J•JEV Field Guide
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EXTERNAL LEARNING MAP / 04

Jev learning resources: four sites mapped

Use Playground for live output, Manual for short projects, Learn Jev for patterns, and Datawhale Jev Cookbook for deeper Python and evaluation work.

An independently written guide with links. The Datawhale notebook course and community Chinese docs translation are separate entry points. Offline fixtures are not model measurements. Datawhale source checked 2026-10-02.

YOUR NEXT STEP / 06

Jev learning paths: beginner, Python experiments, and agents

Choose an entry by what you can already do. Finish one small artifact before adding another capability. You do not need to complete every community project.

Next step
014 presets · 6 scenario links

Jev Playground

The site says it offers real Jev runs without visitor signup, four ready-made question examples, and six linked scenario demos. Its free usage is limited. Its Boolean UI maps to an integration surface; TypeSafe's direct API calls this primitive Noul.

Best for

Best for observing how real output changes with input.

Keep in mind

This site does not mirror its model service; check the source for limits and results.

Open source site ↗
025 stages · 8 projects

Jev Manual

Its five-stage route covers concepts, a first call, confidence controls, shipping, and real projects. The project catalog lists eight Python tutorials with downloadable programs, no-network fixtures, and a key-based live mode.

Best for

Useful when you know some Python and want a complete runnable workflow.

Keep in mind

Fixtures explain the contract rather than report measured Jev output; live mode needs your own key.

Open source site ↗
0313 tutorials

Learn Jev

Thirteen tutorials are grouped into three foundations, seven patterns, and three reliability topics, spanning first calls, state, fan-out, gating, cascades, failure modes, benchmarks, and production.

Best for

Useful after the basics for workflow design and reliability.

Keep in mind

Some interpretations and performance figures are author analysis or vendor data; inspect the cited source.

Open source site ↗
0411 chapters · 18 recipes

Datawhale Jev Cookbook

The repository offers 11 Chinese chapters with runnable notebooks, 18 task recipes, projects, and evaluation methods. The reading site is primarily a community Chinese translation of TypeSafe docs, separate from the notebook course.

Best for

Best after the basics for running complete Python examples and studying evaluation.

Keep in mind

Offline examples are not Jev measurements. Original content uses CC BY-NC-SA 4.0; third-party material keeps its own licenses.

Open source site ↗

START HERE

Suggested beginner order

  1. Complete this site's eight-step course and four no-key decisions.
  2. Run a Playground example, changing one fact at a time.
  3. Choose a Manual project or a Learn Jev pattern.
  4. If you know Python, run Datawhale notebooks and separate offline fixtures from real API calls.

After the basics · Worked guides

From concepts to working designs

After the eight beginner lessons, choose a task. Each guide connects question design, input data, application logic, and evaluation in one workflow.

Explore all 14 guides and five paths

Where to learn the 18 recipe topics

This map connects original guides here with official recipes and community translations. It tracks topic coverage, not notebook reproduction or execution. Check source recipes for their methods and results.

TopicOriginal guide hereContinue experimenting
01 · Noul self-consistencyJev self-consistency and confidence: stable is not necessarily correctOfficial · Chinese
02 · Choice self-consistencyJev self-consistency and confidence: stable is not necessarily correctOfficial · Chinese
03 · Parallel questionsJev parallel questions: one state, several judgments, explicit routingOfficial · Chinese
04 · Re-rankingJev reranking and line search: candidates before answer locationsOfficial · Chinese
05 · Line searchJev reranking and line search: candidates before answer locationsOfficial · Chinese
06 · Structure recoveryJev structure recovery: preserve text, rebuild MarkdownOfficial · Chinese
07 · Function callingJev agent tool calls: selection, arguments, permissions, and fallbackOfficial · Chinese
08 · Skill suggestionJev agent skill routing: retrieve, verify, or load nothingOfficial · Chinese
09 · Entity alignmentJev entity alignment: aliases, names, and conflicting specificationsOfficial · Chinese
10 · RAG passage classificationJev for RAG: relevance, evidence support, and citation checksOfficial · Chinese
11 · Citation verificationJev for RAG: relevance, evidence support, and citation checksOfficial · Chinese
12 · LLM guardrailsJev input/output guardrails: risk signals into explicit policyOfficial · Chinese
13 · Extraction cascadeJev structured extraction cascades: extract, verify, escalateOfficial · Chinese
14 · Date extractionJev date and candidate extraction: roles before normalizationOfficial · Chinese
15 · Pre-parsed valuesJev date and candidate extraction: roles before normalizationOfficial · Chinese
16 · Hierarchical classificationJev hierarchical classification: paths, alternatives, and parent fallbackOfficial · Chinese
17 · Feature discoveryJev text feature discovery: semantic questions into testable experimentsOfficial · Chinese
18 · Confidence classificationJev self-consistency and confidence: stable is not necessarily correctOfficial · Chinese

Topic directory

Live practice and scenarios

11
  1. 01Run and vary an exampleOpen source site ↗Matching lesson here
  2. 02Support routing presetOpen source site ↗Matching lesson here
  3. 03Refund verification presetOpen source site ↗Matching lesson here
  4. 04Incident urgency presetOpen source site ↗Matching lesson here
  5. 05Agent next-action presetOpen source site ↗Matching lesson here
  6. 06Browser decision demoOpen source site ↗Matching lesson here
  7. 07Citation verificationOpen source site ↗Matching lesson here
  8. 08Email triageOpen source site ↗Matching lesson here
  9. 09Model routingOpen source site ↗Matching lesson here
  10. 10Smart home simulationOpen source site ↗Matching lesson here
  11. 11Semantic ad hidingOpen source site ↗Matching lesson here

Runnable projects

08
  1. 01Support ticket routerOpen source site ↗Matching lesson here
  2. 02AI model routerOpen source site ↗Matching lesson here
  3. 03RAG passage filteringOpen source site ↗Matching lesson here
  4. 04AI citation checkingOpen source site ↗Matching lesson here
  5. 05Structured data extractionOpen source site ↗Matching lesson here
  6. 06Agent tool risk gateOpen source site ↗Matching lesson here
  7. 07LLM guardrailsOpen source site ↗Matching lesson here
  8. 08Date expression extractionOpen source site ↗Matching lesson here

Systematic tutorials

13
  1. 01First API callOpen source site ↗Matching lesson here
  2. 02Three primitivesOpen source site ↗Matching lesson here
  3. 03Writing stateOpen source site ↗Matching lesson here
  4. 04Speculative fan-outOpen source site ↗Matching lesson here
  5. 05Confidence gatingOpen source site ↗Matching lesson here
  6. 06Composite scoringOpen source site ↗Matching lesson here
  7. 07Features, not answersOpen source site ↗Matching lesson here
  8. 08Cascade routingOpen source site ↗Matching lesson here
  9. 09Agent harnessOpen source site ↗Matching lesson here
  10. 10Real-time loopsOpen source site ↗Matching lesson here
  11. 11Failure modesOpen source site ↗Matching lesson here
  12. 12Cost and benchmarksOpen source site ↗Matching lesson here
  13. 13Production checklistOpen source site ↗Matching lesson here

Advanced course and evaluation

05
  1. 01Eleven-chapter course and setupOpen source site ↗Matching lesson here
  2. 02Eighteen recipes grouped by taskOpen source site ↗Matching lesson here
  3. 03Reproducible evaluation and metricsOpen source site ↗Matching lesson here
  4. 04Twelve apps and decision loopsOpen source site ↗Matching lesson here
  5. 05Community Chinese docs translationOpen source site ↗Matching lesson here
Sources
Return to the course