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       get_num_groups - Returns the number of work-groups that will execute a kernel.

       size_t get_num_groups(uint dimindx);


       Returns the number of work-groups that will execute a kernel for dimension identified by
       dimindx. Valid values of dimindx are 0 to get_work_dim(3clc)() - 1. For other values of
       dimindx, get_num_groups() returns 1.

       For clEnqueueTask(3clc), this always returns 1.


       OpenCL Specification[1]


       workItemFunctions(3clc), clEnqueueNDRangeKernel(3clc), clEnqueueTask(3clc)


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        1. OpenCL Specification
           page 242, section 6.12.1 - Work-Item Functions