Problems in examples/Full_loop_single_qubit.ipynb

[frankharkins]

Describe the bug

When running the example notebook, I came across two problems:

1. The following warning appears over 5000 times:

   WARNING:tensorflow:You are casting an input of type complex128 to an incompatible dtype
     float64.  This will discard the imaginary part and may not be what you intended.
   

2. There's an error in code cell 41, although the notebook does continue to execute despite this.
   Traceback

   Error in callback <function _draw_all_if_interactive at 0x1450aaca0> (for post_execute), with arguments args (),kwargs {}:
   
   ---------------------------------------------------------------------------
   ValueError                                Traceback (most recent call last)
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/pyplot.py:197, in _draw_all_if_interactive()
       195 def _draw_all_if_interactive() -> None:
       196     if matplotlib.is_interactive():
   --> 197         draw_all()
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/_pylab_helpers.py:132, in Gcf.draw_all(cls, force)
       130 for manager in cls.get_all_fig_managers():
       131     if force or manager.canvas.figure.stale:
   --> 132         manager.canvas.draw_idle()
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/backend_bases.py:1893, in FigureCanvasBase.draw_idle(self, *args, **kwargs)
      1891 if not self._is_idle_drawing:
      1892     with self._idle_draw_cntx():
   -> 1893         self.draw(*args, **kwargs)
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/backends/backend_agg.py:388, in FigureCanvasAgg.draw(self)
       385 # Acquire a lock on the shared font cache.
       386 with (self.toolbar._wait_cursor_for_draw_cm() if self.toolbar
       387       else nullcontext()):
   --> 388     self.figure.draw(self.renderer)
       389     # A GUI class may be need to update a window using this draw, so
       390     # don't forget to call the superclass.
       391     super().draw()
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/artist.py:95, in _finalize_rasterization.<locals>.draw_wrapper(artist, renderer, *args, **kwargs)
        93 @wraps(draw)
        94 def draw_wrapper(artist, renderer, *args, **kwargs):
   ---> 95     result = draw(artist, renderer, *args, **kwargs)
        96     if renderer._rasterizing:
        97         renderer.stop_rasterizing()
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/artist.py:72, in allow_rasterization.<locals>.draw_wrapper(artist, renderer)
        69     if artist.get_agg_filter() is not None:
        70         renderer.start_filter()
   ---> 72     return draw(artist, renderer)
        73 finally:
        74     if artist.get_agg_filter() is not None:
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/figure.py:3154, in Figure.draw(self, renderer)
      3151         # ValueError can occur when resizing a window.
      3153 self.patch.draw(renderer)
   -> 3154 mimage._draw_list_compositing_images(
      3155     renderer, self, artists, self.suppressComposite)
      3157 for sfig in self.subfigs:
      3158     sfig.draw(renderer)
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/image.py:132, in _draw_list_compositing_images(renderer, parent, artists, suppress_composite)
       130 if not_composite or not has_images:
       131     for a in artists:
   --> 132         a.draw(renderer)
       133 else:
       134     # Composite any adjacent images together
       135     image_group = []
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/artist.py:72, in allow_rasterization.<locals>.draw_wrapper(artist, renderer)
        69     if artist.get_agg_filter() is not None:
        70         renderer.start_filter()
   ---> 72     return draw(artist, renderer)
        73 finally:
        74     if artist.get_agg_filter() is not None:
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/axes/_base.py:3070, in _AxesBase.draw(self, renderer)
      3067 if artists_rasterized:
      3068     _draw_rasterized(self.figure, artists_rasterized, renderer)
   -> 3070 mimage._draw_list_compositing_images(
      3071     renderer, self, artists, self.figure.suppressComposite)
      3073 renderer.close_group('axes')
      3074 self.stale = False
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/image.py:132, in _draw_list_compositing_images(renderer, parent, artists, suppress_composite)
       130 if not_composite or not has_images:
       131     for a in artists:
   --> 132         a.draw(renderer)
       133 else:
       134     # Composite any adjacent images together
       135     image_group = []
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/artist.py:72, in allow_rasterization.<locals>.draw_wrapper(artist, renderer)
        69     if artist.get_agg_filter() is not None:
        70         renderer.start_filter()
   ---> 72     return draw(artist, renderer)
        73 finally:
        74     if artist.get_agg_filter() is not None:
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/lines.py:800, in Line2D.draw(self, renderer)
       797 lc_rgba = mcolors.to_rgba(self._color, self._alpha)
       798 gc.set_foreground(lc_rgba, isRGBA=True)
   --> 800 gc.set_dashes(*self._dash_pattern)
       801 renderer.draw_path(gc, tpath, affine.frozen())
       802 gc.restore()
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/backend_bases.py:965, in GraphicsContextBase.set_dashes(self, dash_offset, dash_list)
       962         raise ValueError(
       963             "All values in the dash list must be non-negative")
       964     if dl.size and not np.any(dl > 0.0):
   --> 965         raise ValueError(
       966             'At least one value in the dash list must be positive')
       967 self._dashes = dash_offset, dash_list
   
