案例编号等于Lime中的数据行编号吗?

时间:2019-01-30 09:24:19

标签: r lime

只是在R中发现了Lime软件包,但仍在尝试全面了解该软件包。我为使用'plot_features'的可视化感到困惑

请原谅我。

我的问题是,每行的案例编号是连续的吗?换句话说,案例416是否等于数据中的行416?如果没有,我如何知道每个案例编号所指的行? Plot of feature weights

用于复制上面图像的示例代码:

library(MASS)
library(lime)
data(biopsy)
biopsy$ID <- NULL
biopsy <- na.omit(biopsy)
biopsy2 = data.frame(ID = 1:nrow(biopsy), biopsy)
names(biopsy2) <- c('ID','clump thickness', 'uniformity of cell size', 
                   'uniformity of cell shape', 'marginal adhesion',
                   'single epithelial cell size', 'bare nuclei', 
                   'bland chromatin', 'normal nucleoli', 'mitoses',
                   'class')
# Now we'll fit a linear discriminant model on all but 4 cases
set.seed(4)
test_set <- sample(seq_len(nrow(biopsy2)), 4)
prediction <- biopsy2$class
biopsy2$class <- NULL
model <- lda(biopsy2[-test_set, ], prediction[-test_set])
predict(model, biopsy2[test_set, ])
explainer <- lime(biopsy2[-test_set,], model, bin_continuous = TRUE, quantile_bins = FALSE)
explanation <- explain(biopsy2[test_set, ], explainer, n_labels = 1, n_features = 4)
plot_features(explanation, ncol = 1)

编辑:在活检表中增加了一个称为ID的列

1 个答案:

答案 0 :(得分:0)

正如您在explanation中所看到的,在该情节中,我们从头开始逐案进行:

head(explanation[, 1:5])
      model_type case  label label_prob  model_r2
1 classification  416 benign  0.9943635 0.5432439
2 classification  416 benign  0.9943635 0.5432439
3 classification  416 benign  0.9943635 0.5432439
4 classification  416 benign  0.9943635 0.5432439
5 classification    7 benign  0.9527375 0.6586789
6 classification    7 benign  0.9527375 0.6586789

但是,由于每种情况都有多行,因此知道对应的行可能不是一个坏主意。为此,您可以使用

which(416 == explanation$case)
# [1] 1 2 3 4

这样

explanation[which(416 == explanation$case), 1:5]
#       model_type case  label label_prob model_r2
# 1 classification  416 benign  0.9949716 0.551287
# 2 classification  416 benign  0.9949716 0.551287
# 3 classification  416 benign  0.9949716 0.551287
# 4 classification  416 benign  0.9949716 0.551287