Excellent analysis Iason. I only have 2 comments :

  1. on point 7, with a customised machine learning model 80% sentiment precision is possible. This implies that the human judge of the accuracy will agree with the automatic annotations 8 times out of 10. There are some cases with many ambiguous posts whereby lower than 80% agreement of a certain human with the algorithm may occur, but this is rather the exception than the rule
  2. on point 16, very recently there has been a lot of progress in deep learning and image processing. This type of analysis is already available by a handful of specialised tools

CEO @DigitalMR a tech company in artificial intelligence that has cracked the code of unstructured data.

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