# Deep Learning

**Deep Learning** is a technique used to implement Machine Learning using things such as **neural** **networks**, self-organizing maps, and stacked **auto encoders**. Deep learning technologies are a top priority for tech giants such as **Google** and **Facebook**, but also for anyone who wants to take advantage of data, with hardware speeds reaching new heights and more data being collected than ever. Deep learning can be considered as a subset of **machine learning**. It is a field that is focused on **learning** and **developing** on its own by studying computer algorithms. Deep learning operates with artificial neural networks, which are programmed to mimic how people think and learn, while machine learning uses simpler principles.

Until recently, computational capacity restricted neural networks and was also restricted in **complexity**. Big data analytics developments have, however, allowed larger, sophisticated neural networks to allow computers to **analyse**, **learn**, and **respond** more quickly than humans to **complex** situations. Deep learning has helped identify **pictures**, **translate** **languages**, and **recognize** **speeches**. It can be used without human interference and to solve any pattern recognition problem.

Deep learning is driven by **artificial neural** networks, which contain several layers. Deep Neural Networks (DNNs) are those kinds of networks where complex operations such as **representation** and **abstraction** that make sense of images, sound, and text can be performed by each layer. Deep learning, considered the **fastest-growing** field in machine learning, is a truly disruptive digital technology and is being used to create new business models by more and more **companies**.

**How Does Deep Learning Work?**

Neural networks are made up of **node** **layers**, much as neurons make up the human brain. Nodes are connected to neighboring layers within **individual layers**. Based on the amount of layers that it has, the network is said to be wider. Thousands of signals from other neurons are received by a single neuron in the human brain. Signals move between nodes in an artificial neural network and distribute corresponding weights. On the next layer of nodes, a heavier weighted node will exert more effect. To generate an **output**, the final layer compiles the weighted **inputs**. **Deep learning** systems require strong hardware because they process a large amount of data and involve a number of complicated **mathematical calculations**. However, even with such advanced hardware, computing for deep learning training will take weeks. In order to return **accurate** results, **deep learning** systems require large amounts of data; accordingly, information is **fed** as huge data sets. Artificial neural networks can **distinguish** data while processing the data with the answers obtained from a series of binary true or false questions that require highly **complex** mathematical calculations. For example, by learning to recognized edges and lines of faces, a facial recognition programmer works, then more important parts of the faces, and finally, the overall **representations** of faces the software trains itself over time, and the likelihood of correct answers increases. In this situation, with time, the facial recognition software can recognized faces correctly.

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