Nothing
library(recipes)
library(textrecipes)
test_data <- tibble(text = c(
"I would not eat them here or there.",
"I would not eat them anywhere.",
"I would not eat green eggs and ham.",
"I do not like them, Sam-I-am."
))
rec <- recipe(~., data = test_data)
test_that("stopwords are removed correctly", {
skip_if_not_installed("stopwords")
rec <- rec %>%
step_tokenize(text) %>%
step_stopwords(text)
obj <- rec %>%
prep()
token_words <- tokenizers::tokenize_words(test_data$text[1])[[1]]
expect_equal(
token_words[!is.element(token_words, stopwords::stopwords())],
bake(obj, new_data = NULL) %>%
slice(1) %>%
pull(text) %>%
vctrs::field("tokens") %>%
unlist()
)
expect_equal(dim(tidy(rec, 2)), c(1, 4))
expect_equal(dim(tidy(obj, 2)), c(1, 4))
})
test_that("stopwords are kept correctly", {
skip_if_not_installed("stopwords")
rec <- rec %>%
step_tokenize(text) %>%
step_stopwords(text, keep = TRUE) %>%
prep()
token_words <- tokenizers::tokenize_words(test_data$text[1])[[1]]
expect_equal(
token_words[is.element(token_words, stopwords::stopwords())],
bake(rec, new_data = NULL) %>%
slice(1) %>%
pull(text) %>%
vctrs::field("tokens") %>%
unlist()
)
})
test_that("custom stopwords are supported", {
custom_stopwords <- c("i", "not")
rec <- rec %>%
step_tokenize(text) %>%
step_stopwords(text, custom_stopword_source = custom_stopwords) %>%
prep()
token_words <- tokenizers::tokenize_words(test_data$text[1])[[1]]
expect_equal(
list(
c("would", "eat", "them", "here", "or", "there"),
c("would", "eat", "them", "anywhere"),
c("would", "eat", "green", "eggs", "and", "ham"),
c("do", "like", "them", "sam", "am")
),
bake(rec, new_data = NULL) %>%
pull(text) %>%
vctrs::field("tokens")
)
})
# Infrastructure ---------------------------------------------------------------
test_that("bake method errors when needed non-standard role columns are missing", {
tokenized_test_data <- recipe(~text, data = test_data) %>%
step_tokenize(text) %>%
prep() %>%
bake(new_data = NULL)
rec <- recipe(tokenized_test_data) %>%
update_role(text, new_role = "predictor") %>%
step_stopwords(text) %>%
update_role(text, new_role = "potato") %>%
update_role_requirements(role = "potato", bake = FALSE)
trained <- prep(rec, training = tokenized_test_data, verbose = FALSE)
expect_error(
bake(trained, new_data = tokenized_test_data[, -1]),
class = "new_data_missing_column"
)
})
test_that("empty printing", {
rec <- recipe(mpg ~ ., mtcars)
rec <- step_stopwords(rec)
expect_snapshot(rec)
rec <- prep(rec, mtcars)
expect_snapshot(rec)
})
test_that("empty selection prep/bake is a no-op", {
rec1 <- recipe(mpg ~ ., mtcars)
rec2 <- step_stopwords(rec1)
rec1 <- prep(rec1, mtcars)
rec2 <- prep(rec2, mtcars)
baked1 <- bake(rec1, mtcars)
baked2 <- bake(rec2, mtcars)
expect_identical(baked1, baked1)
})
test_that("empty selection tidy method works", {
rec <- recipe(mpg ~ ., mtcars)
rec <- step_stopwords(rec)
expect <- tibble(
terms = character(),
value = character(),
keep = logical(),
id = character()
)
expect_identical(tidy(rec, number = 1), expect)
rec <- prep(rec, mtcars)
expect_identical(tidy(rec, number = 1), expect)
})
test_that("printing", {
skip_if_not_installed("stopwords")
rec <- rec %>%
step_tokenize(text) %>%
step_stopwords(text)
expect_snapshot(print(rec))
expect_snapshot(prep(rec))
})
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