I am guessing probably because most learning models depend on machine learning, and the data is not there to predict rare events. A classic caution for any AI work ...
Even the Best AI Models Are No Match for the Coronavirus in Wired
Many so-called “quantitative funds” that mine historical data to make trading decisions fared poorly in March, when stocks fell sharply amid coronavirus fears.
THE STOCK MARKET appears strangely indifferent to Covid-19 these days, but that wasn’t true in March, as the scale and breadth of the crisis hit home. By one measure, it was the most volatile month in stock market history; on March 16, the Dow Jones average fell almost 13 percent, its biggest one-day decline since 1987. .... "
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