Data Scientist BNSP NLP natural language processing analisis sentimen text analytics sentiment analysis social media monitoring opinion mining chatbot language model Indonesian NLP text preprocessing tokenization lemmatization stopword TF-IDF word embedding BERT transformer text classification topic modeling LDA named entity recognition NER text summarization document classification customer feedback brand monitoring crisis detection public opinion political sentiment media analysis corporate communication digital listening text to speech speech to text voice analytics multilingual NLP low-resource language Bahasa Indonesia fine-tuning NLP transformer model deep learning NLP intent detection emotion detection