Fix failing uint4 test

[gau-nernst]

torch nightly CI is failing with the following error

  test/dtypes/test_uint4.py:12: in <module>
      from torch._export import dynamic_dim
  E   ImportError: cannot import name 'dynamic_dim' from 'torch._export' (/opt/conda/envs/venv/lib/python3.9/site-packages/torch/_export/__init__.py)

Turns out dynamic_dim is not used by the test, hence can be removed. I also remove other unused imports.

New error is due to this: pytorch/pytorch#129940. _convert_weight_to_int4pack inputs should be uint8 now. @jerryzh168 do you want to handle it instead? I'm not too familiar with that part of the code, afraid to break things. Might need to update the custom unpack kernel by @jeromeku also.

[pytorch-bot]

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❌ 2 New Failures

As of commit 98bcb6f with merge base 1029df3 ():

NEW FAILURES - The following jobs have failed:

• Run Regression Tests / test (CPU Nightly, linux.4xlarge, --pre torch --index-url https://download.pytorch.org/whl/nightl... / linux-job (gh)
  test/integration/test_integration.py::TestSaveLoadMeta::test_save_load_int4woqtensors_2_cpu
• Run Regression Tests / test (CUDA Nightly, linux.g5.12xlarge.nvidia.gpu, --pre torch --index-url https://download.pytorc... / linux-job (gh)
  test/quantization/test_quant_api.py::TestQuantFlow::test_quantized_tensor_subclass_int4

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[jerryzh168]

yeah I'll take a look at the failures

[gau-nernst]

Will be fixed by #504