Browser · Pyodide
Trace a Pattern into a Prediction
Meet AI: Patterns, Predictions, and Decisions
Workbench
Change one thing. Run it. Read what changed.
Every lab below is linked to the lesson that gives the experiment its question and context.
01ChangeEdit one meaningful input, value, or piece of code.
02RunExecute the smallest experiment that can answer the question.
03CompareRead the output against the previous state or prediction.
04ExplainSay what changed, what stayed fixed, and why the evidence matters.
Published lab inventory
221 lesson-linked labs are currently integrated across Levels 0–15. 119 run in the browser. 14 open as notebook workflows. 88 require a local environment.
Level 0
12 labsOpen in lesson →
Browser · Pyodide
Edit Examples and Labels
Rules, Examples, and Data
Browser · Pyodide
Compare a Rule with a Learned Threshold
Rules vs Learning
Browser · Pyodide
Choose Features and Find the Label
Features and Labels
Browser · Pyodide
Keep a Test Set Untouched
Training Data and Test Data
Browser · Pyodide
Run Two Controlled Threshold Experiments
Your First AI Experiment
Browser · Pyodide
Trace Inputs, Outputs, and Labels
Inputs, Outputs, and Predictions
Browser · Pyodide
Inspect Prediction Errors
Errors: When a Model Gets It Wrong
Browser · Pyodide
Change One Thing at a Time
Changing One Thing at a Time
Browser · Pyodide
Compare a Predictor with a Baseline
Fair Comparisons and Baselines
Browser · Pyodide
Turn Results into an Experiment Explanation
From Experiment to Explanation
Browser · Pyodide
Debug and Improve a Tiny Predictor
Debug and Improve a Tiny Predictor
Level 1
18 labsBrowser · Pyodide
Compare Prediction Rules by Loss
What Machine Learning Is Really Optimizing
Browser · Pyodide
Inspect a Dataset as Features and Target
Datasets as Tables
Browser · Pyodide
Create a Reproducible Train/Test Split
Splitting Data Without Cheating
Browser · Pyodide
Fit a Linear Regression Model
Linear Regression
Browser · Pyodide
Compare MAE and MSE
Loss Functions
Browser · Pyodide
Trace Gradient Descent Steps
Gradient Descent
Browser · Pyodide
Compare Learning Rates
Learning Rate
Browser · Pyodide
Scale Features Without Leakage
Feature Scaling
Browser · Pyodide
Fit Regression with Multiple Features
Multiple Features
Browser · Pyodide
Build and Inspect a Simple Classifier
Classification
Browser · Pyodide
Fit Logistic Regression and Inspect Probabilities
Logistic Regression
Browser · Pyodide
Probe a Logistic Decision Boundary
Decision Boundaries
Browser · Pyodide
Compute Precision, Recall, and F1
Metrics Beyond Accuracy
Browser · Pyodide
Measure Variation with Cross-Validation
Cross-Validation
Browser · Pyodide
Find and Remove Data Leakage
Data Leakage
Browser · Pyodide
Compare Underfitting and Overfitting
Bias, Variance, and Overfitting
Browser · Pyodide
Build a Reproducible ML Pipeline
Pipelines and Reproducible Experiments
Browser · Pyodide
Review a Trustworthy Classifier
Model Review: Build a Trustworthy Classifier
Level 2
15 labsBrowser · Pyodide
Compare a Linear Rule with a Tiny Network
Why Neural Networks
Browser · Pyodide
Trace a Neuron's Weighted Sum
Neurons as Weighted Sums
Browser · Pyodide
Compare Activation Functions
Activation Functions
Browser · Pyodide
Track Layer and Batch Shapes
Layers and Shapes
Browser · Pyodide
Run a Two-Layer Forward Pass
Forward Pass by Hand
Browser · Pyodide
Compare Neural-Network Losses
Loss for Neural Networks
Browser · Pyodide
Probe a Gradient Direction
Backpropagation Intuition
Browser · Pyodide
Estimate a Derivative Numerically
Derivatives Just in Time
Browser · Pyodide
