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cs249r_book vs llama_index

cs249r_book and llama_index share 41 technologies: async-lru, pyzmq, pyarrow, anyio, tornado, soupsieve, tinycss2, ipywidgets, matplotlib-inline, prompt-toolkit, Rich, matplotlib, argon2-cffi, Ollama, OpenAI, torch, transformers, scikit-learn, sentence-transformers, nltk, bleach, defusedxml, jinja2, markupsafe, mistune, nbconvert, xlrd, beautifulsoup4, pillow, lxml, nbformat, annotated-types, jsonschema-specifications, referencing, rfc3339-validator, Pydantic, jsonschema, pydantic-core, prometheus-client, python-json-logger, and psutil. Both are written in Python.

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What they share and what sets them apart

harvard-edge

cs249r_book

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

Python30kRead on November 8, 2026, at commit de87c01What is cs249r_book built with?

Only in cs249r_book

In common

run-llama

llama_index

LlamaIndex is the document processing platform for AI

Python52.8kRead on November 5, 2026, at commit 444fdf0What is llama_index built with?

Only in llama_index

Side by side

SizeLines written by people and agents, without generated ones; code files, without tests.
cs249r_book821,581 lines written1,977 code files
llama_index473,236 lines written2,055 code files
Who writes itA commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
cs249r_book2.7% of its commits signed by AIWith Codex, Claude Code, Gemini CLI, and Cursor
llama_index0.2% of its commits signed by AIWith Claude Code, Cursor, and GitHub Copilot
ActivityFrom GitHub and its history, on the day SeeRepo read it.
cs249r_bookLast push November 8, 202622,351 commits30,011 stars
llama_indexLast push November 5, 20267,963 commits52,820 stars
TestsThe files that test the code, and the share of code files a test imports.
cs249r_book629 test files16.6% of its code files have a test that imports them
llama_index1,607 test files46.5% of its code files have a test that imports them

Frequently asked questions

Which is bigger, cs249r_book or llama_index?
cs249r_book, with 821,581 lines written; llama_index has 473,236.

The proof: harvard-edge/cs249r_book's code at commit de87c01

Which has more GitHub stars, cs249r_book or llama_index?
llama_index, with 52,820 stars; cs249r_book has 30,011.

The proof: run-llama/llama_index on GitHub

Which has more tests, cs249r_book or llama_index?
llama_index, with 1,607 test files; cs249r_book has 629.

The proof: run-llama/llama_index's code at commit 444fdf0

Which was updated more recently, cs249r_book or llama_index?
cs249r_book: its last push was on November 8, 2026, and llama_index's on November 5, 2026.

The proof: harvard-edge/cs249r_book's commits on GitHub

Which has more commits signed by AI, cs249r_book or llama_index?
cs249r_book: an AI signed 2.7% of its commits, with Codex, Claude Code, Gemini CLI, and Cursor; in llama_index, 0.2%.

The proof: the commits each tool signed in harvard-edge/cs249r_book

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