change label format

preprocess.py

@@ -48,9 +48,10 @@ class DataProcessor(object):
                 if not line:    continue
                 if '\t' not in line: continue
                 content, label = line.rsplit('\t', 1)
-                if(labels_map.get(label)>=0) :
+                mapped_label = labels_map.get(label)
+                if mapped_label is not None and isinstance(mapped_label, int) and mapped_label >= 0:
                     contents.append(content)
-                    labels.append(int(labels_map.get(label)))
+                    labels.append(mapped_label)
 
         #random shuffle
         index = list(range(len(labels)))