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What is the main role of an activation function in a neural network?

Answer and explanation

Correct answer: To introduce nonlinearity into the neural network

An activation function transforms the weighted input of a neuron and introduces nonlinearity. Without it, several stacked layers would behave like one linear transformation and could not represent many complex patterns. Functions such as ReLU, sigmoid, and tanh serve this role. Normalization prepares data, backpropagation updates weights, and a loss function measures error, so option A is correct.

Related tags

Activation FunctionNeural NetworksNonlinearityDeep LearningClass 12 AiUnit 6: Understanding Neural NetworksUnit 6 Understanding Neural NetworksPart B: Subject Specific Skills

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