diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index ddac956..b625821 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -203,7 +203,7 @@
   <component name="PropertiesComponent">
     <property name="WebServerToolWindowFactoryState" value="false" />
     <property name="aspect.path.notification.shown" value="true" />
-    <property name="com.android.tools.idea.instantapp.provision.ProvisionBeforeRunTaskProvider.myTimeStamp" value="1588333384466" />
+    <property name="com.android.tools.idea.instantapp.provision.ProvisionBeforeRunTaskProvider.myTimeStamp" value="1588333480672" />
     <property name="go.gopath.indexing.explicitly.defined" value="true" />
     <property name="nodejs_interpreter_path.stuck_in_default_project" value="undefined stuck path" />
     <property name="nodejs_npm_path_reset_for_default_project" value="true" />
diff --git a/serve.py b/serve.py
index 2a7bb9e..7ea3455 100644
--- a/serve.py
+++ b/serve.py
@@ -216,7 +216,7 @@ class MyHandler(BaseHTTPRequestHandler):
 				with open(config.train_data_path, 'r') as f:
 					df = pd.read_csv(config.train_data_path,
 					                 usecols=['job', 'model', 'time', 'utilCPU', 'utilGPU', 'pre', 'main', 'post'])
-					df = df.tail(config.time_step)
+					df = df.tail(config.time_step - 1)
 					df = df.append(data, ignore_index=True)
 					df.to_csv('./data/test_data.csv', index=False)