Roman Calibration Pipeline

Roman requires Python 3.6 or above and a C compiler for dependencies.

Linux and MacOS platforms are tested and supported. Windows is not currently supported.

Installation

The easiest way to install the latest roman release into a fresh virtualenv or conda environment is

pip install romancal

Detailed Installation

The romancal package can be installed into a virtualenv or conda environment via pip. We recommend that for each installation you start by creating a fresh environment that only has Python installed and then install the romancal package and its dependencies into that bare environment. If using conda environments, first make sure you have a recent version of Anaconda or Miniconda installed. If desired, you can create multiple environments to allow for switching between different versions of the romancal package (e.g. a released version versus the current development version).

In all cases, the installation is generally a 3-step process:

Create a conda environment
Activate that environment
Install the desired version of the romancal package into that environment

Details are given below on how to do this for different types of installations, including tagged releases, DMS builds used in operations, and development versions. Remember that all conda operations must be done from within a bash shell.

Installing latest releases

You can install the latest released version via pip. From a bash shell:

conda create -n <env_name> python
conda activate <env_name>
pip install romancal

You can also install a specific version (from romancal 0.17.0 onward):

conda create -n <env_name> python
conda activate <env_name>
pip install romancal==0.17.1

Installing specific versions before romancal 0.17.0 need to be installed from Github:

conda create -n <env_name> python
conda activate <env_name>
pip install git+https://github.com/spacetelescope/romancal@0.16.2

Installing the development version from Github

You can install the latest development version (not as well tested) from the Github master branch:

conda create -n <env_name> python
conda activate <env_name>
pip install git+https://github.com/spacetelescope/romancal

Installing a DMS Operational Build

There may be occasions where an exact copy of an operational DMS build is desired (e.g. for validation testing or debugging operational issues). We package releases for DMS builds via environment snapshots that specify the exact versions of all packages to be installed. This method may result in more stable processing than what was outlined above for installing a particular tagged release, because that method installs the latest versions of dependency packages, while this method installs dependencies pinned to particular versions that have been well tested.

To install a particular DMS build, consult the Software vs DMS build version map table shown below to determine the correct roman tag. For example, to install the version of romancal used in DMS build 7.5, use romancal tag 0.16.1. The overall procedure is similar to the 3-step process outlined in the previous section, but the details of each command vary, due to the use of environment snapshot files that specify all of the particular packages to install. Also note that different snapshot files are used for Linux and Mac OS systems.

Linux:

conda create -n <env_name> --file https://ssb.stsci.edu/releases/romandp/0.16.1/conda_python_stable-deps.txt
conda activate <env_name>
pip install -r https://ssb.stsci.edu/releases/romandp/0.16.1/reqs_stable-deps.txt

MacOS:

conda create -n <env_name> --file https://ssb.stsci.edu/releases/romandp/0.16.1/conda_python_macos-stable-deps.txt
conda activate <env_name>
pip install -r https://ssb.stsci.edu/releases/romandp/0.16.1/reqs_macos-stable-deps.txt

Each DMS delivery has its own installation instructions, which may be found in the corresponding release documentation linked from this page: https://github.com/astroconda/astroconda-releases/tree/master/romandp The installation procedures may change from time to time, so consulting the documentation page for the specific version in question is the best way to get that version installed.

Installing for Developers

If you want to be able to work on and test the source code with the romancal package, the high-level procedure to do this is to first create a conda environment using the same procedures outlined above, but then install your personal copy of the code overtop of the original code in that environment. Again, this should be done in a separate conda environment from any existing environments that you may have already installed with released versions of the romancal package.

As usual, the first two steps are to create and activate an environment:

conda create -n <env_name> python
conda activate <env_name>

To install your own copy of the code into that environment, you first need to fork and clone the romancal repo:

cd <where you want to put the repo>
git clone https://github.com/spacetelescope/romancal
cd roman

Note: python setup.py install and python setup.py develop commands do not work.

Install from your local checked-out copy as an "editable" install:

pip install -e .

If you want to run the unit or regression tests and/or build the docs, you can make sure those dependencies are installed too:

pip install -e .[test]
pip install -e .[docs]
pip install -e .[test,docs]

Need other useful packages in your development environment?

pip install ipython pytest-xdist

Calibration References Data System (CRDS) Setup

CRDS is the system that manages the reference files needed to run the pipeline. Inside the STScI network, the pipeline works with default CRDS setup with no modifications. To run the pipeline outside the STScI network, CRDS must be configured by setting two environment variables:

export CRDS_PATH=$HOME/crds_cache
export CRDS_SERVER_URL=https://roman-crds.stsci.edu

Documentation

Documentation (built daily from the Github master branch) is available at:

https://roman-pipeline.readthedocs.io/en/latest/

To build the docs yourself, clone this repository and build the documentation with:

pip install -e .[docs]
cd docs
make html
make latexpdf

Contributions and Feedback

We welcome contributions and feedback on the project. Please follow the contributing guidelines to submit an issue or a pull request.

We strive to provide a welcoming community to all of our users by abiding with the Code of Conduct.

If you have questions or concerns regarding the software, please open an issue at https://github.com/spacetelescope/roman/issues or contact the ROMAN Help Desk.

Software vs DMS build version map

roman tag	DMS build	CRDS_CONTEXT	Date	Notes
0.1.0	0.0	003	Nov 2020	Release for Build 0.0

Note: CRDS_CONTEXT values flagged with an asterisk in the above table are estimates (formal CONTEXT deliveries are only provided with final builds).

Unit Tests

Unit tests can be run via pytest. Within the top level of your local roman repo checkout:

pip install -e .[test]
pytest

Need to parallelize your test runs over 8 cores?

pip install pytest-xdist
pytest -n 8

Regression Tests

TBD

nden/romancal