OpenCV
4.0.0
Open Source Computer Vision
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Compilation arguments: a set of data structures which can be passed to control compilation process. More...
Classes | |
struct | cv::GCompileArg |
Represents an arbitrary compilation argument. More... | |
class | cv::gapi::GKernelPackage |
A container class for heterogeneous kernel implementation collections. More... | |
struct | cv::graph_dump_path |
Ask G-API to dump compiled graph in Graphviz format under the given file name. More... | |
Typedefs | |
using | cv::GCompileArgs = std::vector< GCompileArg > |
using | cv::gapi::GLookupOrder = std::vector< GBackend > |
Priority list of backends to use during kernel resolution process. More... | |
Functions | |
template<typename... Ts> | |
GCompileArgs | cv::compile_args (Ts &&... args) |
template<typename... KK> | |
GKernelPackage | cv::gapi::kernels () |
Create a kernel package object containing kernels specified in variadic template argument. More... | |
GLookupOrder | cv::gapi::lookup_order (std::initializer_list< GBackend > &&list) |
Create a backend lookup order – priority list of backends to use during graph compilation process. More... | |
Compilation arguments: a set of data structures which can be passed to control compilation process.
G-API comes with a number of graph compilation options which can be passed to cv::GComputation::apply() or cv::GComputation::compile(). Known compilation options are listed in this page, while extra backends may introduce their own compilation options (G-API transparently accepts everything which can be passed to cv::compile_args(), it depends on underlying backends if an option would be interpreted or not).
For example, if an example computation is executed like this:
Extra parameter specifying which kernels to compile with can be passed like this:
using cv::GCompileArgs = typedef std::vector<GCompileArg> |
using cv::gapi::GLookupOrder = typedef std::vector<GBackend> |
Priority list of backends to use during kernel resolution process.
Priority is descending – the first backend in the list has the top priority, and the last one has the lowest priority.
If there's multiple implementations available for a kernel at the moment of graph compilation, a kernel (and thus a backend) will be selected according to this order (if the parameter is passed).
Default order is not specified (and by default, only CPU(OpenCV) backend is involved in graph compilation).
GCompileArgs cv::compile_args | ( | Ts &&... | args | ) |
Wraps a list of arguments (a parameter pack) into a vector of compilation arguments (cv::GCompileArg).
GKernelPackage cv::gapi::kernels | ( | ) |
Create a kernel package object containing kernels specified in variadic template argument.
In G-API, kernel implementations are types. Every backend has its own kernel API (like GAPI_OCV_KERNEL() and GAPI_FLUID_KERNEL()) but all of that APIs define a new type for each kernel implementation.
Use this function to pass kernel implementations (defined in either way) to the system. Example:
Note that kernels() itself is a function returning object, not a type, so having ()
at the end is important – it must be a function call.
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inline |
Create a backend lookup order – priority list of backends to use during graph compilation process.