this method, which is based on layer by layer training through regression analysis. Superfluous hidden units are pruned using a separate validation set. Since the activation functions of the nodes are Kolmogorov-Gabor polynomials, these were also the first deep networks with multiplicative units or "gates". The first deep learning multilayer perceptron trained by stochastic gradient descent
1143-434: A hidden layer with randomized weights that did not learn, and an output layer. He later published a 1962 book that also introduced variants and computer experiments, including a version with four-layer perceptrons "with adaptive preterminal networks" where the last two layers have learned weights (here he credits H. D. Block and B. W. Knight). The book cites an earlier network by R. D. Joseph (1960) "functionally equivalent to
1270-472: A hierarchy of RNNs pre-trained one level at a time by self-supervised learning where each RNN tries to predict its own next input, which is the next unexpected input of the RNN below. This "neural history compressor" uses predictive coding to learn internal representations at multiple self-organizing time scales. This can substantially facilitate downstream deep learning. The RNN hierarchy can be collapsed into
1397-704: A lack of understanding of how the brain wires its biological networks. In 2003, LSTM became competitive with traditional speech recognizers on certain tasks. In 2006, Alex Graves , Santiago Fernández, Faustino Gomez, and Schmidhuber combined it with connectionist temporal classification (CTC) in stacks of LSTMs. In 2009, it became the first RNN to win a pattern recognition contest, in connected handwriting recognition . In 2006, publications by Geoff Hinton , Ruslan Salakhutdinov , Osindero and Teh deep belief networks were developed for generative modeling. They are trained by training one restricted Boltzmann machine, then freezing it and training another one on top of
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#17328588042481524-464: A model that resembles those of the University of Cambridge and the University of Oxford in Britain. The colleges hold substantial autonomy over admissions, scholarships, programs and other academic and financial affairs, in addition to the housing and social duties of typical residential colleges . The system emerged in the 19th century, as ecclesiastical colleges considered various forms of union with
1651-755: A range of services and facilities, including a library, restaurants, barbershops, an art gallery, a theatre, concerts, debates, study spaces, and a swimming pool. The confluence of assorted functions is the result of an effort to create a holistic educational experience, a goal summarized in the Founders' Prayer. The Hart House model was influential in the planning of student centres at other universities, notably Cornell University 's Willard Straight Hall . Hart House resembles some traditional aspects of student representation through its financial support of student clubs, and its standing committees and board of stewards that are composed mostly of undergraduate students. However,
1778-616: A recurrent network is unrolled, it mathematically resembles a deep feedforward layer. Consequently, they have similar properties and issues, and their developments had mutual influences. In RNN, two early influential works were the Jordan network (1986) and the Elman network (1990), which applied RNN to study problems in cognitive psychology . In the 1980s, backpropagation did not work well for deep learning with long credit assignment paths. To overcome this problem, in 1991, Jürgen Schmidhuber proposed
1905-474: A single RNN, by distilling a higher level chunker network into a lower level automatizer network. In 1993, a neural history compressor solved a "Very Deep Learning" task that required more than 1000 subsequent layers in an RNN unfolded in time. The "P" in ChatGPT refers to such pre-training. Sepp Hochreiter 's diploma thesis (1991) implemented the neural history compressor, and identified and analyzed
2032-548: A variation of" this four-layer system (the book mentions Joseph over 30 times). Should Joseph therefore be considered the originator of proper adaptive multilayer perceptrons with learning hidden units? Unfortunately, the learning algorithm was not a functional one, and fell into oblivion. The first working deep learning algorithm was the Group method of data handling , a method to train arbitrarily deep neural networks, published by Alexey Ivakhnenko and Lapa in 1965. They regarded it as
2159-752: Is a public research university in Toronto , Ontario , Canada, located on the grounds that surround Queen's Park . It was founded by royal charter in 1827 as King's College , the first institution of higher learning in Upper Canada . Originally controlled by the Church of England , the university assumed its present name in 1850 upon becoming a secular institution. As a collegiate university , it comprises 11 colleges each with substantial autonomy on financial and institutional affairs and significant differences in character and history. The university maintains three campuses,
2286-463: Is a ceremonial boulevard and arterial thoroughfare that runs through downtown between Queen's Park and Front Street . The Spadina , St. George , Museum , Queen's Park , and St. Patrick stations of the Toronto subway system are nearby. The architecture is epitomized by a combination of Romanesque and Gothic Revival buildings spread across the eastern and central portions of campus, most dating between 1858 and 1929. The traditional heart of
2413-564: Is a college of Victoria and St. Hilda's College is part of Trinity; St. Joseph's College had existed as a college within St. Michael's until it was dissolved in 2006. Ewart College existed as an affiliated college until 1991, when it was merged into Knox College. Postgraduate theology degrees are conferred by the colleges of Knox, Regis and Wycliffe, along with the divinity faculties within Emmanuel, St. Michael's and Trinity, including joint degrees with
2540-408: Is affiliated with a network of ten teaching hospitals , providing medical treatment, research and advisory services to patients and clients from Canada and abroad. A core member of the network is University Health Network , itself a specialized federation of Toronto General Hospital , Princess Margaret Cancer Centre , Toronto Western Hospital , and Toronto Rehabilitation Institute . Physicians in
2667-676: Is an early example of the North American student centre , simultaneously serving cultural, intellectual, and recreational interests within its large Gothic-revival complex. University of Toronto alumni include five Prime Ministers of Canada (including William Lyon Mackenzie King and Lester B. Pearson ), three Governors General of Canada , nine foreign leaders, and 17 justices of the Supreme Court of Canada . As of 2024 , 13 Nobel laureates , six Turing Award winners, 100 Rhodes Scholars , and one Fields Medalist have been affiliated with
