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]

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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