Add masked LSTM support #66

Job	Run time
Extra_tests (py38-tf2.13, ubuntu-latest, 18, 1.16.3, 1.16.1, False)	10m 31s
Test_max_py_with_latest_tf	10m 28s
Extra_tests (py38-tf2.13, ubuntu-latest, 15, 1.16.3, 1.16.1, False)	10m 12s
Extra_tests (py38-tf2.13, windows-2022, 18, 1.16.3, 1.16.1, False)	12m 24s
Test_min_py_with_min_tf	10m 0s
Extra_tests (py38-tf2.13, windows-2022, 15, 1.16.3, 1.16.1, False)	13m 11s
Extra_tests (py39-tf2.15, ubuntu-latest, 18, 1.16.3, 1.16.1, False)	10m 1s
Extra_tests (py39-tf2.15, ubuntu-latest, 15, 1.16.3, 1.16.1, False)	9m 48s
Extra_tests (py39-tf2.15, windows-2022, 18, 1.16.3, 1.16.1, False)	13m 43s
Extra_tests (py39-tf2.15, windows-2022, 15, 1.16.3, 1.16.1, False)	12m 38s
Extra_tests (py37-tf1.15, ubuntu-22.04, 15, 1.14.1, 1.14.1, True, 1.15.5, 3.7)	3m 23s
Publish Tests Results to Github	10s
	1h 56m 29s

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