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#17328588042482794-418: Is an efficient application of the chain rule derived by Gottfried Wilhelm Leibniz in 1673 to networks of differentiable nodes. The terminology "back-propagating errors" was actually introduced in 1962 by Rosenblatt, but he did not know how to implement this, although Henry J. Kelley had a continuous precursor of backpropagation in 1960 in the context of control theory . The modern form of backpropagation
2921-429: Is an important benefit because unlabeled data are more abundant than the labeled data. Examples of deep structures that can be trained in an unsupervised manner are deep belief networks . The term Deep Learning was introduced to the machine learning community by Rina Dechter in 1986, and to artificial neural networks by Igor Aizenberg and colleagues in 2000, in the context of Boolean threshold neurons. Although
3048-1086: Is centered around stacking artificial neurons into layers and "training" them to process data. The adjective "deep" refers to the use of multiple layers (ranging from three to several hundred or thousands) in the network. Methods used can be either supervised , semi-supervised or unsupervised . Some common deep learning network architectures include fully connected networks , deep belief networks , recurrent neural networks , convolutional neural networks , generative adversarial networks , transformers , and neural radiance fields . These architectures have been applied to fields including computer vision , speech recognition , natural language processing , machine translation , bioinformatics , drug design , medical image analysis , climate science , material inspection and board game programs, where they have produced results comparable to and in some cases surpassing human expert performance. Early forms of neural networks were inspired by information processing and distributed communication nodes in biological systems , particularly
3175-420: Is hosting the annual convocation ceremonies, the building is a venue for academic and social events throughout the year. The sandstone buildings of Knox College epitomizes the North American collegiate Gothic design, with its characteristic cloisters surrounding a secluded courtyard. A lawn at the northeast is anchored by Hart House , a Gothic-revival student centre complex. Among its many common rooms,
3302-501: Is part of state-of-the-art systems in various disciplines, particularly computer vision and automatic speech recognition (ASR). Results on commonly used evaluation sets such as TIMIT (ASR) and MNIST ( image classification ), as well as a range of large-vocabulary speech recognition tasks have steadily improved. Convolutional neural networks were superseded for ASR by LSTM . but are more successful in computer vision. Yoshua Bengio , Geoffrey Hinton and Yann LeCun were awarded
3429-502: Is the massive Robarts Library complex, built in 1972 and opened a year later in 1973. It features raised podia, extensive use of triangular geometric designs and a towering 14-storey concrete structure that cantilevers above a field of open space and mature trees. Sidney Smith Hall is the home to the Faculty of Arts and Science, as well as a few departments within the faculty. The Leslie L. Dan Pharmacy Building , completed in 2006, exhibits
3556-603: The Canadian Institutes of Health Research , the Natural Sciences and Engineering Research Council and the Social Sciences and Humanities Research Council amounting to about one-third of the research budget. About eight per cent of research funding came from corporations, mostly in the healthcare industry . The first practical electron microscope was built by the physics department in 1938. During World War II,
3683-554: The Faculty of Medicine from Toronto-based philanthropists James and Louise Temerty . This broke the previous record for the school set in 2019 when Gerry Schwartz and Heather Reisman jointly donated $ 100 million for the creation of a 70,000-square-metre (750,000 sq ft) innovation and artificial intelligence centre. The Faculty of Medicine has been renamed the Temerty Faculty of Medicine in their honour. In December 2021,
3810-643: The Greco-Roman period, and the painting Adam and Eve by Lucas Cranach the Elder , dated from 1538. The University of Toronto Collection features Canadian contemporary art , while the University College Art Collection holds significant works by the Group of Seven and 19th century landscape artists . In the 2022 Academic Ranking of World Universities (also known as the Shanghai Ranking),
3937-700: The Group of Twenty , and the Citizen Lab , which conducts research on Internet censorship as a joint founder of the OpenNet Initiative . The university operates international offices in Berlin, Hong Kong and Siena . The Dalla Lana School of Public Health is a Faculty of the University of Toronto that began as one of the Schools of Hygiene begun by the Rockefeller Foundation in 1927. The School went through
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4064-735: The Hart House Debates were suspended, although exhibition and interfaculty games were still held. The David Dunlap Observatory in Richmond Hill opened in 1935, followed by the University of Toronto Institute for Aerospace Studies in 1949. By the 1961–62 academic year, the university had a total enrolment of 14,302 students, including 1,531 graduate students. The university opened suburban campuses in Scarborough in 1964 and in Mississauga in 1967. The university's former affiliated schools at
4191-506: The Mel-Cepstral features that contain stages of fixed transformation from spectrograms. The raw features of speech, waveforms , later produced excellent larger-scale results. Neural networks entered a null, and simpler models that use task-specific handcrafted features such as Gabor filters and support vector machines (SVMs) became the preferred choices in the 1990s and 2000s, because of artificial neural networks' computational cost and
4318-512: The Ontario Agricultural College and Glendon Hall became fully independent of the University of Toronto and became part of University of Guelph in 1964 and York University in 1965, respectively. Beginning in the 1980s, reductions in government funding prompted more rigorous fundraising efforts. In 2000, geophysicist Kin-Yip Chun was reinstated as a professor of the university, after he launched an unsuccessful lawsuit against
4445-499: The ReLU (rectified linear unit) activation function . The rectifier has become the most popular activation function for deep learning. Deep learning architectures for convolutional neural networks (CNNs) with convolutional layers and downsampling layers began with the Neocognitron introduced by Kunihiko Fukushima in 1979, though not trained by backpropagation. Backpropagation
4572-517: The Rotman School of Management . The Faculty of Applied Science and Engineering is the other major direct-entry undergraduate faculty. The University of Toronto is the birthplace of an influential school of thought on communication theory and literary criticism known as the Toronto School . Described as "the theory of the primacy of communication in the structuring of human cultures and
