INDRA (Integrated Network and Dynamical Reasoning Assembler) is an automated model assembly system, originally developed for molecular systems biology and currently being generalized to other domains. INDRA draws on natural language processing systems and structured databases to collect mechanistic and causal assertions, represents them in a standardized form (INDRA Statements), and assembles them into various modeling formalisms including causal graphs and dynamical models.
At the core of INDRA are its knowledge-level assembly procedures, allowing sources to be assembled into coherent models, a process that involves correcting systematic input errors, finding and resolving redundancies, inferring missing information, filtering to a relevant scope and assessing the reliability of causal information.
The detailed INDRA documentation is available at http://indra.readthedocs.io.
INDRA is currently integrated with the following natural language processing
systems and structured databases. These input modules (available in
indra.sources) all produce INDRA Statements.
General purpose causal relation reading systems:
Biology-oriented reading systems:
Biological pathway databases:
|Database / Exchange format||Module||Reference|
|PathwayCommons / BioPax||
|Large Corpus / BEL||
|Target Affinity Spectrum||
|LINCS small molecules||
Custom knowledge bases:
|Database / Exchange format||Module||Reference|
|NDEx / CX||
|INDRA DB / INDRA Statements||
Output model assemblers
INDRA also provides several model output assemblers that take INDRA Statements as input. The most sophisticated model assembler is the PySB Assembler, which implements a policy-guided automated assembly procedure of a rule-based executable model (that can then be further compiled into other formats such as SBML, Kappa, BNGL and SBGN to connect to a vast ecosystem of downstream tools). Several other model assembly modules target various network formats for visualization, and graph/structural analysis (PyBEL, CyJS, Graphviz, SBGN, CX, SIF, etc.) and curation (HTML, TSV, IndexCards). Finally, the English Assembler produces English language descriptions of a set of INDRA Statements.
INDRA also supports extension by outside model assembly tools which take INDRA Statements as input and produce models. One such example is Delphi (https://github.com/ml4ai/delphi), which is a Dynamic Bayesian Network model assembler. Similarly, outside tools that support INDRA Statements can implement custom visualization methods, such as CauseMos, developed by Uncharted Software (https://uncharted.software/).
Assemblers aimed at model-driven discovery and analysis:
|Modeling formalism / Exchange format||Purpose||Module||Reference|
|PySB (-> SBML, SBGN, BNGL, Kappa, etc.)||Detailed, mechanistic modeling, simulation, analysis||
|PyBEL||Causal analysis, visualization||
|SIF||Network analysis, logic modeling, visualization||
|Figaro||Bayesian network inference||
|KAMI||Knowledge aggregation of protein sites/states and Kappa modeling||
Assemblers primarily aimed at visualization:
|Network / Exchange format||Purpose||Module||Reference|
|Causal Analysis Graph||General causal graph visualization||
|CX||Network browsing, versioning on NDEx||
|Cytoscape JS||Interactive Cytoscape JS network to embed in websites||
|Graphviz||Static PDF/PNG visualization with powerful automated layout using Graphviz||
|SBGN||Visualization with Systems Biology Graphical Notation||
Assemblers primarily aimed at expert curation and browsing:
|English language||Human-readable descriptions, reports, dialogue||
|HTML||Web-based browsing, linking out to provenance, curation||
|TSV (Tab/Comma Separated Values)||Spreadsheet-based browsing and curation||
|Index Cards||Custom JSON format for curating biological mechanisms||
Internal knowledge assembly
A key feature of INDRA is providing internal knowledge-assembly modules that operate on INDRA Statements and perform the following tasks:
- Redundancy/subsumption/generalization/contradiction finding and resolution
with respect to an ontology with the Preassembler
- Belief calculation based on evidence using the BeliefEngine
- Mapping grounding between multiple ontologies
- Grounding override and disambiguation
- Protein sequence mapping (
The internal assembly steps of INDRA including the ones listed above, and also a large collection of filters (filter by source, belief, the presence of grounding information, semantic filters by entity role, etc.) are exposed in the indra.tools.assemble_corpus submodule. This submodule contains functions that take Statements as input and produce processed Statements as output. They can be composed to form an assembly pipeline connecting knowledge collected from sources with an output model.
