Basic fix for Jaccard on all zero data (issue #33)

lmcinnes · Dec 5, 2017 · b7ba989 · b7ba989
1 parent a674e0e
commit b7ba989
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/umap/distances.py b/umap/distances.py
@@ -163,7 +163,10 @@ def jaccard(x, y):
         num_non_zero += (x_true or y_true)
         num_equal += (x_true and y_true)
 
-    return float(num_non_zero - num_equal) / num_non_zero
+    if num_non_zero == 0.0:
+        return 1.0
+    else:
+        return float(num_non_zero - num_equal) / num_non_zero
 
 
 @numba.njit()