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冷啟動 DropoutNet 算法的介紹請參考這篇文章：《冷啟動推薦模型DropoutNet深度解析與改進》。

準備離線訓練樣本

使用模板生成sql代碼，構建離線訓練樣本。

模板配置：

{
  "cold_start_recall": {
    "model_name": "cold_start",
    "model_type": "dropoutnet",
    "label": {
      "name": "is_click",
      "selection": "max(if(event=\"click\", 1, 0))",
      "type": "CLASSIFICATION"
    },
    "train_days": 14
  }
}

訓練 DropoutNet 模型

使用 Pai 命令訓練模型

pai -name easy_rec_ext
-Dcmd='train'
-Dconfig='oss://${bucket}/EasyRec/sv_dropout_net/sv_dropoutnet.config'
-Dtrain_tables='odps://${project}/tables/dwd_samples_for_dropoutnet/dt=${bizdate}'
-Deval_tables='odps://${project}/tables/dwd_sv_cold_start_samples/dt=${bizdate}'
-Dboundary_table='odps://${project}/tables/cold_start_feature_binning'
-Dmodel_dir='oss://${bucket}/EasyRec/sv_dropout_net/${bizdate}'
-Dedit_config_json='{"train_config.fine_tune_checkpoint":"oss://${bucket}/EasyRec/sv_dropout_net/${yesterday}/"}'
-Dbuckets='oss://${bucket}/'
-Darn='acs:ram::XXXXXXXXXXX:role/aliyunodpspaidefaultrole'
-DossHost='oss-cn-beijing-internal.aliyuncs.com'
-Dcluster='{
  \"ps\": {
  \"count\" : 1,
  \"cpu\" : 800
  },
  \"worker\" : {
  \"count\" : 9,
  \"cpu\" : 800
  }
}';

拆分模型為User Embedding子模型和Item Embedding子模型

pai -name tensorflow1120_cpu_ext
-Dscript='oss://${bucket}/EasyRec/sv_dropout_net/split_model_pai_v2.py'
-Dbuckets='oss://${bucket}/'
-Darn='acs:ram::XXXXXXXXXXXX:role/aliyunodpspaidefaultrole'
-DossHost='oss-cn-beijing-internal.aliyuncs.com'
-DuserDefinedParameters='--model_dir=oss://${bucket}/EasyRec/sv_dropout_net/${bizdate}/export/final --user_model_dir=oss://${bucket}/EasyRec/sv_dropout_net/${bizdate}/export/user --item_model_dir=oss://${bucket}/EasyRec/sv_dropout_net/${bizdate}/export/item';

部署模型服務

部署腳本

bizdate=$1
cat << EOF > eas_config.json
{
    "name": "sv_dropoutnet",
    "metadata": {
        "cpu": 2,
        "instance": 1,
        "memory": 6000
    },
    "processor": "tensorflow_cpu",
    "model_path": "oss://${bucket}/EasyRec/sv_dropout_net/${bizdate}/export/item/"
}
EOF

# 創建服務
 /home/admin/usertools/tools/eascmd \
 -i ${accessId} \
 -k ${accessKey} \
 -e pai-eas.cn-beijing.aliyuncs.com create eas_config.json

# 更新服務 
#/home/admin/usertools/tools/eascmd \
# -i ${accessId} \
# -k ${accessKey} \
# -e pai-eas.cn-beijing.aliyuncs.com \
# modify sv_dropoutnet -s eas_config.json

# 查看服務
echo "-------------------查看服務-------------------"
/home/admin/usertools/tools/eascmd \
-i ${accessId} \
-k ${accessKey} \
-e pai-eas.cn-beijing.aliyuncs.com desc sv_dropoutnet

計算實時特征

1. Flink 接入 item table 的 binlog

Flink里創建Hologres item 表的 binlog；創建新品item的視圖 View。

create TEMPORARY table item_table_binlog (
  hg_binlog_lsn BIGINT,
  hg_binlog_event_type BIGINT,
  hg_binlog_timestamp_us BIGINT,
  itemId bigint,
  ...
  createTime TIMESTAMP,
  ets AS TO_TIMESTAMP(FROM_UNIXTIME(hg_binlog_timestamp_us / 1000000)),
  WATERMARK FOR ets AS ets - INTERVAL '5' MINUTE
) with (
  'connector'='hologres',
  'endpoint' = 'hgpostcn-cn-XXXXXX-cn-beijing-vpc.hologres.aliyuncs.com:80',
  'username' = '${username}',
  'password' = '${passowrod}',
  'dbname' = '${dbname}',
  'tablename' = 'item_table',
  'binlog' = 'true',
  'binlogMaxRetryTimes' = '10',
  'binlogRetryIntervalMs' = '500',
  'binlogBatchReadSize' = '256',
  'startTime' = '2022-03-03 00:00:00'
);

