How to implement Multiplex Heterogenous Network Embedding in DMGI approach?

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Dear developers, I am trying to apply the DMGI example code on my own dataset, but my dataset is a multiplex heterogenous network (I learned this terminology from this paper, which I believe refers to various relations between two connected nodes.). In my case, I have firms and directors as nodes, the relations between two firm nodes can be various (supplier, competitors, or customers). I read from Table 5 that DMGI can deal with multiplex network structure, but I am not sure how to add the relationships as metapaths (line 19-23 in the official DMGI code) and implement DMGI algorithms? Thank you very much!