Visible to Intel only — GUID: GUID-1729F7E4-63EC-48E7-901E-50E008263292
Visible to Intel only — GUID: GUID-1729F7E4-63EC-48E7-901E-50E008263292
copy_batch
Computes a group of copy operations.
Description
The copy_batch routines are batched versions of copy, performing multiple copy operations in a single call. Each copy operation copies one vector to another.
copy_batch supports the following precisions:
T |
---|
float |
double |
std::complex<float> |
std::complex<double> |
copy_batch (Buffer Version)
Buffer version of copy_batch supports only strided API.
Strided API
Strided API operation is defined as:
for i = 0 … batch_size – 1 X and Y are vectors at offset i * stridex and i * stridey in x and y Y = X end for
where:
X and Y are vectors
For strided API, all vectors x (y) have same parameters (size, increments) and are stored at constant stridex (stridey) from each other. The x and y arrays contain all the input vectors. Total number of vectors in x and y are given by batch_size parameter.
Syntax
namespace oneapi::mkl::blas::column_major { void copy_batch(sycl::queue &queue, std::int64_t n, sycl::buffer<T, 1> &x, std::int64_t incx, std::int64_t stridex, sycl::buffer<T, 1> &y, std::int64_t incy, std::int64_t stridey, std::int64_t batch_size) }
namespace oneapi::mkl::blas::row_major { void copy_batch(sycl::queue &queue, std::int64_t n, sycl::buffer<T, 1> &x, std::int64_t incx, std::int64_t stridex, sycl::buffer<T, 1> &y, std::int64_t incy, std::int64_t stridey, std::int64_t batch_size) }
Input Parameters
- queue
-
The queue where the routine should be executed.
- n
-
Number of elements in vectors X and Y.
- x
-
Buffer holding input vectors X. Size of the buffer must be at least batch_size * stridex.
- incx
-
Stride between two consecutive elements of X vectors. Must not be zero.
- stridex
-
Stride between two consecutive X vectors. Must be at least zero.
- y
-
Buffer holding input/output vectors Y. Size of the buffer must be at least batch_size * stridey.
- incy
-
Stride between two consecutive elements of Y vectors. Must not be zero.
- stridey
-
Stride between two consecutive Y vectors. Must be at least (1 + (n-1)*abs(incy)). See Matrix Storage for more details.
- batch_size
-
Number of copy computations to perform. Must be at least zero.
Output Parameters
- y
-
Output buffer overwritten by batch_sizecopy operations.
copy_batch (USM Version)
USM version of copy_batch supports group API and strided API.
Group API
Group API operation is defined as:
idx = 0 for i = 0 … group_count – 1 for j = 0 … group_size – 1 X and Y are vectors at x[idx] and y[idx] Y = X idx = idx + 1 end for end for
where:
X and Y are vectors
For group API, each group contains vectors with the same parameters (size and increment). The x and y arrays contain the pointers for all the input vectors. Total number of vectors in x and y are given by:
Syntax
namespace oneapi::mkl::blas::column_major { sycl::event copy_batch(sycl::queue &queue, const std::int64_t *n, const T **x, const std::int64_t *incx, T **y, const std::int64_t *incy, std::int64_t group_count, const std::int64_t *group_size, const std::vector<sycl::event> &dependencies = {}) }
namespace oneapi::mkl::blas::row_major { sycl::event copy_batch(sycl::queue &queue, const std::int64_t *n, const T **x, const std::int64_t *incx, T **y, const std::int64_t *incy, std::int64_t group_count, const std::int64_t *group_size, const std::vector<sycl::event> &dependencies = {}) }
Input Parameters
- queue
-
The queue where the routine should be executed.
- n
-
Array of group_count integers. n[i] specifies number of elements in vectors X and Y for every vector in group i.
- x
-
Array of pointers to input vectors X with size total_batch_count. Size of the array allocated for the X vector of the group i must be at least (1 + (n[i] – 1)*abs(incx[i])). See Matrix Storage for more details.
- incx
-
Array of group_count integers. incx[i] specifies stride of vector X in group i. Must not be zero.
- y
-
Array of pointers to input/output vectors Y with size total_batch_count. Size of the array allocated for the Y vector of the group i must be at least (1 + (n[i] – 1)*abs(incy[i])). See Matrix Storage for more details.
- incy
-
Array of group_count integers. incy[i] specifies the stride of vector Y in group i. Must not be zero.
- group_count
-
Number of groups. Must be at least zero.
- group_size
-
Array of group_count integers. group_size[i] specifies the number of copy operations in group i. Each element in group_size must be at least zero.
- dependencies
-
List of events to wait for before starting computation, if any. If omitted, defaults to no dependencies.
Output Parameters
- y
-
Array of pointers holding Y vectors, overwritten by total_batch_countcopy operations.
Return Values
Output event to wait on to ensure computation is complete.
Examples
An example of how to use USM version of copy_batch can be found in oneMKL installation directory, under:
examples/dpcpp/blas/source/copy_batch_usm.cpp
Strided API
Strided API operation is defined as:
for i = 0 … batch_size – 1 X and Y are vectors at offset i * stridex and i * stridey in x and y Y = X end for
where:
X and Y are vectors
For strided API, all vectors x (y) have same parameters (size, increments) and are stored at constant stridex (stridey) from each other. The x and y arrays contain all the input vectors. Total number of vectors in x and y are given by batch_size parameter.
Syntax
namespace oneapi::mkl::blas::column_major { sycl::event copy_batch(sycl::queue &queue, std::int64_t n, const T *x, std::int64_t incx, std::int64_t stridex, T *y, std::int64_t incy, std::int64_t stridey, std::int64_t batch_size, const std::vector<sycl::event> &dependencies = {}) }
namespace oneapi::mkl::blas::row_major { sycl::event copy_batch(sycl::queue &queue, std::int64_t n, const T *x, std::int64_t incx, std::int64_t stridex, T *y, std::int64_t incy, std::int64_t stridey, std::int64_t batch_size, const std::vector<sycl::event> &dependencies = {}) }
Input Parameters
- queue
-
The queue where the routine should be executed.
- n
-
Number of elements in vectors X and Y.
- x
-
Pointer to input vectors X. Size of the array must be at least batch_size * stridex.
- incx
-
Stride between two consecutive elements of X vectors. Must not be zero.
- stridex
-
Stride between two consecutive X vectors. Must be at least zero.
- y
-
Pointer to input/output vectors Y. Size of the array must be at least batch_size * stridey.
- incy
-
Stride between two consecutive elements of Y vectors. Must not be zero.
- stridey
-
Stride between two consecutive Y vectors. Must be at least (1 + (n-1)*abs(incy)). See Matrix Storage for more details.
- batch_size
-
Number of copy computations to perform. Must be at least zero.
- dependencies
-
List of events to wait for before starting computation, if any. If omitted, defaults to no dependencies.
Output Parameters
- y
-
Output vectors overwritten by batch_sizecopy operations.
Return Values
Output event to wait on to ensure computation is complete.