[Fix] Fixed device_id in tools/test.py for the CPU.

[SemyonBevzuk]

Motivation

It was found that tools/test.py with argument --device cpu crashes with the following error:

2022-01-11 01:45:25,318 - mmdeploy - INFO - Successfully loaded onnxruntime custom ops from             /home/sbevzyuk/mmdeployment_dir/MMDeploy/build/lib/libmmdeploy_onnxruntime_ops.so
Traceback (most recent call last):
  File "/home/sbevzyuk/mmdeployment_dir/MMDeploy/tools/test.py", line 141, in <module>
    main()
  File "/home/sbevzyuk/mmdeployment_dir/MMDeploy/tools/test.py", line 112, in main
    model = MMDataParallel(model, device_ids=[device_id])
  File "/home/sbevzyuk/anaconda3/envs/mmdeployment/lib/python3.7/site-packages/mmcv/parallel/data_parallel.py", line 35, in __init__
    super(MMDataParallel, self).__init__(*args, dim=dim, **kwargs)
  File "/home/sbevzyuk/anaconda3/envs/mmdeployment/lib/python3.7/site-packages/torch/nn/parallel/data_parallel.py", line 140, in __init__
    self.src_device_obj = torch.device(device_type, self.device_ids[0])
RuntimeError: Device index must not be negative`

This PR proposes a fix for this problem.

Modification

• mmdeploy/backend/openvino/wrapper.py: Fixed work with the dictionary for Python 3.8.
• mmdeploy/utils/device.py: The documentation of the parse_device_id function was updated.
• tests/test_utils/test_util.py: Added tests for function parse_device_id.
• tools/test.py: Added fix for cpu.

[codecov]

Codecov Report

Merging #58 (d5f463d) into master (fbce75e) will increase coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
+ Coverage   67.46%   67.60%   +0.13%     
==========================================
  Files         173      173              
  Lines        5733     5735       +2     
  Branches      910      910              
==========================================
+ Hits         3868     3877       +9     
+ Misses       1583     1578       -5     
+ Partials      282      280       -2     

Flag	Coverage Δ
unittests	67.60% <100.00%> (+0.13%)	⬆️

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Impacted Files	Coverage Δ
mmdeploy/backend/openvino/wrapper.py	100.00% <100.00%> (ø)
mmdeploy/utils/device.py	100.00% <100.00%> (+53.84%)	⬆️

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[AllentDan]

LGTM

[grimoire]

LGTM

[RunningLeon]

LGTM