   ValueError: At least one value in the dash list must be positive
   
   ---------------------------------------------------------------------------
   ValueError                                Traceback (most recent call last)
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/IPython/core/formatters.py:343, in BaseFormatter.__call__(self, obj)
       341     pass
       342 else:
   --> 343     return printer(obj)
       344 # Finally look for special method names
       345 method = get_real_method(obj, self.print_method)
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/IPython/core/pylabtools.py:152, in print_figure(fig, fmt, bbox_inches, base64, **kwargs)
       149     from matplotlib.backend_bases import FigureCanvasBase
       150     FigureCanvasBase(fig)
   --> 152 fig.canvas.print_figure(bytes_io, **kw)
       153 data = bytes_io.getvalue()
       154 if fmt == 'svg':
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/backend_bases.py:2164, in FigureCanvasBase.print_figure(self, filename, dpi, facecolor, edgecolor, orientation, format, bbox_inches, pad_inches, bbox_extra_artists, backend, **kwargs)
      2161     # we do this instead of `self.figure.draw_without_rendering`
      2162     # so that we can inject the orientation
      2163     with getattr(renderer, "_draw_disabled", nullcontext)():
   -> 2164         self.figure.draw(renderer)
      2165 if bbox_inches:
      2166     if bbox_inches == "tight":
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/artist.py:95, in _finalize_rasterization.<locals>.draw_wrapper(artist, renderer, *args, **kwargs)
        93 @wraps(draw)
        94 def draw_wrapper(artist, renderer, *args, **kwargs):
   ---> 95     result = draw(artist, renderer, *args, **kwargs)
        96     if renderer._rasterizing:
        97         renderer.stop_rasterizing()
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/artist.py:72, in allow_rasterization.<locals>.draw_wrapper(artist, renderer)
        69     if artist.get_agg_filter() is not None:
        70         renderer.start_filter()
   ---> 72     return draw(artist, renderer)
        73 finally:
        74     if artist.get_agg_filter() is not None:
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/figure.py:3154, in Figure.draw(self, renderer)
      3151         # ValueError can occur when resizing a window.
      3153 self.patch.draw(renderer)
   -> 3154 mimage._draw_list_compositing_images(
      3155     renderer, self, artists, self.suppressComposite)
      3157 for sfig in self.subfigs:
      3158     sfig.draw(renderer)
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/image.py:132, in _draw_list_compositing_images(renderer, parent, artists, suppress_composite)
       130 if not_composite or not has_images:
       131     for a in artists:
   --> 132         a.draw(renderer)
       133 else:
       134     # Composite any adjacent images together
       135     image_group = []
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/artist.py:72, in allow_rasterization.<locals>.draw_wrapper(artist, renderer)
        69     if artist.get_agg_filter() is not None:
        70         renderer.start_filter()
   ---> 72     return draw(artist, renderer)
        73 finally:
        74     if artist.get_agg_filter() is not None:
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/axes/_base.py:3070, in _AxesBase.draw(self, renderer)
      3067 if artists_rasterized:
      3068     _draw_rasterized(self.figure, artists_rasterized, renderer)
   -> 3070 mimage._draw_list_compositing_images(
      3071     renderer, self, artists, self.figure.suppressComposite)
      3073 renderer.close_group('axes')
      3074 self.stale = False
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/image.py:132, in _draw_list_compositing_images(renderer, parent, artists, suppress_composite)
       130 if not_composite or not has_images:
       131     for a in artists:
   --> 132         a.draw(renderer)
       133 else:
       134     # Composite any adjacent images together
       135     image_group = []
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/artist.py:72, in allow_rasterization.<locals>.draw_wrapper(artist, renderer)
        69     if artist.get_agg_filter() is not None:
        70         renderer.start_filter()
   ---> 72     return draw(artist, renderer)
        73 finally:
        74     if artist.get_agg_filter() is not None:
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/lines.py:800, in Line2D.draw(self, renderer)
       797 lc_rgba = mcolors.to_rgba(self._color, self._alpha)
       798 gc.set_foreground(lc_rgba, isRGBA=True)
   --> 800 gc.set_dashes(*self._dash_pattern)
       801 renderer.draw_path(gc, tpath, affine.frozen())
       802 gc.restore()
   
