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Deep learning, a subset of machine learning, relies on neural networks with multiple layers to model complex patterns in data. At its core is the artificial neural network (ANN), inspired by biological neurons, which processes inputs through layered computations to produce meaningful outputs. Structure of a Neural Network A typical feedforward ...

Cost Function for Neural Networks The cost function for a neural network extends the logistic regression cost to handle multiple output units. Define: (L): total number of layers (s_l): number of units (excluding bias) in layer (l) (K): number of output units (classes) For a binary classification (K=1), the hypothesis (h_\Theta(x)) is a scala ...