reasongraph 0.3.0

A graph-based reasoning library with embedding search and multi-hop traversal

ReasonGraph

A graph-based reasoning library with embedding search, multi-hop traversal, and automatic entity/causal extraction.

Installation

pip install reasongraph[all]        # everything included

Or install only what you need:

pip install reasongraph             # core: in-memory backend, NER extraction, embeddings
pip install reasongraph[sqlite]     # + SQLite backend with sqlite-vec
pip install reasongraph[gliner2]    # + GLiNER2 entity + causal extraction (recommended)
pip install reasongraph[postgres]   # + PostgreSQL + pgvector backend

Quick Start

Using a built-in dataset

from reasongraph import ReasonGraph

graph = ReasonGraph()
graph.initialize_sync()
graph.load_dataset_sync("financial")

results = graph.query_sync("What caused the 2008 financial crisis?")
for i, text in enumerate(results, 1):
    print(f"{i}. {text}")

graph.close_sync()

Output -- a connected reasoning chain, not just keyword matches:

1. Lehman Brothers filed for bankruptcy in September 2008 after massive MBS losses.
2. Loose lending standards fueled a housing price bubble across the United States.
3. Lehman's collapse triggered a global credit freeze as interbank lending stopped.
4. Mortgage-backed securities built on subprime loans collapsed when defaults surged.
5. The U.S. government enacted TARP, a $700 billion bailout to stabilize the financial system.
6. Banks issued subprime mortgages to borrowers with poor credit histories.

Parsing free-form text

For free-form text, install with pip install reasongraph[gliner2] to get automatic entity and causal relation extraction.

from reasongraph import ReasonGraph

graph = ReasonGraph()
graph.initialize_sync()

graph.add_text_sync("Lehman Brothers filed for bankruptcy in September 2008 after massive MBS losses.")
graph.add_text_sync("The U.S. government enacted TARP, a $700 billion bailout to stabilize the financial system.")
graph.add_text_sync("The Federal Reserve cut interest rates to near zero after the 2008 crisis.")

results = graph.query_sync("What happened after Lehman collapsed?")
for i, text in enumerate(results, 1):
    print(f"{i}. {text}")

graph.close_sync()

1. Lehman Brothers filed for bankruptcy in September 2008 after massive MBS losses.
2. The Federal Reserve cut interest rates to near zero after the 2008 crisis.
3. The U.S. government enacted TARP, a $700 billion bailout to stabilize the financial system.

Async API

import asyncio
from reasongraph import ReasonGraph

async def main():
    async with ReasonGraph() as graph:
        await graph.load_dataset("financial")
        results = await graph.query("What caused the 2008 crisis?")
        for text in results:
            print(text)

asyncio.run(main())

Features

• Automatic extraction -- GLiNER2 extracts entities and causal relations in one pass (falls back to BERT NER when gliner2 is not installed)
• Hybrid search -- combine embedding similarity, keyword (trigram) matching, or both
• Multi-hop traversal -- follow graph edges to discover connected reasoning chains
• Cross-encoder reranking -- rerank results at each hop with ms-marco-MiniLM-L-6-v2
• Built-in datasets -- load curated reasoning graphs for immediate use
• Async-first -- native async API with sync convenience wrappers
• Pluggable backends -- in-memory (zero-config default), SQLite, or PostgreSQL with pgvector

Built-in Datasets

Dataset	Description
syllogisms	Classical syllogistic reasoning chains
causal	Cause-effect reasoning with entity annotations
taxonomy	Hierarchical concept taxonomy
financial	Financial crisis causal chains (2008 crisis, dot-com, inflation, eurozone)
medical	Medical causal chains (heart disease, diabetes, infectious disease, cancer)
analysis_patterns	Data analysis reasoning: scenario detection, technique selection, implementation patterns

graph.load_dataset_sync("financial")

