# Exits
if (!requireNamespace("earth", quietly = TRUE)) {
exit_file("Package earth missing")
}
# Load required packages
suppressMessages({
library(earth)
})
# Generate Friedman benchmark data
friedman1 <- gen_friedman(seed = 101, n_bins = 2)
# Fit model(s)
fit <- earth::earth(y ~ ., degree = 2, data = friedman1)
# Compute VI scores
vis_nsubsets <- vi_model(fit)
vis_rss <- vi_model(fit, type = "rss")
vis_gcv <- vi_model(fit, type = "gcv")
vis_earth <- earth::evimp(fit)
# Expectations for `vi_model()`
expect_identical(
current = vis_nsubsets[seq_len(nrow(vis_earth)), ]$Importance,
target = unname(vis_earth[, "nsubsets", drop = TRUE])
)
expect_identical(
current = vis_rss[seq_len(nrow(vis_earth)), ]$Importance,
target = unname(vis_earth[, "rss", drop = TRUE])
)
expect_identical(
current = vis_gcv[seq_len(nrow(vis_earth)), ]$Importance,
target = unname(vis_earth[, "gcv", drop = TRUE])
)
# Expectations for `get_training_data()`
expect_identical(
current = vip:::get_training_data.earth(fit),
target = friedman1
)
# Expectations for `get_feature_names()`
expect_identical(
current = vip:::get_feature_names.earth(fit),
target = paste0("x", 1L:10L)
)
# Call `vip::vip()` directly
p <- vip(fit, method = "model", include_type = TRUE)
# Expect `p` to be a `"gg" "ggplot"` object
expect_identical(
current = class(p),
target = c("gg", "ggplot")
)
# Display VIPs side by side
grid.arrange(
vip(vis_nsubsets, include_type = TRUE),
vip(vis_rss, include_type = TRUE),
vip(vis_gcv, include_type = TRUE),
p,
nrow = 2
)
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