Refactor graph visualization

[zhiqwang]

No description provided.

[codecov]

Codecov Report

Merging #165 (a084845) into master (f8560bd) will not change coverage.
The diff coverage is n/a.

❗ Current head a084845 differs from pull request most recent head 796b100. Consider uploading reports for the commit 796b100 to get more accurate results

@@           Coverage Diff           @@
##           master     #165   +/-   ##
=======================================
  Coverage   96.20%   96.20%           
=======================================
  Files          10       10           
  Lines         553      553           
=======================================
  Hits          532      532           
  Misses         21       21           

Flag	Coverage Δ
unittests	96.20% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f8560bd...796b100. Read the comment docs.

[review-notebook-app]

Check out this pull request on 

See visual diffs & provide feedback on Jupyter Notebooks.

---

Powered by ReviewNB