code: def forward(self, t: Tensor) -> Tensor:
      return self.lin(t.view(-1, 1)).cos()
  
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 3 for calling the TimeEncoder obj's underlying member method code with example usage: obj.forward(t) and returns: self