4699-653: The Spanish Civil War , the history of science and medicine , Canadiana and the history of books . The Cheng Yu Tung East Asian Library has a rare 40,000-volume Chinese collection from the Song Dynasty (960–1279) to the Qing Dynasty (1644–1911) that was originally held by scholar Mu Xuexun (1880–1929). The Richard Charles Lee Canada-Hong Kong Library has the largest research collection for Hong Kong and Canada–Hong Kong studies outside of Hong Kong. The rest of
4826-444: The high-tech architectural style of glass and steel by British architect Norman Foster . The University of Toronto has traditionally been a decentralized institution, with governing authority shared among its central administration, academic faculties and colleges. The Governing Council is the unicameral legislative organ of the central administration, overseeing general academic, business and institutional affairs. Before 1971,
4953-444: The human brain . However, current neural networks do not intend to model the brain function of organisms, and are generally seen as low-quality models for that purpose. Most modern deep learning models are based on multi-layered neural networks such as convolutional neural networks and transformers , although they can also include propositional formulas or latent variables organized layer-wise in deep generative models such as
5080-494: The optimization concepts of training and testing , related to fitting and generalization , respectively. More specifically, the probabilistic interpretation considers the activation nonlinearity as a cumulative distribution function . The probabilistic interpretation led to the introduction of dropout as regularizer in neural networks. The probabilistic interpretation was introduced by researchers including Hopfield , Widrow and Narendra and popularized in surveys such as
5207-425: The vanishing gradient problem . Hochreiter proposed recurrent residual connections to solve the vanishing gradient problem. This led to the long short-term memory (LSTM), published in 1995. LSTM can learn "very deep learning" tasks with long credit assignment paths that require memories of events that happened thousands of discrete time steps before. That LSTM was not yet the modern architecture, which required
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5334-966: The wake-sleep algorithm . These were designed for unsupervised learning of deep generative models. However, those were more computationally expensive compared to backpropagation. Boltzmann machine learning algorithm, published in 1985, was briefly popular before being eclipsed by the backpropagation algorithm in 1986. (p. 112 ). A 1988 network became state of the art in protein structure prediction , an early application of deep learning to bioinformatics. Both shallow and deep learning (e.g., recurrent nets) of ANNs for speech recognition have been explored for many years. These methods never outperformed non-uniform internal-handcrafting Gaussian mixture model / Hidden Markov model (GMM-HMM) technology based on generative models of speech trained discriminatively. Key difficulties have been analyzed, including gradient diminishing and weak temporal correlation structure in neural predictive models. Additional difficulties were
5461-471: The 1998 NIST Speaker Recognition benchmark. It was deployed in the Nuance Verifier, representing the first major industrial application of deep learning. The principle of elevating "raw" features over hand-crafted optimization was first explored successfully in the architecture of deep autoencoder on the "raw" spectrogram or linear filter-bank features in the late 1990s, showing its superiority over
5588-630: The 2018 Turing Award for "conceptual and engineering breakthroughs that have made deep neural networks a critical component of computing". Artificial neural networks ( ANNs ) or connectionist systems are computing systems inspired by the biological neural networks that constitute animal brains. Such systems learn (progressively improve their ability) to do tasks by considering examples, generally without task-specific programming. For example, in image recognition, they might learn to identify images that contain cats by analyzing example images that have been manually labeled as "cat" or "no cat" and using
5715-599: The British colonial elite, known as the Family Compact . Reformist politicians opposed the clergy's control over colonial institutions and fought to have the college secularized . In 1849, after a lengthy and heated debate, the newly elected responsible government of the Province of Canada voted to rename King's College as the University of Toronto and severed the school's ties with the church. Having anticipated this decision,
5842-661: The British use of wit . Smaller debating societies at Trinity, University and Victoria College have served as initial training grounds for debaters who later progress to Hart House. The club won the World Universities Debating Championship in 1981 and 2006. The North American Model United Nations (NAMUN) hosts an annual Model United Nations conference on campus, while the United Nations Society participates in various North American and international conferences. The Toronto chess team has captured
5969-525: The Niagara border in 1866. The Corps was part of the Reserve Militia led by professor Henry Croft . Established in 1878, the School of Practical Science was the precursor to the Faculty of Applied Science and Engineering , which has been nicknamed Skule since its earliest days. While the Faculty of Medicine opened in 1843, medical teaching was conducted by proprietary schools from 1853 until 1887 when
6096-502: The United States, alongside McGill University . Academically, the University of Toronto is noted for influential movements and curricula in literary criticism and communication theory , known collectively as the Toronto School . The university was the birthplace of insulin , stem cell research, the first artificial cardiac pacemaker , and the site of the first successful lung transplant and nerve transplant. The university
6223-809: The University of Toronto announced the launch of the Defy Gravity campaign, the largest fundraising campaign in Canadian history, with a goal of raising $ 4 billion for the university. The university grounds lie about 2 kilometres (1.2 mi) north of the Financial District in Downtown Toronto , immediately north of Chinatown and the Discovery District , and immediately south of the neighbourhoods of Yorkville and The Annex . The site encompasses 55.8 hectares (138 acres) bounded mostly by Bay Street to
6350-457: The University of Toronto in 1921 is considered among the most significant events in the history of medicine . The stem cell was discovered at the university in 1963, forming the basis for bone marrow transplantation and all subsequent research on adult and embryonic stem cells . This was the first of many findings at Toronto relating to stem cells, including the identification of pancreatic and retinal stem cells. The cancer stem cell
