test_data <- list(
c("not", "eat", "them", "here", "or", "there."),
c("not", "eat", "them", "anywhere.")
)
test_that("ngram works with varrying number of `n`", {
expect_equal(
cpp11_ngram(test_data, n = 1L, n_min = 1, delim = "_"),
test_data
)
expect_equal(
cpp11_ngram(test_data, n = 2L, n_min = 2L, delim = "_"),
list(
c("not_eat", "eat_them", "them_here", "here_or", "or_there."),
c("not_eat", "eat_them", "them_anywhere.")
)
)
expect_equal(
cpp11_ngram(test_data, n = 3L, n_min = 3L, delim = "_"),
list(
c("not_eat_them", "eat_them_here", "them_here_or", "here_or_there."),
c("not_eat_them", "eat_them_anywhere.")
)
)
expect_snapshot(
error = TRUE,
cpp11_ngram(test_data, n = 0L, n_min = 0L, delim = "_")
)
expect_snapshot(
error = TRUE,
cpp11_ngram(test_data, n = -1L, n_min = -1L, delim = "_")
)
})
test_that("tokenlist_ngram works with n_min and n", {
tknlist <- list(
c("a", "b", "c", "d", "e"),
c("a", "b"),
c("a"),
character(0)
)
expect_equal(
cpp11_ngram(tknlist, 1, 1, " "),
tknlist
)
expect_equal(
cpp11_ngram(tknlist, 2, 2, " "),
list(
c("a b", "b c", "c d", "d e"),
c("a b"),
character(0),
character(0)
)
)
expect_equal(
cpp11_ngram(tknlist, 3, 3, " "),
list(
c("a b c", "b c d", "c d e"),
character(0),
character(0),
character(0)
)
)
expect_equal(
cpp11_ngram(tknlist, 2, 1, " "),
list(
c("a", "b", "c", "d", "e", "a b", "b c", "c d", "d e"),
c("a", "b", "a b"),
c("a"),
character(0)
)
)
expect_equal(
cpp11_ngram(tknlist, 3, 1, " "),
list(
c("a", "b", "c", "d", "e", "a b", "b c", "c d", "d e", "a b c", "b c d", "c d e"),
c("a", "b", "a b"),
c("a"),
character(0)
)
)
expect_equal(
cpp11_ngram(tknlist, 3, 2, " "),
list(
c("a b", "b c", "c d", "d e", "a b c", "b c d", "c d e"),
c("a b"),
character(0),
character(0)
)
)
})
test_that("ngram works with delim", {
expect_equal(
cpp11_ngram(test_data, n = 3L, n_min = 3L, delim = ""),
list(
c("noteatthem", "eatthemhere", "themhereor", "hereorthere."),
c("noteatthem", "eatthemanywhere.")
)
)
expect_equal(
cpp11_ngram(test_data, n = 3L, n_min = 3L, delim = " "),
list(
c("not eat them", "eat them here", "them here or", "here or there."),
c("not eat them", "eat them anywhere.")
)
)
})
test_that("ngram returns length zero vectors when length(x) < n", {
expect_equal(
cpp11_ngram(list(c("a", "b")), n = 3L, n_min = 3L, delim = "_"),
list(character())
)
expect_equal(
cpp11_ngram(list(c("a")), n = 3L, n_min = 3L, delim = "_"),
list(character())
)
expect_equal(
cpp11_ngram(list(character()), n = 3L, n_min = 3L, delim = "_"),
list(character())
)
})
library(recipes)
library(textrecipes)
test_tibble <- tibble(text = c(
"not eat them here or there.",
"not eat them anywhere."
