harvard-edge/cs249r_book

Machine Learning Systems: Foundations, Scaling, Agentic AI, and Physical AI (Vols I–IV) • Harvard CS249r | https://mlsysbook.ai

29k stars · 3.6k forks · Python

Caution

Caution: one person wrote most of the recent commits.

Why

One person wrote 100% of human commits in the last year, so the project depends on them continuing. (source 1, source 2)

What would change this

A second person takes a substantial share of commits.
Partly checked: maintenance (Commit counts are estimated: the commit sample stops before the window start, so GitHub's totals were scaled by the sampled bot share.; Authors in the last 90 days are counted from the sampled commits only.)

Maintenance

Partial

Active

Human commits, 30 days: 2.7k
Human commits, 90 days: 5.2k
Human commits, 365 days: 16.1k
Bot share of commits, 365 days: 1%
Last commit: Oct 13, 2026 (1 day ago)
Last human commit: Oct 13, 2026 (1 day ago)
Authors, 90 days: 2
Last release: Oct 1, 2026 (13 days ago)
Median PR merge time: 23 hours

Responsiveness: of 14 recent issues, 100% got a maintainer reply. Median first response: 47 hours.

Commit counts are estimated: the commit sample stops before the window start, so GitHub's totals were scaled by the sampled bot share.
Authors in the last 90 days are counted from the sampled commits only.

Sources: Commits, Releases, Merged pull requests, Issues

People

Complete

Owner: Organization
Commits sampled: 494 since Oct 14, 2025
Authors for half of commits: 1
Authors for 80% of commits: 1
Contributors: 109

Top committers

profvjreddi: 100% of commits
Shashank-Tripathi-07: 0% of commits

Shares come from the newest sampled commits, since the commit sample is capped.

Sources: Commits, Contributors

Stars

Complete

Mostly organic, confidence high

Bars show stars gained each week. Orange bars overlap a burst.

Bursts

Dec 12, 2023 to Dec 17, 2023: about 97 more stars than usual, peak 38 in one day, a spike that tapers off. No outside explanation found, so this burst is unexplained.
Jun 19, 2024 to Jun 27, 2024: about 255 more stars than usual, peak 45 in one day, a spike that tapers off. No outside explanation found, so this burst is unexplained.
Jul 5, 2024 to Jul 11, 2024: about 101 more stars than usual, peak 30 in one day, a spike that tapers off. Outside explanation: a jump in forks.
Aug 30, 2024 to Aug 31, 2024: about 39 more stars than usual, peak 34 in one day, a spike that tapers off. Outside explanation: a jump in issues and pull requests.
Nov 19, 2024 to Nov 21, 2024: about 83 more stars than usual, peak 40 in one day, a spike that tapers off. Outside explanation: a jump in forks.
Apr 13, 2025 to Apr 14, 2025: about 37 more stars than usual, peak 27 in one day, a spike that tapers off. Outside explanation: a jump in forks.
Apr 17, 2025 to Apr 18, 2025: about 60 more stars than usual, peak 36 in one day, a spike that tapers off. Outside explanation: a jump in forks.
May 14, 2025 to May 14, 2025: about 18 more stars than usual, peak 20 in one day, a spike that tapers off. No outside explanation found, so this burst is unexplained.
Jun 10, 2025 to Jun 12, 2025: about 42 more stars than usual, peak 20 in one day, a spike that tapers off. Outside explanation: a jump in forks, a jump in issues and pull requests.
Sep 25, 2025 to Sep 26, 2025: about 60 more stars than usual, peak 44 in one day, a spike that tapers off. Outside explanation: a jump in forks.
Oct 12, 2025 to Oct 16, 2025: about 800 more stars than usual, peak 249 in one day, a spike that tapers off. Outside explanation: a jump in forks.
Oct 20, 2025 to Nov 4, 2025: about 4.6k more stars than usual, peak 913 in one day, a spike that tapers off. Outside explanation: a jump in forks.
Dec 30, 2025 to Jan 8, 2026: about 3.9k more stars than usual, peak 1.2k in one day, a spike that tapers off. Outside explanation: a jump in forks, a jump in issues and pull requests.
Feb 16, 2026 to Feb 26, 2026: about 2.4k more stars than usual, peak 652 in one day, a shape we can't classify. Outside explanation: a jump in forks, a jump in issues and pull requests.
May 2, 2026 to May 4, 2026: about 132 more stars than usual, peak 85 in one day, a spike that tapers off. Outside explanation: a jump in forks, a jump in issues and pull requests.
May 26, 2026 to Jun 1, 2026: about 324 more stars than usual, peak 97 in one day, a spike that tapers off. Outside explanation: a jump in issues and pull requests.
Jul 2, 2026 to Jul 10, 2026: about 2k more stars than usual, peak 644 in one day, a spike that tapers off. No outside explanation found, so this burst is unexplained.
Aug 6, 2026 to Aug 7, 2026: about 59 more stars than usual, peak 62 in one day, a spike that tapers off. Outside explanation: a jump in issues and pull requests.
Sep 27, 2026 to Sep 30, 2026: about 200 more stars than usual, peak 114 in one day, a spike that tapers off. No outside explanation found, so this burst is unexplained.

1 stars GitHub has since removed (tracked since Oct 14, 2026).

Anyone can buy stars for any repo; bursts alone don't prove the owner did.

Some star bursts have no matching forks, issues, releases, or launch coverage.
Anyone can buy stars for any repo, so this describes the star history only.

Sources: How star history is analyzed

Risk

Complete

Flags

No risk flags.

License

Now: No license found
A year ago: Not known

Packages

No published packages found.

Sources: GitHub: harvard-edge/cs249r_book

Badge

Add this to a README to show the current verdict:

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Earlier verdicts

Oct 14, 2026: Caution
Oct 14, 2026: Caution

Computed 10 hours ago · method 2026.10.2