code: def __init__(self, raw_msg_dim: int, memory_dim: int, time_dim: int):
      super().__init__()
      self.out_channels = raw_msg_dim + 2 * memory_dim + time_dim
  
imports: import copy
  from typing import Callable, Dict, Tuple
  import torch
  from torch import Tensor
  from torch.nn import GRUCell, Linear
  from torch_geometric.nn.inits import zeros
  from torch_geometric.utils import scatter
  from torch_geometric.utils._scatter import scatter_argmax
label_desc: Use image node_id 1 to create a new IdentityMessage object from inherited base classes: torch.nn with example: obj = IdentityMessage(raw_msg_dim, memory_dim, time_dim)