In library(package, lib.loc = lib.loc, character.only = TRUE, logical.return = TRUE, : there is no package called ‘kknn’

问题：

解决：

完整错误：

问题：

library(mlr)library(tidyverse)

此处使用的数据集包含在mlr包中的fuelsubset.task中；

使用as_tibble函数将数据框dataframe转化为tibble;

使用mlr的getTaskData函数从任务中提取数据；

数据包含119个样本、367个特征；

heatan变量是目标变量；

data("fuelsubset.task")fuel <- getTaskData(fuelsubset.task)fuelTib <- as_tibble(fuel)fuelTib

# A tibble: 129 x 367
heatan h20 UVVIS.UVVIS.1 UVVIS.UVVIS.2 UVVIS.UVVIS.3 UVVIS.UVVIS.4
<dbl> <dbl> <dbl> <dbl> <dbl> <dbl>
1 26.8 2.3 0.874 0.748 0.774 0.747
2 27.5 3 -0.855 -1.29 -0.833 -0.976
3 23.8 2.00 -0.0847 -0.294 -0.202 -0.262
4 18.2 1.85 -0.582 -0.485 -0.328 -0.539
5 17.5 2.39 -0.644 -1.12 -0.665 -0.791
6 20.2 2.43 -0.504 -0.890 -0.662 -0.744
7 15.1 1.92 -0.569 -0.507 -0.454 -0.576
8 20.4 3.61 0.158 0.186 0.0303 0.183
9 26.7 2.5 0.334 0.191 0.0777 0.0410
10 24.9 1.28 0.0766 0.266 0.0808 -0.0733
# ... with 119 more rows, and 361 more variables

数据预处理（为方便数据可视化）

fuelUntidy <- fuelTib %>%mutate(id = 1:nrow(.)) %>%gather(key = "variable", value = "absorbance",c(-heatan, -h20, -id)) %>%mutate(spectrum = str_sub(variable, 1, 3),wavelength = as.numeric(str_extract(variable, "(\\d)+")))fuelUntidy# A tibble: 47,085 x 7heatan   h20    id variable      absorbance spectrum wavelength<dbl> <dbl> <int> <chr>              <dbl> <chr>         <dbl>1   26.8  2.3      1 UVVIS.UVVIS.1     0.874  UVV               12   27.5  3        2 UVVIS.UVVIS.1    -0.855  UVV               13   23.8  2.00     3 UVVIS.UVVIS.1    -0.0847 UVV               14   18.2  1.85     4 UVVIS.UVVIS.1    -0.582  UVV               15   17.5  2.39     5 UVVIS.UVVIS.1    -0.644  UVV               16   20.2  2.43     6 UVVIS.UVVIS.1    -0.504  UVV               17   15.1  1.92     7 UVVIS.UVVIS.1    -0.569  UVV               18   20.4  3.61     8 UVVIS.UVVIS.1     0.158  UVV               19   26.7  2.5      9 UVVIS.UVVIS.1     0.334  UVV               1
10   24.9  1.28    10 UVVIS.UVVIS.1     0.0766 UVV               1
# ... with 47,075 more rows

数据可视化（关系图、分面关系图）

uelUntidy %>%ggplot(aes(absorbance, heatan, col = as.factor(wavelength))) +facet_wrap(~ spectrum, scales = "free_x") +geom_smooth(se = FALSE, size = 0.2) +ggtitle("Absorbance vs heatan for each wavelength") +theme_bw() +theme(legend.position = "none")fuelUntidy %>%ggplot(aes(wavelength, absorbance, group = id, col = heatan)) +facet_wrap(~ spectrum, scales = "free_x") +geom_smooth(se = FALSE, size = 0.2) +ggtitle("Wavelength vs absorbance for each batch") +theme_bw()fuelUntidy %>%ggplot(aes(h20, heatan)) +geom_smooth(se = FALSE) +ggtitle("Humidity vs heatan") +theme_bw()

R语言使用mlr包的makeRegrTask函数创建回归任务、makeLearner函数指定回归学习函数为KNN回归模型

fuelTask <- makeRegrTask(data = fuelTib, target = "heatan")kknn <- makeLearner("regr.kknn")

> kknn <- makeLearner("regr.kknn")
Loading required package: kknn
Error in requirePackages(package, why = stri_paste("learner", id, sep = " "), :
For learner regr.kknn please install the following packages: kknn
In addition: Warning message:
In library(package, lib.loc = lib.loc, character.only = TRUE, logical.return = TRUE, :
there is no package called ‘kknn’

> install.packages("kknn")
trying URL 'https://mirrors.tuna.tsinghua.edu.cn/CRAN/bin/windows/contrib/4.0/kknn_1.3.1.zip'
Content type 'application/zip' length 335586 bytes (327 KB)
downloaded 327 KB

解决：

是因为没有安装kknn包，安装了就好了。

> install.packages("kknn")
trying URL 'https://mirrors.tuna.tsinghua.edu.cn/CRAN/bin/windows/contrib/4.0/kknn_1.3.1.zip'
Content type 'application/zip' length 335586 bytes (327 KB)
downloaded 327 KB

fuelTask <- makeRegrTask(data = fuelTib, target = "heatan")kknn <- makeLearner("regr.kknn")

> kknn
Learner regr.kknn from package kknn
Type: regr
Name: K-Nearest-Neighbor regression; Short name: kknn
Class: regr.kknn
Properties: numerics,factors
Predict-Type: response
Hyperparameters:

完整错误：

参考：https://www.rdocumentation.org/packages/kknn/versions/1.3.1
参考：https://github.com/mlr-org/mlr/issues/1689

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In library(package, lib.loc = lib.loc,character.only = TRUE, there is no package called ‘kknn’

In library(package, lib.loc = lib.loc, character.only = TRUE, logical.return = TRUE, : there is no package called ‘kknn’

问题：

解决：

完整错误：

In library(package, lib.loc = lib.loc,character.only = TRUE, there is no package called ‘kknn’相关推荐

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