hipBLAS

hipBLAS is a Basic Linear Algebra Subprograms (BLAS) marshalling library with multiple supported backends. It sits between your application and a 'worker' BLAS library, where it marshals inputs to the backend library and marshals results to your application. hipBLAS exports an interface that doesn't require the client to change, regardless of the chosen backend. Currently, hipBLAS supports rocBLAS and cuBLAS backends.

To use hipBLAS, you must first install rocBLAS, rocSPARSE, and rocSOLVER or cuBLAS.

Documentation

[!NOTE] The published hipBLAS documentation is available at hipBLAS in an organized, easy-to-read format, with search and a table of contents. The documentation source files reside in the hipBLAS/docs folder of this repository. As with all ROCm projects, the documentation is open source. For more information, see Contribute to ROCm documentation.

To build our documentation locally, use the following code:

cd docs

pip3 install -r sphinx/requirements.txt

python3 -m sphinx -T -E -b html -d _build/doctrees -D language=en . _build/html

Alternatively, build with CMake:

cmake -DBUILD_DOCS=ON ...

Build and install

Download the hipBLAS source code (clone this repository):

    git clone https://github.com/ROCmSoftwarePlatform/hipBLAS.git

    hipBLAS requires specific versions of rocBLAS and rocSOLVER. Refer to
    [CMakeLists.txt](https://github.com/ROCmSoftwarePlatform/hipBLAS/blob/develop/library/CMakeLists.txt)
    for details.

Build hipBLAS and install it into /opt/rocm/hipblas:
```
    cd hipblas
    ./install.sh -i
```

Interface examples

The hipBLAS interface is compatible with rocBLAS and cuBLAS-v2 APIs. Porting a CUDA application that originally calls the cuBLAS API to an application that calls the hipBLAS API is relatively straightforward. For example, the hipBLAS SGEMV interface is:

GEMV API

hipblasStatus_t
hipblasSgemv( hipblasHandle_t handle,
              hipblasOperation_t trans,
              int m, int n, const float *alpha,
              const float *A, int lda,
              const float *x, int incx, const float *beta,
              float *y, int incy );

Batched and strided GEMM API

hipBLAS GEMM can process matrices in batches with regular strides by using the strided-batched version of the API:

hipblasStatus_t
hipblasSgemmStridedBatched( hipblasHandle_t handle,
              hipblasOperation_t transa, hipblasOperation_t transb,
              int m, int n, int k, const float *alpha,
              const float *A, int lda, long long bsa,
              const float *B, int ldb, long long bsb, const float *beta,
              float *C, int ldc, long long bsc,
              int batchCount);

hipBLAS assumes matrix A and vectors x, y are allocated in GPU memory space filled with data. You are responsible for copying data to and from the host and device memory.