update app.py

app.py

@@ -36,13 +36,12 @@ def upload_file(files):
 
 
 def create_df(input_file):
-    bytes_data = input_file.value
-    json_string = bytes_data.decode('utf-8')
+    json_string = input_file.decode('utf-8')
     data = json.loads(json_string)
     df = pd.DataFrame(data)
-
     return df
 
+
 # Accuracy Report
 def report_acc(df, groupd='category', metric_type="dual"):
     assert 'split' in df