Source code for pennylane.drawer.tape_mpl
# Copyright 2018-2021 Xanadu Quantum Technologies Inc.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
This module a function for generating matplotlib images from a tape.
Developer note: when making changes to this file, you can run
`pennylane/doc/_static/tape_mpl/tape_mpl_examples.py` to generate docstring
images. If you change the docstring examples, please update this file.
"""
# pylint: disable=no-member
from collections import namedtuple
from functools import singledispatch
import pennylane as qml
from pennylane import ops
from pennylane.measurements import MidMeasureMP
from .mpldrawer import MPLDrawer
from .drawable_layers import drawable_layers
from .utils import convert_wire_order, unwrap_controls, cwire_connections, default_bit_map
from .style import _set_style
has_mpl = True
try:
import matplotlib as mpl
except (ModuleNotFoundError, ImportError): # pragma: no cover
has_mpl = False
_Config = namedtuple("_Config", ("decimals", "active_wire_notches", "bit_map", "terminal_layers"))
@singledispatch
def _add_operation_to_drawer(
op: qml.operation.Operator, drawer: MPLDrawer, layer: int, config: _Config
) -> None:
"""Adds the ``op`` to an ``MPLDrawer`` at the designated location.
Args:
op (.Operator): An operator to add to the drawer
drawer (.MPLDrawer): A matplotlib drawer
layer (int): The layer to place the operator in.
config (_Config): named tuple containing ``wire_map``, ``decimals``, and ``active_wire_notches``.
Side Effects:
Adds a depiction of ``op`` to ``drawer``
"""
op_control_wires, control_values = unwrap_controls(op)
target_wires = (
[w for w in op.wires if w not in op_control_wires]
if len(op.wires) != 0
else list(range(drawer.n_wires))
)
if control_values is None:
control_values = [True for _ in op_control_wires]
if op_control_wires:
drawer.ctrl(
layer,
op_control_wires,
wires_target=target_wires,
control_values=control_values,
)
drawer.box_gate(
layer,
target_wires,
op.label(decimals=config.decimals),
box_options={"zorder": 4}, # make sure box and text above control wires if controlled
text_options={"zorder": 5},
active_wire_notches=config.active_wire_notches,
)
@_add_operation_to_drawer.register
def _(op: ops.SWAP, drawer, layer, _) -> None:
drawer.SWAP(layer, list(op.wires))
@_add_operation_to_drawer.register
def _(op: ops.CSWAP, drawer, layer, _):
drawer.ctrl(layer, wires=op.wires[0], wires_target=op.wires[1:])
drawer.SWAP(layer, wires=list(op.wires[1:]))
@_add_operation_to_drawer.register
def _(op: ops.CNOT, drawer, layer, _):
drawer.CNOT(layer, op.wires)
@_add_operation_to_drawer.register
def _(op: ops.Toffoli, drawer, layer, _):
drawer.CNOT(layer, op.wires)
@_add_operation_to_drawer.register
def _(op: ops.MultiControlledX, drawer, layer, _):
drawer.CNOT(layer, op.active_wires, control_values=op.control_values)
@_add_operation_to_drawer.register
def _(op: ops.CZ, drawer, layer, _):
drawer.ctrl(layer, op.wires)
@_add_operation_to_drawer.register
def _(op: ops.CCZ, drawer, layer, _):
drawer.ctrl(layer, op.wires)
@_add_operation_to_drawer.register
def _(op: ops.Barrier, drawer, layer, _):
mapped_wires = op.wires if len(op.wires) != 0 else list(range(drawer.n_wires))
ymin = min(mapped_wires) - 0.5
ymax = max(mapped_wires) + 0.5
# by default, uses rcParams['lines.color'] at time when displayed, not at time when added to figure
# so we have to force it to use the value at the time the line was added to the figure
drawer.ax.vlines(layer - 0.05, ymin=ymin, ymax=ymax, color=mpl.pyplot.rcParams["lines.color"])
drawer.ax.vlines(layer + 0.05, ymin=ymin, ymax=ymax, color=mpl.pyplot.rcParams["lines.color"])
@_add_operation_to_drawer.register
def _(op: ops.WireCut, drawer, layer, _):
ymin = min(op.wires) - 0.5
ymax = max(op.wires) + 0.5
drawer.ax.text(layer - 0.35, y=max(op.wires), s="✂", fontsize=40)
