Operator Schema Registry With Versioned Operator Definitions And Domain Namespacing

Open Neural Network Exchange

Unique: Uses a C++ registry pattern (onnx/defs/*.cc files) with lazy initialization and domain-based namespacing to support 200+ operators across multiple domains without monolithic registration; operator versioning is enforced at schema level with deprecated operator tracking, enabling safe evolution of operator semantics

vs others: More structured than TensorFlow's op registry because it enforces type constraints and shape inference at schema definition time; more extensible than PyTorch's operator system because domains allow third-party operator contributions without core library changes