Extend arithmetic operator support for accumulators #352
Description
All accumulators support addition and scaling (multiplication by a constant). Additionally, we could support subtraction, multiplication, and division.
Subtraction
- count
- sum
- weighted_sum
- mean
- weighted_mean
Multiplication
- count
- sum
- weighted_sum
- mean
- weighted_mean
Division
- count
- sum
- weighted_sum
- mean
- weighted_mean
How to implement division and multiplication for weighted mean is mathematically not clear to me.