MIT 6.S191 Introduction to Deep Learning vs Machine Learning Specialization

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as the de facto Q&A channel, but multiple 2024-2025 issues report unresolved bugs in the PyTorch Sequential labs and outdated Colab dependencies.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.

Praised for intuitive explanations and the expanded neural networks unit, but reviewers note the new version trades depth for accessibility — backprop is brushed past, RL feels like a preview.

Andrew Ng's pedagogy gets near-universal praise across HN and blogs. Multiple commenters describe him as the best instructor they ever had; complaints are essentially absent.

Content is strong relative to cost, and auditing remains possible. The friction comes from Coursera's subscription gating around grading and certificates — a recurring HN gripe.

Browser-hosted Jupyter notebooks with auto-grading remove a major friction point from the original. The community forum is active but not deeply mentioned in reviews.

Builds a real foundation in ideas and Python tooling, but datasets are clean and deployment is out of scope. Reviewers flag the need to supplement with Kaggle or a portfolio project.