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OpenVINO IR Frontend Architecture

OpenVINO IR Frontend uses the pugixml library to parse XML files. After that, based on the version and name of the operation, the Frontend creates the supported operation and initializes it using OpenVINO Visitor API:

flowchart TB
    fw_model[(IR)]
    style fw_model fill:#427cb0
    
    pugixml([pugixml])
    subgraph frontend [ov::frontend::ir::FrontEnd]
        load_impl["load_impl()"]
    end
    fw_model--as stream-->load_impl
    load_impl--load stream-->pugixml
    pugixml--parsed object-->load_impl
    
    
    subgraph input_model [ov::frontend::ir::InputModel]
        convert["convert()"]
    end
    
    load_impl--create-->input_model
    
    xml_deserializer(ov::XmlDeserializer)
    ov_model[ov::Model]
    
    convert--create visitor-->xml_deserializer
    
    xml_deserializer--recursively parse all operations from the model-->ov_model
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Extensions

OpenVINO IR Frontend supports extensions. To add an extension, use ov::frontend::ir::Frontend::add_extension() API. The next extension types are supported:

  • ov::TelemetryExtension - enable telemetry for the frontend
  • ov::BaseOpExtension - enable support of a custom operation
  • ov::detail::SOExtension - allow to support ov::BaseOpExtension extensions loaded from the external library.

See also