Cherrypick Fix nightly large_vector test caused by incorrect with_seed path (#18178)

ci/docker/install/requirements

@@ -27,7 +27,8 @@ mock==2.0.0
 nose==1.3.7
 nose-timer==0.7.3
 numpy>1.16.0,<2.0.0
-pylint==2.3.1; python_version >= '3.0'
+pylint==2.3.1  # pylint and astroid need to be aligned
+astroid==2.3.3  # pylint and astroid need to be aligned
 requests<2.19.0,>=2.18.4
 scipy==1.2.1
 six==1.11.0

tests/nightly/test_large_array.py

@@ -27,7 +27,7 @@
 
 from mxnet.test_utils import rand_ndarray, assert_almost_equal, rand_coord_2d, default_context, check_symbolic_forward, create_2d_tensor
 from mxnet import gluon, nd
-from common import with_seed, with_post_test_cleanup
+from common import with_seed
 from nose.tools import with_setup
 import unittest
 

tests/nightly/test_large_vector.py

@@ -27,7 +27,7 @@
 
 from mxnet.test_utils import rand_ndarray, assert_almost_equal, rand_coord_2d, create_vector
 from mxnet import gluon, nd
-from tests.python.unittest.common import with_seed
+from common import with_seed
 from nose.tools import with_setup
 import unittest
 

tests/python/unittest/common.py

@@ -310,27 +310,6 @@ def teardown():
     mx.nd.waitall()
 
 
-def with_post_test_cleanup():
-    """
-    Helper function that cleans up memory by releasing it from memory pool
-    Required especially by large tensor tests that have memory footprints in GBs.
-    """
-    def test_helper(orig_test):
-        @make_decorator(orig_test)
-        def test_new(*args, **kwargs):
-            logger = default_logger()
-            try:
-                orig_test(*args, **kwargs)
-            except:
-                logger.info(test_msg)
-                raise
-            finally:
-                mx.nd.waitall()
-                mx.cpu().empty_cache()
-        return test_new
-    return test_helper
-
-
 def run_in_spawned_process(func, env, *args):
     """
     Helper function to run a test in its own process.
@@ -373,4 +352,4 @@ def run_in_spawned_process(func, env, *args):
         finally:
             os.environ.clear()
             os.environ.update(orig_environ)
-    return True
+    return True