def test_lookups_to_from_disk_via_vocab():
table_name = "test"
vocab = Vocab()
vocab.lookups.add_table(table_name, {"foo": "bar", "hello": "world"})
assert table_name in vocab.lookups
with make_tempdir() as tmpdir:
vocab.to_disk(tmpdir)
new_vocab = Vocab()
new_vocab.from_disk(tmpdir)
assert len(new_vocab.lookups) == len(vocab.lookups)
assert table_name in new_vocab.lookups
table = new_vocab.lookups.get_table(table_name)
assert len(table) == 2
assert table["hello"] == "world"
def test_serialize_vocab_lex_attrs_disk(strings, lex_attr):
vocab1 = Vocab(strings=strings)
vocab2 = Vocab()
vocab1[strings[0]].norm_ = lex_attr
assert vocab1[strings[0]].norm_ == lex_attr
assert vocab2[strings[0]].norm_ != lex_attr
with make_tempdir() as d:
file_path = d / "vocab"
vocab1.to_disk(file_path)
vocab2 = vocab2.from_disk(file_path)
assert vocab2[strings[0]].norm_ == lex_attr
def test_serialize_vocab_lex_attrs_disk(strings, lex_attr):
vocab1 = Vocab(strings=strings)
vocab2 = Vocab()
vocab1[strings[0]].norm_ = lex_attr
assert vocab1[strings[0]].norm_ == lex_attr
assert vocab2[strings[0]].norm_ != lex_attr
with make_tempdir() as d:
file_path = d / "vocab"
vocab1.to_disk(file_path)
vocab2 = vocab2.from_disk(file_path)
assert vocab2[strings[0]].norm_ == lex_attr
def test_floret_vectors(floret_vectors_vec_str, floret_vectors_hashvec_str):
nlp = English()
nlp_plain = English()
# load both vec and hashvec tables
with make_tempdir() as tmpdir:
p = tmpdir / "test.hashvec"
with open(p, "w") as fileh:
fileh.write(floret_vectors_hashvec_str)
convert_vectors(nlp, p, truncate=0, prune=-1, mode="floret")
p = tmpdir / "test.vec"
with open(p, "w") as fileh:
fileh.write(floret_vectors_vec_str)
convert_vectors(nlp_plain, p, truncate=0, prune=-1)
word = "der"
# ngrams: full padded word + padded 2-grams + padded 3-grams
ngrams = nlp.vocab.vectors._get_ngrams(word)
assert ngrams == ["<der>", "<d", "de", "er", "r>", "<de", "der", "er>"]
# rows: 2 rows per ngram
rows = OPS.xp.asarray(
[
h % nlp.vocab.vectors.shape[0] for ngram in ngrams
for h in nlp.vocab.vectors._get_ngram_hashes(ngram)
],
dtype="uint32",
)
assert_equal(
OPS.to_numpy(rows),
numpy.asarray([5, 6, 7, 5, 8, 2, 8, 9, 3, 3, 4, 6, 7, 3, 0, 2]),
)
assert len(rows) == len(ngrams) * nlp.vocab.vectors.hash_count
# all vectors are equivalent for plain static table vs. hash ngrams
for word in nlp_plain.vocab.vectors:
word = nlp_plain.vocab.strings.as_string(word)
assert_almost_equal(nlp.vocab[word].vector,
nlp_plain.vocab[word].vector,
decimal=3)
# every word has a vector
assert nlp.vocab[word * 5].has_vector
# n_keys is -1 for floret
assert nlp_plain.vocab.vectors.n_keys > 0
assert nlp.vocab.vectors.n_keys == -1
# check that single and batched vector lookups are identical
words = [s for s in nlp_plain.vocab.vectors]
single_vecs = OPS.to_numpy(
OPS.asarray([nlp.vocab[word].vector for word in words]))
batch_vecs = OPS.to_numpy(nlp.vocab.vectors.get_batch(words))
assert_equal(single_vecs, batch_vecs)
# an empty key returns 0s
assert_equal(
OPS.to_numpy(nlp.vocab[""].vector),
numpy.zeros((nlp.vocab.vectors.shape[0], )),
)
# an empty batch returns 0s
assert_equal(
OPS.to_numpy(nlp.vocab.vectors.get_batch([""])),
numpy.zeros((1, nlp.vocab.vectors.shape[0])),
)
# an empty key within a batch returns 0s
assert_equal(
OPS.to_numpy(nlp.vocab.vectors.get_batch(["a", "", "b"])[1]),
numpy.zeros((nlp.vocab.vectors.shape[0], )),
)
# the loaded ngram vector table cannot be modified
# except for clear: warning, then return without modifications
vector = list(range(nlp.vocab.vectors.shape[1]))
orig_bytes = nlp.vocab.vectors.to_bytes(exclude=["strings"])
with pytest.warns(UserWarning):
nlp.vocab.set_vector("the", vector)
assert orig_bytes == nlp.vocab.vectors.to_bytes(exclude=["strings"])
with pytest.warns(UserWarning):
nlp.vocab[word].vector = vector
assert orig_bytes == nlp.vocab.vectors.to_bytes(exclude=["strings"])
with pytest.warns(UserWarning):
nlp.vocab.vectors.add("the", row=6)
assert orig_bytes == nlp.vocab.vectors.to_bytes(exclude=["strings"])
with pytest.warns(UserWarning):
nlp.vocab.vectors.resize(shape=(100, 10))
assert orig_bytes == nlp.vocab.vectors.to_bytes(exclude=["strings"])
with pytest.raises(ValueError):
nlp.vocab.vectors.clear()
