Review nn/simplicial models

[levtelyatnikov]

Review the model implementations and make sure they converge properly on real-world datasets.

• [x] Dist2Cycle
• [x] HSN
• [x] SAN
• [ ] SCA_CMPS
• [x] SCCN
• [x] SCCNN
• [x] SCN2
• [ ] SCConv
• [x] SCNN
• [x] SCoNe