code: def transform_params(self, unconstrained):
      return unconstrained**2
  
file_path: statsmodels/examples/python/statespace_local_linear_trend.py
imports: import numpy
  import pandas
  from scipy.stats import norm
  import statsmodels.api
  import matplotlib.pyplot
  import requests
  from io import BytesIO
  from zipfile import ZipFile
label_desc: Use image node_id 4 for calling the LocalLinearTrend obj's underlying member method code with example usage: obj.transform_params(unconstrained) and returns: unknown