Created by: nhanvtran
1D: https://github.com/keras-team/keras/blob/master/keras/layers/pooling.py#L57 2D: https://github.com/keras-team/keras/blob/master/keras/layers/pooling.py#L170 3D: https://github.com/keras-team/keras/blob/master/keras/layers/pooling.py#L339