   File ~/Documents/testspace/.venv/lib/python3.11/site-packages/matplotlib/backend_bases.py:965, in GraphicsContextBase.set_dashes(self, dash_offset, dash_list)
       962         raise ValueError(
       963             "All values in the dash list must be non-negative")
       964     if dl.size and not np.any(dl > 0.0):
   --> 965         raise ValueError(
       966             'At least one value in the dash list must be positive')
       967 self._dashes = dash_offset, dash_list
   
   ValueError: At least one value in the dash list must be positive
   

To Reproduce

Clone the repo, install:

pip install -e .
pip install notebook

Then run the notebook on OSX.

pip freeze output

absl-py==2.1.0
adaptive==1.1.0
alabaster==0.7.16
anyascii==0.3.2
anyio==4.3.0
appnope==0.1.4
argon2-cffi==23.1.0
argon2-cffi-bindings==21.2.0
arrow==1.3.0
astroid==3.1.0
asttokens==2.4.1
astunparse==1.6.3
async-lru==2.0.4
attrs==23.2.0
Babel==2.14.0
beautifulsoup4==4.12.3
bleach==6.1.0
-e git+https://github.com/frankharkins/c3.git@48b7917eb8d84e1471ff9fb911129c354e752dbf#egg=c3_toolset
cachetools==5.3.3
certifi==2024.2.2
cffi==1.16.0
cfgv==3.4.0
charset-normalizer==3.3.2
cloudpickle==3.0.0
cma==3.3.0
comm==0.2.1
contourpy==1.2.0
coverage==7.4.3
cycler==0.12.1
debugpy==1.8.1
decorator==5.1.1
defusedxml==0.7.1
dill==0.3.8
distlib==0.3.8
dm-tree==0.1.8
docutils==0.20.1
execnet==2.0.2
executing==2.0.1
fastjsonschema==2.19.1
filelock==3.13.1
flatbuffers==23.5.26
fonttools==4.49.0
fqdn==1.5.1
gast==0.5.4
google-auth==2.28.1
google-auth-oauthlib==1.2.0
google-pasta==0.2.0
grpcio==1.62.0
h11==0.14.0
h5py==3.10.0
hjson==3.1.0
httpcore==1.0.4
httpx==0.27.0
identify==2.5.35
idna==3.6
imagesize==1.4.1
iniconfig==2.0.0
ipykernel==6.29.3
ipython==8.22.2
isoduration==20.11.0
jedi==0.19.1
Jinja2==3.1.3
json5==0.9.20
jsonpointer==2.4
jsonschema==4.21.1
jsonschema-specifications==2023.12.1
jupyter-events==0.9.0
jupyter-lsp==2.2.3
jupyter_client==8.6.0
jupyter_core==5.7.1
jupyter_server==2.13.0
jupyter_server_terminals==0.5.2
jupyterlab==4.1.3
jupyterlab_pygments==0.3.0
jupyterlab_server==2.25.3
keras==2.15.0
kiwisolver==1.4.5
libclang==16.0.6
loky==3.4.1
Markdown==3.5.2
markdown-it-py==3.0.0
MarkupSafe==2.1.5