6477-430: The University of Toronto is Hart House , a neo-Gothic student activity centre that was initiated and financed by alumnus-benefactor Vincent Massey and named for his grandfather Hart . Opened in 1919, the complex aimed to establish a communitarian student culture in the university and its students, who at the time kept largely within their own colleges under the decentralized collegiate system. The Hart House offers
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#17328588042486604-399: The University of Toronto to ensure their viability. The desire to preserve religious traditions in a secular institution resulted in the federative collegiate model that came to characterize the university. University College was the founding nondenominational college, created in 1853 after the university was secularized. Knox College , a Presbyterian institution, and Wycliffe College ,
6731-483: The University of Toronto was named the top research university in Canada by Research Infosource, with a sponsored research income (external sources of funding) of $ 1,234.278 million in 2020. In the same year, the university's faculty averaged a sponsored research income of $ 446,600, while graduate students averaged a sponsored research income of $ 61,000. The federal government was the largest source of funding, with grants from
6858-462: The analytic results to identify cats in other images. They have found most use in applications difficult to express with a traditional computer algorithm using rule-based programming . An ANN is based on a collection of connected units called artificial neurons , (analogous to biological neurons in a biological brain ). Each connection ( synapse ) between neurons can transmit a signal to another neuron. The receiving (postsynaptic) neuron can process
6985-778: The art in generative modeling during 2014-2018 period. Excellent image quality is achieved by Nvidia 's StyleGAN (2018) based on the Progressive GAN by Tero Karras et al. Here the GAN generator is grown from small to large scale in a pyramidal fashion. Image generation by GAN reached popular success, and provoked discussions concerning deepfakes . Diffusion models (2015) eclipsed GANs in generative modeling since then, with systems such as DALL·E 2 (2022) and Stable Diffusion (2022). In 2015, Google's speech recognition improved by 49% by an LSTM-based model, which they made available through Google Voice Search on smartphone . Deep learning
7112-518: The building's Great Hall is noted for large stained-glass windows and a long quotation from John Milton 's Areopagitica inscribed around the walls. The adjacent Soldiers' Tower stands 143 feet (44 m) tall as the most prominent structure in the vicinity, its stone arches etched with the names of university members lost to the battlefields of the two World Wars. The tower houses a 51-bell carillon played on special occasions such as Remembrance Day and convocation. North of University College,
7239-552: The buried Taddle Creek , linking with Trinity College, Varsity Arena and the Faculty of Law . Victoria College is on the eastern side of Queen's Park, centred on a Romanesque main building made of contrasting red sandstone and grey limestone. Developed after the Second World War , the western section of the campus consists mainly of modernist and internationalist structures that house laboratories and faculty offices. The most significant example of Brutalist architecture
7366-420: The charter was largely the result of intense lobbying by John Strachan , the influential future first Anglican Bishop of Toronto who took office as the college's first president. The original three-storey Greek Revival school building was built on the present site of Queen's Park . Under Strachan's stewardship, King's College was a religious institution closely aligned with the Church of England and
7493-502: The country's legal education system away from the apprenticeship model that prevailed until the mid-20th century. The Ontario Institute for Studies in Education is the teachers college of the university, affiliated with its two laboratory schools , the Institute of Child Study and the University of Toronto Schools (a private high school run by the university). Autonomous institutes at
7620-511: The creation of New College in 1962, Innis College in 1964 and Woodsworth College in 1974, all of them nondenominational. Along with University College, they comprise the university's constituent colleges, which are established and funded by the central administration and are therefore financially dependent. Massey College was established in 1963 by the Massey Foundation as a college exclusively for graduate students. Regis College ,
7747-437: The data into a more suitable representation for a classification algorithm to operate on. In the deep learning approach, features are not hand-crafted and the model discovers useful feature representations from the data automatically. This does not eliminate the need for hand-tuning; for example, varying numbers of layers and layer sizes can provide different degrees of abstraction. The word "deep" in "deep learning" refers to
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#17328588042487874-755: The death of John Strachan, the Anglican seminary Trinity College entered federation in 1904, followed in 1910 by St. Michael's College , a Roman Catholic college founded by the Basilian Fathers . Among the institutions that had considered federation but ultimately remained independent were McMaster University , a Baptist school that later moved to Hamilton , and Queen's College, a Presbyterian school in Kingston that later became Queen's University . Constituent colleges Theological colleges Federated colleges Postgraduate college The post-war era saw
8001-468: The deep learning revolution was hardware advances, especially GPU. Some early work dated back to 2004. In 2009, Raina, Madhavan, and Andrew Ng reported a 100M deep belief network trained on 30 Nvidia GeForce GTX 280 GPUs, an early demonstration of GPU-based deep learning. They reported up to 70 times faster training. In 2011, a CNN named DanNet by Dan Ciresan, Ueli Meier, Jonathan Masci, Luca Maria Gambardella , and Jürgen Schmidhuber achieved for
8128-468: The depth is allowed to grow. Lu et al. proved that if the width of a deep neural network with ReLU activation is strictly larger than the input dimension, then the network can approximate any Lebesgue integrable function ; if the width is smaller or equal to the input dimension, then a deep neural network is not a universal approximator. The probabilistic interpretation derives from the field of machine learning . It features inference, as well as
8255-488: The east, Bloor Street to the north, Spadina Avenue to the west and College Street to the south. An enclave surrounded by university grounds, Queen's Park , contains the Ontario Legislative Building and several historic monuments. With its green spaces and many interlocking courtyards, the university forms a distinct region of urban parkland in the city's downtown core. The namesake University Avenue
