Criterion

The Criterion is an abstract class which declares methods defined in all criterions. Like most things in torch, this class is serializable.

[output] forward(input, target)

Given an input and a target, compute the loss function associated to the criterion and return the result. In general input and target are tensors, but some specific criterions might require some other type of object.

The output returned should be a scalar in general.

The state variable self.output should be updated after a call to forward().

[gradInput] backward(input, target)

Given an input and a target, compute the gradients of the loss function associated to the criterion and return the result.In general input, target and gradInput are tensors, but some specific criterions might require some other type of object.

The state variable self.gradInput should be updated after a call to backward().

State variable: output

State variable which contains the result of the last forward(input, target) call.

State variable: gradInput

State variable which contains the result of the last backward(input, target) call.