code: def test_lstsq_solutions(self):
      # Comapres numpy.linalg.lstsq and cupy.linalg.lstsq solutions for:
      #   a shapes range from (3, 3) to (5, 3) and (3, 5)
      #   b shapes range from (i, 3) to (i, )
      #   sets a random seed for deterministic testing
      for i in range(3, 6):
          for j in range(3, 6):
              for k in range(2, 4):
                  seed = i + j + k
                  # check when b has shape (i, k)
                  self.check_lstsq_solution(
                      (i, j), (i, k), seed, rcond=-1
                  )
                  self.check_lstsq_solution(
                      (i, j), (i, k), seed, rcond=None
                  )
                  self.check_lstsq_solution(
                      (i, j), (i, k), seed, rcond=0.5
                  )
                  self.check_lstsq_solution(
                      (i, j), (i, k), seed, rcond=1e-6, singular=True
                  )
              # check when b has shape (i, )
              self.check_lstsq_solution(
                  (i, j), (i,), seed + 1, rcond=-1
              )
              self.check_lstsq_solution(
                  (i, j), (i,), seed + 1, rcond=None
              )
              self.check_lstsq_solution(
                  (i, j), (i,), seed + 1, rcond=0.5
              )
              self.check_lstsq_solution(
                  (i, j), (i,), seed + 1, rcond=1e-6, singular=True
              )
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
  from cupy.testing import _condition
  import cupyx
  from cupy.cublas import get_batched_gesv_limit, set_batched_gesv_limit
label_desc: Use image node_id 3 for calling the TestLstsq obj's underlying member method code with example usage: obj.test_lstsq_solutions() without return types