CS229 is the Stanford course that works through the mathematical derivations of machine learning. The Spring 2026 recordings make 17 lectures public: the first ten cover linear models, neural networks, and unsupervised learning, and the last seven go on to diffusion models, LLMs, and training reasoning models with reinforcement learning. This series has one post per lecture, and this post is the map: what each lecture actually teaches, where the video titles don't match, and where to pick up what the lecture notes cover but the lectures skipped.
Tavily exposes Search, Extract, Map, and Crawl through one web API for agents. The free plan includes 1,000 credits per month; basic, fast, and ultra-fast Search cost 1 credit each, while advanced costs 2.
AIF-C01, MLA-C02, and AIP-C01 are not a difficulty ladder but three job-function slices: AIF tests AI business judgment, MLA tests whether you can put traditional ML, foundation models, and agentic workflows into production, and AIP tests whether you can integrate foundation models into a GenAI system. The MLA-C02 English beta is open for registration; general-availability dates and non-English versions remain unannounced.
Before comparing exam objectives there is one fact that outranks all of them: registration for the Claude certifications is open only to organizations in the Claude Partner Network — individuals cannot sign up. For those who clear that gate, four things actually decide the answer. CCAO-F ($99) does not count toward partner tier eligibility while the other three do. Claude Code is 20% of CCAR-F but only 3.1% of CCDV-F — the architect exam tests the tool far more heavily than the developer exam. CCAR-P is 28% non-technical (governance 14% plus stakeholder communication 14%), which nothing else in this series is. And CCAO-F is the cheapest but only 14% Prompting; Output Evaluation at 21% is its real spine. All four are valid 12 months, with retakes at 14 / 30 / 90 days and 4 attempts per rolling 12 months.
Across Microsoft's four AI/agent certifications there are two hard prerequisites: AI-500 requires AI-103, and AB-100 requires any one associate on its list. The rest is positioning. Three forks decide it: whether you write Python (AI-103/AI-500 vs AB-620), whether you build or judge (AB-100 vs the rest), and whether you can actually start today — AI-500's four official learning paths currently 404, AB-620 has no practice test, AB-100 has a free one. For readers who prefer Chinese there is a fourth fork: AI-103, AB-620, and AB-100 offer Traditional Chinese, and only AI-500 is English only. All four cost $165 in the US ($83 in Taiwan), expire after one year, and renew free but only inside a six-month window.
NVIDIA's generative AI line has four exams: NCA-GENL and NCA-GENM ($125 each, associate), NCP-GENL and NCP-AAI ($200 each, professional). Three decision inputs no other vendor forces on you. One: both professional exams still show 'Coming soon' next to Register, so any near-term plan is down to the two associates. Two: the cost of the official recommended training differs sharply by level. In autumn 2026 the two associate exams switched to one free open-source set of materials plus one course, while the two professional exams still list five paid courses, $1,620 at list price for NCP-GENL. Three: the official web pages and PDFs differ in a few places — two NCP-AAI weights do not match, and two cells of NCP-GENL's web table carry misplaced text — so for those two exams follow the PDF or budget a range. Lock-in also varies sharply: NCP-AAI is 7% NVIDIA-specific, NCP-GENL is 31% GPU and model-compression work.
The AIF-C01 exam guide moved to v1.1 on April 30, 2026, adding seven objectives — MCP, multi-agent patterns, context engineering, token-based pricing, and hallucination detection all became testable, with Bedrock AgentCore, Kiro, and Strands Agents joining in-scope services. Almost every summary online describes the older version. This guide builds on the official five-domain weighting, integrating AWS's four-step prep method and field-tested advice from 10+ candidates who passed. $100, 90 minutes, 65 questions (50 scored), pass at 700, valid 3 years — and it is offered in Traditional Chinese.
AIP-C01 tests integrating foundation models into production AWS applications: RAG, agents, security, cost, and evaluation. This guide follows the five official domains with a prerequisite self-check, four-step preparation plan, resource choices, and hands-on checkpoints, plus a ten-week schedule, an AI study prompt, and exam-day guidance. Start with a diagnostic, then close gaps through one RAG-and-agent project.
A complete study guide for Claude's official architect certification (CCAR-F): five domains weighted 27/18/20/20/15, four scenarios drawn from six, common anti-patterns, and hands-on preparation. Official specs are 60 items / 120 minutes / $125 / 12-month validity / 720 to pass; registration is limited to Claude Partner Network members, and on-time renewal is free and non-proctored.
