Multi-dimensions padding layer.
This operation pads a tensor according to the paddings you specify. paddings is an integer tensor with shape [n-1, 2], where n is the rank of tensor. For each dimension D of input, paddings[D, 0] indicates how many values to add before the contents of tensor in that dimension, and paddings[D, 1] indicates how many values to add after the contents of tensor in that dimension. The first dimension corresponding to the batch size cannot be padded.