Created
May 28, 2021 07:50
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Fintech Engagement: feature computation
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| class f_user_daysSinceLastTransc(Transformer): | |
| ''' Feature description: Number of days since last transaction. | |
| ''' | |
| @keyword_only | |
| def __init__(self, transc_table, **kwargs): | |
| super(f_user_daysSinceLastTransc, self).__init__() | |
| self.transc_table = transc_table | |
| self.feature_names = "user_daysSinceLastTransc" | |
| def _transform(self, X): | |
| latest_date = (self.transc_table | |
| .agg(f.max("created_date")) | |
| .collect()[0][0]) | |
| last_transction = (self.transc_table.withColumn("rn", f.row_number().over( | |
| Window.partitionBy("user_id").orderBy(f.desc("created_date")))) | |
| .where("rn==1") | |
| .withColumn(self.feature_names, | |
| f.datediff(f.lit(latest_date), col("created_date"))) | |
| .select("user_id", self.feature_names)) | |
| return X.join(last_transction, ["user_id"], "left") |
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