# A description of neural network technology

### Neural networks applications

Logistic regression with only one feature implemented via a neural network This is a single feature logistic regression we are giving the model only one X variable expressed through a neural network if you need a refresher on logistic regression, I wrote about that here. New inputs are presented to the input pattern where they filter into and are processed by the middle layers as though training were taking place, however, at this point the output is retained and no backpropagation occurs. Some software freely available software packages NevProp, bp, Mactivation do allow the user to sample the networks 'progress' at regular time intervals, but the learning itself progresses on its own. Hebb [3] created a learning hypothesis based on the mechanism of neural plasticity that became known as Hebbian learning. The error surface itself is a hyperparaboloid but is seldom 'smooth' as is depicted in the graphic below. Neural networks are universal approximators, and they work best if the system you are using them to model has a high tolerance to error. Between two layers, multiple connection patterns are possible. Above all, these neural nets are capable of discovering latent structures within unlabeled, unstructured data, which is the vast majority of data in the world. Applications of artificial neural networks Image recognition was one of the first areas to which neural networks were successfully applied, but the technology uses have expanded to many more areas, including: Natural language processing, translation and language generation Stock market prediction Delivery driver route planning and optimization Drug discovery and development These are just a few specific areas to which neural networks are being applied today. It does not know which weights and biases will translate the input best to make the correct guesses. Although there are many different kinds of learning rules used by neural networks, this demonstration is concerned only with one; the delta rule. Main article: Backpropagation Backpropagation is a method to adjust the connection weights to compensate for each error found during learning. Machine learning means the ANN can learn from events and make decisions based on the observations. The nonlinear transforms at each node are usually s-shaped functions similar to logistic regression. The concept of neural networks, which has its roots in artificial intelligence, is swiftly gaining popularity in the development of trading systems.

Start Your Free Trial Today In contrast, certain neural networks are trained through unsupervised learning, in which a network is presented with a collection of input data and given the goal of discovering patternsâ€”without being told what specifically to look for.

They save the output of processing nodes and feed the result back into the model. A neural network contains layers of interconnected nodes. Given raw data in the form of an image, a deep-learning network may decide, for example, that the input data is 90 percent likely to represent a person.

Except instead of signal, we are moving error backwards through our model. The Basics of Neural Networks Neural neworks are typically organized in layers.

So by applying small isolated shocks to each beta coefficient and measuring its impact on the cost function, it is relatively straightforward to figure out in which direction we need to move to reduce and eventually minimize the cost function.

Recurrent neural networks RNN are more complex. The nonlinear transforms at each node are usually s-shaped functions similar to logistic regression.

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