code: def __init__(self) -> None:
      super().__init__()
      self.sigmoid = nn.Sigmoid()
  
file_path: BigDL/python/ppml/example/pytorch_nn_lr/pytorch_nn_lr_1.py
imports: import logging
  from typing import List
  import numpy
  import pandas
  import click
  import torch
  from torch import Tensor, nn
  from bigdl.ppml.fl.estimator import Estimator
  from bigdl.ppml.fl.nn.fl_context import init_fl_context
  from bigdl.ppml.fl.psi.psi_client import PSI
label_desc: Use image node_id 1 to create a new ServerModel object from inherited base classes: nn with example: obj = ServerModel()