---
title: "ClikaRT::graph::OnnxExportOptions"
sidebar_label: "OnnxExportOptions"
description: "How ModelGraph::export_onnx and io::OnnxModel::from_graph write a graph as an ONNX model."
---

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**Header:** `ClikaRT/graph/model_graph.h`

How [`ModelGraph::export_onnx`](./ModelGraph.md#export_onnx) and [`io::OnnxModel::from_graph`](../io/OnnxModel.md#from_graph) write a graph as an ONNX model.

## Data members

### opset\_version {#opset_version}

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`std::int64_t` **`opset_version`** `= 0`

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The `ai.onnx` opset the model imports; 0 or less takes the library's default. An operator whose ONNX form needs a newer opset is written as a composition of older operators, or refused, naming the opset.

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Declared in `ClikaRT/graph/model_graph.h`, line 104

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### contrib\_ops {#contrib_ops}

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`bool` **`contrib_ops`** `= true`

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Whether the model may use the `com.microsoft` operators (for example GroupQueryAttention or MatMulNBits). The domain is imported only when an operator uses it.

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Declared in `ClikaRT/graph/model_graph.h`, line 108

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### optimize {#optimize}

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`bool` **`optimize`** `= true`

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Simplify the written model before it is returned: pairs of transposes that undo each other compose, and nodes no output reads are dropped.

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Declared in `ClikaRT/graph/model_graph.h`, line 111

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### save\_as\_external\_data {#save_as_external_data}

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`std::optional<bool>` **`save_as_external_data`**

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Where the weights go when the model is saved: unset writes them to a `<stem>_data` file beside the model once they pass 2 GiB, `true` always does, and `false` never does.

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Declared in `ClikaRT/graph/model_graph.h`, line 115

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### producer\_name {#producer_name}

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`std::string` **`producer_name`**

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The producer name the model records; empty takes the library's.

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Declared in `ClikaRT/graph/model_graph.h`, line 117

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### handlers {#handlers}

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`std::vector<`[`OnnxExportHandler`](./OnnxExportHandler.md)`>` **`handlers`**

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Handlers that write chosen operators your way, in this export only ([`OnnxExportHandler`](./OnnxExportHandler.md), [onnx\_export.h](./index.md#onnx_export-h)). The list is checked before any node is written: an operator named twice, an empty handler, or one for [`OpCode::Unknown`](./index.md#OpCode) or `OpCode::Custom` refuses with InvalidArgument.

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Declared in `ClikaRT/graph/model_graph.h`, line 122

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