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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 the output layer is also parameterized). CAPs describe potentially causal connections between input and output. The CAP is the chain of transformations from input to output. More precisely, deep learning systems have a substantial credit assignment path (CAP) depth. The word "deep" in "deep learning" refers to the number of layers through which the data is transformed. This does not completely eliminate the need for hand-tuning for example, varying numbers of layers and layer sizes can provide different degrees of abstraction. Importantly, a deep learning process can learn which features to optimally place in which level on its own. In an image recognition application, the raw input may be a matrix of pixels the first representational layer may abstract the pixels and encode edges 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.
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In deep learning, each level learns to transform its input data into a slightly more abstract and composite representation. Most modern deep learning models are based on artificial neural networks, specifically convolutional neural networks (CNN)s, although they can also include propositional formulas or latent variables organized layer-wise in deep generative models such as the nodes in deep belief networks and deep Boltzmann machines. For example, in image processing, lower layers may identify edges, while higher layers may identify the concepts relevant to a human such as digits or letters or faces. Representing Images on Multiple Layers of Abstraction in Deep Learning ĭeep learning is a class of machine learning algorithms that : 199–200 uses multiple layers to progressively extract higher-level features from the raw input. In deep learning the layers are also permitted to be heterogeneous and to deviate widely from biologically informed connectionist models, for the sake of efficiency, trainability and understandability, whence the "structured" part. Deep learning is a modern variation which is concerned with an unbounded number of layers of bounded size, which permits practical application and optimized implementation, while retaining theoretical universality under mild conditions. Early work showed that a linear perceptron cannot be a universal classifier, but that a network with a nonpolynomial activation function with one hidden layer of unbounded width can. The adjective "deep" in deep learning refers to the use of multiple layers in the network. Specifically, artificial neural networks tend to be static and symbolic, while the biological brain of most living organisms is dynamic (plastic) and analogue. ANNs have various differences from biological brains. Īrtificial neural networks (ANNs) were inspired by information processing and distributed communication nodes in biological systems. ĭeep-learning architectures such as deep neural networks, deep belief networks, deep reinforcement learning, recurrent neural networks and convolutional neural networks have been applied to fields including computer vision, speech recognition, natural language processing, machine translation, bioinformatics, drug design, medical image analysis, material inspection and board game programs, where they have produced results comparable to and in some cases surpassing human expert performance. Learning can be supervised, semi-supervised or unsupervised. Deep learning (also known as deep structured learning) is part of a broader family of machine learning methods based on artificial neural networks with representation learning.