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Merge pull request #257 from SciML/ChrisRackauckas-patch-1
Use new SciMLBase docstring for the `solve` documentation
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docs/src/API/solve.md

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# Common Solver Options
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# Common Solver Options (Solve Keyword Arguments)
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In GalacticOptim.jl, solving an `OptimizationProblem` is done via:
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```julia
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solve(prob,alg;kwargs...)
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```
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The arguments to `solve` are common across all of the optimizers.
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These common arguments are:
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- `maxiters` (the maximum number of iterations)
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- `maxtime` (the maximum of time the optimization runs for)
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- `abstol` (absolute tolerance in changes of the objective value)
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- `reltol` (relative tolerance in changes of the objective value)
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- `callback` (a callback function)
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If the chosen global optimzer employs a local optimization method a similiar set of common local optimizer arguments exists.
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The common local optimizer arguments are:
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- `local_method` (optimiser used for local optimization in global method)
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- `local_maxiters` (the maximum number of iterations)
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- `local_maxtime` (the maximum of time the optimization runs for)
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- `local_abstol` (absolute tolerance in changes of the objective value)
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- `local_reltol` (relative tolerance in changes of the objective value)
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- `local_options` (NamedTuple of keyword arguments for local optimizer)
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Some optimizer algorithms have special keyword arguments documented in the
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solver portion of the documentation and their respective documentation.
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These arguments can be passed as `kwargs...` to `solve`. Similiarly, the special
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kewyword arguments for the `local_method` of a global optimizer are passed as a
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`NamedTuple` to `local_options`.
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Over time we hope to cover more of these keyword arguments under the common interface.
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If a common argument is not implemented for a optimizer a warning will be shown.
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## Callback Functions
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The callback function `callback` is a function which is called after every optimizer
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step. Its signature is:
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```julia
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callback = (x,other_args) -> false
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```@docs
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solve(::OptimizationProblem,::Any)
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```
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where `other_args` is are the extra return arguments of the optimization `f`.
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For example, if `f(x,p) = 5x`, then `callback = (x) -> ...` is used. If `f(x,p) = 5x,55x`,
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then ` = (x,extra) -> ...` is used, where `extra = 55x`. This allows for saving
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values from the optimization and using them for plotting and display without
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recalculating. The callback should return a Boolean value, and the default
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should be `false`, such that the optimization gets stopped if it returns `true`.

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