Backpropagate One Scalar Parameter
Backpropagation in Code
Browser · Pyodide
Compare Full and Mini-Batch Gradients
Batching and Mini-Batches
Browser · Pyodide
Compare SGD and Adam
Optimizers: SGD to Adam
Browser · Pyodide
Inspect Initialization Symmetry
Initialization
Browser · Pyodide
Compare L2 Regularization
Regularization
Browser · Pyodide
Diagnose Training Curves
Training Curves and Debugging
Browser · Pyodide
Neural Network Debugging Workshop
Neural Network Debugging Workshop
Level 3
14 labsBrowser · Pyodide
Inspect a Learned Representation
Representations: What Networks Learn
Browser · Pyodide
Slide a Local Convolution Filter
Convolutions and Local Patterns
Browser · Pyodide
Build a Tiny Image Classifier
Build a Tiny Image Classifier
Browser · Pyodide
Compare Pooling and Downsampling
Pooling and Downsampling
Browser · Pyodide
Test Safe and Unsafe Augmentations
Data Augmentation
Browser · Pyodide
Preserve Order in Sequence Features
Sequence Data and Time
Browser · Pyodide
Trace Recurrent Memory
Recurrent Models and Memory
Browser · Pyodide
Measure Long-Context Influence
Why Long Context Is Hard
Browser · Pyodide
Compare Embedding Geometry
Embeddings as Learned Coordinates
Notebook · Google Colab
Transfer Learning on Handwritten Digits
Transfer Learning
Notebook · Google Colab
Inspect a Pretrained Model Contract
Pretrained Models
Notebook · Google Colab
Fine-Tune a Small Encoder
Fine-Tuning a Small Encoder
Notebook · Google Colab
Failure Analysis Across Modalities
Failure Analysis Across Modalities
Notebook · Google Colab
Adaptation Strategy Review
Adaptation Review: Choose, Fine-Tune, Explain
Level 4
14 labsBrowser · Pyodide
Trace Text into Tokens and IDs
Text Is Not Numbers Yet
Browser · Pyodide
Compare Character, Word, and Subword Pieces
Characters, Words, and Subwords
Browser · Pyodide
Measure Vocabulary Coverage and Unknown Tokens
Vocabulary and Unknown Tokens
Notebook · Google Colab
Run the Simple Tokenizer Notebook
Build a Simple Tokenizer
Browser · Pyodide
Inspect UTF-8 Byte Tokens
Byte-Level Tokenization
Browser · Pyodide
Learn One Subword Merge from Frequency
Subword Learning
Browser · Pyodide
Reserve and Verify Special Token IDs
Token IDs and Special Tokens
Browser · Pyodide
Pad, Truncate, and Build Masks
Padding, Truncation, and Masks
Browser · Pyodide
Look Up Token Embedding Vectors
Embeddings for Tokens
Browser · Pyodide
Attach Positions to Token IDs
Position Matters
Browser · Pyodide
Generate Sinusoidal Position Vectors
Positional Encodings
Browser · Pyodide
Compare Truncation and Sliding Context Windows
Context Windows
Browser · Pyodide
Measure Tokenizer Failure Modes
Tokenizer Failure Modes
Notebook · Google Colab
Run the Tokenizer Evaluation Workshop
Tokenizer Evaluation Workshop
Level 5
16 labsBrowser · Pyodide
Explore Focused Attention
Why Attention
Browser · Pyodide
Normalize an Attention Row
Words Looking at Words
Browser · Pyodide
Separate Query, Key, and Value Roles
Queries, Keys, and Values
Browser · Pyodide
Measure Dot-Product Similarity
Dot Products as Similarity
Browser · Pyodide
Scale Dot Products Before Softmax
Scaled Dot-Product Attention
Browser · Pyodide
Mix Weighted Values
Attention Weights and Weighted Values
Notebook · Google Colab
Run the Causal Self-Attention Notebook
Self-Attention
Browser · Pyodide
Prove Causal Masking
Causal Masking
Notebook · Google Colab
Run the Multi-Head Attention Lab
Multi-Head Attention
Browser · Pyodide
Test Residual Connections
Residual Connections
Browser · Pyodide
Normalize Token Features
Layer Normalization
Browser · Pyodide
Build a Position-Wise Feed-Forward Network
