NLTK would include state-of-art openly and &quot;nicely&quot; license implementation soon: <a href="https:&#x2F;&#x2F;github.com&#x2F;nltk&#x2F;nltk&#x2F;issues&#x2F;1110" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;nltk&#x2F;nltk&#x2F;issues&#x2F;1110</a>