# data and settings are serialized correctly
with make_tempdir() as d:
nlp.vocab.to_disk(d)
vocab_r = Vocab()
vocab_r.from_disk(d)
assert nlp.vocab.vectors.to_bytes() == vocab_r.vectors.to_bytes()
assert_equal(OPS.to_numpy(nlp.vocab.vectors.data),
OPS.to_numpy(vocab_r.vectors.data))
assert_equal(nlp.vocab.vectors._get_cfg(), vocab_r.vectors._get_cfg())
assert_almost_equal(
OPS.to_numpy(nlp.vocab[word].vector),
OPS.to_numpy(vocab_r[word].vector),
decimal=6,
)
class NlPipe:
"""
class for creating LDA models using sklearn. Deprecated as gensim is used.
"""
def __init__(self,
list_of_docs,
document_ids=None,
language_model="en_core_web_lg",
tagger=False,
parser=False,
ner=False,
categorization=False,
remove_stopwords=True,
remove_punctuation=True,
set_lower=True,
remove_num=True,
expand_stopwords=True,
language_detection=False,
allowed_languages=frozenset({'en'})):
"""
:param list_of_docs: List of strings where every document is one string.
:param document_ids: The ids of the documents, matching the order of the list_of_docs
:param language_model: Spacy language model to be used for text preprocessing
:param tagger: Use spacy part-of-speech tagger.
:param parser: Use spacy to annotate syntactic dependencies in documents.
:param ner: Use spacy for entity recognition and annotation.
:param categorization: Use spacy to assign document labels
:param remove_stopwords: Remove stop words during text preprocessing.
:param remove_punctuation: Remove punctuation during text prssing.
:param set_lower: Convert all strings to lowercase during text preprocessing.
:param remove_num: Remove numeric characters during text preprocessing.
:param expand_stopwords: Remove non-alpha-characters in stop words and add them to the stop words.
:param language_detection: Detect language of docs.
:param allowed_languages: Allowed language for the documents.
"""
self.pipe_disable = []
if not tagger:
self.pipe_disable.append("tagger")
if not parser:
self.pipe_disable.append("parser")
if not ner:
self.pipe_disable.append("ner")
if not categorization:
self.pipe_disable.append("textcat")
self.remove_punctuation = remove_punctuation
self.remove_stop_words = remove_stopwords
self.remove_num = remove_num
self.set_lower = set_lower
self.input_docs = list_of_docs
self.document_ids = document_ids
self.nlp = spacy.load(language_model)
if expand_stopwords:
stops = [stop for stop in self.nlp.Defaults.stop_words]
for stop in stops:
self.nlp.Defaults.stop_words.add(re.sub(r"[\W]", "", stop))
self.spacy_docs = None
self.processed_docs = None
self.vectorizer = None
self.bag_of_words = None
self.tf_idf = None
self.preprocessing_batch_size = 500
self.processes = multiprocessing.cpu_count() - 2
self.lda_model = None
self.lda_output = None
self.grid_search = None
self.evaluation_output = None
self.result_df = None
self.word_topic_df = None
self.word_topic_intersection = None
self.intersection_score = None
self.allowed_languages = allowed_languages
self.language_detection = language_detection
self.spacy_vocab = None
self.word_distance_dict = None
self.word_topic_distance_sum = 0
self.unigram_dict = None
self.bigram_dict = None
def enable_pipe_component(self, component):
if component in self.pipe_disable:
self.pipe_disable.remove(component)
#todo: add info if not in list from beginning or if successfully enable
def disable_pipe_component(self, component):
if component not in self.pipe_disable:
self.pipe_disable.append(component)
# todo: add info if not in list from beginning or if successfully enable
def preprocess_spacy(self):
# todo: add language check
if self.language_detection:
self.spacy_docs = [
doc for doc in tqdm(self.nlp.pipe(
self.input_docs,
disable=self.pipe_disable,
n_process=self.processes,
batch_size=self.preprocessing_batch_size),
desc="Preprocessing text with spacy: ")
if detect(doc.text) in self.allowed_languages
]
else:
self.spacy_docs = [
doc for doc in tqdm(self.nlp.pipe(
self.input_docs,
disable=self.pipe_disable,
n_process=self.processes,
batch_size=self.preprocessing_batch_size),
desc="Preprocessing text with spacy: ")
]
def preprocess(self):
self.processed_docs = []
if not self.spacy_docs:
self.preprocess_spacy()
for spacy_doc in tqdm(
self.spacy_docs,
desc="Removing stop words/punctuation/numeric chars: "):
