Added Flat Transactions

PAMI/extras/graph/flatTransactions.py

@@ -0,0 +1,47 @@
+# The goal of the below is to obtain flat transactions from the output of subgraph mining
+# Flat transactions are transactions that contain the list of subgraphs that are present in a graph
+#
+#   from PAMI.extras.graph import flatTransactions as ft
+#
+#   obj = ft.FlatTransactions()
+#
+#   flatTransactions = obj.getFlatTransactions(fidGidDictMap)
+#   (fidGidDictMap is a list of dictionaries with keys 'FID' and 'GIDs'
+#   FID is subgraph/fragment ID and GIDs are the graph IDs that contain the subgraph)
+#
+#   obj.saveFlatTransactions(oFile)
+
+class FlatTransactions:
+
+    def __init__(self):
+        self.flatTransactions = {}
+    def getFlatTransactions(self, fidGidDictMap):
+        """
+        fidGidMap is a list of dictionaries with keys 'FID' and 'GIDs'
+        An example of this type of output is: getSubgraphGraphMapping in GSpan class
+        from subgraphMining/basic/gspan.py in PAMI
+        """
+        graphToSubgraphs = {}
+
+        for mapping in fidGidDictMap:
+            fid = mapping['FID']
+            gids = mapping['GIDs']
+
+            for gid in gids:
+                if gid not in graphToSubgraphs:
+                    graphToSubgraphs[gid] = []
+                graphToSubgraphs[gid].append(fid)
+
+        for gid in graphToSubgraphs:
+            graphToSubgraphs[gid] = sorted(set(graphToSubgraphs[gid]))
+
+        self.flatTransactions = graphToSubgraphs
+        return self.flatTransactions
+
+    def saveFlatTransactions(self, oFile):
+        """
+        Save the available flat transactions to a file
+        """
+        with open(oFile, 'w') as f:
+            for _, fids in self.flatTransactions.items():
+                f.write(f"{' '.join(map(str, fids))}\n")