Issue Drawing

[njmmerrill]

I tried to make a hierarchical model and use the hcm.to_pygraphviz() function but have missing dependencies. I am using a Windows Machine and installed graphviz, including adding it to the path but still have missing dependencies.

from IPython.display import SVG
from matplotlib_inline.backend_inline import set_matplotlib_formats

from y0.algorithm.identify import Identification, Query, Unidentifiable, identify, identify_outcomes
from y0.dsl import A, P, U, Variable, Y, Z
from y0.examples import hierarchical as hcme
from y0.graph import NxMixedGraph
from y0.hierarchical import (
    HierarchicalCausalModel,
    QVariable,
    augment_collapsed_model,
    collapse_hcm,
    marginalize_augmented_model,
)

set_matplotlib_formats("svg")


def _draw(hcm: HierarchicalCausalModel) -> SVG:
    graph = hcm.to_pygraphviz()
    graph.layout("dot")
    svg = graph.draw(format="svg:cairo").decode("utf8")
    return SVG(svg)

MeanScores, MeanTutoring = Variable("Ȳ_i"), Variable("Ā_i")

school_mean_model = NxMixedGraph.from_edges(
    directed=[(MeanTutoring, MeanScores)], undirected=[(MeanTutoring, MeanScores)]
)

StudentScores, StudentTutoring, SchoolBudget = Variable("Y"), Variable("A"), Variable("U")

hierarchical_model = HierarchicalCausalModel.from_lists(
    observed_subunits=[StudentTutoring, StudentScores],
    unobserved_units=[SchoolBudget],
    edges=[
        (SchoolBudget, StudentTutoring),
        (StudentTutoring, StudentScores),
        (SchoolBudget, StudentScores),
    ],
)

_draw(hierarchical_model)

---------------------------------------------------------------------------
OSError                                   Traceback (most recent call last)
Cell In[9], line 13
      1 StudentScores, StudentTutoring, SchoolBudget = Variable("Y"), Variable("A"), Variable("U")
      3 hierarchical_model = HierarchicalCausalModel.from_lists(
      4     observed_subunits=[StudentTutoring, StudentScores],
      5     unobserved_units=[SchoolBudget],
   (...)     10     ],
     11 )
---> 13 _draw(hierarchical_model)

Cell In[6], line 21, in _draw(hcm)
     19 def _draw(hcm: HierarchicalCausalModel) -> SVG:
     20     graph = hcm.to_pygraphviz()
---> 21     graph.layout("dot")
     22     svg = graph.draw(format="svg:cairo").decode("utf8")
     23     return SVG(svg)

File ~\AppData\Local\miniconda3\envs\y0env\Lib\site-packages\pygraphviz\agraph.py:1479, in AGraph.layout(self, prog, args)
   1462 """Assign positions to nodes in graph.
   1463 
   1464 Optional prog=['neato'|'dot'|'twopi'|'circo'|'fdp'|'nop']
   (...)   1476 
   1477 """
   1478 output_fmt = "dot"
-> 1479 data = self._run_prog(prog, " ".join([args, "-T", output_fmt]))
   1480 self.from_string(data)
   1481 self.has_layout = True

File ~\AppData\Local\miniconda3\envs\y0env\Lib\site-packages\pygraphviz\agraph.py:1400, in AGraph._run_prog(self, prog, args)
   1397 p.wait()
   1399 if not data:
-> 1400     raise OSError(b"".join(errors).decode(self.encoding))
   1402 if len(errors) > 0:
   1403     warnings.warn(b"".join(errors).decode(self.encoding), RuntimeWarning)

OSError: Warning: Could not load "C:\Users\merrill\AppData\Local\miniconda3\envs\y0env\Library\bin\gvplugin_pango.dll" - It was found, so perhaps one of its dependents was not.  Try ldd.

[njmmerrill]

Running ldd in the directory containing gvplugin_pango.dll I found this message among the dependencies:

...
cairo.dll => not found
...