Operator dispatch user guide

This guide describes how to use an operator dispatch system that selects between FlagGems, vendor-specific, and PyTorch reference implementations. The selection follows a priority hierarchy, from highest to lowest:

• User-specific configuration file (YAML)

• Item-specific environment variables

• Platform configuration file (for example, ascend.yaml and cuda.yaml)

• Built-in default values

• Quick start
  • Basic usage
  • Use the Manager
• Configure backend selection
  • Configuration priority
  • User-specified configuration file (YAML)
  • Environment variables
  • Platform-specific configuration
  • Operator List
• Policy context management
• Add new operators and vendor backends
  • Add new operators
  • Multi-process safety