59 lines
2.3 KiB
Plaintext
59 lines
2.3 KiB
Plaintext
---
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title: pass_manager_drawer
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description: API reference for qiskit.visualization.pass_manager_drawer
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in_page_toc_min_heading_level: 1
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python_api_type: function
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python_api_name: qiskit.visualization.pass_manager_drawer
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---
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# qiskit.visualization.pass\_manager\_drawer
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<Function id="qiskit.visualization.pass_manager_drawer" isDedicatedPage={true} github="https://github.com/qiskit/qiskit/tree/stable/0.21/qiskit/visualization/pass_manager_visualization.py" signature="pass_manager_drawer(pass_manager, filename=None, style=None, raw=False)">
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Draws the pass manager.
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This function needs pydot \<[https://github.com/erocarrera/pydot](https://github.com/erocarrera/pydot)>, which in turn needs Graphviz \<[https://www.graphviz.org/](https://www.graphviz.org/)>\` to be installed.
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**Parameters**
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* **pass\_manager** ([*PassManager*](qiskit.transpiler.PassManager "qiskit.transpiler.PassManager")) – the pass manager to be drawn
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* **filename** (*str*) – file path to save image to
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* **style** (*dict or OrderedDict*) – keys are the pass classes and the values are the colors to make them. An example can be seen in the DEFAULT\_STYLE. An ordered dict can be used to ensure a priority coloring when pass falls into multiple categories. Any values not included in the provided dict will be filled in from the default dict
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* **raw** (*Bool*) – True if you want to save the raw Dot output not an image. The default is False.
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**Returns**
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an in-memory representation of the pass manager. Or None if no image was generated or PIL is not installed.
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**Return type**
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PIL.Image or None
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**Raises**
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* **MissingOptionalLibraryError** – when nxpd or pydot not installed.
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* [**VisualizationError**](qiskit.visualization.VisualizationError "qiskit.visualization.VisualizationError") – If raw=True and filename=None.
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**Example**
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```python
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%matplotlib inline
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from qiskit import QuantumCircuit
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from qiskit.compiler import transpile
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from qiskit.transpiler import PassManager
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from qiskit.visualization import pass_manager_drawer
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from qiskit.transpiler.passes import Unroller
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circ = QuantumCircuit(3)
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circ.ccx(0, 1, 2)
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circ.draw()
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pass_ = Unroller(['u1', 'u2', 'u3', 'cx'])
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pm = PassManager(pass_)
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new_circ = pm.run(circ)
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new_circ.draw(output='mpl')
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pass_manager_drawer(pm, "passmanager.jpg")
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```
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</Function>
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