Installation

The preferred installation method is via pip in the virtual environment of your choice.

Note

nessai requires Python 3.6 or greater.

Installing nessai

PyTorch

nessai requires PyTorch will can be installed using pip or conda. It’s recommend to first install the correct version on PyTorch for your system and then proceed with the usual installation. See the PyTorch homepage for instructions: https://pytorch.org/.

Note

nessai includes GPU support but it is not recommended as for the majority of use-cases the current implementation runs slower on the GPU than CPU. This may change with future optimisations.

Nessai

nessai can be installed using pip

$ pip install nessai

This will install the dependencies needed but the version of PyTorch will not necessarily be the correct version for your system unless you followed the previous step.

Nessai for development

To install nessai for development purposes see the contribution guidelines.

Using nessai with bilby

nessai is included in bilby version 1.1.0 onwards. For instructions on how to install bilby see here.

For examples of how to run nessai via bilby see the examples directory.