8382-582: The enraged Strachan had resigned a year earlier to open Trinity College as a private Anglican seminary. University College was created as the nondenominational teaching branch of the University of Toronto. During the American Civil War , the threat of Union blockade on British North America prompted the creation of the University Rifle Corps , which saw battle in resisting the Fenian raids on
8509-575: The faculty absorbed the Toronto School of Medicine. Meanwhile, the university continued to set examinations and confer medical degrees. The university opened the Faculty of Law in 1887, followed by the Faculty of Dentistry in 1888 when the Royal College of Dental Surgeons became an affiliate. Women were first admitted to the university in 1884. A devastating fire in 1890 gutted the interior of University College and destroyed 33,000 volumes from
8636-612: The first one, and so on, then optionally fine-tuned using supervised backpropagation. They could model high-dimensional probability distributions, such as the distribution of MNIST images , but convergence was slow. The impact of deep learning in industry began in the early 2000s, when CNNs already processed an estimated 10% to 20% of all the checks written in the US, according to Yann LeCun. Industrial applications of deep learning to large-scale speech recognition started around 2010. The 2009 NIPS Workshop on Deep Learning for Speech Recognition
8763-523: The first time superhuman performance in a visual pattern recognition contest, outperforming traditional methods by a factor of 3. It then won more contests. They also showed how max-pooling CNNs on GPU improved performance significantly. In 2012, Andrew Ng and Jeff Dean created an FNN that learned to recognize higher-level concepts, such as cats, only from watching unlabeled images taken from YouTube videos. In October 2012, AlexNet by Alex Krizhevsky , Ilya Sutskever , and Geoffrey Hinton won
8890-412: The history of its appearance is apparently more complicated. Deep neural networks are generally interpreted in terms of the universal approximation theorem or probabilistic inference . The classic universal approximation theorem concerns the capacity of feedforward neural networks with a single hidden layer of finite size to approximate continuous functions . In 1989, the first proof
9017-441: The lack of training data and limited computing power. Most speech recognition researchers moved away from neural nets to pursue generative modeling. An exception was at SRI International in the late 1990s. Funded by the US government's NSA and DARPA , SRI researched in speech and speaker recognition . The speaker recognition team led by Larry Heck reported significant success with deep neural networks in speech processing in
9144-478: The large-scale ImageNet competition by a significant margin over shallow machine learning methods. Further incremental improvements included the VGG-16 network by Karen Simonyan and Andrew Zisserman and Google's Inceptionv3 . The success in image classification was then extended to the more challenging task of generating descriptions (captions) for images, often as a combination of CNNs and LSTMs. In 2014,
9271-567: The largest ever research grant in Canada, a $ 200 million grant from the Government of Canada in 2023. The Varsity Blues are the athletic teams that represent the university in intercollegiate league matches, primarily within U Sports , with ties to gridiron football , rowing and ice hockey. The earliest recorded instance of gridiron football occurred at University of Toronto's University College in November 1861. The university's Hart House
9398-464: The libraries, Robarts Library , holds about five million bound volumes that form the main collection for humanities and social sciences . The Thomas Fisher Rare Book Library constitutes one of the largest repositories of publicly accessible rare books and manuscripts . Its collections range from ancient Egyptian papyri to incunabula and libretti ; the subjects of focus include British, Western and Canadian literature , Aristotle , Darwin ,
9525-687: The library collections are dispersed at departmental and faculty libraries in addition to about 1.3 million bound volumes the colleges hold. The university has collaborated with the Internet Archive since 2005 to digitize some of its library holdings. Housed within University College, the University of Toronto Art Centre contains three major art collections. The Malcove Collection is primarily represented by Early Christian and Byzantine sculptures, bronzeware, furniture, icons and liturgical items. It also includes glassware and stone reliefs from
9652-566: The library, but the university restored the building and replenished its library within two years. Over the next two decades, a collegiate system took shape as the university arranged federation with several ecclesiastical colleges, including Strachan's Trinity College in 1904. The university operated the Royal Conservatory of Music from 1896 to 1991 and the Royal Ontario Museum from 1912 to 1968; both still retain close ties with
9779-521: The main students' unions on administrative and policy issues are the University of Toronto Students' Union , Association of Part-time Undergraduate Students and the Graduate Students' Union. Student representative bodies also exist at the various colleges, academic faculties and departments. The Hart House Debating Club employs a debating style that combines the American emphasis on analysis and
9906-477: The main building of Trinity College displays Jacobethan Tudor architecture , while its chapel was built in the Perpendicular Gothic style of Giles Gilbert Scott . The chapel features exterior walls of sandstone and interiors of Indiana Limestone and was built by Italian stonemasons using ancient building methods. Philosopher's Walk is a scenic footpath that follows a meandering, wooded ravine ,
10033-433: The medical institutes have cross-appointments to faculty and supervisory positions in university departments. The Rotman School of Management developed the discipline and methodology of integrative thinking , upon which the school used to base its curriculum. Founded in 1887, the Faculty of Law 's emphasis on formal teachings of liberal arts and legal theory was then considered unconventional, but gradually helped shift
10160-490: The nodes in deep belief networks and deep Boltzmann machines . Fundamentally, deep learning refers to a class of machine learning algorithms in which a hierarchy of layers is used to transform input data into a slightly more abstract and composite representation. For example, in an image recognition model, the raw input may be an image (represented as a tensor of pixels ). The first representational layer may attempt to identify basic shapes such as lines and circles,
10287-463: The number of layers through which the data is transformed. More precisely, deep learning systems have a substantial credit assignment path (CAP) depth. The CAP is the chain of transformations from input to output. CAPs describe potentially causal connections between input and output. For a feedforward neural network , the depth of the CAPs is that of the network and is the number of hidden layers plus one (as
