Sigmoid
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The Sigmoid function is any mathematical function whose graph has a characteristic 'S', or 'sigmoid' shape. Sigmoid functions are also used in artificial neural networks. They can be used to convert any input value into a value between 0 and 1. This is useful for converting complicated inputs into simple 'yes or no' outputs. The term 'sigmoid function' is sometimes used to describe a logistic function. Logistic functions are a type of sigmoid function, but there are other types of sigmoids that are not logistic.