criterion = AbsCriterion()

Creates a criterion that measures the mean absolute value between n elements in the input x and output y:

loss(x,y) = 1/n \sum |x_i-y_i|.

If x and y are =d=-dimensional Tensors with a total of n elements, the sum operation still operates over all the elements, and divides by n.

The division by n can be avoided if one sets the internal variable sizeAverage to false: 

criterion = nn.AbsCriterion()
criterion.sizeAverage = false