Update SOTAB.py

SOTAB.py

@@ -117,7 +117,7 @@ class WikiTableQuestions(datasets.GeneratorBasedBuilder):
         # df_ = pd.DataFrame(data)
 
         df_ = pd.read_json(os.path.join(root_dir, table_name), compression='gzip', lines=True)
-        df_ = df_.applymap(str)
+        # df_ = df_.astype({'Fee':'string','Discount':'string'})
         
         col = []
         for j in range(len(df_.loc[0])):
@@ -140,6 +140,7 @@ class WikiTableQuestions(datasets.GeneratorBasedBuilder):
     def _generate_examples(self, main_filepath, root_dir):
 
         df = pd.read_csv(main_filepath,  encoding="utf8")
+        df = df.astype({'table_name':'string','column_index':'string', 'label':'string'})
         for ind in df.index:
             # example_id = ind
             table_name = df['table_name'][ind]