Feed-Forward Networks
Notebook · Google Colab
Run the Putting the Pieces Together Lab
Putting the Pieces Together
Notebook · Google Colab
Run the Transformer Block Lab
Transformer Block
Notebook · Google Colab
Run the Stacking Transformer Blocks Lab
Stacking Transformer Blocks
Notebook · Google Colab
Run the Build a Mini Transformer Lab
Build a Mini Transformer
Level 6
14 labsBrowser · Pyodide
Inspect Causal Decoder Access
Decoder-Only Language Models
Browser · Pyodide
Build Next-Token Targets
Next-Token Prediction
Browser · Pyodide
Create Training Windows from Text
Training Examples from Text
Browser · Pyodide
Validate Tiny LM Configuration Shapes
Model Configuration and Shapes
Browser · Pyodide
Trace Tiny LM Assembly Shapes
Assemble the Model
Notebook · Google Colab
Train and Sample the Tiny Language Model
Training Loop
Browser · Pyodide
Record Reproducible Checkpoint Metadata
Checkpoints and Reproducibility
Browser · Pyodide
Compare Training and Validation Loss
Validation Loss and Overfitting
Browser · Pyodide
Sample from a Fixed Token Distribution
Sampling Text
Browser · Pyodide
Compare Temperature, Top-k, and Top-p
Temperature, Top-k, and Top-p
Browser · Pyodide
Measure Generation Failure Signals
Generation Failure Modes
Browser · Pyodide
Evaluate a Tiny Language Model
Evaluate a Tiny Language Model
Local · local-python
Package a Reproducible Tiny LLM Run
Package the Training Run
Local · local-python
Run the Tiny LLM Integration Workshop
Tiny LLM Integration Workshop
Level 7
13 labsBrowser · Pyodide
Separate Probabilities from Sampling
How Modern LLMs Behave
Browser · Pyodide
Build a Prompt Contract
Prompting as Interface Design
Browser · Pyodide
Keep Roles and Trust Separate
System, User, and Assistant Roles
Browser · Pyodide
Test Few-Shot Boundary Examples
Few-Shot Examples
Browser · Pyodide
Separate Extraction from Calculation
Reasoning Tasks Without Magic Words
Browser · Pyodide
Validate Structured Output
Structured Outputs
Browser · Pyodide
Move Evidence Through Context
Context Windows and Lost Information
Browser · Pyodide
Retrieve a Smaller Evidence Set
Long-Context Strategies
Browser · Pyodide
Control Decoding Randomness
Decoding and Determinism
Browser · Pyodide
Abstain When Evidence Is Missing
Hallucinations and Uncertainty
Browser · Pyodide
Preserve Trust Provenance
Prompt Injection Basics
Browser · Pyodide
Evaluate Prompt Cases
Prompt Evaluation
Local · local-python
Review a Reliable LLM Workflow
Reliable LLM Workflow Review
Level 8
14 labsBrowser · Pyodide
Choose an Adaptation Lever
When to Fine-Tune
Browser · Pyodide
Audit Instruction-Tuning Data
Data for Instruction Tuning
Browser · Pyodide
Split Related Training Records Safely
Cleaning and Formatting Training Data
Browser · Pyodide
Compute Response-Only SFT Loss
Supervised Fine-Tuning
Browser · Pyodide
Count PEFT Trainable Parameters
Parameter-Efficient Fine-Tuning
Browser · Pyodide
Trace LoRA Shapes and Counts
LoRA Intuition
Browser · Pyodide
Build a Tiny LoRA Adapter
Build a LoRA Adapter
Browser · Pyodide
Measure Quantization Error
Quantization for Fine-Tuning
Browser · Pyodide
Audit Preference Pairs
Preference Data
Browser · Pyodide
Compute Preference Margins
Preference Optimization Concepts
Browser · Pyodide
Compare Base and Adapted Evaluations
Evaluate Before and After Fine-Tuning
Browser · Pyodide
Detect Retention Regressions
Catastrophic Forgetting and Drift
Local · local-python
Validate a Model Card and Training Record
Model Cards and Training Records
Local · local-python
Run the Fine-Tuning Integration Workshop
