Refine data model doc

[lihuoran]

Description

Linked issue(s)/Pull request(s)

• issue_number

Type of Change

• [ ] Non-breaking bug fix
• [ ] Breaking bug fix
• [ ] New feature
• [ ] Test
• [ ] Doc update
• [ ] Docker update

Related Component

• [ ] Simulation toolkit
• [ ] RL toolkit
• [ ] Distributed toolkit

Has Been Tested

• OS:
  • [ ] Windows
  • [ ] Mac OS
  • [ ] Linux
• Python version:
  • [ ] 3.7
  • [ ] 3.8
  • [ ] 3.9
• Key information snapshot(s):

Needs Follow Up Actions

• [ ] New release package
• [ ] New docker image

Checklist

• [ ] Add/update the related comments
• [ ] Add/update the related tests
• [ ] Add/update the related documentations
• [ ] Update the dependent downstream modules usage

[codecov[bot]]

Codecov Report

Merging #554 (d702bcc) into v0.3 (ed951f0) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             v0.3     #554   +/-   ##
=======================================
  Coverage   78.90%   78.90%           
=======================================
  Files          85       85           
  Lines        5455     5455           
=======================================
  Hits         4304     4304           
  Misses       1151     1151           

Flag	Coverage Δ
unittests	78.90% <ø> (ø)

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