title: Activation Function in Machine learning
body: <p>What is meant by Activation function in Machine learning. I go through with most of the articles and videos, everyone states or compare that with neural network. I'am a newbie to machine learning and not that much familiar with deep learning and neural networks. So, can any one explain me what exactly an Activation function is ? instead of explaining with neural networks. I struck with this ambiguity while I learning Sigmoid function for logistic regression.</p>