[Fix] Fix potential bug in using analyze_logs.py

[Wuziyi616]

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Motivation

A minor error when plotting eval results and interval == 1. If we abort training and then plot curve, the length of x-dim (epoch) and y-dim (some epoch) will be different.

Modification

Check if interval == 1.

BC-breaking (Optional)

No

Use cases (Optional)

N.A

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[codecov]

Codecov Report

Merging #720 (60f731d) into master (ea84601) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #720   +/-   ##
=======================================
  Coverage   48.92%   48.92%           
=======================================
  Files         208      208           
  Lines       15863    15863           
  Branches     2544     2544           
=======================================
  Hits         7761     7761           
  Misses       7607     7607           
  Partials      495      495           

Flag	Coverage Δ
unittests	48.92% <ø> (ø)

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