drawer.ax.vlines(layer, ymin=ymin, ymax=ymax, linestyle="--")
@_add_operation_to_drawer.register
def _(op: MidMeasureMP, drawer, layer, _):
text = None if op.postselect is None else str(int(op.postselect))
drawer.measure(layer, op.wires[0], text=text) # assume one wire
if op.reset:
drawer.erase_wire(layer, op.wires[0], 1)
drawer.box_gate(
layer + 1,
op.wires[0],
"|0⟩",
box_options={"zorder": 4},
text_options={"zorder": 5},
)
@_add_operation_to_drawer.register
def _(op: qml.ops.op_math.Conditional, drawer, layer, config) -> None:
drawer.box_gate(
layer,
list(op.wires),
op.then_op.label(decimals=config.decimals),
box_options={"zorder": 4},
text_options={"zorder": 5},
)
sorted_bits = sorted([config.bit_map[m] for m in op.meas_val.measurements])
for b in sorted_bits[:-1]:
erase_right = layer < config.terminal_layers[b]
drawer.cwire_join(layer, b + drawer.n_wires, erase_right=erase_right)
def _get_measured_wires(measurements, wires) -> set:
measured_wires = set()
for m in measurements:
if not m.mv:
# state and probs
if len(m.wires) == 0:
return wires
for wire in m.wires:
measured_wires.add(wire)
return measured_wires
def _add_classical_wires(drawer, layers, wires):
for cwire, (cwire_layers, layer_wires) in enumerate(zip(layers, wires), start=drawer.n_wires):
xs, ys = [], []
len_diff = len(cwire_layers) - len(layer_wires)
if len_diff > 0:
layer_wires += [cwire] * len_diff
for l, w in zip(cwire_layers, layer_wires):
xs.extend([l, l, l])
ys.extend([cwire, w, cwire])
drawer.classical_wire(xs, ys)
def _get_measured_bits(measurements, bit_map, offset):
measured_bits = []
for m in measurements:
if isinstance(m.mv, list):
for mv in m.mv:
measured_bits += [bit_map[mcm] + offset for mcm in mv.measurements]
elif m.mv:
measured_bits += [bit_map[mcm] + offset for mcm in m.mv.measurements]
return measured_bits
def _tape_mpl(tape, wire_order=None, show_all_wires=False, decimals=None, *, fig=None, **kwargs):
"""Private function wrapped with styling."""
wire_options = kwargs.get("wire_options", None)
label_options = kwargs.get("label_options", None)
active_wire_notches = kwargs.get("active_wire_notches", True)
fontsize = kwargs.get("fontsize", None)
wire_map = convert_wire_order(tape, wire_order=wire_order, show_all_wires=show_all_wires)
tape = qml.map_wires(tape, wire_map=wire_map)[0][0]
bit_map = default_bit_map(tape)
layers = drawable_layers(tape.operations, wire_map={i: i for i in tape.wires}, bit_map=bit_map)
for i, layer in enumerate(layers):
if any(isinstance(o, qml.measurements.MidMeasureMP) and o.reset for o in layer):
layers.insert(i + 1, [])
n_layers = len(layers)
n_wires = len(wire_map)
cwire_layers, cwire_wires = cwire_connections(layers + [tape.measurements], bit_map)
drawer = MPLDrawer(
n_layers=n_layers,
n_wires=n_wires,
c_wires=len(bit_map),
wire_options=wire_options,
fig=fig,
)
config = _Config(
decimals=decimals,
active_wire_notches=active_wire_notches,
bit_map=bit_map,
terminal_layers=[cl[-1] for cl in cwire_layers],
)
if n_wires == 0:
return drawer.fig, drawer.ax
if fontsize is not None:
drawer.fontsize = fontsize
drawer.label(list(wire_map), text_options=label_options)
_add_classical_wires(drawer, cwire_layers, cwire_wires)
for layer, layer_ops in enumerate(layers):
for op in layer_ops:
_add_operation_to_drawer(op, drawer, layer, config)
for wire in _get_measured_wires(tape.measurements, list(range(n_wires))):
drawer.measure(n_layers, wire)
measured_bits = _get_measured_bits(tape.measurements, bit_map, drawer.n_wires)
if measured_bits:
drawer.measure(n_layers, measured_bits)
return drawer.fig, drawer.ax
# pylint: disable=too-many-arguments
[docs]def tape_mpl(
tape, wire_order=None, show_all_wires=False, decimals=None, style=None, *, fig=None, **kwargs
):
"""Produces a matplotlib graphic from a tape.
