docstr: Forward restricted to the i-th model only.
docstr_tok: ["Forward","restricted","to","the","i-th","model","only","."]
code: def forward_i(self, i, *args, **kwargs):
      """Forward restricted to the i-th model only."""
      raise NotImplementedError
  
imports: from abc import ABC
  import torch
  from torch.nn import ModuleList
  from gpytorch.likelihoods import LikelihoodList
  from gpytorch.models import GP
  from gpytorch.utils.generic import length_safe_zip
label_desc: Use image node_id 1 for calling the AbstractModelList obj's underlying member method code with example usage: obj.forward_i(i) without return types