This crate is used internally by Tinychain to provide the Tensor data structure. You can enable it using the tensor feature (e.g. cargo build --release --features=tensor). It requires linking to ArrayFire version 3.8 in order to compile. You can download and install ArrayFire by following the instructions at http://arrayfire.org/docs/installing.htm. You'll also have to add a package config file to your $PKG_CONFIG_PATH like so:
prefix=/usr
exec_prefix=${prefix}
includedir=${prefix}/include
libdir=${exec_prefix}/lib64
Name: arrayfire
Description: the ArrayFire library
Version: 3.8
Libs: -L${libdir}
For more information on Tinychain, see http://github.com/haydnv/tinychain