Stanford CS229 Machine Learning vs MIT 6.S191 Introduction to Deep Learning

Reviewers consistently praise the mathematical depth — full derivations of GLMs, SVMs, EM, factor analysis and learning theory. The honest caveat is that the curriculum predates the Transformer era and deep learning gets brief treatment.

Andrew Ng's blackboard teaching gets repeated praise — one HN reviewer specifically prefers it to the Coursera version because he uses the board. The lecture pacing is academic and unhurried, which some find rigorous and others find slow.

Completely free — full 2018 lecture series on YouTube, all lecture notes, problem sets and section materials at cs229.stanford.edu. No certificate, no grading, no paywall. Reviewers consistently call it the highest-value rigorous ML resource available.

Zero official support for the YouTube cohort — no forum, no grading, no TA office hours, no cs50.ai-style tutor. Self-learners rely on community GitHub repos for solutions. Honest weakness, not unique to CS229.

Theory transfers durably — gradient descent, GLMs, regularisation, EM and learning theory remain foundational. The honest gap is that CS229 was not designed as a practical-first course; deployment, modern frameworks and Transformers are out of scope.

Reviewers consistently praise that the curriculum is refreshed annually and reaches modern topics — Transformers, generative modeling, LLMs, AI for science — that older courses do not cover. The honest catch is that depth is sacrificed for breadth in eight lectures.

Alexander Amini is described as clear, energetic and good at building intuition from first principles. The recurring caveat is the rotating-lecturer format — multiple reviewers wish Amini taught every lecture rather than alternating with guests and co-instructors.

Completely free — lectures on YouTube, slides on introtodeeplearning.com, labs on GitHub, runnable in free Google Colab. No paywall on any core material. The optional MIT Professional Certificate is not the path most reviewers take.

There is no official forum for online learners. Reviewers credit the GitHub issue tracker as the de facto Q&A channel, but multiple 2024-2025 issues report unresolved bugs in the PyTorch Sequential labs and outdated Colab dependencies.

Three Colab labs (music generation, vision, LLMs) are short but hands-on in both TensorFlow and PyTorch. Reviewers note this is a foundation, not a job-ready portfolio — you finish with intuition and small projects, not a deployed model.