Returns the normalized input. Tree different types of normalization can be performed and are defined as follow : MAX: $Y = \frac{X}{max(X)}$ L1: $Y = \frac{X}{sum(X)}$ L2: $Y = \frac{X}\sqrt{{sum(X²)}}$ For batches, that is, [N,C] tensors, normalization is done along the C axis. In other words, each row of the batch is normalized independently.