Add maximum selection for ExplorationReportTrustLevels

[Angel-Jia]

If the number of candidates is larger than max_nframes, then select max_nframes frames with the largest max_devi_f from the candidates.

[codecov-commenter]

Codecov Report

Base: 87.73% // Head: 87.81% // Increases project coverage by +0.07% :tada:

Coverage data is based on head (8c811b8) compared to base (b269f70). Patch coverage: 95.31% of modified lines in pull request are covered.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #144 +/- ## ========================================== + Coverage 87.73% 87.81% +0.07% ========================================== Files 77 79 +2 Lines 3703 3749 +46 ========================================== + Hits 3249 3292 +43 - Misses 454 457 +3 ``` | [Impacted Files](https://codecov.io/gh/deepmodeling/dpgen2/pull/144?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling) | Coverage Δ | | |---|---|---| | [dpgen2/entrypoint/submit.py](https://codecov.io/gh/deepmodeling/dpgen2/pull/144?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling#diff-ZHBnZW4yL2VudHJ5cG9pbnQvc3VibWl0LnB5) | `70.49% <ø> (ø)` | | | [...en2/exploration/report/report\_trust\_levels\_base.py](https://codecov.io/gh/deepmodeling/dpgen2/pull/144?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling#diff-ZHBnZW4yL2V4cGxvcmF0aW9uL3JlcG9ydC9yZXBvcnRfdHJ1c3RfbGV2ZWxzX2Jhc2UucHk=) | `96.49% <60.00%> (ø)` | | | [...gen2/exploration/report/report\_trust\_levels\_max.py](https://codecov.io/gh/deepmodeling/dpgen2/pull/144?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling#diff-ZHBnZW4yL2V4cGxvcmF0aW9uL3JlcG9ydC9yZXBvcnRfdHJ1c3RfbGV2ZWxzX21heC5weQ==) | `96.55% <96.55%> (ø)` | | | [dpgen2/exploration/report/\_\_init\_\_.py](https://codecov.io/gh/deepmodeling/dpgen2/pull/144?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling#diff-ZHBnZW4yL2V4cGxvcmF0aW9uL3JlcG9ydC9fX2luaXRfXy5weQ==) | `100.00% <100.00%> (ø)` | | | [...2/exploration/report/report\_trust\_levels\_random.py](https://codecov.io/gh/deepmodeling/dpgen2/pull/144?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling#diff-ZHBnZW4yL2V4cGxvcmF0aW9uL3JlcG9ydC9yZXBvcnRfdHJ1c3RfbGV2ZWxzX3JhbmRvbS5weQ==) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepmodeling)

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