Seeking favor on coordinate transoforming codes

[hewg2008]

Dear Ph.D. Linfeng Zhang,

I am deeply impressed by your local coordinates functions for transforming raw coordinates of atoms to the input vectors which keep all necessary symmetries of the system.
Herein I take the liberty to ask whether you could kindly provide me the Python codes of this transformation program. Or could you kindly provide a tutorial of making transformation from scratch which can be followed by non-researchers？Let us say from a molecule like C6H6.

And also I wonder do you have a simpler version of your DeepMD series models like in Keras, or Pytorch?

Thank you in advance for your kind favor.