code: def forward(self, x):
      x = self.dense(x)
      return x
  
file_path: BigDL/python/ppml/example/pytorch_nn_lr/pytorch_nn_lr_2.py
imports: import logging
  import numpy
  import pandas
  import click
  import torch
  from torch import 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 2 for calling the LocalModel obj's underlying member method code with example usage: obj.forward(x) and returns: x