CREATE TEMPORARY VIEW if NOT EXISTS new_item_view
AS
SELECT itemId, ..., createTime,
  PROCTIME() AS proc_time, ets
FROM smart_video_binlog
WHERE hg_binlog_event_type IN (5, 7) --INSERT=5, AFTER_UPDATE=7
AND createTime >= CURRENT_TIMESTAMP - INTERVAL '24' HOUR
;

2. Join item 特征

先創建好Holo的Item Feature Table，然后在Flink上創建臨時表，作為Sink的目標表。

create TEMPORARY table item_cold_start_feature (
  itemId bigint,
  ...
  update_time bigint
) with (
  'connector'='hologres',
  'dbname'='${dbname}',
  'tablename'='sv_rec.sv_cold_start_feature',
  'username'='${user_name}',
  'password'='${password}',
  'endpoint'='hgpostcn-cn-xxxxxxxxxx-cn-beijing-vpc.hologres.aliyuncs.com:80',
  'mutatetype'='insertorupdate'
);

INSERT INTO item_cold_start_feature
SELECT 
  v.itemId,
  v.userId AS author,
  s.primaryId AS primary_type,
  v.title,
  TIMESTAMPDIFF(DAY, v.createTime, LOCALTIMESTAMP) AS pub_days,
  v.duration,
  v.sourceType as source_type,
  v.inTimeOrNot as intimeornot,
  v.is_prop,
  COALESCE(s.gradeScore, v.gradeScore) AS grade_score,
  v.width,
  v.height,
  v.firstPublishSongOrNot AS is_first_publish_song,
  COALESCE(v.topic_id, '') as topic_id,
  t.cate_name1,
  t.cate_name2,
  t.video_tags,
  au.author_gender,
  au.author_level,
  au.author_is_member,
  au.author_city,
  au.author_type,
  au.author_fans_num,
  au.author_visitor_num,
  au.author_billboard_num,
  au.author_av_ct,
  au.author_sv_ct,
  au.author_play_ct,
  au.author_play_avg_ct,
  au.author_like_ct,
  au.author_download_ct,
  au.family_hot_ranking,
  au.author_diamond_ct,
  au.author_flower_ct,
  CAST(STR_TO_MAP(au.author_sv_type_play_ct_1, ',', ':')[CAST(s.primaryId as VARCHAR)] AS bigint) AS author_sv_type_play_ct_1,
  CAST(STR_TO_MAP(au.author_sv_type_play_ct_7, ',', ':')[CAST(s.primaryId as VARCHAR)] AS bigint) AS author_sv_type_play_ct_7,
  CAST(STR_TO_MAP(au.author_sv_type_play_ct_15, ',', ':')[CAST(s.primaryId as VARCHAR)] AS bigint) AS author_sv_type_play_ct_15,
  au.author_play_ct_1,
  au.author_play_ct_7,
  au.author_play_ct_15,
  au.author_like_ct_1,
  au.author_like_ct_7,
  au.author_like_ct_15,
  au.author_comment_ct_1,
  au.author_comment_ct_7,
  au.author_comment_ct_15,
  au.author_share_ct_1,
  au.author_share_ct_7,
  au.author_share_ct_15,
  au.author_tags,
  TIMESTAMPDIFF(DAY, au.author_last_live_time, LOCALTIMESTAMP) AS author_last_live_days,
  UNIX_TIMESTAMP() as update_time,
  t.name_embedding,
  t.tag_embedding
FROM new_item_view AS v
LEFT JOIN author_feature FOR SYSTEM_TIME AS OF v.proc_time as au
ON v.userId = au.author_id
LEFT JOIN smart_video_sign FOR SYSTEM_TIME AS OF v.proc_time as s
ON v.smartVideoId = s.svid
LEFT JOIN video_name_tag_embedding FOR SYSTEM_TIME AS OF v.proc_time as t
ON v.smartVideoId = t.svid
;

3. 生成新 Item Embedding

創建 item embedding 的Hologres table 和 flink 臨時表，作為Sink的目標表。

create TEMPORARY table item_dropoutnet_embedding (
  itemId    bigint,
  embedding ARRAY<FLOAT>,
  update_time bigint
) with (
  'connector'='hologres',
  'dbname'='${dbname}',
  'tablename'='sv_rec.sv_dropoutnet_embedding',
  'username'='${username}',
  'password'='${password}',
  'endpoint'='hgpostcn-cn-xxxxxxxxxxxx-cn-beijing-vpc.hologres.aliyuncs.com:80',
  'mutatetype'='insertorreplace',
  'field_delimiter'=','
);

