powr

oneMKL - Data Parallel C++ Developer Reference

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ID 772045

Date 7/13/2023

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powr

Computes the element-wise exponentiation of vector a elements raised to the power of vector b elements, where the elements of vector a are all non-negative.

Description
API
Examples

Description

The powr(a,b) function raises each element of vector a by the corresponding element of vector b. The elements of a are all nonnegative (a_i≥ 0).

Data Type	Threshold Limitations on Input Parameters
single precision	`a`_i < (FLT_MAX)^1/``b`i`
double precision	`a`_i < (DBL_MAX)^1/``b`i`

Special values and VM Error Status treatment for v?Powr function are the same as for pow, unless otherwise indicated in this table:

Argument 1	Argument 2	Result	Error Code
`a` < 0	any value `b`	NAN	`status::errdom`
0 < `a` <	±0	1
±0	- < `b` < 0	+
±0	-	+
±0	`b` > 0	+0
1	- < `b` <	1
±0	±0	NAN
+	±0	NAN
1	+	NAN
`a`≥ 0	NAN	NAN
NAN	any value `b`	NAN
0 < `a` <1	-	+
`a` > 1	-	+0
0 ≤`a` < 1	+	+0
`a` > 1	+	+
+	`b` < +0	+0
+	`b` > +0	+
QNAN	QNAN	QNAN	`status::errdom`
QNAN	SNAN	QNAN	`status::errdom`
SNAN	QNAN	QNAN	`status::errdom`
SNAN	SNAN	QNAN	`status::errdom`

API

Syntax

Buffer API

namespace oneapi::mkl::vm {

sycl::event powr(sycl::queue & exec_queue,
      std::int64_t n,
      sycl::buffer<T> & a,
      sycl::buffer<T> & b,
      sycl::buffer<T> & y,
      oneapi::mkl::vm::mode mode = oneapi::mkl::vm::mode::not_defined,
      oneapi::mkl::vm::error_handler<T> errhandler = {});

}

namespace oneapi::mkl::vm {

sycl::event powr(sycl::queue & exec_queue,
      sycl::buffer<T> & a,
      oneapi::mkl::slice sa,
      sycl::buffer<T> & b,
      oneapi::mkl::slice sb,
      sycl::buffer<T> & y,
      oneapi::mkl::slice sy,
      oneapi::mkl::vm::mode mode = oneapi::mkl::vm::mode::not_defined,
      oneapi::mkl::vm::error_handler<T> errhandler = {});

}

USM API

namespace oneapi::mkl::vm {

sycl::event powr(sycl::queue & exec_queue,
      std::int64_t n,
      T const * a,
      T const * b,
      T * y,
      std::vector<sycl::event> const & depends = {},
      oneapi::mkl::vm::mode mode = oneapi::mkl::vm::mode::not_defined,
      oneapi::mkl::vm::error_handler<T> errhandler = {});

}

namespace oneapi::mkl::vm {

sycl::event powr(sycl::queue & exec_queue,
      T const * a,
      oneapi::mkl::slice sa,
      T const * b,
      oneapi::mkl::slice sb,
      T * y,
      oneapi::mkl::slice sy,
      std::vector<sycl::event> const & depends = {},
      oneapi::mkl::vm::mode mode = oneapi::mkl::vm::mode::not_defined,
      oneapi::mkl::vm::error_handler<T> errhandler = {});

}

powr supports the following precisions and devices:

T	Devices supported
`float`	CPU and GPU
`double`	CPU and GPU

Input Parameters

Buffer API

exec_queue: The queue where the routine should be executed.
n: Specifies the number of elements to be calculated.
a: The buffer containing the 1st input vector.
sa: Slice selector for a. See Data Types for a description of the oneMKL slice type.
b: The buffer containing the 2nd input vector.
sb: Slice selector for b. See Data Types for a description of the oneMKL slice type.
sy: Slice selector for y. See Data Types for a description of the oneMKL slice type.
mode: Overrides the global VM mode setting for this function call. See set_mode function for possible values and their description. This is an optional parameter. The default value is mode::not_defined.
errhandler: Sets local error handling mode for this function call. See the create_error_handler function for arguments and their descriptions. This is an optional parameter. The local error handler is disabled by default.

USM API

exec_queue: The queue where the routine should be executed.
n: Specifies the number of elements to be calculated.
a: Pointer to the 1st input vector.
sa: Slice selector for a. See Data Types for a description of the oneMKL slice type.
b: Pointer to the 2nd input vector.
sb: Slice selector for b. See Data Types for a description of the oneMKL slice type.
sy: Slice selector for y. See Data Types for a description of the oneMKL slice type.
depends: Vector of dependent events (to wait for input data to be ready). This is an optional parameter. The default is an empty vector.
mode: Overrides the global VM mode setting for this function call. See the set_mode function for possible values and their description. This is an optional parameter. The default value is mode::not_defined.
errhandler: Sets local error handling mode for this function call. See the create_error_handler function for arguments and their descriptions. This is an optional parameter. The local error handler is disabled by default.

Output Parameters

Buffer API

y: The buffer containing the output vector.
return value (event): Computation end event.

USM API

y: Pointer to the output vector.
return value (event): Computation end event.

Examples

An example of how to use powr can be found in the oneMKL installation directory, under:

examples/dpcpp/vml/source/vpowr.cpp

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oneMKL - Data Parallel C++ Developer Reference

powr

Description

API

Examples