class_docstr_tok: []
code: def empty_feature(self, num_nodes):
      return torch.zeros([num_nodes, 0])
  
imports: import torch
  import torch.nn
  import torch.nn.functional
  from torch_geometric.nn.conv import MessagePassing
  from torch_geometric.utils import degree, remove_self_loops, add_self_loops
label_desc: Use image node_id 6 for calling the FeatureExpander obj's underlying member method code with example usage: obj.empty_feature(num_nodes) and returns: torch