Added missing batch.pt file for functorch_maml_omniglot

[JasonMts]

functorch_maml_omniglot tries to load some inputs from a file that it has not downloaded in its install.py. This should be done similarly to how it's done for maml_omniglot.

Testing before:

FileNotFoundError: [Errno 2] No such file or directory: 'benchmark/torchbenchmark/models/maml_omniglot/batch.pt'

(...)

benchmark/components/_impl/workers/subprocess_rpc.py:458: FileNotFoundError
========================================================================= short test summary info ==========================================================================
FAILED benchmark/test.py::TestBenchmark::test_functorch_maml_omniglot_check_device_cpu - FileNotFoundError: [Errno 2] No such file or directory
FAILED benchmark/test.py::TestBenchmark::test_functorch_maml_omniglot_eval_cpu - FileNotFoundError: [Errno 2] No such file or directory
FAILED benchmark/test.py::TestBenchmark::test_functorch_maml_omniglot_example_cpu - FileNotFoundError: [Errno 2] No such file or directory
FAILED benchmark/test.py::TestBenchmark::test_functorch_maml_omniglot_train_cpu - FileNotFoundError: [Errno 2] No such file or directory

and afterwards:

==================================================================== 4 passed, 384 deselected in 12.55s ====================================================================

[xuzhao9]

LGTM, thanks!

[facebook-github-bot]

@xuzhao9 has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@xuzhao9 merged this pull request in a005ea8.