fastapi openai==0.27.0 python-dotenv pydantic==2.7.4 langchain==0.3.18 bs4 tiktoken nltk scikit-learn transformers tf-keras accelerate textacy https://github.com/explosion/spacy-models/releases/download/es_core_news_sm-3.7.0/es_core_news_sm-3.7.0.tar.gz