What is ANN?
The field of machine learning greatly employs the technology of artificial intelligence neural networks (ANN). The idea behind these networks emulates how humans learn, as suggested by the term 'neural' in their name. ANNs utilize algorithms for adaption and learning from novel data inputs. These networks are fundamentally stochastic algorithms, consequently, their performance may vary upon each execution of the ANN code on the same dataset.
An artificial neural network comprises three layer types: input, output, and hidden. The hidden layer transforms the input into a usable format for the output layer and is adept at identifying complex patterns surpassing human cognition. Neural networks have been around since the 1940s, but their significant role in artificial intelligence has blossomed recently owing to the development of a technique known as 'backpropagation.' This allows networks to adjust their hidden layers when the outcome doesn't meet the expected result.
One notable evolution is the emergence of deep learning (DL) neural networks that distil unique features from multilayered networks until they discern what they are looking for. Artificial networks process information through several layers using mathematical computations. An ANN normally consists of hundreds to thousands of units arranged in sequential layers. The input layer receives multiform data from the environment that the network aims to understand or learn. The raw data is transformed by the hidden units into a form that the output unit can utilize.
Instrinsically, the majority of neural networks are entirely connected from one layer to the next. These connections are weighted, much like our brain, wherein a higher weight signifies a more potent impact of one cell on another. The end of the network is the output unit, where the network responds to and processes the given data.
ANNs emulate the human brain process where distinct regions handle different information types, and these regions are arranged hierarchically. To benefit ANNs, a hefty amount of data known as a 'training set' is provided for them to learn. This network then attempts to classify future information based on its learnings from the training set. The process of adjusting learning by revisiting the layers to tweak the mathematical equation if the machine's results don't match is called deep learning.
Teaching networks are one of the significant challenges in the realm of technology due to the time and tremendous processing power it demands. Another quandary lies in the nature of ANNs being 'black boxes' in which the user puts in data and receives results, yet the decision-making process remains opaque.
Many scholars are working on this, given the increasing applications of ANNs in areas like spam detection, natural language processing in chatbots, predictive analysis and more. As such, it's clear ANNs will continue to play an increasingly vital role in our lives.