OasisLMF Package

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Introduction

The oasislmf Python package, loosely called the model development kit (MDK) or the MDK package, provides a command line toolkit for developing, testing and running Oasis models end-to-end locally, or remotely via the Oasis API. It can generate ground-up losses (GUL), direct/insured losses (IL) and reinsurance losses (RIL). It can also generate deterministic losses at all these levels.


Features

For running models locally the CLI provides a model subcommand with the following options:

  • model generate-exposure-pre-analysis: generate new Exposure input using user custom code (ex: geo-coding, exposure enhancement, or disaggregation…).

  • model generate-keys: generates Oasis keys files from model lookups; these are essentially line items of (location ID, peril ID, coverage type ID, area peril ID, vulnerability ID) where peril ID and coverage type ID span the full set of perils and coverage types that the model supports; if the lookup is for a complex/custom model the keys file will have the same format except that area peril ID and vulnerability ID are replaced by a model data JSON string.

  • model generate-oasis-files: generates the Oasis input CSV files for losses (GUL, GUL + IL, or GUL + IL + RIL); it requires the provision of source exposure and optionally source accounts and reinsurance info and scope files (in OED format), as well as assets for instantiating model lookups and generating keys files.

  • model generate-losses: generates losses (GUL, or GUL + IL, or GUL + IL + RIL) from a set of pre-existing Oasis files.

  • model run: runs the model from start to finish by generating losses (GUL, or GUL + IL, or GUL + IL + RIL) from the source exposure, and optionally source accounts and reinsurance info. and scope files (in OED or RMS format), as well as assets related to lookup instantiation and keys file generation.


The optional --summarise-exposure flag can be issued with model generate-oasis-files and model run to generate a summary of Total Insured Values (TIVs) grouped by coverage type and peril. This produces the exposure_summary_report.json file.

For remote model execution the api subcommand provides the following main subcommand:

  • api run: runs the model remotely (same as model run) but via the Oasis API

For generating deterministic losses an exposure run subcommand is available:

  • exposure run: generates deterministic losses (GUL, or GUL + IL, or GUL + IL + RIL)


The reusable libraries are organised into several sub-packages, the most relevant of which from a model developer or user’s perspective are:

  • api_client

  • model_preparation

  • model_execution

  • utils


Minimum Python Requirements

Starting from 1st January 2019, Pandas will no longer be supporting Python 2. As Pandas is a key dependency of the MDK we are dropping Python 2 (2.7) support as of this release (1.3.4). The last version which still supports Python 2.7 is version 1.3.3 (published 12/03/2019).

Also for this release (and all future releases) a minimum of Python 3.8 is required.


Installation

The latest released version of the package, or a specific package version, can be installed using pip:

pip install oasislmf[==<version string>]

Alternatively you can install the latest development version using:

pip install git+{https,ssh}://git@github.com/OasisLMF/OasisLMF

You can also install from a specific branch <branch name> using:

pip install [-v] git+{https,ssh}://git@github.com/OasisLMF/OasisLMF.git@<branch name>#egg=oasislmf

Enable Bash completion

Bash completion is a functionality which bash helps users type their commands by presenting possible options when users press the tab key while typing a command.

Once oasislmf is installed you’ll need to be activate the feature by sourcing a bash file (only needs to be run once).


Local

oasislmf admin enable-bash-complete

Global

echo 'complete -C completer_oasislmf oasislmf' | sudo tee /usr/share/bash-completion/completions/oasislmf

Dependencies

System

The package provides a built-in lookup framework (oasislmf.model_preparation.lookup.OasisLookup) which uses the Rtree Python package, which in turn requires the libspatialindex spatial indexing C library.

https://libspatialindex.github.io/index.html


Linux users can install the development version of libspatialindex from the command line using apt.

[sudo] apt install -y libspatialindex-dev

and OS X users can do the same via brew.

brew install spatialindex

The PiWind demonstration model uses the built-in lookup framework, therefore running PiWind or any model which uses the built-in lookup, requires that you install libspatialindex.


GNU/Linux

For GNU/Linux the following is a specific list of required system libraries

  • Debian: g++ compiler build-essential, libtool, zlib1g-dev autoconf on debian distros

sudo apt install g++ build-essential libtool zlib1g-dev autoconf

  • Red Hat: ‘Development Tools’ and zlib-devel


Python

Package Python dependencies are controlled by pip-tools. To install the development dependencies first, install pip-tools using:

pip install pip-tools

and run:

pip-sync

To add new dependencies to the development requirements add the package name to requirements.in or to add a new dependency to the installed package add the package name to requirements-package.in. Version specifiers can be supplied to the packages but these should be kept as loose as possible so thatall packages can be easily updated and there will be fewer conflict when installing.


After adding packages to either *.in file:

pip-compile && pip-sync

This should be ran ensuring the development dependencies are kept up to date.


ods_tools

OasisLMF uses the ods_tools package to read exposure files and the setting files. The version compatible with each OasisLMF is manage in the requirement files. Below is the summary:

  • OasisLMF 1.23.x or before => no ods_tools

  • OasisLMF 1.26.x => use ods_tools 2.3.2

  • OasisLMF 1.27.0 => use ods_tools 3.0.0 or later

  • OasisLMF 1.27.1 => use ods_tools 3.0.0 or later

  • OasisLMF 1.27.2 => use ods_tools 3.0.4 or later


pandas

Pandas has released its major version number 2 breaking some of the compatibility with the 1st version. Therefore, for all version of OasisLMF <= 1.27.2, the latest supported version for pandas is 1.5.3. Support for pandas 2, starts from version 1.27.3.


Testing

To test the code style run:

flake8

To test against all supported python versions run:

tox

To test against your currently installed version of python run:

py.test

To run the full test suite run:

./runtests.sh

Publishing

Before publishing the latest version of the package make you sure increment the __version__ value in oasislmf/__init__.py, and commit the change. You’ll also need to install the twine Python package which setuptools uses for publishing packages on PyPI. If publishing wheels then you’ll also need to install the wheel Python package.


Using the publish subcommand in setup.py

The distribution format can be either a source distribution or a platform-specific wheel. To publish the source distribution package run:

python setup.py publish --sdist

Or to publish the platform specific wheel run:

python setup.py publish --wheel

Creating a bdist for another platform

To create a distribution for a non-host platform use the --plat-name flag:

python setup.py bdist_wheel --plat-name Linux_x86_64

or

python setup.py bdist_wheel --plat-name Darwin_x86_64

Manually publishing, with a GPG signature

The first step is to create the distribution package with the desired format:

For the source distribution run:

python setup.py sdist

Which will create a .tar.gz file in the dist subfolder, or for the platform specific wheel run:

python setup.py bdist_wheel

Which will create .whl file in the dist subfolder. To attach a GPG signature using your default private key you can then run:

gpg --detach-sign -a dist/<package file name>.{tar.gz,whl}

This will create .asc signature file named <package file name>.{tar.gz,whl}.asc in dist. You can just publish the package with the signature using:

twine upload dist/<package file name>.{tar.gz,whl} dist/<package file name>.{tar.gz,whl}.asc