accumulate

[ryanmrichard]

Issue Description

Right now we support tensor operations like C("i,j") = A("i,j") + B("i,j");, but not operations like A("i,j") += B("i,j");. This issue is for adding support for operator+= and operator-=.

[thelechen]

Is this referring to the operation layer only?

[ryanmrichard]

@LChenGit it's referring to making sure these operations work. That certainly includes the expression layer, but you may need to change other objects, like Buffer too.