fix data type for ddparser output (#2422)

Author: linjieccc

paddlenlp/taskflow/dependency_parsing.py

@@ -337,7 +337,7 @@ def _postprocess(self, inputs):
         arcs = inputs['arcs']
         rels = inputs['rels']
         words = inputs['words']
-        arcs = [[s for s in seq] for seq in arcs]
+        arcs = [[s.item() for s in seq] for seq in arcs]
         rels = [self.rel_vocab.to_tokens(seq) for seq in rels]
 
         results = []