hammer lapx into qbindiff

src/qbindiff/matcher/matcher.py

@@ -22,12 +22,12 @@
 
 # Third-party imports
 import numpy as np
-from lapjv import lapjv  # type: ignore[import-not-found]
 from scipy.sparse import csr_matrix, coo_matrix  # type: ignore[import-untyped]
 
 # Local imports
 from qbindiff.matcher.squares import find_squares  # type: ignore[import-untyped]
 from qbindiff.matcher.belief_propagation import BeliefMWM, BeliefQAP
+from qbindiff.utils import lap
 
 
 if TYPE_CHECKING:
@@ -50,7 +50,7 @@ def solve_linear_assignment(cost_matrix: Matrix) -> RawMapping:
         cost_matrix = cost_matrix.T
     full_cost_matrix = np.zeros((m, m), dtype=cost_matrix.dtype)
     full_cost_matrix[:n, :m] = cost_matrix
-    col_indices = lapjv(full_cost_matrix)[0][:n]
+    col_indices = lap(full_cost_matrix)[:n]
     if transposed:
         return col_indices, np.arange(n)
     return np.arange(n), col_indices

src/qbindiff/utils/__init__.py

@@ -17,4 +17,4 @@
 Collection of utilities used internally.
 """
 
-from .utils import is_debug, iter_csr_matrix, log_once, wrapper_iter
+from .utils import is_debug, iter_csr_matrix, lap, log_once, wrapper_iter

src/qbindiff/utils/utils.py

@@ -23,10 +23,17 @@
 import logging
 from typing import TYPE_CHECKING
 
+try:
+    from lapjv import lapjv as _lap # type: ignore[import-not-found]
+    _is_lapjv = True
+except ImportError:
+    from lap import lapjv as _lap
+    _is_lapjv = False
+
 if TYPE_CHECKING:
     from collections.abc import Generator
     from typing import Any
-    from qbindiff.types import SparseMatrix
+    from qbindiff.types import Matrix, RawMapping, SparseMatrix
 
 
 def is_debug() -> bool:
@@ -49,6 +56,15 @@ def iter_csr_matrix(matrix: SparseMatrix) -> Generator[tuple[int, int, Any], Non
         yield (x, y, v)
 
 
+def lap(cost_matrix: Matrix) -> RawMapping:
+    if _is_lapjv:
+        row_ind_lapjv, _col_ind_lapjv, _ = _lap(cost_matrix)
+        return row_ind_lapjv
+    else:
+        _cost, x, _y = _lap(cost_matrix)
+        return x
+
+
 @cache
 def log_once(level: int, message: str) -> None:
     """