[Fix] tools/classification/test.py bug

[hugh-98]

trafficstars

Motivation

When run the following command according to document, a error (AttributeError: 'Namespace' object has no attribute 'out') will be reported.

python ./tools/classification/test.py \
  configs/classification/baseline/cub/baseline_conv4_1xb64_cub_5way-1shot.py \
  checkpoints/SOME_CHECKPOINT.pth

Modification

replace args.out with args.work_dir

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[BIGWangYuDong]

LGTM

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