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The conda package specification includes the package name (i.e. singa), version and build string (could be very long).
To install a certain SINGA package we run

    conda install -c nusdbsystem singa=<version>=<build string>

It is inconvenient to type all 3 parts when running the installation commands.
The meta.yml file in this folder is to create a conda package `singa-gpu` as
an alias of one specific SINGA package.
It does nothing except creating a dummy conda package that depends on one real
gpu version SINGA package.  For example, the following line in meta.yml indicates
that singa-gpu depends on SINGA with version 1.1.1, python version=3.6, cuda version=9
and cudnn version = 7.1.2

    - singa 1.1.1 py36_cuda9.0_cudnn7.1.2


Therefore, when we run

    conda install -c nusdbsystem singa-gpu

The dependent SINGA package will be installed.
By default, singa-gpu depends on the latest SINGA (py3.6) on the latest cuda (and cudnn).
When we have a new SINGA version available, we need to update the meta.yml file to
change the dependency.

To build this package and upload it

    conda config --add channels nusdbsystem
    conda-build .  --python 3.6
    anaconda -t $ANACONDA_UPLOAD_TOKEN upload -u nusdbsystem -l main <path to the singa-cpu package>

where $ANACONDA_UPLOAD_TOKEN is the upload token associated with nusdbsystem account on anaconda cloud.