10414-484: The oldest of which is St. George, located in downtown Toronto . The other two satellite campuses are located in Scarborough and Mississauga . The University of Toronto offers over 700 undergraduate and 200 graduate programs. The university receives the most annual scientific research funding and endowment of any Canadian university. It is also one of two members of the Association of American Universities outside
10541-550: The one by Bishop . There are two types of artificial neural network (ANN): feedforward neural network (FNN) or multilayer perceptron (MLP) and recurrent neural networks (RNN). RNNs have cycles in their connectivity structure, FNNs don't. In the 1920s, Wilhelm Lenz and Ernst Ising created the Ising model which is essentially a non-learning RNN architecture consisting of neuron-like threshold elements. In 1972, Shun'ichi Amari made this architecture adaptive. His learning RNN
10668-463: The output layer is also parameterized). For recurrent neural networks , in which a signal may propagate through a layer more than once, the CAP depth is potentially unlimited. No universally agreed-upon threshold of depth divides shallow learning from deep learning, but most researchers agree that deep learning involves CAP depth higher than two. CAP of depth two has been shown to be a universal approximator in
10795-472: The publication of the first observational evidence proving the existence of black holes . Toronto astronomers have also discovered the Uranian moons of Caliban and Sycorax , the dwarf galaxies of Andromeda I , II and III , and the supernova SN 1987A . A pioneer in computing technology, the university designed and built UTEC , one of the world's first operational computers, and later purchased Ferut ,
10922-463: The publication placed the university 19th in the world. In the 2024–25 U.S. News & World Report Best Global University Ranking , the university ranked 17th in the world, and first in Canada. The Canadian-based Maclean's magazine ranked the University of Toronto second in their 2022–2023 Medical Doctoral university category. Maclean's 2023 university rankings also ranked the University of Toronto first in its reputation survey. The university
11049-482: The reactions of the environment to these patterns. This was called "artificial curiosity". In 2014, this principle was used in generative adversarial networks (GANs). During 1985–1995, inspired by statistical mechanics, several architectures and methods were developed by Terry Sejnowski , Peter Dayan , Geoffrey Hinton , etc., including the Boltzmann machine , restricted Boltzmann machine , Helmholtz machine , and
11176-521: The recognition errors produced by the two types of systems was characteristically different, offering technical insights into how to integrate deep learning into the existing highly efficient, run-time speech decoding system deployed by all major speech recognition systems. Analysis around 2009–2010, contrasting the GMM (and other generative speech models) vs. DNN models, stimulated early industrial investment in deep learning for speech recognition. That analysis
11303-411: The same time, deep learning started impacting the field of art. Early examples included Google DeepDream (2015), and neural style transfer (2015), both of which were based on pretrained image classification neural networks, such as VGG-19 . Generative adversarial network (GAN) by ( Ian Goodfellow et al., 2014) (based on Jürgen Schmidhuber 's principle of artificial curiosity ) became state of
11430-531: The second commercial computer after UNIVAC I . Multi-touch technology was developed at Toronto, with applications ranging from handheld devices to high-end drawing monitors to collaboration walls . The AeroVelo Atlas , which won the Igor I. Sikorsky Human Powered Helicopter Competition in 2013, was developed by the university's team of students and graduates and was tested in Vaughan . The discovery of insulin at
11557-400: The second layer may compose and encode arrangements of edges, the third layer may encode a nose and eyes, and the fourth layer may recognize that the image contains a face. Importantly, a deep learning process can learn which features to optimally place at which level on its own . Prior to deep learning, machine learning techniques often involved hand-crafted feature engineering to transform
11684-555: The sense that it can emulate any function. Beyond that, more layers do not add to the function approximator ability of the network. Deep models (CAP > two) are able to extract better features than shallow models and hence, extra layers help in learning the features effectively. Deep learning architectures can be constructed with a greedy layer-by-layer method. Deep learning helps to disentangle these abstractions and pick out which features improve performance. Deep learning algorithms can be applied to unsupervised learning tasks. This
11811-573: The state of the art was training “very deep neural network” with 20 to 30 layers. Stacking too many layers led to a steep reduction in training accuracy, known as the "degradation" problem. In 2015, two techniques were developed to train very deep networks: the Highway Network was published in May 2015, and the residual neural network (ResNet) in Dec 2015. ResNet behaves like an open-gated Highway Net. Around
11938-543: The structuring of the human mind", the school is rooted in the works of Eric A. Havelock and Harold Innis and the subsequent contributions of Edmund Snow Carpenter , Northrop Frye and Marshall McLuhan . Since 1963, the McLuhan Program in Culture and Technology of the Faculty of Information has carried the mandate for teaching and advancing the Toronto School. Several notable works in arts and humanities are based at
12065-455: The time: "Until I reached Toronto," remarked Lord Dufferin during his visit in 1872, "I confess I was not aware that so magnificent a specimen of architecture existed upon the American continent ." The building was declared a National Historic Site of Canada in 1968. Built in 1907, Convocation Hall is recognizable for its domed roof and Ionic -pillared rotunda. Although its foremost function
12192-633: The top title six times at the Pan American Intercollegiate Team Chess Championship . The Formula SAE Racing Team won the Formula Student European Championships in 2003, 2005 and 2006. Deep learning Deep learning is a subset of machine learning that focuses on utilizing neural networks to perform tasks such as classification , regression , and representation learning . The field takes inspiration from biological neuroscience and
12319-457: The university alleging racial discrimination. In 2017, a human rights application was filed against the University by one of its students for allegedly delaying the investigation of sexual assault and being dismissive of their concerns. In 2018, the university cleared one of its professors of allegations of discrimination and antisemitism in an internal investigation, after a complaint was filed by one of its students. The University of Toronto