Args:
tape (QuantumTape): the operations and measurements to draw
Keyword Args:
wire_order (Sequence[Any]): the order (from top to bottom) to print the wires of the circuit
show_all_wires (bool): If True, all wires, including empty wires, are printed.
decimals (int): How many decimal points to include when formatting operation parameters.
Default ``None`` will omit parameters from operation labels.
style (str): visual style of plot. Valid strings are ``{'black_white', 'black_white_dark', 'sketch',
'sketch_dark', 'solarized_light', 'solarized_dark', 'default'}``. If no style is specified, the
global style set with :func:`~.use_style` will be used, and the initial default is 'black_white'.
If you would like to use your environment's current rcParams, set `style` to "rcParams".
Setting style does not modify matplotlib global plotting settings.
fontsize (float or str): fontsize for text. Valid strings are
``{'xx-small', 'x-small', 'small', 'medium', large', 'x-large', 'xx-large'}``.
Default is ``14``.
wire_options (dict): matplotlib formatting options for the wire lines
label_options (dict): matplotlib formatting options for the wire labels
active_wire_notches (bool): whether or not to add notches indicating active wires.
Defaults to ``True``.
fig (None or matplotlib Figure): Matplotlib figure to plot onto. If None, then create a new figure.
Returns:
matplotlib.figure.Figure, matplotlib.axes._axes.Axes: The key elements for matplotlib's object oriented interface.
**Example:**
.. code-block:: python
ops = [
qml.QFT(wires=(0,1,2,3)),
qml.IsingXX(1.234, wires=(0,2)),
qml.Toffoli(wires=(0,1,2)),
qml.CSWAP(wires=(0,2,3)),
qml.RX(1.2345, wires=0),
qml.CRZ(1.2345, wires=(3,0))
]
measurements = [qml.expval(qml.Z(0))]
tape = qml.tape.QuantumTape(ops, measurements)
fig, ax = tape_mpl(tape)
fig.show()
.. figure:: ../../_static/tape_mpl/default.png
:align: center
:width: 60%
:target: javascript:void(0);
.. details::
:title: Usage Details
**Decimals:**
The keyword ``decimals`` controls how many decimal points to include when labelling the operations.
The default value ``None`` omits parameters for brevity.
.. code-block:: python
ops = [qml.RX(1.23456, wires=0), qml.Rot(1.2345,2.3456, 3.456, wires=0)]
measurements = [qml.expval(qml.Z(0))]
tape2 = qml.tape.QuantumTape(ops, measurements)
fig, ax = tape_mpl(tape2, decimals=2)
.. figure:: ../../_static/tape_mpl/decimals.png
:align: center
:width: 60%
:target: javascript:void(0);
**Wires:**
The keywords ``wire_order`` and ``show_all_wires`` control the location of wires from top to bottom.
