Alternatives to Gram Matrix for Neural Style Transfer?

The paper which introduced Neural Style Transfer ([https://www.cv-foundation.org/openaccess/content\_cvpr\_2016/papers/Gatys\_Image\_Style\_Transfer\_CVPR\_2016\_paper.pdf](https://www.cv-foundation.org/openaccess/content_cvpr_2016/papers/Gatys_Image_Style_Transfer_CVPR_2016_paper.pdf)) uses a Gram matrix for capturing style information in images. Are there alternatives to the Gram matrix that works on a similar principle?

deeplearning style transfer transfer