I am wondering what method the news sentiment analysis uses. I tried both textblob and nltk python library to make sentiment score for news, but they got totally different results comparing with the index shown on the right of the news in News monitor (that index is relatively correct).
For example the news with storyId 'urn:newsml:reuters.com:20211122:nL1N2SD2VH:3' got both positive scores with textblob and nltk library, however the news page shows it is negative.
So how can I get the same result with that index? Thanks in advance