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bug修复 没有导入函数array_join，并且spark2没有这个函数#53

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Commits on Jul 12, 2021

• sql.funtion object has no attribute 'array_join' and don't import array_join function

  lixiang-repo

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  59dbf7e

• UserEmb 和scala版本对齐，应该向量是求平均，而不是求和

  lixiang-repo

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  52d179f

• gbdt+lr算法实现推荐预估

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  bbbaa33

• 修复数据地址

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  942175b