.. code-block:: python
fig, ax = tape_mpl(tape, wire_order=[3,2,1,0])
.. figure:: ../../_static/tape_mpl/wire_order.png
:align: center
:width: 60%
:target: javascript:void(0);
If a wire is in ``wire_order``, but not in the ``tape``, it will be omitted by default. Only by selecting
``show_all_wires=True`` will empty wires be diplayed.
.. code-block:: python
fig, ax = tape_mpl(tape, wire_order=["aux"], show_all_wires=True)
.. figure:: ../../_static/tape_mpl/show_all_wires.png
:align: center
:width: 60%
:target: javascript:void(0);
**Integration with matplotlib:**
This function returns matplotlib figure and axes objects. Using these objects,
users can perform further customization of the graphic.
.. code-block:: python
fig, ax = tape_mpl(tape)
fig.suptitle("My Circuit", fontsize="xx-large")
options = {'facecolor': "white", 'edgecolor': "#f57e7e", "linewidth": 6, "zorder": -1}
box1 = plt.Rectangle((-0.5, -0.5), width=3.0, height=4.0, **options)
ax.add_patch(box1)
ax.annotate("CSWAP", xy=(3, 2.5), xycoords='data', xytext=(3.8,1.5), textcoords='data',
arrowprops={'facecolor': 'black'}, fontsize=14)
.. figure:: ../../_static/tape_mpl/postprocessing.png
:align: center
:width: 60%
:target: javascript:void(0);
**Formatting:**
PennyLane has inbuilt styles for controlling the appearance of the circuit drawings.
All available styles can be determined by evaluating ``qml.drawer.available_styles()``.
Any available string can then be passed via the kwarg ``style`` to change the settings for
that plot. This will not affect style settings for subsequent matplotlib plots.
.. code-block:: python
fig, ax = tape_mpl(tape, style='sketch')
.. figure:: ../../_static/tape_mpl/sketch_style.png
:align: center
:width: 60%
:target: javascript:void(0);
You can also control the appearance with matplotlib's provided tools, see the
`matplotlib docs <https://matplotlib.org/stable/tutorials/introductory/customizing.html>`_ .
For example, we can customize ``plt.rcParams``. To use a customized appearance based on matplotlib's
``plt.rcParams``, ``qml.drawer.tape_mpl`` must be run with ``style="rcParams"``:
.. code-block:: python
plt.rcParams['patch.facecolor'] = 'mistyrose'
plt.rcParams['patch.edgecolor'] = 'maroon'
plt.rcParams['text.color'] = 'maroon'
plt.rcParams['font.weight'] = 'bold'
plt.rcParams['patch.linewidth'] = 4
plt.rcParams['patch.force_edgecolor'] = True
plt.rcParams['lines.color'] = 'indigo'
plt.rcParams['lines.linewidth'] = 5
plt.rcParams['figure.facecolor'] = 'ghostwhite'
fig, ax = tape_mpl(tape, style="rcParams")
.. figure:: ../../_static/tape_mpl/rcparams.png
:align: center
:width: 60%
:target: javascript:void(0);
The wires and wire labels can be manually formatted by passing in dictionaries of
keyword-value pairs of matplotlib options. ``wire_options`` accepts options for lines,
and ``label_options`` accepts text options.
.. code-block:: python
fig, ax = tape_mpl(tape, wire_options={'color':'teal', 'linewidth': 5},
label_options={'size': 20})
.. figure:: ../../_static/tape_mpl/wires_labels.png
:align: center
:width: 60%
:target: javascript:void(0);
"""
restore_params = {}
if update_style := (has_mpl and style != "rcParams"):
restore_params = mpl.rcParams.copy()
_set_style(style)
try:
return _tape_mpl(
tape,
wire_order=wire_order,
show_all_wires=show_all_wires,
decimals=decimals,
fig=fig,
**kwargs,
)
finally:
if update_style:
# we don't want to mess with how it modifies whether the interface is interactive
# but we want to restore everything else
restore_params["interactive"] = mpl.rcParams["interactive"]
mpl.rcParams.update(restore_params)
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