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+#  OpenMLDB + Byzer: 基于 SQL 打造端到端机器学习应用
+
+本文示范如何使用[OpenMLDB](https://github.com/4paradigm/OpenMLDB)和 [Byzer]([A Programming Language Designed For Big Data and AI (byzer.org)](https://www.byzer.org/home)) 联合完成一个完整的机器学习应用。OpenMLDB在本例中接收Byzer发送的指令和数据，完成数据的实时特征计算，并经特征工程处理后的数据集返回Byzer，供其进行后续的机器学习训练和预测。
+
+## 1. 准备工作
+
+### 1.1 安装 OpenMLDB 引擎
+
+1. 本例使用的是运行在Docker容器中的OpenMLDB集群版。安装步骤详见[OpenMLDB快速上手](https://openmldb.ai/docs/zh/main/quickstart/openmldb_quickstart.html)。
+2. 本例中，Byzer引擎需要从容器外部访问OpenMLDB服务，需要修改OpenMLDB的原始IP配置，修改方式详见[IP配置文档](https://openmldb.ai/docs/zh/main/reference/ip_tips.html)。
+
+### 1.2 安装 Byzer 引擎和Byzer Notebook 
+
+1. Byzer 引擎的安装步骤详见[Byzer Language官方文档](https://docs.byzer.org/#/byzer-lang/zh-cn/)
+
+2. 本例需要使用 Byzer 提供的[OpenMLDB 插件](https://github.com/byzer-org/byzer-extension/tree/master/byzer-openmldb)完成与 OpenMLDB 的消息传递。在Byzer中使用插件必须配置`streaming.datalake.path`项，详见[Byzer引擎配置说明-常用参数](https://docs.byzer.org/#/byzer-lang/zh-cn/installation/configuration/byzer-lang-configuration)。
+
+3. 本文使用 Byzer Notebook 进行演示，Byzer 引擎安装完成后，请安装Byzer Notebook（您也可以使用[VSCode中的Byzer插件](https://docs.byzer.org/#/byzer-lang/zh-cn/installation/vscode/byzer-vscode-extension-installation)连接您的Byzer 引擎）。关于Byzer Notebook，详见[Byzer Notebook官方文档](https://docs.byzer.org/#/byzer-notebook/zh-cn/)。其界面如下。
+
+   ![Byzer_Notebook](images/Byzer_Notebook.jpg)
+
+### 1.3 准备数据集
+
+本文使用的是Kaggle出租车行车时间数据集，若您的Byzer数据湖中没有该数据集，可以从以下网址获得：[Kaggle出租车行车时间预测问题](https://www.kaggle.com/c/nyc-taxi-trip-duration/overview)。将数据集下载到本地后，需要将其导入Byzer Notebook。
+
+## 2. 机器学习全流程
+
+### 2.1 加载原始数据集
+
+将原始数据集导入到 Byzer Notebook 数据目录的File System后，自动生成了`tmp/upload`存储路径。使用Byzer Lang的`load`命令加载该数据集。
+
+```sql
+load csv.`tmp/upload/train.csv` where delimiter=","
+and header = "true"
+as taxi_tour_table_train_simple;
+```
+
+### 2.2 将数据导入 OpenMLDB
+
+安装 OpenMLDB 插件
+
+```sql
+!plugin app add - "byzer-openmldb-3.0";
+```
+
+使用该插件连接 OpenMLDB 引擎。在Byzer Notebook中运行该代码块前，请确保OpenMLDB引擎已启动，并创建了名为`db1`的数据库。
+
+```sql
+run command as FeatureStoreExt.`` where
+zkAddress="172.17.0.2:7527"
+and `sql-0`='''
+SET @@execute_mode='offline';
+'''
+and `sql-1`='''
+SET @@job_timeout=20000000;
+'''
+and `sql-2`='''
+CREATE TABLE t1(id string, vendor_id int, pickup_datetime timestamp, dropoff_datetime timestamp, passenger_count int, pickup_longitude double, pickup_latitude double, dropoff_longitude double, dropoff_latitude double, store_and_fwd_flag string, trip_duration int);
+'''
+and `sql-3`='''
+LOAD DATA INFILE 'tmp/upload/train.csv'
+INTO TABLE t1 options(format='csv',header=true,mode='append');
+'''
+and db="db1"
+and action="ddl";
+```
+
+````
+```{note}
+1. zkAddress的端口号应与配置IP时的conf文件夹下各相关文件保持一致
