[Eager]Switch new Eager mode (#40990)

* [Eager]Switch new Eager mode

* switch into eager

* fix typo

python/paddle/fluid/tests/unittests/dygraph_to_static/test_ptb_lm.py

@@ -314,4 +314,6 @@ class TestPtb(unittest.TestCase):
 
 
 if __name__ == '__main__':
-    unittest.main()
+    # switch into new eager mode
+    with fluid.framework._test_eager_guard():
+        unittest.main()

python/paddle/fluid/tests/unittests/dygraph_to_static/test_resnet.py

@@ -366,4 +366,6 @@ class TestResnet(unittest.TestCase):
 
 
 if __name__ == '__main__':
-    unittest.main()
+    # switch into new eager mode
+    with fluid.framework._test_eager_guard():
+        unittest.main()

python/paddle/fluid/tests/unittests/dygraph_to_static/test_se_resnet.py

@@ -505,4 +505,6 @@ class TestSeResnet(unittest.TestCase):
 
 
 if __name__ == '__main__':
-    unittest.main()
+    # switch into new eager mode
+    with fluid.framework._test_eager_guard():
+        unittest.main()

python/paddle/fluid/tests/unittests/dygraph_to_static/test_seq2seq.py

@@ -203,4 +203,6 @@ class TestSeq2seq(unittest.TestCase):
 
 
 if __name__ == '__main__':
-    unittest.main()
+    # switch into new eager mode
+    with fluid.framework._test_eager_guard():
+        unittest.main()

python/paddle/fluid/tests/unittests/dygraph_to_static/test_simnet.py

@@ -170,4 +170,6 @@ class TestSimnet(unittest.TestCase):
 
 
 if __name__ == '__main__':
-    unittest.main()
+    # switch into new eager mode
+    with fluid.framework._test_eager_guard():
+        unittest.main()

python/paddle/fluid/tests/unittests/dygraph_to_static/test_transformer.py

@@ -402,4 +402,6 @@ class TestTransformer(unittest.TestCase):
 
 
 if __name__ == '__main__':
-    unittest.main()
+    # switch into new eager mode
+    with fluid.framework._test_eager_guard():
+        unittest.main()

python/paddle/fluid/tests/unittests/dygraph_to_static/test_tsm.py

@@ -347,4 +347,6 @@ class TestTsm(unittest.TestCase):
 
 
 if __name__ == '__main__':
-    unittest.main()
+    # switch into new eager mode
+    with fluid.framework._test_eager_guard():
+        unittest.main()