CCAR-P is the most expensive and most senior of Anthropic's four exams ($175, 63 items, 120 minutes). Integration is the heaviest domain at 19%, but what really separates it from everything else in this series is the other two: Governance, Safety & Risk Management at 14% and Stakeholder Communication & Lifecycle Management at 14% — 28% combined on compliance, risk, discovery interviews, and delivery lifecycle rather than code. The guide names GDPR, HIPAA, and FedRAMP, and its Intended Audience explicitly excludes entry-level developers and anyone doing 'prompt writing without broader system design responsibility.'
CCAO-F is the cheapest of Anthropic's four exams ($99, 60 items, 120 minutes), aimed at people who work with Claude rather than build against it. The heaviest of its seven domains is Output Evaluation and Validation at 21% — spotting hallucinations, deciding when human review is required, and adapting outputs — with Governance, Risk, and Responsible Use at another 15%. Anthropic states plainly that it is not for developers building against APIs or designing agentic systems. One easily missed limitation: this credential does not count toward Claude Partner Network tier eligibility, while the other three do.
CCDV-F is the engineer's exam among Anthropic's four certifications. The official blueprint has eight domains, and the heaviest — Applications and Integration at 33.1% — is led by Claude Application Design (8.6%) and Software Engineering Foundations (7.4%), meaning a third of the exam is API mechanics and ordinary software engineering. The counterintuitive part: Claude Code is only 3.1% and Eval only 2.6%, while the sibling Architect exam gives Claude Code 20%. Official specs: $125, 53 items, 120 minutes, pass at 720, valid 12 months, registration limited to Claude Partner Network organizations.
Google's Professional ML Engineer exam guide was rewritten in 2026: Vertex AI is renamed Gemini Enterprise Agent Platform throughout, so older study material no longer matches the product names in the questions. This guide uses the official six-section weighting as its skeleton, listing what each section tests, which official materials cover it, and what to build — plus a study schedule whose reasoning is spelled out. Official specs: $200, two hours, 50–60 multiple-choice and multiple-select questions, two-year validity, 3+ years of industry experience recommended including 1+ year on Google Cloud.
`batch_runner.py` runs thousands of prompts in parallel into ShareGPT-format tool-calling trajectories, lets each prompt name its own container image, and resumes by matching prompt content rather than index. Two quality filters run before you see the data: samples with zero reasoning are discarded, and entries calling hallucinated tool names are dropped at merge time. This is why a research lab builds a personal agent — the agent is the data pipeline.
One gateway process fronts 30-plus chat platforms and denies every user not on an allowlist or paired by DM. The scheduler adds two unusual guards: pre-dispatch validation marks a misconfigured job `blocked_config` without making a single LLM call, and the model drift guard makes unpinned jobs fail closed when the global model changes — protecting you from an hourly job quietly following you onto a paid model.
Hermes install paths come in three support tiers: macOS (Apple Silicon), Windows 10/11, Linux/WSL2, and Docker are Tier 1; Termux and Nix are Tier 2; pip, brew, AUR, and Intel Macs are explicitly unsupported — fixes for those won't be merged. On the upgrade side, `hermes update` snapshots state first, then compiles nine critical files after the pull and hard-resets the checkout if any fail to parse.
Hermes Agent is Nous Research's MIT-licensed agent framework, built around a learning loop: it writes its own skills, curates its memory, and searches past sessions with FTS5. It ships `hermes claw migrate` to move you off OpenClaw — but OpenClaw was not replaced, and both projects are still moving. This is the series opener: what it is, how it differs, and when not to pick it.
Hermes memory has hard caps: 2,200 characters for MEMORY.md and 1,375 for USER.md, and an over-limit write returns an error instead of auto-compacting, forcing the agent to make room itself. Skills are maintained by a curator that runs every 7 days after 2 hours of idle, marks skills stale at 30 days and archives at 90 — but never deletes. The switches actually worth flipping are `memory.write_approval` and `skills.write_approval`, which stage the background self-improvement writes for review.
`hermes claw migrate` imports persona, memory, skills from four locations, model and provider config, platform tokens, and the approval allowlist — but secrets are never imported silently, and even `--preset full` requires an explicit `--migrate-secrets`. What can't move (cron jobs, plugins, hooks, the multi-agent list, deep channel config) isn't discarded but parked in `~/.hermes/migration/openclaw/<timestamp>/archive/` for manual work. Coming from Claude Code or Codex is a different command: `hermes import-agent`.
Hermes supports 40+ providers, and the consumer-subscription OAuth paths are where billing surprises live: Anthropic OAuth only spends Claude Max extra-usage credits, and Claude Pro can't use it at all. Auxiliary tasks default to `provider: auto`, meaning your expensive main model does compression and vision grunt work. The fallback chain is a one-shot switch per session, not continuous retry.