It's not parsing the phrase into the tokens "10 - 2" and evaluating that. Rather, a corpus of data was used to train the neural net and, for whatever reason, th

It's not parsing the phrase into the tokens "10 - 2" and evaluating that. Rather, a corpus of data was used to train the neural net and, for whatever reason, the answer "seventy-two" was the highest probability output. In all likelihood, it doesn't even register that this is a math question.