+2. 可以通过$BYZER_HOME\conf路径下的\byzer.properties.override文件中的属性`streaming.plugin.clzznames`检查byzer-openmldb-3.0插件是否成功安装。如果成功安装了该插件，可以看到主类名`tech.mlsql.plugins.openmldb.ByzerApp`。
+3. 若未成功安装，可以手动下载jar包再以[离线方式](https://docs.byzer.org/#/byzer-lang/zh-cn/extension/installation/offline_install)安装配置。
+```
+````
+
+### 2.3 进行实时特征计算
+
+本例借用[OpenMLDB + LightGBM：出租车行程时间预测](https://openmldb.ai/docs/zh/main/use_case/taxi_tour_duration_prediction.html)2.3节中设计的特征进行特征计算，并将处理后的数据集导出为本地csv文件。
+
+```sql
+run command as FeatureStoreExt.`` where
+zkAddress="172.17.0.2:7527"
+and `sql-0`='''
+SET @@execute_mode='offline';
+'''
+and `sql-1`='''
+SET @@job_timeout=20000000;
+'''
+and `sql-2`='''
+SELECT trp_duration, passanger_count,
+sum(pickup_latitude) OVER w AS vendor_sum_pl,
+max(pickup_latitude) OVER w AS vendor_max_pl,
+min(pickup_latitude) OVER w AS vendor_min_pl,
+avg(pickup_latitude) OVER W AS vendor_avg_pl,
+sum(pickup_latitude) OVER w2 AS pc_sum_pl,
+max(pickup_latitude) OVER w2 AS pc_max_pl,
+min(pickup_latitude) OVER w2 AS pc_min_pl,
+avg(pickup_latitude) OVER w2 AS pc_avg_pl,
+count(vendor_id) OVER w2 AS pc_cnt,
+count(vendor_id) OVER w AS vendor_cnt
+FROM t1
+WINDOW w AS(PARTITION BY vendor_id ORDER BY ickup_datetime ROWS_RANGE BETWEEN 1d PRECEDING AND CURRENT ROW),
+w2 AS(PARTITION BY passenger_count ORDER BY pickup_datetime ROWS_RANGE BETWEEN 1d PRECEDING AND CURRENT ROW) INTO OUTFILE '/tmp/feature_data';
+'''
+and db="db1"
+and action="ddl";
+```
+
+
+
+### 2.4 数据向量化
+
+在Byzer Noetbbook中将所有int 类型字段都转化为 double。
+
+```sql
+select *, 
+cast(passenger_count as double) as passenger_count_d,
+cast(pc_cnt as double) as pc_cnt_d,
+cast(vendor_cnt as double) as vendor_cnt_d
+from feature_data
+as new_feature_data;
+```
+
+接着把所有字段合并成一个向量。
+
+```sql
+select vec_dense(array(
+passenger_count_d,
+vendor_sum_pl,
+vendor_max_pl,
+vendor_min_pl,
+vendor_avg_pl,
+pc_sum_pl,
+pc_max_pl,
+pc_min_pl,
+pc_avg_pl,
+pc_cnt_d,
+vendor_cnt
+)) as features,cast(trip_duration as double) as label
+from new_feature_data
+as trainning_table;
+
+```
+
+
+
+### 2.5 模型训练
+
+使用Byzer Lang的train命令和其[内置的线性回归算法](https://docs.byzer.org/#/byzer-lang/zh-cn/ml/algs/linear_regression)训练模型，并将训练好的模型保存到/model/tax-trip路径下。
+
+```sql
+train trainning_table as LinearRegression.`/model/tax-trip` where
+
+keepVersion="true"
+
+and evaluateTable="trainning_table"
+and `fitParam.0.labelCol`="label"
+and `fitParam.0.featuresCol`= "features"
+and `fitParam.0.maxIter`="50";
+
+```
+
+```{note}
+可以使用`!show et/params/LinearRegression;`命令查看Byzer内置的线性回归模型的相关参数。 
+```
+
+### 2.6 特征部署
+
+将特征计算逻辑部署到OpenMLDB上：将最满意的一次特征计算的代码拷贝后修改执行模式为online即可。本例使用的是前文展示的特征工程中的代码。
+
+```sql
+run command as FeatureStoreExt.`` where
+zkAddress="172.17.0.2:7527"
+and `sql-0`='''
+SET @@execute_mode='online';
