https://github.com/cgat-developers/ruffus

CGAT-ruffus is a lightweight python module for running computational pipelines
https://github.com/cgat-developers/ruffus

Last synced: 30 days ago
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CGAT-ruffus is a lightweight python module for running computational pipelines

• Host: GitHub
• URL: https://github.com/cgat-developers/ruffus
• Owner: cgat-developers
• License: mit
• Created: 2013-01-06T22:20:24.000Z (almost 12 years ago)
• Default Branch: master
• Last Pushed: 2021-07-12T08:12:28.000Z (over 3 years ago)
• Last Synced: 2024-05-15T20:35:21.267Z (7 months ago)
• Language: Python
• Homepage:
• Size: 24.8 MB
• Stars: 171
• Watchers: 11
• Forks: 34
• Open Issues: 49
• Metadata Files:
  • Readme: README.rst
  • Changelog: CHANGES.TXT
  • License: LICENSE.TXT

Awesome Lists containing this project

• Awesome-Bioinformatics - Ruffus - Computation Pipeline library for python widely used in science and bioinformatics. [ [paper-2010](https://pubmed.ncbi.nlm.nih.gov/20847218) | [web](http://www.ruffus.org.uk) ] (Next Generation Sequencing / Workflow Managers)

README

        
===========

CGAT-ruffus

===========

***************************************

Overview

***************************************

The ruffus module is a lightweight way to add support

for running computational pipelines.

Computational pipelines are often conceptually quite simple, especially

if we breakdown the process into simple stages, or separate **tasks**.

Each stage or **task** in a computational pipeline is represented by a python function

Each python function can be called in parallel to run multiple **jobs**.

Ruffus was originally designed for use in bioinformatics to analyse multiple genome

data sets.

More recently, we have extended the functionality of CGAT-ruffus to include cluster integration (Currently

support SGE, SLURM and PBS-pro/Torque), paramaterisation, logging, database integration

and conda environment switching. `CGAT-core `_ code and `documentation `_.

***************************************

Documentation

***************************************

Ruffus documentation can be found `here `_ ,

with `installation notes `_ , and

an `in-depth manual `_ .

However, to utilise the full power of this workflow management system we recomend

using `CGAT-core `_ (`documentation `_).

***************************************

Background

***************************************

The purpose of a pipeline is to determine automatically which parts of a multi-stage

process needs to be run and in what order in order to reach an objective ("targets")

Computational pipelines, especially for analysing large scientific datasets are

in widespread use.

However, even a conceptually simple series of steps can be difficult to set up and

to maintain, perhaps because the right tools are not available.

***************************************

Design

***************************************

The ruffus module has the following design goals:

* Simplicity. Can be picked up in 10 minutes

* Elegance

* Lightweight

* Unintrusive

* Flexible/Powerful

***************************************

Features

***************************************

Automatic support for

* Managing dependencies

* Parallel jobs

* Re-starting from arbitrary points, especially after errors

* Display of the pipeline as a flowchart

* Reporting

***************************************

A Simple example

***************************************

Use the **@transform(...)** python decorator before the function definitions:

  .. code-block:: python

    from ruffus import *

    # make 10 dummy DNA data files

    data_files = [(prefix + ".fastq") for prefix in range("abcdefghij")]

    for df in data_files:

        open(df, "w").close()

    @transform(data_files, suffix(".fastq"), ".bam")

    def run_bwa(input_file, output_file):

        print "Align DNA sequences in %s to a genome -> %s " % (input_file, output_file)

        # make dummy output file

        open(output_file, "w").close()

    @transform(run_bwa, suffix(".bam"), ".sorted.bam")

    def sort_bam(input_file, output_file):

        print "Sort DNA sequences in %s -> %s " % (input_file, output_file)

        # make dummy output file

        open(output_file, "w").close()

    pipeline_run([sort_bam], multithread = 5)

the ``@transform`` decorator indicate that the data flows from the ``run_bwa`` function to ``sort_bwa`` down

the pipeline.

********

Usage

********

Each stage or **task** in a computational pipeline is represented by a python function

Each python function can be called in parallel to run multiple **jobs**.

1. Import module::

        import ruffus

1. Annotate functions with python decorators

2. Print dependency graph if you necessary

    - For a graphical flowchart in ``jpg``, ``svg``, ``dot``, ``png``, ``ps``, ``gif`` formats::

        pipeline_printout_graph ("flowchart.svg")

    This requires ``dot`` to be installed

    - For a text printout of all jobs ::

        pipeline_printout(sys.stdout)

3. Run the pipeline::

    pipeline_run(list_of_target_tasks, verbose = NNN, [multithread | multiprocess = NNN])