From 7bd22306fbfebaa2e708397f95f1f1f08d7effc9 Mon Sep 17 00:00:00 2001
From: kinghuin <kinghuin_chull@163.com>
Date: Thu, 17 Sep 2020 10:48:25 +0800
Subject: [PATCH] Update hook.md

---
 docs/Secondary_development/hook.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/docs/Secondary_development/hook.md b/docs/Secondary_development/hook.md
index 8f0a6b0a..0b746b4f 100644
--- a/docs/Secondary_development/hook.md
+++ b/docs/Secondary_development/hook.md
@@ -18,6 +18,8 @@ Task定义了[组网事件](./how_to_define_task.md)和[运行事件](./how_to_d
 如你想要改变任务评价指标，如下示例中将PaddleHub默认的accuracy评价指标改为F1评价指标。同时还想用自定义的可视化工具可视化模型训练过程，如下示例将可视化工具改写为tb-paddle。则你需要改写评估方法log_interval_event。这时候你可以用Hook实现。具体使用方法如下：
 
 ```python
+import time
+
 import numpy as np
 
 def calculate_f1_np(preds, labels):
-- 
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