Cannot use this for japanese text

[MARUD84]

Dear Tim Schopf, Thank you for your effort in creating this library. It has been really useful for extracting key phrases for English, German and Chinese text, but i am having trouble applying it to Japanese text.
As suggested i have changed the spacy_pipeline to ja_core_news_sm and have a list of Japanese stop words, but i am getting the following error:
ValueError: Empty keyphrases. Perhaps the documents do not contain keyphrases that match the 'pos_pattern' parameter or only contain stop words.
Do you happen to know why this might be?

[leegunwoo98]

I discovered that on line 427, on keyphrase_vectorizer_mixin.py
pos_tuples.extend([(word.text, word.tag_) for word in tagged_doc if word.text])

the fine_grained tag (word.tag_) is in japanese. As a result, the universal tag (NOUN, VERB style) is in word.pos_