Fine-Tuning Integration Workshop
Level 9
14 labsBrowser · Pyodide
Separate Retrieval and Generation Failures
Why Retrieval-Augmented Generation
Browser · Pyodide
Build Chunks with Metadata
Documents, Chunks, and Metadata
Browser · Pyodide
Compare Retrieval Embeddings
Embeddings for Retrieval
Browser · Pyodide
Compute Vector Similarity
Vector Similarity
Browser · Pyodide
Build a Tiny Vector Index
Build a Vector Index
Browser · Pyodide
Combine Keyword and Vector Search
Keyword and Hybrid Search
Browser · Pyodide
Rerank a Candidate Set
Reranking
Browser · Pyodide
Rewrite Queries Without Losing Intent
Query Rewriting
Local · local-python
Build a Grounded Prompt Package
Grounded Prompt Construction
Local · local-python
Validate Citations and Source Support
Citations and Source Attribution
Local · local-python
Evaluate Retrieval and Grounded Answers
RAG Evaluation
Local · local-python
Trace Retrieval Failure Boundaries
Failure Modes in Retrieval
Local · local-python
Validate Freshness and Access Eligibility
Freshness, Access Control, and Updates
Local · local-python
Integrate an Evidence-Backed RAG System
RAG System Integration Workshop
Level 10
13 labsLocal · local-python
LLMs That Use Tools
LLMs That Use Tools
Local · local-python
Function Calling and Tool Schemas
Function Calling and Tool Schemas
Local · local-python
Validate Structured Tool Arguments
Validate Structured Tool Arguments
Local · local-python
Tool Results Back into Context
Tool Results Back into Context
Local · local-python
Error Handling and Retries
Error Handling and Retries
Local · local-python
State Machines for Tool Workflows
State Machines for Tool Workflows
Local · local-python
Web and API Tool Patterns
Web and API Tool Patterns
Local · local-python
Code Execution as a Tool
Code Execution as a Tool
Local · local-python
Vision-Language Inputs
Vision-Language Inputs
Local · local-python
Audio and Speech Inputs
Audio and Speech Inputs
Local · local-python
Multimodal Evaluation
Multimodal Evaluation
Local · local-python
Tool Security Boundaries
Tool Security Boundaries
Local · local-python
Tool-Using Assistant Integration Workshop
Tool-Using Assistant Integration Workshop
Level 11
13 labsLocal · local-python
What Makes an Agent
What Makes an Agent
Local · local-python
Observe, Decide, Act
Observe, Decide, Act
Local · local-python
Agent Loops
Agent Loops
Local · local-python
Plans and Subgoals
Plans and Subgoals
Local · local-python
State and Working Memory
State and Working Memory
Local · local-python
Long-Term Memory Patterns
Long-Term Memory Patterns
Local · local-python
Tool Selection
Tool Selection
Local · local-python
Reflection and Critique
Reflection and Critique
Local · local-python
Stopping Conditions
Stopping Conditions
Local · local-python
Human Approval Points
Human Approval Points
Local · local-python
Agent Failure Modes
Agent Failure Modes
Local · local-python
Agent Evaluation Basics
Agent Evaluation Basics
Local · local-python
Bounded Agent Integration Workshop
Bounded Agent Integration Workshop
Level 12
13 labsLocal · local-python
Agent Harnesses and Runtime Structure
Agent Harnesses and Runtime Structure
Local · local-python
Task Queues and Durable State
Task Queues and Durable State
Local · local-python
Retries, Idempotency, and Recovery
Retries, Idempotency, and Recovery
Local · local-python
Tracing Agent Decisions
Tracing Agent Decisions
Local · local-python
Sandboxing and Permissions
Sandboxing and Permissions
Local · local-python
Memory Retrieval and Compression
Memory Retrieval and Compression
Local · local-python
Parallel Tool Calls