matplotlib==3.8.3
matplotlib-inline==0.1.6
mdurl==0.1.2
mistune==3.0.2
ml-dtypes==0.2.0
mpmath==1.3.0
nbclient==0.9.0
nbconvert==7.16.2
nbformat==5.9.2
nest-asyncio==1.6.0
nodeenv==1.8.0
notebook==7.1.1
notebook_shim==0.2.4
numpy==1.26.4
oauthlib==3.2.2
opt-einsum==3.3.0
overrides==7.7.0
packaging==23.2
pandas==2.2.1
pandocfilters==1.5.1
parso==0.8.3
pbr==6.0.0
pexpect==4.9.0
pillow==10.2.0
platformdirs==4.2.0
pluggy==1.4.0
ply==3.11
pre-commit==3.6.2
prometheus_client==0.20.0
prompt-toolkit==3.0.43
protobuf==4.25.3
psutil==5.9.8
ptyprocess==0.7.0
pure-eval==0.2.2
pyasn1==0.5.1
pyasn1-modules==0.3.0
pycparser==2.21
Pygments==2.17.2
pyparsing==3.1.1
pytest==8.0.2
pytest-cov==4.1.0
pytest-xdist==3.5.0
python-dateutil==2.9.0.post0
python-json-logger==2.0.7
pytz==2024.1
PyYAML==6.0.1
pyzmq==25.1.2
qiskit==0.46.0
qiskit-aer==0.13.3
qiskit-terra==0.46.0
referencing==0.33.0
requests==2.31.0
requests-oauthlib==1.3.1
rfc3339-validator==0.1.4
rfc3986-validator==0.1.1
rich==13.7.1
rpds-py==0.18.0
rsa==4.9
rustworkx==0.14.1
scipy==1.12.0
Send2Trash==1.8.2
six==1.16.0
sniffio==1.3.1
snowballstemmer==2.2.0
sortedcollections==2.1.0
sortedcontainers==2.4.0
soupsieve==2.5
Sphinx==7.2.6
sphinx-autoapi==3.0.0
sphinxcontrib-applehelp==1.0.8
sphinxcontrib-devhelp==1.0.6
sphinxcontrib-htmlhelp==2.0.5
sphinxcontrib-jsmath==1.0.1
sphinxcontrib-qthelp==1.0.7
sphinxcontrib-serializinghtml==1.1.10
stack-data==0.6.3
stevedore==5.2.0
symengine==0.11.0
sympy==1.12
tensorboard==2.15.2
tensorboard-data-server==0.7.2
tensorflow==2.15.0
tensorflow-estimator==2.15.0
tensorflow-io-gcs-filesystem==0.36.0
tensorflow-probability==0.23.0
termcolor==2.4.0
terminado==0.18.0
tinycss2==1.2.1
tornado==6.4
traitlets==5.14.1
types-python-dateutil==2.8.19.20240106
typing_extensions==4.10.0
tzdata==2024.1
uri-template==1.3.0
urllib3==2.2.1
versioningit==3.0.0
virtualenv==20.25.1
wcwidth==0.2.13
webcolors==1.13
webencodings==0.5.1
websocket-client==1.7.0
Werkzeug==3.0.1
wrapt==1.14.1

Expected behavior

No (or very few) warnings and no errors.

Environment (please complete the following information)

• OS: MacOS
• Python Version: 3.11
• c3-toolset Version: Commit 48b7917eb8d84e1471ff9fb911129c354e752dbf from dev branch