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# FXE0008:fx-node-to-onnx

This diagnostic tracks the transformation process from an FX Node to ONNX Operators.

The process of converting FX Node to ONNX Node involves dealing with six distinct node types:

1. `placeholder`: Represents a module input, maps to an ONNX graph input.

2. `call_module`: Symbolizes a call to a submodule, maps to an ONNX

3. `call_method`: Symbolizes a method call. Not yet implemented.

4. `call_function`: Symbolizes a function call. Core ATen is expected as the function call target. The mapping from ATen to ONNX is implemented by ONNXScript torchlib. This guide shows how to write and register a custom symbolic function for call_function FX node.

5. `get_attr`: Indicates an attribute access within the current module. Maps to an ONNX graph initializer.

6. `output`: Represents the module’s output. Maps to an ONNX graph output.

For a granular understanding of how each node type is transformed, refer to the implementation details in `FxOnnxInterpreter`.

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