INDRA also contains utility modules to access literature content (e.g. PubMed), ontological information (e.g. UniProt, HGNC), and other resources.
Gyori B.M., Bachman J.A., Subramanian K., Muhlich J.L., Galescu L., Sorger P.K. From word models to executable models of signaling networks using automated assembly (2017), Molecular Systems Biology, 13, 954.
For detailed installation instructions, see the documentation.
INDRA currently supports Python 3.5+. The last release of INDRA compatible with Python 2.7 was 1.10.
The preferred way to install INDRA is by pointing pip to the source repository as
$ pip install git+https://github.com/sorgerlab/indra.git
Releases of INDRA are also available on PyPI, you can install the latest release as
$ pip install indra
However, releases will usually be behind the latest code available in this repository.
INDRA depends on a few standard Python packages. These packages are installed by pip during setup. For certain modules and use cases, other “extra” dependencies may be needed, which are described in detail in the documentation.
INDRA REST API
A REST API for INDRA is available at http://api.indra.bio:8000 with documentation at http://www.indra.bio/rest_api/docs. Note that the REST API is ideal for prototyping and for building light-weight web apps, but should not be used for large reading and assembly workflows.
INDRA is available as a Docker image on Dockerhub and can be pulled as
docker pull labsyspharm/indra
You can run the INDRA REST API using the container as
docker run -id -p 8080:8080 --entrypoint python labsyspharm/indra /sw/indra/rest_api/api.py
To build the image locally, there are currently two Dockerfiles for INDRA and its dependencies. They are available in the following repositories:
In this example INDRA assembles a PySB model from the natural language description of a mechanism via the TRIPS reading web service.
from indra.sources import trips from indra.assemblers.pysb import PysbAssembler pa = PysbAssembler() # Process a natural language description of a mechanism trips_processor = trips.process_text('MEK2 phosphorylates ERK1 at Thr-202 and Tyr-204') # Collect extracted mechanisms in PysbAssembler pa.add_statements(trips_processor.statements) # Assemble the model model = pa.make_model(policies='two_step')
INDRA also provides an interface for the REACH natural language processor. In this example, a full paper from PubMed Central is processed. The paper’s PMC ID is PMC3717945.
from indra.sources import reach # Process the neighborhood of BRAF and MAP2K1 reach_processor = reach.process_pmc('3717945')
At this point,
reach_processor.statements contains a list of INDRA statements
extracted from the PMC paper.
Next we look at an example of reading the 10 most recent PubMed abstracts on BRAF and collecting the results in INDRA statements.
from indra.sources import reach from indra.literature import pubmed_client # Search for 10 most recent abstracts in PubMed on 'BRAF' pmids = pubmed_client.get_ids('BRAF', retmax=10) all_statements =  for pmid in pmids: abs = pubmed_client.get_abstract(pmid) if abs is not None: reach_processor = reach.process_text(abs) if reach_processor is not None: all_statements += reach_processor.statements
At this point, the
all_statements list contains all the statements
extracted from the 10 abstracts.
The next example shows querying the BEL large corpus network for a neighborhood of a given list of proteins using their HGNC gene names. This example performs the query via PyBEL.
from indra.sources import bel # Process the neighborhood of BRAF and MAP2K1 bel_processor = bel.process_pybel_neighborhood(['BRAF', 'MAP2K1'])
At this point,
bel_processor.statements contains a list of INDRA statements
extracted from the neighborhood query.
Next, we look at an example of querying the Pathway Commons database for paths between two lists of proteins. Note: see installation notes above for installing pyjnius, which is required for using the BioPAX API of INDRA.
from indra.sources import biopax # Process the neighborhood of BRAF and MAP2K1 biopax_processor = biopax.process_pc_pathsfromto(['BRAF', 'RAF1'], ['MAP2K1', 'MAP2K2'])
At this point,
biopax_processor.statements contains a list of INDRA
Statements extracted from the paths-from-to query.
The development of INDRA has been funded from the following sources:
|DARPA Big Mechanism||W911NF-14-1-0397|
|DARPA World Modelers||W911NF-18-1-0014|
|DARPA Communicating with Computers||W911NF-15-1-0544|
|DARPA Automated Scientific Discovery Fraemwork||W911NF018-1-0124|
|DARPA Automating Scientific Knowledge Extraction||HR00111990009|