qiskit.visualization.pass_manager_drawer

qiskit.visualization.pass_manager_drawer(pass_manager, filename=None, style=None, raw=False)

Draws the pass manager.

This function needs pydot, which in turn needs Graphviz to be installed.

Parameters

• pass_manager (PassManager) – the pass manager to be drawn
• filename (str) – file path to save image to
• 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
• raw (Bool) – True if you want to save the raw Dot output not an image. The default is False.

Returns

an in-memory representation of the pass manager. Or None if no image was generated or PIL is not installed.

Return type

PIL.Image or None

Raises

• MissingOptionalLibraryError – when nxpd or pydot not installed.
• VisualizationError – If raw=True and filename=None.

Example

from qiskit import QuantumCircuit
from qiskit.transpiler import generate_preset_pass_manager
from qiskit.visualization import pass_manager_drawer
 
pm = generate_preset_pass_manager(optimization_level=0)
pass_manager_drawer(pm)