Nonzero misalignments (#42)

* feat: detect nonzero misalignments

* bug: fixed alignment detection

---------

Co-authored-by: anna-grim <[email protected]>

Author: anna-grim

src/segmentation_skeleton_metrics/skeleton_metric.py

@@ -345,7 +345,6 @@ def detect_splits(self):
                 label_i = pred_graph.nodes[i]["pred_id"]
                 label_j = pred_graph.nodes[j]["pred_id"]
                 if is_split(label_i, label_j):
-                    # pred_graph = gutils.remove_edge(pred_graph, i, j)
                     dfs_edges, pred_graph = self.is_nonzero_misalignment(
                         target_graph, pred_graph, dfs_edges, i, j
                     )
@@ -396,7 +395,7 @@ def is_zero_misalignment(
         """
         # Search
         black_hole = False
-        collision_labels = set([pred_graph.nodes[nb]["pred_id"]])
+        collision_labels = set()
         queue = [root]
         visited = set()
         while len(queue) > 0:
@@ -806,7 +805,7 @@ def is_split(a, b):
         Indication of whether there is a split.
 
     """
-    return (a != 0 and b != 0) and (a != b)
+    return (a > 0 and b > 0) and (a != b)
 
 
 def remove_edge(dfs_edges, edge):