[英]Rolling average and sum by days over timestamp in Pyspark
我有一個 PySpark dataframe ,其中時間戳以天為單位。 以下是 dataframe 的示例(我們稱之為df
):
+-----+-----+----------+-----+
| name| type| timestamp|score|
+-----+-----+----------+-----+
|name1|type1|2012-01-10| 11|
|name1|type1|2012-01-11| 14|
|name1|type1|2012-01-12| 2|
|name1|type3|2012-01-12| 3|
|name1|type3|2012-01-11| 55|
|name1|type1|2012-01-13| 10|
|name1|type2|2012-01-14| 11|
|name1|type2|2012-01-15| 14|
|name2|type2|2012-01-10| 2|
|name2|type2|2012-01-11| 3|
|name2|type2|2012-01-12| 55|
|name2|type1|2012-01-10| 10|
|name2|type1|2012-01-13| 55|
|name2|type1|2012-01-14| 10|
+-----+-----+----------+-----+
在這個 dataframe 中,我想在三天的滾動時間 window 內對不同名稱的分數進行平均,並取其總和。 意思是,對於數據框的任何給定日期,查找該天、考慮日期前一天和考慮日期前一天前一天的name1
總和 1 。 並為name1
的所有日子做類似的事情。 並對各種names
做同樣的練習,即。 name2
等。我該怎么做?
我看了一下這個帖子,並嘗試了以下
from pyspark.sql import SparkSession
from pyspark.sql import functions as F
from pyspark.sql.window import Window
days = lambda i: i*1
w_rolling = Window.orderBy(F.col("timestamp").cast("long")).rangeBetween(-days(3), 0)
df_agg = df.withColumn("rolling_average", F.avg("score").over(w_rolling)).withColumn(
"rolling_sum", F.sum("score").over(w_rolling)
)
df_agg.show()
+-----+-----+----------+-----+------------------+-----------+
| name| type| timestamp|score| rolling_average|rolling_sum|
+-----+-----+----------+-----+------------------+-----------+
|name1|type1|2012-01-10| 11|18.214285714285715| 255|
|name1|type1|2012-01-11| 14|18.214285714285715| 255|
|name1|type1|2012-01-12| 2|18.214285714285715| 255|
|name1|type3|2012-01-12| 3|18.214285714285715| 255|
|name1|type3|2012-01-11| 55|18.214285714285715| 255|
|name1|type1|2012-01-13| 10|18.214285714285715| 255|
|name1|type2|2012-01-14| 11|18.214285714285715| 255|
|name1|type2|2012-01-15| 14|18.214285714285715| 255|
|name2|type2|2012-01-10| 2|18.214285714285715| 255|
|name2|type2|2012-01-11| 3|18.214285714285715| 255|
|name2|type2|2012-01-12| 55|18.214285714285715| 255|
|name2|type1|2012-01-10| 10|18.214285714285715| 255|
|name2|type1|2012-01-13| 55|18.214285714285715| 255|
|name2|type1|2012-01-14| 10|18.214285714285715| 255|
+-----+-----+----------+-----+------------------+-----------+
如您所見,我總是得到相同的滾動平均值和滾動總和,這只不過是所有天的列score
的平均值和總和。 這不是我想要的。
您可以使用以下代碼片段創建上述 dataframe:
df_Stats = Row("name", "type", "timestamp", "score")
df_stat1 = df_Stats("name1", "type1", "2012-01-10", 11)
df_stat2 = df_Stats("name1", "type1", "2012-01-11", 14)
df_stat3 = df_Stats("name1", "type1", "2012-01-12", 2)
df_stat4 = df_Stats("name1", "type3", "2012-01-12", 3)
df_stat5 = df_Stats("name1", "type3", "2012-01-11", 55)
df_stat6 = df_Stats("name1", "type1", "2012-01-13", 10)
df_stat7 = df_Stats("name1", "type2", "2012-01-14", 11)
df_stat8 = df_Stats("name1", "type2", "2012-01-15", 14)
df_stat9 = df_Stats("name2", "type2", "2012-01-10", 2)
df_stat10 = df_Stats("name2", "type2", "2012-01-11", 3)
df_stat11 = df_Stats("name2", "type2", "2012-01-12", 55)
df_stat12 = df_Stats("name2", "type1", "2012-01-10", 10)
df_stat13 = df_Stats("name2", "type1", "2012-01-13", 55)
df_stat14 = df_Stats("name2", "type1", "2012-01-14", 10)
df_stat_lst = [
df_stat1,
df_stat2,
df_stat3,
df_stat4,
df_stat5,
df_stat6,
df_stat7,
df_stat8,
df_stat9,
df_stat10,
df_stat11,
df_stat12,
df_stat13,
df_stat14
]
df = spark.createDataFrame(df_stat_lst)
您可以使用下面的代碼來計算過去 3 天(包括當天)的得分總和和平均值。
# Considering the dataframe already created using code provided in question
df = df.withColumn('unix_time', F.unix_timestamp('timestamp', 'yyyy-MM-dd'))
winSpec = Window.partitionBy('name').orderBy('unix_time').rangeBetween(-2*86400, 0)
df = df.withColumn('rolling_sum', F.sum('score').over(winSpec))
df = df.withColumn('rolling_avg', F.avg('score').over(winSpec))
df.orderBy('name', 'timestamp').show(20, False)
+-----+-----+----------+-----+----------+-----------+------------------+
|name |type |timestamp |score|unix_time |rolling_sum|rolling_avg |
+-----+-----+----------+-----+----------+-----------+------------------+
|name1|type1|2012-01-10|11 |1326153600|11 |11.0 |
|name1|type3|2012-01-11|55 |1326240000|80 |26.666666666666668|
|name1|type1|2012-01-11|14 |1326240000|80 |26.666666666666668|
|name1|type1|2012-01-12|2 |1326326400|85 |17.0 |
|name1|type3|2012-01-12|3 |1326326400|85 |17.0 |
|name1|type1|2012-01-13|10 |1326412800|84 |16.8 |
|name1|type2|2012-01-14|11 |1326499200|26 |6.5 |
|name1|type2|2012-01-15|14 |1326585600|35 |11.666666666666666|
|name2|type1|2012-01-10|10 |1326153600|12 |6.0 |
|name2|type2|2012-01-10|2 |1326153600|12 |6.0 |
+-----+-----+----------+-----+----------+-----------+------------------+
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.