doc = []
for token in spacy_doc:
if not self.remove_stop_words and token.is_stop:
word = token.text
elif token.is_stop:
continue
else:
word = token.text
if self.set_lower:
word = word.lower()
if self.remove_num:
word = re.sub(r"[\d]", "", word)
if self.remove_punctuation:
word = re.sub(r"[\W]", "", word)
if len(word) >= 2:
doc.append(word)
self.processed_docs.append(doc)
def create_bag_of_words(self, n_grams=(1, 1), min_df=0.01, max_df=0.6):
self.preprocess_spacy()
self.preprocess()
joined_docs = []
for doc in self.processed_docs:
joined_docs.append(" ".join(doc))
self.vectorizer = CountVectorizer(lowercase=False,
ngram_range=n_grams,
min_df=min_df,
max_df=max_df)
self.bag_of_words = self.vectorizer.fit_transform(joined_docs)
def create_tf_idf(self, n_grams=(1, 1), min_df=0.01, max_df=0.6):
self.preprocess_spacy()
self.preprocess()
joined_docs = []
for doc in self.processed_docs:
joined_docs.append(" ".join(doc))
self.vectorizer = TfidfVectorizer(lowercase=False,
ngram_range=n_grams,
min_df=min_df,
max_df=max_df)
self.tf_idf = self.vectorizer.fit_transform(joined_docs)
def create_lda_model(self, no_topics=10, input_type="bag"):
self.lda_model = LDA(n_jobs=self.processes, n_components=no_topics)
if input_type == "bag":
if self.bag_of_words is None:
self.create_bag_of_words()
self.lda_output = self.lda_model.fit_transform(self.bag_of_words)
else:
self.create_tf_idf()
self.lda_output = self.lda_model.fit_transform(self.tf_idf)
def search_best_model(self,
n_components=[2, 3, 4, 5, 10, 15, 20, 25],
learning_decay=[.5, .7, .9],
input_type="bag"):
lda_model = LDA()
self.grid_search = GridSearchCV(lda_model, {
"n_components": n_components,
"learning_decay": learning_decay
})
if input_type == "bag":
if self.bag_of_words is None:
self.create_bag_of_words()
self.grid_search.fit(self.bag_of_words)
else:
if self.tf_idf is None:
self.create_tf_idf()
self.grid_search.fit(self.tf_idf)
def create_document_topic_df(self,
model=None,
no_topics=10,
input_type="bag",
input_matrix=None):
if model is None:
self.create_lda_model(no_topics=no_topics, input_type=input_type)
else:
self.lda_model = model
if input_matrix is not None:
self.evaluation_output = self.lda_model.fit_transform(input_matrix)
elif input_type == "bag":
self.evaluation_output = self.lda_model.fit_transform(
self.bag_of_words)
else:
self.evaluation_output = self.lda_model.fit_transform(self.tf_idf)
self.result_df = pd.DataFrame(self.evaluation_output)
if self.document_ids is not None and not self.language_detection:
self.result_df.index = self.document_ids
elif self.document_ids is not None and self.language_detection:
raise Warning(
"Using document ids and language detection together is not implemented (yet)."
)
dominant_topic = np.argmax(self.result_df.values, axis=1)
self.result_df['dominant_topic'] = dominant_topic
def plot_document_topic_distribution(self):
#todo: log normalize
counter = Counter(self.result_df.dominant_topic)
topic_dict = OrderedDict(
sorted(counter.items(), key=lambda x: x[1], reverse=True))
sns.barplot(x=list(topic_dict.values()),
y=list(topic_dict.keys()),
order=list(topic_dict.keys()),
orient='h')
plt.show()
def evaluate_model(self, no_words=30):
keywords = np.array(self.vectorizer.get_feature_names())
topic_keywords = []
for topic_weights in self.lda_model.components_:
top_keyword_locations = (-topic_weights).argsort()[:no_words]
topic_keywords.append(keywords.take(top_keyword_locations))
self.word_topic_df = pd.DataFrame(
topic_keywords, columns=[f"word_{x}" for x in range(no_words)])
def evaluate_pyldavis(self):
panel = pyLDAvis.sklearn.prepare(self.lda_model, self.bag_of_words,
self.vectorizer)
pyLDAvis.show(panel)
def get_word_topic_intersection(self, no_words=30, no_topics=10):
if not isinstance(self.word_topic_df, pd.DataFrame):
self.evaluate_model(no_words=no_words)
elif isinstance(
self.word_topic_df,
pd.DataFrame) and self.word_topic_df.shape[1] != no_words:
self.evaluate_model(no_words=no_words)
intersection_list = []
intersection_score = 0
all_combinations = [
combo for combo in combinations(range(no_topics), 2)
]
for x in range(no_topics):
temp_list = []
for y in range(no_topics):
if x != y:
temp_list.append(
len(
set(self.word_topic_df[self.word_topic_df.index ==
x].values[0]).
