Fix COMB max_contam empty list issue

Author: KulikDM

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v5.0.0
+    rev: v6.0.0
     hooks:
       - id: trailing-whitespace
       - id: end-of-file-fixer
@@ -14,14 +14,14 @@ repos:
         args: [--fix=lf]
 
   - repo: https://github.com/DanielNoord/pydocstringformatter
-    rev: v0.7.3
+    rev: v0.7.5
     hooks:
       - id: pydocstringformatter
         args: [--style=pep257, --style=numpydoc]
         name: Format docstrings
 
   - repo: https://github.com/asottile/pyupgrade
-    rev: v3.20.0
+    rev: v3.21.2
     hooks:
       - id: pyupgrade
         args: [--py38-plus]
@@ -35,14 +35,14 @@ repos:
         name: Format code style
 
   - repo: https://github.com/PyCQA/isort
-    rev: 6.0.1
+    rev: 7.0.0
     hooks:
       - id: isort
         args: [-m=3]
         name: Sort imports
 
   - repo: https://github.com/charliermarsh/ruff-pre-commit
-    rev: v0.12.8
+    rev: v0.14.7
     hooks:
       - id: ruff
         args: [--exit-non-zero-on-fix, --fix, --line-length=180]

pythresh/thresholds/comb.py

@@ -118,6 +118,10 @@ def eval(self, decision):
                 contam.append(labels)
                 ratio.append(outlier_ratio)
 
+        if not contam:
+            raise ValueError(
+                f"No thresholders had a contamination level below {self.max_contam}. Try increasing max_contam value.")
+
         contam = np.array(contam)
         ratio = np.array(ratio)