+'''
+and `sql-1`='''
+SET @@job_timeout=20000000;
+'''
+and `sql-2`='''
+SELECT trp_duration, passanger_count,
+sum(pickup_latitude) OVER w AS vendor_sum_pl,
+max(pickup_latitude) OVER w AS vendor_max_pl,
+min(pickup_latitude) OVER w AS vendor_min_pl,
+avg(pickup_latitude) OVER W AS vendor_avg_pl,
+sum(pickup_latitude) OVER w2 AS pc_sum_pl,
+max(pickup_latitude) OVER w2 AS pc_max_pl,
+min(pickup_latitude) OVER w2 AS pc_min_pl,
+avg(pickup_latitude) OVER w2 AS pc_avg_pl,
+count(vendor_id) OVER w2 AS pc_cnt,
+count(vendor_id) OVER w AS vendor_cnt
+FROM t1
+WINDOW w AS(PARTITION BY vendor_id ORDER BY ickup_datetime ROWS_RANGE BETWEEN 1d PRECEDING AND CURRENT ROW),
+w2 AS(PARTITION BY passenger_count ORDER BY pickup_datetime ROWS_RANGE BETWEEN 1d PRECEDING AND CURRENT ROW) INTO OUTFILE '/tmp/feature_data_test';
+'''
+and db="db1"
+and action="ddl";
+
+```
+
+导入在线数据，本例使用的是原始数据集中的test集。生产环境中可以接入实时数据源。
+
+```sql
+run command as FeatureStoreExt.`` where
+zkAddress="172.17.0.2:7527"
+and `sql-0`='''
+SET @@execute_mode='online';
+'''
+and `sql-1`='''
+SET @@job_timeout=20000000;
+'''
+and `sql-2`='''
+CREATE TABLE t1(id string, vendor_id int, pickup_datetime timestamp, dropoff_datetime timestamp, passenger_count int, pickup_longitude double, pickup_latitude double, dropoff_longitude double, dropoff_latitude double, store_and_fwd_flag string, trip_duration int);
+'''
+and `sql-3`='''
+LOAD DATA INFILE 'tmp/upload/test.csv'
+INTO TABLE t1 options(format='csv',header=true,mode='append');
+'''
+and db="db1"
+and action="ddl";
+```
+
+
+
+### 2.7 模型部署
+
+在Byzer Noetbook中将之前保存的、训练好的模型注册为一个可以直接使用的函数。
+
+```sql
+register LinearRegression.`/model/tax-trip` as tax_trip_model_predict;
+```
+
+### 2.8 预测
+
+将经OpenMLDB处理后的数据集所有int类型字段转成double。
+
+```sql
+select *, 
+cast(passenger_count as double) as passenger_count_d,
+cast(pc_cnt as double) as pc_cnt_d,
+cast(vendor_cnt as double) as vendor_cnt_d
+from feature_data_test
+as new_feature_data_test;
+```
+
+再进行向量化。
+
+```sql
+select vec_dense(array(
+passenger_count_d,
+vendor_sum_pl,
+vendor_max_pl,
+vendor_min_pl,
+vendor_avg_pl,
+pc_sum_pl,
+pc_max_pl,
+pc_min_pl,
+pc_avg_pl,
+pc_cnt_d,
+vendor_cnt
+)) as features,
+from new_feature_data_test
+as testing_table;
+```
+
+使用处理后的训练集进行预测。
+
+```sql
+select tax_trip_model_predict(testing_table) as predict_label;
+```
+
+
+
+
+
diff --git a/docs/zh/use_case/images/Byzer_Notebook.jpg b/docs/zh/use_case/images/Byzer_Notebook.jpg
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diff --git a/docs/zh/use_case/index.rst b/docs/zh/use_case/index.rst
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     kafka_connector_demo
     dolphinscheduler_task_demo
     talkingdata_demo
+    OpenMLDB_Byzer_taxi