set.seed(1234)
library(recipes)
library(textrecipes)
library(modeldata)
data(tate_text)
n_rows <- 100
rec <- recipe(~ medium + artist, data = tate_text[seq_len(n_rows), ])
test_that("step_lda works as intended", {
skip_if_not_installed("text2vec")
skip_if_not_installed("data.table")
data.table::setDTthreads(2) # because data.table uses all cores by default
n_top <- 10
rec1 <- rec %>%
step_tokenize(medium) %>%
step_lda(medium, num_topics = n_top)
obj <- rec1 %>%
prep()
expect_equal(dim(bake(obj, new_data = NULL)), c(n_rows, n_top + 1))
expect_equal(dim(tidy(rec1, 1)), c(1, 3))
expect_equal(dim(tidy(obj, 1)), c(1, 3))
})
test_that("step_lda works with num_topics argument", {
skip_if_not_installed("text2vec")
skip_if_not_installed("data.table")
data.table::setDTthreads(2) # because data.table uses all cores by default
n_top <- 100
rec1 <- rec %>%
step_tokenize(medium) %>%
step_lda(medium, num_topics = n_top)
obj <- rec1 %>%
prep()
expect_equal(dim(bake(obj, new_data = NULL)), c(n_rows, n_top + 1))
})
test_that("check_name() is used", {
skip_if_not_installed("text2vec")
skip_if_not_installed("data.table")
data.table::setDTthreads(2) # because data.table uses all cores by default
dat <- tate_text[seq_len(100), ]
dat$text <- dat$medium
dat$lda_text_1 <- dat$text
rec <- recipe(~., data = dat) %>%
step_tokenize(text) %>%
step_lda(text)
expect_snapshot(
error = TRUE,
prep(rec, training = dat)
)
})
# Infrastructure ---------------------------------------------------------------
test_that("bake method errors when needed non-standard role columns are missing", {
skip_if_not_installed("text2vec")
skip_if_not_installed("data.table")
data.table::setDTthreads(2) # because data.table uses all cores by default
tokenized_test_data <- rec %>%
step_tokenize(medium) %>%
prep() %>%
bake(new_data = NULL)
rec <- recipe(tokenized_test_data) %>%
update_role(medium, new_role = "predictor") %>%
step_lda(medium, num_topics = 10) %>%
update_role(medium, 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_lda(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_lda(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_lda(rec)
expect <- tibble(
terms = character(),
num_topics = integer(),
id = character()
)
expect_identical(tidy(rec, number = 1), expect)
rec <- prep(rec, mtcars)
expect_identical(tidy(rec, number = 1), expect)
})
test_that("keep_original_cols works", {
skip_if_not_installed("text2vec")
skip_if_not_installed("data.table")
data.table::setDTthreads(2) # because data.table uses all cores by default
new_names <- paste0("lda_medium_", 1:10)
rec <- recipe(~ medium, data = tate_text[seq_len(n_rows), ]) %>%
step_tokenize(medium) %>%
step_lda(medium, keep_original_cols = FALSE)
rec <- prep(rec)
res <- bake(rec, new_data = NULL)
expect_equal(
colnames(res),
new_names
)
rec <- recipe(~ medium, data = tate_text[seq_len(n_rows), ]) %>%
step_tokenize(medium) %>%
step_lda(medium, keep_original_cols = TRUE)
rec <- prep(rec)
res <- bake(rec, new_data = NULL)
expect_equal(
colnames(res),
c("medium", new_names)
)
})
test_that("keep_original_cols - can prep recipes with it missing", {
skip_if_not_installed("text2vec")
skip_if_not_installed("data.table")
data.table::setDTthreads(2) # because data.table uses all cores by default
rec <- recipe(~ medium, data = tate_text[seq_len(n_rows), ]) %>%
step_tokenize(medium) %>%
step_lda(medium, keep_original_cols = TRUE)
rec$steps[[2]]$keep_original_cols <- NULL
expect_snapshot(
rec <- prep(rec)
)
expect_error(
bake(rec, new_data = tate_text[seq_len(n_rows), ]),
NA
)
})
test_that("printing", {
skip_if_not_installed("text2vec")
skip_if_not_installed("data.table")
data.table::setDTthreads(2) # because data.table uses all cores by default
rec <- rec %>%
step_tokenize(medium) %>%
step_lda(medium)
expect_snapshot(print(rec))
expect_snapshot(prep(rec))
})
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