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The sigmoid function is used because it ranges between 0 and 1.

Sigmoid advantage is that it gives output which lies between 0 and 1 so we can we use it when even we need to predict the probability as probability always exists between (0, 1). There are two major disadvantages of using sigmoid activation function. One of them is that the outputs from the sigmoid are always not zero centered. The second one is the problem of gradients getting nearly 0. Please see Figure 1.3.