Fix index error (#118)

Author: mirand863

.github/workflows/test-pr.yml

@@ -13,8 +13,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8"]
-        os: [ubuntu-latest]
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        os: [ubuntu-latest, macOS-latest, windows-latest]
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python ${{ matrix.python-version }}

setup.py

@@ -27,7 +27,7 @@
 KEYWORDS = ["hierarchical classification"]
 DACS_SOFTWARE = "https://gitlab.com/dacs-hpi"
 # What packages are required for this module to be executed?
-REQUIRED = ["networkx", "numpy", "scikit-learn"]
+REQUIRED = ["networkx", "numpy", "scikit-learn", "scipy<1.13"]
 
 # What packages are optional?
 # 'fancy feature': ['django'],}