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[英]Cannot Open Connection Error on Azure ML Studio (Running R Script)
[英]Error deploying azure ML experiment with R script for mining association rules
我在Azure機器學習工作室上創建了一個新實驗,該實驗通過模塊Execute R Script
能夠從起始數據集中挖掘關聯規則。 在本實驗中,我使用了R版本Microsoft R Open 3.2.2
我首先在R Studio上編寫並測試了Azure ML實驗中使用的功能,但我沒有遇到任何問題。 這是我的實驗結構:
這是插入到Azure ML的模塊中的代碼的一部分,該代碼在R Studio上正常運行:
# Map 1-based optional input ports to variables
dataset1 <- maml.mapInputPort(1) # class: data.frame
library("arules")
library("sqldf")
x <- sqldf('select ID_Ordine, AnnoOrdine, ZonaCommerciale, Modello, SUM(Qta) as Qta
from dataset1 group by ID_Ordine, Modello order by ID_Ordine')
a_list1 <- transform(x, Modello = as.factor(Modello),
ID_Ordine = as.factor(ID_Ordine))
transactions <- as(split(x[,"Modello"], x[,"ID_Ordine"]), "transactions")
rules <- sort(apriori(transactions,
parameter = list(supp = 0.1, conf = 0.1, target = "rules",
maxlen = 5)), by="lift")
gi <- generatingItemsets(rules) #remove inverse duplicated rules
d <- which(duplicated(gi)) #remove inverse duplicated rules
rules <- rules[-d] #remove inverse duplicated rules
#create a dataframe to be used as output
result <- data.frame(label_lhs = labels(lhs(rules)),
label_rhs = labels(rhs(rules)),
count = quality(rules)["count"])
# Select data.frame to be sent to the output Dataset port
maml.mapOutputPort("result");
如果我從代碼count = quality(rules)["count"]
(將與計數有關的列導入到輸出數據幀的語句count = quality(rules)["count"]
排除了這一行,則實驗可以正常進行,但是當我也導入count列時,執行實驗給我以下錯誤:
有人知道如何解決此錯誤,或者知道從Azure ML識別的arules對象中選擇count列的另一種方法嗎?
感謝您的任何建議
在此版本的包arules
, count
列不是由函數apriori()
計算的,因此我以這種方式使用反公式計算支持量:
#create a dataframe to be used as output
result <- data.frame(label_lhs = labels(lhs(rules)),
label_rhs = labels(rhs(rules)),
count = quality(rules)$support*length(transactions))
因為支持是使用以下公式計算的:
support = (number of transactions with A&B)/(number of total transactions)
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