[SciPy-dev] New coding style (docstrings) : question
Mon Aug 6 12:23:14 CDT 2007
On 06/08/07, dmitrey <firstname.lastname@example.org> wrote:
> Especially I'm interested in func handlers - are they need any type
I don't know if there's any formal standard for how they're written,
but it definitely helps to be as specific as possible about what
callback functions get passed and must return.
> func -- the Python function or method to be minimized.
> x0 : ndarray -- the initial guess.
> args -- extra arguments for func.
> callback -- an optional user-supplied function to call after each
> iteration. It is called as callback(xk), where xk is the
> current parameter vector.
Specifically, what does fopt get passed? the x value, as a
one-dimensional array, and args? Is it called as f(x,args) or
f(x,*args)? It's also worth mentioning that it should return a scalar,
the function value there. Similarly for the callback, which should
presumably return None. I take it that callback can throw exceptions
to abort the optimization if necessary (that is, this won't leave the
optimizer's internal state in a mess)?
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