Change the way to validate keep_num_dims attribute for new tf. (#2367) #25

Job	Run time
Extra_tests (py38-tf2.13, ubuntu-latest, 18, 1.16.3, 1.16.1, False)	9m 56s
Test_max_py_with_latest_tf	9m 25s
Extra_tests (py38-tf2.13, ubuntu-latest, 15, 1.16.3, 1.16.1, False)	9m 40s
Test_min_py_with_min_tf	9m 35s
Extra_tests (py38-tf2.13, windows-2022, 18, 1.16.3, 1.16.1, False)	13m 29s
Extra_tests (py38-tf2.13, windows-2022, 15, 1.16.3, 1.16.1, False)	12m 33s
Extra_tests (py39-tf2.15, ubuntu-latest, 18, 1.16.3, 1.16.1, False)	9m 46s
Extra_tests (py39-tf2.15, ubuntu-latest, 15, 1.16.3, 1.16.1, False)	9m 56s
Extra_tests (py39-tf2.15, windows-2022, 18, 1.16.3, 1.16.1, False)	14m 23s
Extra_tests (py39-tf2.15, windows-2022, 15, 1.16.3, 1.16.1, False)	13m 5s
Extra_tests (py37-tf1.15, ubuntu-latest, 15, 1.14.1, 1.14.1, True, 1.15.5, 3.7)	3m 4s
Publish Tests Results to Github	11s
	1h 55m 3s

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