12446-559: The university as independent institutions. The University of Toronto Press was founded in 1901 as Canada's first academic publishing house . The Faculty of Forestry, founded in 1907 with Bernhard Fernow as dean, was Canada's first university faculty devoted to forest science. In 1910, the Faculty of Education opened its laboratory school , the University of Toronto Schools . The First and Second World Wars curtailed some university activities as undergraduate and graduate men eagerly enlisted. Intercollegiate athletic competitions and
12573-552: The university developed the G-suit , a life-saving garment worn by Allied fighter plane pilots, later adopted for use by astronauts. Development of the infrared chemiluminescence technique improved analyses of energy behaviours in chemical reactions. In 1963, the asteroid 2104 Toronto is discovered in the David Dunlap Observatory in Richmond Hill and is named after the university. In 1972, studies on Cygnus X-1 led to
12700-483: The university fourth in the world, and first in Canada. The University Ranking by Academic Performance 2019–2020 rankings placed the university second in the world, and first in Canada. Along with academic and research-based rankings, the university has also been ranked by publications that evaluate the employment prospects of its graduates. In the Times Higher Education's 2022 global employability ranking,
12827-531: The university grounds in Toronto's Discovery District , conducting $ 1 billion of medical research annually. MaRS Discovery District is a research park that serves commercial enterprises and the university's technology transfer ventures. In 2008, the university disclosed 159 inventions and had 114 active start-up companies. Its SciNet Consortium operates the most powerful supercomputer in Canada. A notable hub for social, cultural and recreational activities at
12954-907: The university include the Canadian Institute for Theoretical Astrophysics , the Pontifical Institute of Mediaeval Studies and the Fields Institute . Within the Faculty of Arts and Science, notable departments include the Department of Mathematics . The University of Toronto Libraries is the third-largest academic library system in North America, following those of Harvard and Yale , measured by number of volumes held. Its collections include more than 12 million print books, 1.9 million digital books, over 160,000 journal titles, and close to 30,000 metres of archival materials. The largest of
13081-538: The university operated the Connaught Medical Research Laboratories , now part of the pharmaceutical corporation Sanofi-Aventis . Among the research conducted at the laboratory was the development of gel electrophoresis . The University of Toronto is the primary research presence that supports one of the world's largest concentrations of biotechnology firms. More than 5,000 principal investigators reside within 2 kilometres (1.2 mi) from
13208-463: The university ranked 11th in the world, and first in Canada. In QS's 2022 graduate employability ranking, the university ranked 21st in the world, and first in Canada. In a 2013 employment survey conducted by the New York Times , the University of Toronto was ranked 14th in the world. In 2018, the University of Toronto Entrepreneurship was ranked the fourth best university-based incubator in
13335-483: The university ranked 22nd in the world and first in Canada. The 2023 QS World University Rankings ranked the university 21st in the world, and first in Canada. In 2019, it ranked 11th among the universities around the world by SCImago Institutions Rankings . The 2023 Times Higher Education World University Rankings ranked the university 18th in the world, and first in Canada. In the Times' 2020 reputational ranking,
13462-787: The university through the Toronto School of Theology . The Faculty of Arts and Science is the university's main undergraduate faculty, and administers most of the courses in the college system. While the colleges are not entirely responsible for teaching duties, most of them house specialized academic programs and lecture series. Among other subjects, Trinity College is associated with programs in international relations , as are University College with Canadian studies , Victoria College with Renaissance studies , Innis College with film studies and urban studies , New College with gender studies , Woodsworth College with industrial relations and St. Michael's College with Medieval studies . The faculty teaches undergraduate commerce in collaboration with
13589-428: The university was governed under a bicameral system composed of the board of governors and the university senate. The chancellor, usually a former governor general , lieutenant governor , premier or diplomat, is the ceremonial head of the university. The president is appointed by the council as the chief executive. Unlike most North American institutions, the University of Toronto is a collegiate university with
13716-590: The university's various programs and curricula in international affairs, foreign policy, and public policy . As the Cold War heightened, Toronto's Slavic studies program evolved into an important institution on Soviet politics and economics, financed by the Rockefeller , Ford and Mellon foundations. The Munk School is also home to the G20 Research Group , which conducts independent monitoring and analysis on
13843-672: The university, including the Dictionary of Canadian Biography since 1959 and the Collected Works of Erasmus since 1969. The Records of Early English Drama collects and edits the surviving documentary evidence of dramatic arts in pre- Puritan England, while the Dictionary of Old English compiles the early vocabulary of the English language from the Anglo-Saxon period. The Munk School of Global Affairs and Public Policy encompasses
13970-408: The university, known as Front Campus, is near the campus centre in an oval lawn enclosed by King's College Circle. The centrepiece is the main building of University College , built in 1857 with an eclectic blend of Richardsonian Romanesque and Norman architectural elements. The dramatic effect of this blended design by architect Frederick William Cumberland drew praise from European visitors of
14097-582: The university. The founding of a colonial college had long been the desire of John Graves Simcoe , the first Lieutenant-Governor of Upper Canada and founder of York , the colonial capital. As an Oxford -educated military commander who had fought in the American Revolutionary War , Simcoe believed a college was needed to counter the spread of republicanism from the United States . The Upper Canada Executive Committee recommended in 1798 that
14224-441: The world by UBI Global in the "World Top Business Incubator – Managed by a University" category. Since 1926, the University of Toronto has been a member of the Association of American Universities , a consortium of the leading North American research universities. The university manages by far the largest annual research budget of any university in Canada with sponsored direct-cost expenditures of $ 878 million in 2010. In 2021,
