docstr: ...Test LinearRegression setting of step parameter of solver
          
docstr_tok: ["...","Test","LinearRegression","setting","of","step","parameter","of","solver"]
code: def test_LinearRegression_solver_step(self):
      """...Test LinearRegression setting of step parameter of solver"""
      for solver in LinearRegression._solvers.keys():
          learner = LinearRegression(
              solver=solver,
              step=self.float_1,
              **Test.specific_solver_kwargs(solver),
          )
          self.assertEqual(learner.step, self.float_1)
          self.assertEqual(learner._solver_obj.step, self.float_1)
          learner.step = self.float_2
          self.assertEqual(learner.step, self.float_2)
          self.assertEqual(learner._solver_obj.step, self.float_2)
  
imports: import itertools
  import unittest
  from itertools import product
  import numpy
  from scipy.linalg import norm
  from tick.base.inference import InferenceTest
  from tick.linear_model import SimuLinReg, LinearRegression
  from tick.simulation import weights_sparse_gauss
label_desc: Use image node_id 11 for calling the Test obj's underlying member method code with example usage: obj.test_LinearRegression_solver_step() without return types