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我完全新的R和我試圖通過R.R中使用包「neuralnet」預測Weekly_Sales
訓練使用neuralnet包神經網絡的數據來預測測試數據集的Weekly_Sales我已經看過(TRAIN1):
Store Dep Date Temperature Fuel_Price MarkDown1 MarkDown2 MarkDown3 MarkDown4 MarkDown5 CPI Unemployment IsHoliday Rank Weekly_Sales
1 1 5/2/2010 42.31 2.572 -2000 -500 -100 -500 -700 211.0963582 8.106 0 13 24924.50
1 1 12/2/2010 38.51 2.548 -2000 -500 -100 -500 -700 211.2421698 8.106 1 13 46039.49
1 1 19/02/2010 39.93 2.514 -2000 -500 -100 -500 -700 211.2891429 8.106 0 13 41595.55
1 1 26/02/2010 46.63 2.561 -2000 -500 -100 -500 -700 211.3196429 8.106 0 13 19403.54
1 1 5/3/2010 46.50 2.625 -2000 -500 -100 -500 -700 211.3501429 8.106 0 13 21827.90
1 1 12/3/2010 57.79 2.667 -2000 -500 -100 -500 -700 211.3501429 8.106 0 13 21827.90
數據
>ind<- sample(2,nrow(train1),replace= TRUE,prob=c(0.7,0.3))
>train <- train1[ind==1,]
>test <- train1 [ind==2,]
列車的分離
>head(train)
Store Dept Date Temperature Fuel_Price MarkDown1 MarkDown2 MarkDown3 MarkDown4 MarkDown5 CPI Unemployment IsHoliday Rank Weekly_Sales
1 1 5/2/2010 42.31 2.572 -2000 -500 -100 -500 -700 211.0963582 8.106 0 13 24924.50
1 1 26-02-2010 46.63 2.561 -2000 -500 -100 -500 -700 211.3196429 8.106 0 13 19403.54
1 1 5/3/2010 46.50 2.625 -2000 -500 -100 -500 -700 211.3501429 8.106 0 13 21827.90
1 1 19-03-2010 54.58 2.720 -2000 -500 -100 -500 -700 211.2156350 8.106 0 13 22136.64
1 1 26-03-2010 51.45 2.732 -2000 -500 -100 -500 -700 211.0180424 8.106 0 13 26229.21
1 1 2/4/2010 62.27 2.719 -2000 -500 -100 -500 -700 210.8204499 7.808 0 13 57258.43
測試
>head(test)
Store Dept Date Temperature Fuel_Price MarkDown1 MarkDown2 MarkDown3 MarkDown4 MarkDown5 CPI Unemployment IsHoliday Rank Weekly_Sales
1 1 12/2/2010 38.51 2.548 -2000 -500 -100 -500 -700 211.2421698 8.106 1 13 46039.49
1 1 19-02-2010 39.93 2.514 -2000 -500 -100 -500 -700 211.2891429 8.106 0 13 41595.55
1 1 12/3/2010 57.79 2.667 -2000 -500 -100 -500 -700 211.3806429 8.106 0 13 21043.39
1 1 7/5/2010 72.55 2.835 -2000 -500 -100 -500 -700 210.3399684 7.808 0 13 17413.94
1 1 21-05-2010 76.44 2.826 -2000 -500 -100 -500 -700 210.6170934 7.808 0 13 14773.04
1 1 28-05-2010 80.44 2.759 -2000 -500 -100 -500 -700 210.8967606 7.808 0 13 15580.43
我使用容貌的代碼如下:
>library(neuralnet)
>n <-neuralnet(Weekly_Sales~Temperature+Fuel_Price+MarkDown1+MarkDown2+MarkDown3+MarkDown4+MarkDown5+CPI+Unemployment+IsHoliday+Rank,data= train,hidden=c(4,3),err.fct="sse",linear.output=FALSE)
>plot(n)
>output <- compute(n,test[,4:14])
>output1 <- output$net.result*(max(test$Weekly_Sales)-min(test$Weekly_Sales))+min(test$Weekly_Sales)
神經網絡進行訓練,並且它示出範圍中的一個錯誤10^13。此外,我每次都獲得相同的輸出,我正在運行代碼,這些預測甚至與測試數據中的實際Weekly_Sales差不多。我已經使用了另一個部門的數據集,但仍得到相同的預測。
輸出
>head(output$net.result)
[,1]
2 0.9999999998
3 0.9999999998
6 0.9999999998
14 0.9999999998
16 0.9999999998
17 0.9999999998
> head(output1)
[,1]
2 149743.97
3 149743.97
6 149743.97
14 149743.97
16 149743.97
17 149743.97