[test] fixed torchrec model test

[FrankLeeeee]

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Fixed #3168

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This PR fixed the tests related to the torchrec model.

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[github-actions]

The code coverage for the changed files is 91%.

Click me to view the complete report

Name                                                                 Stmts   Miss  Cover
----------------------------------------------------------------------------------------
tests/kit/model_zoo/torchrec/torchrec.py                                37      0   100%
tests/test_fx/test_tracer/test_torchrec_model/test_deepfm_model.py      40      5    88%
tests/test_fx/test_tracer/test_torchrec_model/test_dlrm_model.py        42      6    86%
----------------------------------------------------------------------------------------
TOTAL                                                                  119     11    91%

[github-actions]

The code coverage for the changed files is 73%.

Click me to view the complete report

Name                                                                 Stmts   Miss  Cover
----------------------------------------------------------------------------------------
tests/kit/model_zoo/torchrec/torchrec.py                                37      0   100%
tests/test_booster/test_mixed_precision/test_fp16_torch.py              22      0   100%
tests/test_fx/test_tracer/test_torchrec_model/test_deepfm_model.py      38     28    26%
tests/test_fx/test_tracer/test_torchrec_model/test_dlrm_model.py        40     30    25%
tests/test_gemini/update/test_fwd_bwd.py                                83      1    99%
----------------------------------------------------------------------------------------
TOTAL                                                                  220     59    73%