Update Dockerfile

Dockerfile

@@ -13,7 +13,7 @@ RUN apt-get update && apt-get install -y \
 
 RUN pip install --no-cache-dir -r requirements.txt
 
-RUN python -c "import nltk; nltk.download('punkt'); nltk.download('stopwords'); nltk.download('averaged_perceptron_tagger')"
+RUN python -c "import nltk; nltk.data.path.append('/app/nltk_data'); nltk.download('punkt', download_dir='/app/nltk_data'); nltk.download('stopwords', download_dir='/app/nltk_data'); nltk.download('averaged_perceptron_tagger', download_dir='/app/nltk_data')"
 
 EXPOSE 7860