CumSum performs cumulative summation of the input elements along the given axis.
Details:
By default, it will do the sum inclusively meaning the first element is
copied as is. Through an "exclusive" attribute, this behavior can change
to exclude the first element. It can also perform summation in the
opposite direction of the axis. For that, set "reverse" attribute to
true.
JIRA: 29994
Egor Churaev
31fe146539