The right Loss Function? [PyTorch]

Loss Functions are one of the most important parts of Neural Network design. A loss function helps us to interact with the model and tell the model what we want -- the reason why it is related to an "objective function". Let us look at the precise definition of a loss function. In mathematical optimization and decision theory, a loss function or cost function is a function that maps an event or values of one or more variables onto a real number intuitively representing some "cost" associated with the event. An optimization problem seeks to minimize a loss function.