code: def message(self, edge_attr: Tensor) -> Tensor:
      return edge_attr
  
imports: import copy
  from typing import Tuple, Union
  import pytest
  import torch
  from torch import Tensor
  from torch.nn import Linear
  import torch_geometric.typing
  from torch_geometric.nn import MessagePassing, aggr
  from torch_geometric.typing import Adj, OptPairTensor, OptTensor, Size, SparseTensor
  from torch_geometric.utils import add_self_loops, scatter, spmm, to_torch_csc_tensor
label_desc: Use image node_id 4 for calling the MyEdgeConv obj's underlying member method code with example usage: obj.message(edge_attr) and returns: edge_attr