netan 2.1.4

Network builder for multi-omics matrices.

netan

netan is a network analysis library for omics data. It builds sample or feature graphs from one or more matrices, tunes graph construction, ranks features against sample labels, and exports publication-ready or Cytoscape-ready outputs.

It works naturally with rodin and Rodin-like objects.

Web app: netan.io

Highlights

• Build graphs in samples or features mode.
• Work with single-omics or multilayer multi-omics data.
• Use spearman, clr, rf, or glasso inference.
• Tune graph construction with a reusable grid -> scores_grid -> materialize workflow.
• Rank features with graph-aware label separation statistics.
• Visualize interactively with Plotly and export edge tables directly.

Installation

pip install netan

Requires Python >=3.10.

Quick start

import rodin
import netan

r1 = rodin.create("metabolomics.csv", "meta.csv")
r2 = rodin.create("transcriptomics.csv", "meta.csv")

r1.transform()
r2.transform()

nt = netan.create([r1, r2])

nt.build(
    method="spearman",
    node_mode="samples",
    layer_mode="multilayer",
)

nt.plot(color="Group", title="Sample network")

Core workflow

Build

nt.build(
    method="rf",
    node_mode="samples",
    layer_mode="multilayer",
    k="auto",
)

If you do not pass thresholds, netan sparsifies automatically through auto_target.

Inspect

nt.info()
nt.params()
nt.scores()
nt.edges()

Tune

nt.tune(label="Group")
nt.best()

For repeated score iteration on the same candidate space:

nt.grid()

nt.scores_grid(
    label="Group",
    weights={
        "sep": [15, 5, 80],
        "supervised": [60, 15, 15, 10],
    },
)

nt.materialize()

Rank and shortlist

nt.rank("Group")
nt.stability_rank("Group")
nt_small = nt.shortlist(p_adj_max=0.01)

This workflow is available in samples mode and is useful when you want graph-aware feature selection before rebuilding a smaller network.

Concepts

Node mode

• samples: nodes are samples and edges represent sample similarity
• features: nodes are features and multilayer builds can include cross-omics feature edges

Layer mode

• stack: one combined graph
• multilayer: per-layer graphs plus integrated outputs

Methods

• spearman: correlation-based
• clr: mutual-information based
• rf: ExtraTrees similarity
• glasso: sparse precision graph

Sparsity controls

• auto_target: default thresholding control
• k=None: threshold-only graph
• k="auto": adaptive kNN pruning
• mutual=True: stricter kNN graph
• attach_isolates=True: reconnect isolates after sparsification

Tuning model

tune() separates expensive candidate construction from cheap rescoring:

• grid(): build all candidate graph states once
• scores_grid(): score the grid in unsupervised or supervised mode
• materialize(): restore any leaderboard row as a live Netan object

This makes it practical to iterate on score weights without rerunning inference.

Visualization and export

nt.plot(layout="kamada_kawai", color="Group")
nt.export("edges.csv")

Supported layouts:

• force-directed
• spring
• circular
• kamada_kawai
• random

Persistence

path = nt.save("netan.pkl")
nt2 = netan.load(path)

This restores stored graphs, rankings, caches, and tuning grids. The live Plotly figure handle is not serialized.

Input contract

netan expects one object or a list of objects exposing:

• r.X: pandas.DataFrame with shape features x samples
• r.samples: pandas.DataFrame whose first column contains sample IDs aligned to r.X.columns
• r.features: optional feature metadata

Rodin already matches this layout.

Public API

Main entry points:

• netan.create(...)
• netan.load(path)
• Netan.build(...)
• Netan.adjust(...)
• Netan.grid(...)
• Netan.scores_grid(...)
• Netan.materialize(...)
• Netan.tune(...)
• Netan.rank(...)
• Netan.stability_rank(...)
• Netan.shortlist(...)
• Netan.plot(...)
• Netan.export(...)
• Netan.save(path)

For exact parameters, use the Python docstrings.

Notes

• samples mode is where label-aware tuning and rank() make the most sense.
• features mode is the right choice for variable-level network exploration.
• For larger graphs, spearman, clr, and rf are usually the practical defaults.

License

MIT