# concrete.ml.onnx.onnx\_model\_manipulations.md

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## module `concrete.ml.onnx.onnx_model_manipulations`

Some code to manipulate models.

***

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### function `simplify_onnx_model`

```python
simplify_onnx_model(onnx_model: ModelProto)
```

Simplify an ONNX model, removes unused Constant nodes and Identity nodes.

**Args:**

* `onnx_model` (onnx.ModelProto): the model to simplify.

***

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### function `remove_unused_constant_nodes`

```python
remove_unused_constant_nodes(onnx_model: ModelProto)
```

Remove unused Constant nodes in the provided onnx model.

**Args:**

* `onnx_model` (onnx.ModelProto): the model for which we want to remove unused Constant nodes.

***

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### function `remove_identity_nodes`

```python
remove_identity_nodes(onnx_model: ModelProto)
```

Remove identity nodes from a model.

**Args:**

* `onnx_model` (onnx.ModelProto): the model for which we want to remove Identity nodes.

***

[![](https://img.shields.io/badge/-source-cccccc?style=flat-square)](https://github.com/zama-ai/concrete-ml/blob/release/1.1.x/src/concrete/ml/onnx/onnx_model_manipulations.py#L78)

### function `keep_following_outputs_discard_others`

```python
keep_following_outputs_discard_others(
    onnx_model: ModelProto,
    outputs_to_keep: Iterable[str]
)
```

Keep the outputs given in outputs\_to\_keep and remove the others from the model.

**Args:**

* `onnx_model` (onnx.ModelProto): the ONNX model to modify.
* `outputs_to_keep` (Iterable\[str]): the outputs to keep by name.

***

[![](https://img.shields.io/badge/-source-cccccc?style=flat-square)](https://github.com/zama-ai/concrete-ml/blob/release/1.1.x/src/concrete/ml/onnx/onnx_model_manipulations.py#L109)

### function `remove_node_types`

```python
remove_node_types(onnx_model: ModelProto, op_types_to_remove: List[str])
```

Remove unnecessary nodes from the ONNX graph.

**Args:**

* `onnx_model` (onnx.ModelProto): The ONNX model to modify.
* `op_types_to_remove` (List\[str]): The node types to remove from the graph.

**Raises:**

* `ValueError`: Wrong replacement by an Identity node.

***

[![](https://img.shields.io/badge/-source-cccccc?style=flat-square)](https://github.com/zama-ai/concrete-ml/blob/release/1.1.x/src/concrete/ml/onnx/onnx_model_manipulations.py#L163)

### function `clean_graph_at_node_op_type`

```python
clean_graph_at_node_op_type(
    onnx_model: ModelProto,
    node_op_type: str,
    fail_if_not_found: bool = True
)
```

Clean the graph of the onnx model by removing nodes at the given node type.

Note: the specified node\_type is also removed.

**Args:**

* `onnx_model` (onnx.ModelProto): The onnx model.
* `node_op_type` (str): The node's op\_type whose following nodes will be removed.
* `fail_if_not_found` (bool): If true, abort if the node op\_type is not found

**Raises:**

* `ValueError`: if fail\_if\_not\_found is set

***

[![](https://img.shields.io/badge/-source-cccccc?style=flat-square)](https://github.com/zama-ai/concrete-ml/blob/release/1.1.x/src/concrete/ml/onnx/onnx_model_manipulations.py#L226)

### function `clean_graph_after_node_op_type`

```python
clean_graph_after_node_op_type(
    onnx_model: ModelProto,
    node_op_type: str,
    fail_if_not_found: bool = True
)
```

Clean the graph of the onnx model by removing nodes after the given node type.

**Args:**

* `onnx_model` (onnx.ModelProto): The onnx model.
* `node_op_type` (str): The node's op\_type whose following nodes will be removed.
* `fail_if_not_found` (bool): If true, abort if the node op\_type is not found

**Raises:**

* `ValueError`: if the node op\_type is not found and if fail\_if\_not\_found is set


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