))
rec <- recipe(~., data = test_tibble)
test_that("ngramming is done correctly", {
rec <- rec %>%
step_tokenize(text) %>%
step_ngram(text, num_tokens = 3, min_num_tokens = 3)
obj <- rec %>%
prep()
expect_equal(
bake(obj, new_data = NULL) %>%
pull(text) %>%
vctrs::field("tokens"),
list(
c("not_eat_them", "eat_them_here", "them_here_or", "here_or_there"),
c("not_eat_them", "eat_them_anywhere")
)
)
expect_equal(dim(tidy(rec, 2)), c(1, 2))
expect_equal(dim(tidy(obj, 2)), c(1, 2))
})
test_that("`n` argument works", {
rec <- rec %>%
step_tokenize(text) %>%
step_ngram(text, num_tokens = 2, min_num_tokens = 2)
obj <- rec %>%
prep()
expect_equal(
bake(obj, new_data = NULL) %>%
pull(text) %>%
vctrs::field("tokens"),
list(
c("not_eat", "eat_them", "them_here", "here_or", "or_there"),
c("not_eat", "eat_them", "them_anywhere")
)
)
})
test_that("ngramming works with min_num_tokens", {
rec <- rec %>%
step_tokenize(text) %>%
step_ngram(text, num_tokens = 3, min_num_tokens = 1)
obj <- rec %>%
prep()
expect_equal(
bake(obj, new_data = NULL) %>%
pull(text) %>%
vctrs::field("tokens"),
list(
c(
"not", "eat", "them", "here", "or", "there",
"not_eat", "eat_them", "them_here", "here_or", "or_there",
"not_eat_them", "eat_them_here", "them_here_or", "here_or_there"
),
c(
"not", "eat", "them", "anywhere",
"not_eat", "eat_them", "them_anywhere",
"not_eat_them", "eat_them_anywhere"
)
)
)
expect_equal(dim(tidy(rec, 2)), c(1, 2))
expect_equal(dim(tidy(obj, 2)), c(1, 2))
})
test_that("`delim` argument works", {
rec <- rec %>%
step_tokenize(text) %>%
step_ngram(text, delim = " ", num_tokens = 3, min_num_tokens = 3)
obj <- rec %>%
prep()
expect_equal(
bake(obj, new_data = NULL) %>%
pull(text) %>%
vctrs::field("tokens"),
list(
c("not eat them", "eat them here", "them here or", "here or there"),
c("not eat them", "eat them anywhere")
)
)
})
test_that("tunable", {
rec <-
recipe(~., data = mtcars) %>%
step_ngram(all_predictors())
rec_param <- tunable.step_ngram(rec$steps[[1]])
expect_equal(rec_param$name, c("num_tokens"))
expect_true(all(rec_param$source == "recipe"))
expect_true(is.list(rec_param$call_info))
expect_equal(nrow(rec_param), 1)
expect_equal(
names(rec_param),
c("name", "call_info", "source", "component", "component_id")
)
})
# Infrastructure ---------------------------------------------------------------
test_that("bake method errors when needed non-standard role columns are missing", {
tokenized_test_data <- recipe(~text, data = test_tibble) %>%
step_tokenize(text) %>%
prep() %>%
bake(new_data = NULL)
rec <- recipe(tokenized_test_data) %>%
update_role(text, new_role = "predictor") %>%
step_ngram(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_ngram(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_ngram(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_ngram(rec)
expect <- tibble(terms = character(), id = character())
expect_identical(tidy(rec, number = 1), expect)
rec <- prep(rec, mtcars)
expect_identical(tidy(rec, number = 1), expect)
})
test_that("printing", {
rec <- rec %>%
step_tokenize(text) %>%
step_ngram(text)
expect_snapshot(print(rec))
expect_snapshot(prep(rec))
})
test_that("tunable is setup to works with extract_parameter_set_dials", {
skip_if_not_installed("dials")
rec <- recipe(~., data = mtcars) %>%
step_ngram(
all_predictors(),
num_tokens = hardhat::tune()
)
params <- extract_parameter_set_dials(rec)
expect_s3_class(params, "parameters")
expect_identical(nrow(params), 1L)
})
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