Parallel Tool Calls
Local · local-python
Delegation and Subagents
Delegation and Subagents
Local · docker
Agent Test Fixtures
Agent Test Fixtures
Local · docker
Simulation-Based Evaluation
Simulation-Based Evaluation
Local · docker
Cost, Latency, and Reliability
Cost, Latency, and Reliability
Local · docker
Operating an Agent in Production
Operating an Agent in Production
Local · docker
Agent Harness Integration Workshop
Agent Harness Integration Workshop
Level 13
12 labsLocal · local-python
Why Interoperability Matters
Why Interoperability Matters
Local · local-python
Tool and Resource Protocols
Tool and Resource Protocols
Local · local-python
MCP Concepts: Servers, Clients, and Capabilities
MCP Concepts: Servers, Clients, and Capabilities
Local · local-python
MCP Server Boundary Preflight
MCP Server Design
Local · local-python
Connect an MCP Client
Connect an MCP Client
Local · local-python
Security and Trust in MCP
Security and Trust in MCP
Local · local-python
Agent-to-Agent Communication Concepts
Agent-to-Agent Communication Concepts
Local · local-python
A2A Messages, Tasks, and Artifacts
A2A Messages, Tasks, and Artifacts
Local · docker
Multi-Agent Coordination Patterns
Multi-Agent Coordination Patterns
Local · docker
Shared State and Conflict Resolution
Shared State and Conflict Resolution
Local · docker
Multi-Agent Evaluation
Multi-Agent Evaluation
Local · docker
Interoperable Agent System Workshop
Interoperable Agent System Workshop
Level 14
13 labsLocal · local-python
From Notebook to Service
From Notebook to Service
Local · local-python
Inference APIs
Inference APIs
Local · local-python
Batching and Streaming
Batching and Streaming
Local · local-python
Model Loading and Memory
Model Loading and Memory
Local · local-python
Quantization for Serving
Quantization for Serving
Local · local-python
KV Cache and Generation Throughput
KV Cache and Generation Throughput
Local · docker
Latency, Throughput, and Cost
Latency, Throughput, and Cost
Local · docker
GPU Scheduling Basics
GPU Scheduling Basics
Local · docker
Containers and Reproducible Deployments
Containers and Reproducible Deployments
Local · docker
Observability for AI Systems
Observability for AI Systems
Local · docker
Rollouts, Canaries, and Rollbacks
Rollouts, Canaries, and Rollbacks
Local · docker
Capacity Planning and Failure Recovery
Capacity Planning and Failure Recovery
Local · docker
Production AI Operations Workshop
Production AI Operations Workshop
Level 15
13 labsLocal · local-python
Evaluation as a System
Evaluation as a System
Local · local-python
Golden Sets and Regression Suites
Golden Sets and Regression Suites
Local · local-python
Human Evaluation
Human Evaluation
Local · local-python
Model and System Safety Basics
Model and System Safety Basics
Local · local-python
Threat Modeling for AI Systems
Threat Modeling for AI Systems
Local · local-python
Prompt Injection and Data Exfiltration
Prompt Injection and Data Exfiltration
Local · local-python
Tool and Agent Security
Tool and Agent Security
Local · local-python
Privacy, Data Governance, and Retention
Privacy, Data Governance, and Retention
Local · docker
Red Teaming and Abuse Testing
Red Teaming and Abuse Testing
Local · docker
Frontier Model Capabilities and Limits
Frontier Model Capabilities and Limits
Local · docker
Emerging Agent Protocols and Ecosystems
Emerging Agent Protocols and Ecosystems
Local · docker
Research Reading and Reproduction
Research Reading and Reproduction
Local · docker
Capstone Integration: Ship, Evaluate, and Defend
Capstone Integration: Ship, Evaluate, and Defend