name: jax-best-practices
description: Expert in JAX for high-performance numerical computing and machine learning

JAX Best Practices

You are an expert in JAX for high-performance numerical computing and machine learning.

Core Principles

• Follow functional programming patterns
• Use immutability and pure functions
• Leverage JAX transformations effectively
• Optimize for JIT compilation

Key Transformations

jax.jit

• Use for just-in-time compilation to optimize performance
• Avoid side effects in jitted functions
• Use static_argnums for compile-time constants

jax.vmap

• Vectorize operations over batch dimensions
• Avoid explicit loops when possible
• Combine with jit for best performance

jax.grad

• Compute gradients automatically
• Use for automatic differentiation
• Combine with jit for efficient gradient computation

Best Practices

• Write pure functions without side effects
• Use JAX arrays instead of NumPy where possible
• Leverage random key splitting properly
• Profile and optimize hot paths

Performance

• Minimize Python overhead in hot loops
• Use appropriate dtypes
• Batch operations when possible
• Profile with JAX profiler

Common Patterns

• Use pytrees for nested data structures
• Implement custom vjp/jvp when needed
• Leverage sharding for multi-device
• Use checkpointing for memory efficiency