DOC Add note on the max number of extmath.cartesian arguments (scikit-learn#16406)

hcars · Henry · rth · web-flow · commit eff1bdf3ee9b · 2020-08-07T22:31:03.000+02:00
Co-authored-by: Henry &lt;hlc5v@virginia.edu&gt;
Co-authored-by: Roman Yurchak &lt;rth.yurchak@gmail.com&gt;
diff --git a/sklearn/utils/extmath.py b/sklearn/utils/extmath.py
@@ -480,6 +480,10 @@ def cartesian(arrays, out=None):
            [3, 5, 6],
            [3, 5, 7]])
 
+    Notes
+    -----
+    This function may not be used on more than 32 arrays
+    because the underlying numpy functions do not support it.
     """
     arrays = [np.asarray(x) for x in arrays]
     shape = (len(x) for x in arrays)
