flopscope.accounting.matrix_power_cost
flopscope.accounting.matrix_power_cost(n, k)[flopscope source]
Weighted FLOP cost of matrix power A**k.
Parameters
- n:int
Number of columns in the input matrix.
- k:int
Target rank or number of singular components to estimate.
Returns
- :int
Weighted public cost estimate, floored to match runtime accounting.
Notes
This helper multiplies the analytical FLOP count by the active weight from flopscope._weights and then applies int(...) so public estimates match budget deductions.
Uses exponentiation by repeated squaring. For $k < 0$, adds $n^3$ for the initial matrix inversion.