About curvature in class DyERNIE_P

[seeyourmind]

I get the error Exception has occurred: TypeError must be real number, not NoneType because self.curvature is None when $curvature \le 0$, (but default values are all negative)

the code: https://github.com/TemporalKGTeam/DyERNIE/blob/35b45b9b32436981425e0a842d996ee9ea6bf4a5/model.py#LL14C19-L14C19