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switch default to numpy pmg building

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Thomas (Tom) C. Gorordo 2026-05-25 18:01:14 -07:00
parent 1a668a7cee
commit 368770d792
Signed by: tgorordo
GPG key ID: 0CBED22BB0D94490
4 changed files with 3010 additions and 9 deletions
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16
src/smithy/rcv.py
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@ -28,20 +28,18 @@ def pmg_from_rcv_polars(ballots: pl.DataFrame) -> rwx.PyDiGraph:
pmg = rwx.PyDiGraph()
nodes = {c: pmg.add_node(c) for c in candidates}
#compressed = ballots.group_by(ballots.columns).len().rename({"len": "count"})
compressed = ballots.group_by(ballots.columns).len().rename({"len": "count"})
exprs = []
pairs = list(combinations(candidates, 2))
for a, b in pairs:
exprs.extend(
[
(pl.col(a) < pl.col(b)).sum().alias(f"{a}>{b}"),
(pl.col(b) < pl.col(a)).sum().alias(f"{b}>{a}"),
]
)
exprs.extend([
pl.when(pl.col(a) < pl.col(b)).then(pl.col("count")).otherwise(0).sum().alias(f"{a}>{b}"),
pl.when(pl.col(b) < pl.col(a)).then(pl.col("count")).otherwise(0).sum().alias(f"{b}>{a}")
])
results = ballots.select(exprs).row(0, named=True)
results = compressed.select(exprs).row(0, named=True)
for a, b in pairs:
a_wins = results[f"{a}>{b}"]
@ -99,7 +97,7 @@ def pmg_from_rcv_numpy(ballots: pl.DataFrame) -> rwx.PyDiGraph:
return pmg
def pmg_from_rcv(ballots: pl.DataFrame, method="polars") -> rwx.PyDiGraph:
def pmg_from_rcv(ballots: pl.DataFrame, method="numpy") -> rwx.PyDiGraph:
if method == "polars":
return pmg_from_rcv_polars(ballots)
elif method == "numpy":