14351-427: Was also home to the first electron microscope , the development of deep learning , neural network , multi-touch technology, the identification of the first black hole Cygnus X-1 , and the development of the theory of NP-completeness . The University of Toronto is the recipient of both the single largest philanthropic gift in Canadian history, a $ 250 million donation from James and Louise Temerty in 2020, and
14478-433: Was created by leaning the bike, which flexed the entire helicopter frame, tilting the rotor axes. The AeroVelo Atlas HPH made its first flight on 28 August 2012. On 13 June 2013, with a flight commencing at 12:43PM EDT, the team managed to keep Atlas in the air for 64.11 seconds, reach a peak altitude of 3.3 m (11 ft) and drift no more than 9.8 m (32 ft) from the starting point. Data from that flight
14605-839: Was done with comparable performance (less than 1.5% in error rate) between discriminative DNNs and generative models. In 2010, researchers extended deep learning from TIMIT to large vocabulary speech recognition, by adopting large output layers of the DNN based on context-dependent HMM states constructed by decision trees . The deep learning revolution started around CNN- and GPU-based computer vision. Although CNNs trained by backpropagation had been around for decades and GPU implementations of NNs for years, including CNNs, faster implementations of CNNs on GPUs were needed to progress on computer vision. Later, as deep learning becomes widespread, specialized hardware and algorithm optimizations were developed specifically for deep learning. A key advance for
14732-409: Was first identified in 1997 by Toronto researchers, who have since found stem cell associations in leukemia , brain tumours and colorectal cancer . Medical inventions developed at Toronto include the glycaemic index , the infant cereal Pablum , the use of protective hypothermia in open heart surgery and the first artificial cardiac pacemaker . The first successful single-lung transplant
14859-471: Was first published in Seppo Linnainmaa 's master thesis (1970). G.M. Ostrovski et al. republished it in 1971. Paul Werbos applied backpropagation to neural networks in 1982 (his 1974 PhD thesis, reprinted in a 1994 book, did not yet describe the algorithm ). In 1986, David E. Rumelhart et al. popularised backpropagation but did not cite the original work. The time delay neural network (TDNN)
14986-402: Was generated only during the first few seconds to climb to the required 3-metre (9.8 ft) altitude. By the end of the flight, power had reduced to 600 W (0.80 hp). Todd Reichert, the pilot and a racing cyclist, had specifically trained for such a power profile . The design specifically took advantage of the ground effect possible by the altitude required to win the prize. Control
15113-436: Was introduced in 1987 by Alex Waibel to apply CNN to phoneme recognition. It used convolutions, weight sharing, and backpropagation. In 1988, Wei Zhang applied a backpropagation-trained CNN to alphabet recognition. In 1989, Yann LeCun et al. created a CNN called LeNet for recognizing handwritten ZIP codes on mail. Training required 3 days. In 1990, Wei Zhang implemented a CNN on optical computing hardware. In 1991,
15240-720: Was motivated by the limitations of deep generative models of speech, and the possibility that given more capable hardware and large-scale data sets that deep neural nets might become practical. It was believed that pre-training DNNs using generative models of deep belief nets (DBN) would overcome the main difficulties of neural nets. However, it was discovered that replacing pre-training with large amounts of training data for straightforward backpropagation when using DNNs with large, context-dependent output layers produced error rates dramatically lower than then-state-of-the-art Gaussian mixture model (GMM)/Hidden Markov Model (HMM) and also than more-advanced generative model-based systems. The nature of
15367-546: Was performed at Toronto in 1981, followed by the first nerve transplant in 1988, and the first double-lung transplant in 1989. Researchers identified the maturation promoting factor that regulates cell division , and discovered the T-cell receptor , which triggers responses of the immune system. The university is credited with isolating the genes that cause Fanconi anemia , cystic fibrosis and early-onset Alzheimer's disease , among numerous other diseases. Between 1914 and 1972,
15494-437: Was published by George Cybenko for sigmoid activation functions and was generalised to feed-forward multi-layer architectures in 1991 by Kurt Hornik. Recent work also showed that universal approximation also holds for non-bounded activation functions such as Kunihiko Fukushima 's rectified linear unit . The universal approximation theorem for deep neural networks concerns the capacity of networks with bounded width but
15621-438: Was published in 1967 by Shun'ichi Amari . In computer experiments conducted by Amari's student Saito, a five layer MLP with two modifiable layers learned internal representations to classify non-linearily separable pattern classes. Subsequent developments in hardware and hyperparameter tunings have made end-to-end stochastic gradient descent the currently dominant training technique. In 1969, Kunihiko Fukushima introduced
15748-596: Was ranked in spite of having opted out—along with several other universities in Canada—of participating in Maclean's graduate survey since 2006. The university's research performance has been noted in several bibliometric university rankings, which use citation analysis to evaluate the impact a university has on academic publications. In 2019, the Performance Ranking of Scientific Papers for World Universities ranked
15875-403: Was republished by John Hopfield in 1982. Other early recurrent neural networks were published by Kaoru Nakano in 1971. Already in 1948, Alan Turing produced work on "Intelligent Machinery" that was not published in his lifetime, containing "ideas related to artificial evolution and learning RNNs". Frank Rosenblatt (1958) proposed the perceptron, an MLP with 3 layers: an input layer,
16002-605: Was submitted to AHS International. After this was reviewed by its panel of vertical flight technical experts, AHS International announced that the flight had met the requirements of the competition and that AeroVelo had officially won the $ 250,000 prize on 11 July 2013. A section was donated to the New England Air Museum in 2017. Data from Aviation Week and Space Technology 15 July 2013 General characteristics Performance University of Toronto The University of Toronto ( UToronto or U of T )
16129-470: Was the first Canadian university to amass a financial endowment greater than one billion dollars in 2007. From 2011 to 2018, the university embarked on the Boundless fundraising campaign, which concluded in 2018 at $ 2.641 billion raised, setting a new all-time fundraising record in Canada. On September 24, 2020, the university announced the single largest donation in Canadian history, a $ 250 million gift to
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