code: def add_regularization(self):
      pass
  
imports: import numpy
  import torch
  import torch.nn
  from neuralprophet.components.trend import Trend
  from neuralprophet.utils_torch import init_parameter
label_desc: Use image node_id 4 for calling the PiecewiseLinearTrend obj's underlying member method code with example usage: obj.add_regularization() without return types