code: def test_dense_no_bounds(self):
      for lsq_solver in self.lsq_solvers:
          res = lsq_linear(
              A, b, method=self.method, lsq_solver=lsq_solver
          )
          assert_allclose(res.x, lstsq(A, b, rcond=-1)[0])
  
imports: import numpy
  from numpy.linalg import lstsq
  from numpy.testing import assert_allclose, assert_equal, assert_
  from scipy.sparse import rand
  from scipy.sparse.linalg import aslinearoperator
  from scipy.optimize import lsq_linear
  import pytest
label_desc: Use image node_id 2 for calling the BaseMixin obj's underlying member method code with example usage: obj.test_dense_no_bounds() without return types