tensorflow/tensorboard 2.5.0 on GitHub

Features

New data loading mode: typically loads between 100× and 350× faster
- On by default when applicable; pass --load_fast false to disable
- For details, or to provide feedback, see #4784
Time Series
- Improved line charts with GPU acceleration (#4695)
  - On by default; use ?fastChart=false to fallback to the older version. Please give us feedback before you use the fallback mechanism.
  - Support manual extent changes (#4711)
- Monotonic option for "zigzag" charts (#4696)
Graphs
- Added toggle to disable high-degree node extraction (#4722)
- "Color by structure" is now opt-in for large graphs; improves load performance by up to 77% in some cases (#4742)
- Combine graph by prefixing with unique name (#4334)
Text
- Support fenced code blocks in Markdown (#4585)
Histograms
- Most recent step gets the most salient color. (#4374)
Support http server port reuse (#4616) – thanks @zuston.

Graphs
- Fixed "Download as PNG" button (#4759)
- Fixed "Ungroup this series" button (#4817)
- Now collapses more series (abc1, abc2, …, abc5 → abc[1-5]) (#4803)
Core
- Removed scrollbars on no data views for plugins (#4525)
- Error message is JS is disabled (#4401)
Projector: fix the KNN algorithm caused projections to be incorrect. (#4687)
Windows: fixed the issue where TensorBoard notebook magic would hang when first launched (#4407, #4300)
Time series: Time axis on scalar chart read walltime incorrectly (#4541)
Graph events inconsistently evicted after session log START event (#4743)

Projector plugin will not work with --logdir_spec (#4494) (may not have worked before)
Drop support for negative --reload_interval, which instructed TensorBoard to not read any data at all