ptmcmcsampler 2.1.1

Parallel tempering MCMC sampler written in Python

PTMCMCSampler

MPI enabled Parallel Tempering MCMC code written in Python.

See the examples for some simple use cases.

For MPI support you will need A functional MPI 1.x/2.x/3.x implementation like:

• MPICH

  # mac
  brew install mpich
  
  # debian
  sudo apt install mpich
  

• Open MPI

  # mac
  brew install open-mpi
  
  # debian
  sudo apt install libopenmpi-dev
  

To run with MPI support you can run your script containing a sampler with:

mpirun -np <number of temperature chains> script.py

This will kick off np chains running at different temperatures. The temperature ladder and sampling schemes can be set in the PTMCMCSampler.sample() method.

Installation

Development

For development clone this repo and run:

make init
source venv/bin/activate

Via pip

pip install ptmcmcsampler

for MPI support use

pip install ptmcmcsampler[mpi]

Via conda

conda install -c conda-forge ptmcmcsampler

for MPI support use

conda install -c conda-forge ptmcmcsampler mpi4py

Attribution

If you make use of this code, please cite:

@misc{justin_ellis_2017_1037579,
  author       = {Justin Ellis and
                  Rutger van Haasteren},
  title        = {jellis18/PTMCMCSampler: Official Release},
  month        = oct,
  year         = 2017,
  doi          = {10.5281/zenodo.1037579},
  url          = {https://doi.org/10.5281/zenodo.1037579}
}

Correlation Length

In order for the sampler to run correctly using acor with Python 3 kernels the GitHub version of acor needs to be installed. (Currently the PyPI version is behind the GitHub version.) It can be easily installed with:

pip install git+https://github.com/dfm/acor.git@master

Note that acor is not required to run the sampler, it simply calculates the effective chain length for output in the chain file.

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