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README.md

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Description

Basic Tensor Algebra Subroutines (BTAS) is a C++ library for tensor algebra. BTAS is a reference implementation of Tensor Working Group concept spec. The library can be optionally used header-only at the cost of much lower performance for most operations.

Prerequisites

  • C++17 compiler
  • CMake
  • Boost C++ libraries
    • Iterator
    • (optional, but recommended) Container for fast small vectors
    • (optional) Serialization for serialization (non-header-only)
  • (used by default, strongly recommended, but can be disabled) BLAS+LAPACK libraries and their BLAS++/LAPACK++ C++ APIs for optimized operations (non-header-only)

Building and Installing

TL;DR version

  • cmake .
  • make check

useful CMake variables

  • CMAKE_CXX_COMPILER -- specifies the C++ compiler (by default CMake will look for the C++ compiler in PATH)
  • BTAS_USE_BLAS_LAPACK -- specifies whether to enable the use of BLAS/LAPACK via the BLAS++/LAPACK++ APIs; the default is ON
  • BTAS_BUILD_DEPS_FROM_SOURCE -- specifies whether to enable building the missing dependencies (Boost) from source; the default is OFF
  • BUILD_TESTING -- specifies whether to build unit tests; the default is ON
  • TARGET_MAX_INDEX_RANK -- specifies the rank for which the default BTAS index type will use stack; the default is 6