開發一個調用DropoutNet模型EAS服務的Udf, 在flink sql中調用udf，實時生成item embedding，存入Hologres供線上使用。

INSERT INTO item_dropoutnet_embedding
SELECT
  f.svid,
  InvokeEasUdf(
    'sv_dropoutnet',
    f.primary_type,
    f.title,
    f.pub_days,
    f.duration,
    f.source_type,
    f.intimeornot,
    f.is_prop,
    f.grade_score,
    f.width,
    f.height,
    f.is_first_publish_song,
    f.topic_id,
    COALESCE(t.cate_name1, f.cate_name1),
    COALESCE(t.cate_name2, f.cate_name2),
    COALESCE(t.video_tags, f.video_tags),
    f.author_gender,
    f.author_level,
    f.author_is_member,
    f.author_city,
    f.author_type,
    f.author_fans_num,
    f.author_visitor_num,
    f.author_billboard_num,
    f.author_av_ct,
    f.author_sv_ct,
    f.author_play_ct,
    f.author_play_avg_ct,
    f.author_like_ct,
    f.author_download_ct,
    f.family_hot_ranking,
    f.author_diamond_ct,
    f.author_flower_ct,
    f.author_sv_type_play_ct_1,
    f.author_sv_type_play_ct_7,
    f.author_sv_type_play_ct_15,
    f.author_play_ct_1,
    f.author_play_ct_7,
    f.author_play_ct_15,
    f.author_like_ct_1,
    f.author_like_ct_7,
    f.author_like_ct_15,
    f.author_comment_ct_1,
    f.author_comment_ct_7,
    f.author_comment_ct_15,
    f.author_share_ct_1,
    f.author_share_ct_7,
    f.author_share_ct_15,
    f.author_tags,
    f.author_last_live_days,
    COALESCE(t.name_embedding, f.name_embedding),
    COALESCE(t.tag_embedding, f.tag_embedding)
  ) as embedding,
  UNIX_TIMESTAMP() as update_time
FROM video_name_tag_embedding_hi as t
JOIN sv_cold_start_feature FOR SYSTEM_TIME AS OF t.proc_time as f
ON t.svid = f.svid and t.hg_binlog_event_type IN (5, 7);

準備用戶Embedding向量

離線計算好用戶特征，并用前面步驟拆分出來的用戶子模型生成用戶Embedding向量。

pai -name easy_rec_ext
-Dcmd='predict'
-Dconfig='oss://${bucket}/EasyRec/sv_dropout_net/sv_dropoutnet.config'
-Doutput_table='odps://${project}/tables/dropoutnet_user_embedding/dt=${bizdate}'
-Dinput_table='odps://${project}/tables/dropoutnet_user_features/dt=${bizdate}'
-Dsaved_model_dir='oss://${bucket}/EasyRec/sv_dropout_net/${bizdate}/export/final'
-Dreserved_cols="userid"
-Doutput_cols="user_emb string"
-Dmodel_outputs="user_emb"
-Dbuckets='oss://${bucket}/'
-Darn='acs:ram::XXXXXXXXXX:role/aliyunodpspaidefaultrole'
-DossHost='oss-cn-beijing-internal.aliyuncs.com'
-Dcluster='{
    \"worker\" : {
        \"count\" : 8,
        \"cpu\" : 600
    }
}';

最終，用戶Embedding向量需要導入到Hologres。

檢索Top N個Item 作為召回結果

在推薦服務中使用向量檢索引擎（hologres）查詢與用戶Embedding向量距離最近的Top N個Item。

func (r *ItemColdStartRecall) GetRetrieveSql(userEmb string) (string, []interface{}) {
    sb := sqlbuilder.PostgreSQL.NewSelectBuilder()
    vecIndex := sb.Args.Add(userEmb)
    dotProduct := fmt.Sprintf("pm_approx_inner_product_distance(%s,%s)", r.VectorEmbeddingField, vecIndex)
    sb.Select(r.VectorKeyField, sb.As(dotProduct, "distance"))
    sb.From(r.VectorTable)
    sb.OrderBy("distance").Desc()
    sb.Limit(r.recallCount)
    return sb.Build()
}

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DropoutNet 模型的訓練和部署