code: def forward(self, x, rbf, i, j):
      x = self.emb(x)
      rbf0 = self.act(self.lin_rbf_0(rbf))
      e1 = self.act(self.lin(torch.cat([x[i], x[j], rbf0], dim=-1)))
      e2 = self.lin_rbf_1(rbf) * e1
  
      return (e1, e2), x
  
imports: import torch
  from torch import nn
  from torch.nn import Linear, Embedding
  from torch_geometric.nn.inits import glorot_orthogonal
  from torch_geometric.nn import radius_graph
  from torch_scatter import scatter
  import torch.nn.functional
  from math import sqrt
  from .geometric_computing import xyztodat
  from .features import dist_emb, angle_emb, torsion_emb
label_desc: Use image node_id 3 for calling the init obj's underlying member method code with example usage: obj.forward(x, rbf, i, j) and returns: e1,  e2,  x