code: def train(self: T, mode: bool = True) -> T:
      self.training = mode
      return self
  
imports: import torch
  from typing import List, Literal
  import torch
  from fate.arch import Context
  from torch.nn.modules.module import T
label_desc: Use image node_id 11 for calling the _AggLayerBase obj's underlying member method code with example usage: obj.train(mode) and returns: self