[SciPy-User] fast small matrix multiplication with cython?

[josef.pktd at gmail.com]

>
> It looks like I don't save too much time with just Python/scipy
> optimizations.  Apparently ~75% of the time is spent in l-bfgs-b,
> judging by its user time output and the profiler's CPU time output(?).
>  Non-cython versions:
>
> Brief and rough profiling on my laptop for ARMA(2,2) with 1000
> observations.  Optimization uses fmin_l_bfgs_b with m = 12 and iprint
> = 0.

Completely different idea: How costly are the numerical derivatives in l-bfgs-b?
With l-bfgs-b, you should be able to replace the derivatives with the
complex step derivatives that calculate the loglike function value and
the derivatives in one iteration.

Josef