partially implemented the function

Signed-off-by: Aryan Roy <[email protected]>

pywhy_graphs/algorithms/pag.py

@@ -7,9 +7,12 @@
 import numpy as np
 
 from pywhy_graphs import ADMG, CPDAG, PAG, StationaryTimeSeriesPAG
-from pywhy_graphs.algorithms.generic import single_source_shortest_mixed_path
+from pywhy_graphs.algorithms.generic import single_source_shortest_mixed_path, valid_mag
 from pywhy_graphs.typing import Node, TsNode
 
+from dodiscover.constraint.fcialg import FCI
+from dodiscover.ci import Oracle
+
 logger = logging.getLogger()
 
 __all__ = [
@@ -1193,4 +1196,13 @@ def valid_pag(G: PAG):
     is_valid : bool
         The MAG constructed from the PAG.
     """
+
+     # check if the graph is a vald PAG 
+     converted_mag = pag_to_mag(G)
+     valid_mag = valid_mag(converted_mag)
+
+     # convert the mag back to a pag
+
+     # check if the converted pag is equivalent to the original
+
      return True