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History[ edit ] Warren McCulloch and Walter Pitts  created a computational model for neural networks based on mathematics and algorithms called threshold logic. This model paved the way for neural network research to split into two approaches.
One approach focused on biological processes in the brain while the other focused on the application of neural networks to artificial intelligence. This work led to work on nerve networks and their link to finite automata.
Hebb  created a learning hypothesis based on the mechanism of neural plasticity that became known as Hebbian learning. Hebbian learning is unsupervised learning. This evolved into models for long term potentiation.
Researchers started applying these ideas to computational models in with Turing's B-type machines. Farley and Clark  first used computational machines, then Learning integrated online network "calculators", to simulate a Hebbian network.
Other neural network computational machines were created by RochesterHolland, Habit and Duda With mathematical notation, Rosenblatt described circuitry not in the basic perceptron, such as the exclusive-or circuit that could not be processed by neural networks at the time.
The first was that basic perceptrons were incapable of processing the exclusive-or circuit. The second was that computers didn't have enough processing power to effectively handle the work required by large neural networks.
Neural network research slowed until computers achieved far greater processing power. Much of artificial intelligence had focused on high-level symbolic models that are processed by using algorithmscharacterized for example by expert systems with knowledge embodied in if-then rules, until in the late s research expanded to low-level sub-symbolic machine learningcharacterized by knowledge embodied in the parameters of a cognitive model.
Backpropagation distributed the error term back up through the layers, by modifying the weights at each node. Rumelhart and McClelland described the use of connectionism to simulate neural processes.
However, using neural networks transformed some domains, such as the prediction of protein structures. To overcome this problem, Schmidhuber adopted a multi-level hierarchy of networks pre-trained one level at a time by unsupervised learning and fine-tuned by backpropagation.
Once sufficiently many layers have been learned, the deep architecture may be used as a generative model by reproducing the data when sampling down the model an "ancestral pass" from the top level feature activations. Neural networks were deployed on a large scale, particularly in image and visual recognition problems.
This became known as " deep learning ". Nanodevices  for very large scale principal components analyses and convolution may create a new class of neural computing because they are fundamentally analog rather than digital even though the first implementations may use digital devices.
Between andrecurrent neural networks and deep feedforward neural networks developed in Schmidhuber 's research group won eight international competitions in pattern recognition and machine learning. Their neural networks were the first pattern recognizers to achieve human-competitive or even superhuman performance  on benchmarks such as traffic sign recognition IJCNNor the MNIST handwritten digits problem.
Researchers demonstrated that deep neural networks interfaced to a hidden Markov model with context-dependent states that define the neural network output layer can drastically reduce errors in large-vocabulary speech recognition tasks such as voice search.
Deep, highly nonlinear neural architectures similar to the neocognitron  and the "standard architecture of vision",  inspired by simple and complex cellswere pre-trained by unsupervised methods by Hinton. Learning is usually done without unsupervised pre-training.
In the convolutional layer, there are filters that are convolved with the input.NEW New Azure Learning Paths. Learning paths guide you through the training and help prepare you for developer, administrator, and solutions architect careers and Microsoft Azure certifications.
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