Fix issue in Graph and update to 1.3.1

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "spektral"
-version = "1.2.0"
+version = "1.3.1"
 authors = [
     { name="Daniele Grattarola", email="[email protected]" },
 ]

spektral/__init__.py

@@ -1,3 +1,3 @@
 from . import datasets, layers, utils
 
-__version__ = "1.2.0"
+__version__ = "1.3.1"

spektral/data/graph.py

@@ -71,7 +71,7 @@ def __init__(self, x=None, a=None, e=None, y=None, **kwargs):
                     f"rank {len(x.shape)}"
                 )
         if a is not None:
-            if not (isinstance(a, np.ndarray) or sp.isspmatrix(a)):
+            if not (isinstance(a, np.ndarray) or sp.issparse(a)):
                 raise ValueError(f"Unsupported type {type(a)} for a")
             if len(a.shape) != 2:
                 raise ValueError(