from nltk.sentiment.vader import SentimentIntensityAnalyzer

def init_nltk():
    print("\nLoading NLTK....")
    try :
        sid = SentimentIntensityAnalyzer()
    except LookupError:
        print("Please install SentimentAnalyzer using : nltk.download('vader_lexicon')")
    print("NLTK successfully loaded")
    return(sid)