LSTNet Implementation #625

Job	Run time
test (ubuntu-latest, 3.10, jax)	1m 58s
test (ubuntu-latest, 3.10, tensorflow)	2m 34s
test (ubuntu-latest, 3.10, torch)	2m 29s
test (ubuntu-latest, 3.11, jax)	2m 5s
test (ubuntu-latest, 3.11, tensorflow)	2m 39s
test (ubuntu-latest, 3.11, torch)	2m 25s
test (windows-latest, 3.10, jax)	6m 45s
test (windows-latest, 3.10, tensorflow)	7m 34s
test (windows-latest, 3.10, torch)	8m 21s
test (windows-latest, 3.11, jax)	6m 7s
test (windows-latest, 3.11, tensorflow)	7m 58s
test (windows-latest, 3.11, torch)	6m 22s
	57m 17s

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