Update prediction.py

Author: lmcinnes

hdbscan/prediction.py

@@ -108,7 +108,7 @@ def __init__(self, data, condensed_tree, min_samples,
         raw_condensed_tree = condensed_tree._raw_tree
 
         self.cluster_map = {c: n for n, c in enumerate(sorted(list(selected_clusters)))}
-        self.reverse_cluster_map = {n: c for c, n in cluster_map.items()}
+        self.reverse_cluster_map = {n: c for c, n in self.cluster_map.items()}
 
         self.cluster_tree = raw_condensed_tree[raw_condensed_tree['child_size']
                                                > 1]