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15 categories · real Python execution · local-first

Learn by building.
Trust what you can test.

DeepForge is a local-first ML practice platform and an experiment in reliable, evidence-based programming education. Solve 5,730+ problems with real in-browser Python execution — no sklearn, no torch, no shortcuts.

Start practicingBrowse pathsNo account. Progress saves locally.

Practice is the product. Evidence is the research agenda.

Reliable and evidence-based programming education in the age of generative AI.

The work is grounded in three practical questions — not claims of a finished theory.

Read the publications

Test adequacy

Can a test suite distinguish correct programs from plausible-but-wrong ones?

Silent Bug Hunt pairs a reference function with a test-passing one-line divergence, then asks you to find the input the suite missed.

Try Silent Bug Hunt

Behavioral evidence

Can an edit reveal a meaningful behavioral change without becoming a grade?

Behavioral Delta Ledger reports only whether hidden checks changed after an edit. It never affects progress, review, or certificates.

Explore the ledger

Auditable feedback

Can learning guidance show the evidence behind it and respond when that evidence is refuted?

Warrant Lab makes each derived claim inspectable: see its checks, challenge it, and audit the resulting bookkeeping.

Open Warrant Lab
5,730+
problems
15
categories
33
learning paths
0
dependencies
∞
executions

Categories

Fifteen foundations. Pick one and start at the top.

Explore

Everything in DeepForge, in one place. Pick a card to open it.

Learn

Problems5,730+Browse the full bank by category and difficulty, then solve in the browser.
Learning PathsOrdered sequences that take you from zero to a working ML primitive.
ProjectsMulti-step labs that build a working system one problem at a time.
Interview PrepCompany-style tracks and timed mocks from warm-up to hard.
Pen & PaperNo-code math problems answered by hand, with worked explanations.
ConceptsEvery math checkpoint with worked steps and a spaced review schedule you can grade anytime.
ArticlesInteractive lessons with live demos that run in the page.
PapersUnderstand every DeepSeek paper from first principles, in order.
PublicationsOne research agenda, six papers, and the evidence behind every claim. Nothing here is peer reviewed.
KeyFuseA read-only cache-key auditor: probe a task's declared inputs, print a minimal same-key / different-output witness, and repair the key conservatively.
Warrant LabA read-only contestability lab: derived claims carry an append-only falsification ledger, a recomputable warrant grade, and exact demotion through cites — never a truth verdict.
REPROGPUA read-only conformance lab: run a declared integer WebGPU kernel subset in your browser and compare its output hashes across adapters, with a float kernel as the explicit negative control.

Practice

TodayYour pre-built session: the daily problem, due reviews, and one weak-area pick.
ReviewThe whole spaced queue: what's due, what's overdue, and a drill that catches you up.
Daily ChallengeOne problem picked for everyone each day. Solve it to keep your streak alive.
Silent Bug HuntHunt a silent bug: patch a function and find the input where a hidden ghost that passes every shipped test diverges from the reference.
Behavior LedgerSee which hidden checks an edit changed — counts only, opt-in and device-local, never grading.
LabsDataset-driven challenges scored against a held-out benchmark.
ResearchBeat a baseline model and your code becomes the latest best.
SimsLive simulations you can play, pause, and step through.
PlaygroundA scratch pad that runs Python locally via Pyodide.

Compete

ContestsTimed problem sets with a countdown and a saved best score.
SpeedrunA seeded solve-a-thon against the clock and your own ghost.
LeaderboardFlame Score, streaks, and your rank among local solvers.

You

BadgesLevel, quests, and the badges you unlock from progress.
StatsSolved counts, accuracy, streaks, and an estimated mastery score.
CertificatesClaim printable certificates for paths, collections, and categories.
BackupExport a backup of your data or move it to another device.
CollectionsCurated sets and your own problem collections.
PlaylistsBuild, reorder, and share ordered sets of problems.

Community

DiscussAsk questions and read threads from other solvers.
Submit a ProblemAuthor a problem, validate it locally, and export the snippet.
AboutWhat DeepForge is, who built it, and why.
Engineering — how we build DeepForgeRead the blog →