intersection(self.word_topic_df[
self.word_topic_df.index == y].values[0])) /
no_words)
if (x, y) in all_combinations:
intersection_score += len(
set(self.word_topic_df[self.word_topic_df.index == x].
values[0]).intersection(
self.word_topic_df[self.word_topic_df.index ==
y].values[0])) / no_words
else:
temp_list.append(1)
intersection_list.append(temp_list)
self.intersection_score = intersection_score / len(all_combinations)
self.word_topic_intersection = pd.DataFrame(intersection_list)
def get_topic_word_distance_sum(self, no_words=30):
self.word_distance_dict = {}
if not isinstance(self.word_topic_df, pd.DataFrame):
self.evaluate_model(no_words=no_words)
elif isinstance(
self.word_topic_df,
pd.DataFrame) and self.word_topic_df.shape[1] != no_words:
self.evaluate_model(no_words=no_words)
if self.spacy_vocab is None:
self.load_textgain_embs()
for index in self.word_topic_df.index:
topic_distance_sum = 0
missing_count = 0
for word_a, word_b in combinations(
self.word_topic_df[self.word_topic_df.index ==
index].values[0], 2):
if self.spacy_vocab.has_vector(
str(word_a)) and self.spacy_vocab.has_vector(
str(word_b)):
topic_distance_sum += np.linalg.norm(
self.spacy_vocab.get_vector(str(word_a)) -
self.spacy_vocab.get_vector(str(word_b)))
else:
missing_count += 1
self.word_distance_dict[index] = topic_distance_sum / (
(factorial(no_words) /
(factorial(2) * factorial(no_words - 2))) - missing_count)
self.word_topic_distance_sum = sum(
self.word_distance_dict.values()) / len(
self.word_distance_dict.keys())
# todo: sum of distance between words in topic derived from word embedding
# todo: sum of sum of distances divided by no topics
def load_textgain_embs(self,
from_txt=False,
path="textgain_embeddings/spacy_vocab"):
self.spacy_vocab = Vocab()
if from_txt:
with open(path) as f:
for line in f:
split_line = line.split()
self.spacy_vocab.set_vector(
"".join(split_line[:-150]),
np.array([float(coord)
for coord in split_line[-150:]]))
else:
self.spacy_vocab.from_disk(path)
def calculate_coherence(self, type="cosine"):
pass
#todo: add coherence function here
def calculate_jaccard(self):
pass
#todo: calculate jaccard distance here
def calculate_cosine(self, word_1, word_2):
return np.dot(
word_1, word_2) / (np.linalg.norm(word_1) * np.linalg.norm(word_2))
def calculate_dice(self):
pass
#todo: calculate dice coefficient here
def calculate_centroid_sim(self):
pass
#todo: calculate centroid similarity here
def calculate_word_probs(self):
#todo: calculate unigram and probability of words
self.unigram_dict = defaultdict(int)
self.bigram_dict = defaultdict(int)
unigram_count = 0
bigram_count = 0
for doc in tqdm(self.processed_docs,
desc="calculation uni- and bigram probabilities: "):
for i, word in enumerate(doc):
self.unigram_dict[word] += 1
unigram_count += 1
try:
self.bigram_dict[" ".join([word, doc[i + 1]])] += 1
bigram_count += 1
except:
pass
self.unigram_dict = {
k: v / unigram_count
for k, v in self.unigram_dict.items()
}
self.bigram_dict = {
k: v / bigram_count
for k, v in self.bigram_dict.items()
}
def calculate_pmi(self, word_1, word_2):
if self.unigram_dict is None or self.bigram_dict is None:
self.calculate_word_probs()
return np.log2(self.bigram_dict[" ".join([word_1, word_2])] /
(self.unigram_dict[word_1] * self.unigram_dict[word_2]))
def calculate_npmi(self, word_1, word_2):
return self.calculate_pmi(word_1, word_2) / (
-np.log(self.bigram_dict[" ".join([word_1, word_2])]))
def get_weight_vectors(self, weight=2, type="npmi"):
pass
