docstr: Common setup.
docstr_tok: ["Common","setup","."]
code: def setup_method(self):
      """Common setup."""
      self.x = np.linspace(-5, 5, 30)[:, None]
      self.xu = np.linspace(-5, 5, 10)[:, None]
      self.y = np.random.normal(0.25 * self.x, 0.1)
  
      with pm.Model() as self.model:
          cov_func = pm.gp.cov.Linear(1, c=0.0)
          c = pm.Normal("c", mu=20.0, sigma=100.0)
          mean_func = pm.gp.mean.Constant(c)
          self.gp = self.gp_implementation(
              mean_func=mean_func, cov_func=cov_func
          )
          self.sigma = pm.HalfNormal("sigma", sigma=100)
  
imports: from functools import reduce
  from operator import add
  import numpy
  import numpy.testing
  import pytest
  import pymc
  from pymc.math import cartesian
label_desc: Use image node_id 1 for calling the TestSigmaParams obj's underlying member method code with example usage: obj.setup_method() without return types