Modal Classes and Lifecycle

Use this skill when using class-based Functions for stateful workloads, lifecycle management, or parametrization.

When to Use This Skill

• Loading an ML model once per container (not per request)
• Sharing state between method calls
• Running setup/teardown logic per container
• Creating separate container pools per parameter set (e.g., per user)
• Combining GPU inference with lifecycle hooks

Core Pattern: Class with Lifecycle

import modal

app = modal.App()