When testing my model with tools/test.py, my config will be messed up by the "--save-preds" option.

Motivation

To improve the test tool, when testing model with tools/test.py and "--save-preds" option.

Modification

When the test_evaluator config is a dict and --save-preds is in tools/test.py's option, the runner cannot correctly buid the evaluator.For example: My config file

test_evaluator = dict(
    type='MultiDatasetsEvaluator',
    metrics=[
        dict(
            type='WordMetric',
            mode=['exact', 'ignore_case', 'ignore_case_symbol']),
        dict(type='CharMetric')
    ],
    dataset_prefixes=None)

My test script

python tools/test.py \
work_dirs/master_resnet31_12e.py \
work_dirs/best_ocr_rec_1_recog_char_f1_epoch_980.pth \
--save-preds

the --save-preds option will concat the evaluator with a DumpResults instance in a wrong way,the new evaluator is like:

test_evaluator = [
dict(type='MultiDatasetsEvaluator',
    metrics=[
        dict(
            type='WordMetric',
            mode=['exact', 'ignore_case', 'ignore_case_symbol']),
        dict(type='CharMetric')
    ],
    dataset_prefixes=None),
dict(
    type='DumpResults',
    out_file_path='my_work_dir')
]

This new test_evaluator cannot be built by program.

After updating the tools/test.py, using the same config and test scripts, the new test_evaluator will be:

test_evaluator = [
dict(type='MultiDatasetsEvaluator',
    metrics=[
        dict(
            type='WordMetric',
            mode=['exact', 'ignore_case', 'ignore_case_symbol']),
        dict(type='CharMetric'),
        dict(
            type='DumpResults',
            out_file_path='my_work_dir')
    ],
    dataset_prefixes=None)
]

This new test_evaluator can be built correctly by program.

Checklist

Before PR:

[x] I have read and followed the workflow indicated in the CONTRIBUTING.md to create this PR.
[x] Pre-commit or linting tools indicated in CONTRIBUTING.md are used to fix the potential lint issues.
[x] Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
[x] New functionalities are covered by complete unit tests. If not, please add more unit test to ensure the correctness.
[x] The documentation has been modified accordingly, including docstring or example tutorials.

After PR:

[x] If the modification has potential influence on downstream or other related projects, this PR should be tested with some of those projects.
[x] CLA has been signed and all committers have signed the CLA in this PR.

open-mmlab / mmocr