Search Modes

# Pure embedding similarity (default)
results = graph.query_sync("credit freeze", search_mode="embedding")

# Pure keyword/trigram matching
results = graph.query_sync("credit freeze", search_mode="keyword")

# Hybrid: Reciprocal Rank Fusion of embedding + trigram rankings
results = graph.query_sync("credit freeze", search_mode="hybrid")

# Tune the RRF smoothing constant (default 60, lower = more weight to top ranks)
results = graph.query_sync("credit freeze", search_mode="hybrid", rrf_k=30)

Entity and Causal Extraction

When gliner2 is installed, add_text() / add_texts() automatically use GLiNER2 for both entity extraction and causal relation detection. Without gliner2, it falls back to BERT NER (entities only).

from reasongraph import ReasonGraph, NERExtractor, GLiNER2Extractor

graph = ReasonGraph()
graph.initialize_sync()

# Default: GLiNER2 (entities + causal relations) if installed, else BERT NER
entities = graph.add_text_sync("Apple released the iPhone in 2007.")
print(entities)  # ['Apple', 'iPhone']

# Explicit: force BERT NER even if GLiNER2 is installed
entities = graph.add_text_sync("Apple released the iPhone in 2007.", extractor=NERExtractor())

# Explicit: GLiNER2 with custom entity types
gliner = GLiNER2Extractor(entity_types=["company", "product", "date"])
entities = graph.add_text_sync("Apple released the iPhone in 2007.", extractor=gliner)

# Any callable works
entities = graph.add_text_sync("some text", extractor=lambda t: ["custom"])

Backends

By default, ReasonGraph() uses a pure Python in-memory backend (MemoryBackend). This works everywhere with zero dependencies beyond numpy. For persistence, pass a file path to save/load as JSON:

from reasongraph import ReasonGraph, MemoryBackend

# In-memory only (default)
graph = ReasonGraph()

# In-memory with JSON file persistence (loads on init, saves on close)
graph = ReasonGraph(backend=MemoryBackend(file_path="graph.json"))

SQLite Backend

For larger graphs or concurrent access, use the SQLite backend with sqlite-vec for vector search. Requires pip install reasongraph[sqlite].

from reasongraph import ReasonGraph
from reasongraph.backends import SqliteBackend

graph = ReasonGraph(backend=SqliteBackend(db_path="graph.db"))

PostgreSQL Backend

from reasongraph import ReasonGraph
from reasongraph.backends import PostgresBackend

graph = ReasonGraph(backend=PostgresBackend(database_url="postgresql://user:pass@localhost/db"))

Requires pip install reasongraph[postgres] and the pgvector + pg_trgm extensions enabled on your database.

Evaluation: Mixed-Domain Reasoning

We evaluate reasoning quality by loading all 6 built-in datasets into a single graph (~130 text nodes, ~104 entity nodes, ~280 edges) and testing whether the library can trace the correct causal chains, syllogistic proofs, taxonomic hierarchies, and data analysis patterns -- without being distracted by unrelated facts from other domains.

32 test cases simulate agent-style queries like "I need to understand what caused the 2008 financial crisis", "How does insulin resistance lead to kidney failure?", or "I have two numeric columns, check if related" and check whether the returned reasoning chain matches the expected ground truth.

Per-domain results (hybrid search, top_k=5, hops=4, rerank_top_k=4):

Domain	Cases	Chain Completeness	Recall@5	Precision@5	Domain Accuracy
Causal	5	100%	100%	92%	100%
Financial	6	100%	82%	60%	100%
Medical	5	100%	92%	76%	92%
Syllogisms	5	100%	100%	92%	85%
Taxonomy	3	100%	83%	53%	92%
Analysis Patterns	8	96%	75%	45%	96%
Overall	32	99%	88%	68%	95%

32/32 cases pass (>= 50% chain completeness). Split reranking gives chain continuations (text-to-text edges) priority over bridge discoveries (entity-to-text edges), keeping traversal focused.

Search mode comparison:

Mode	Chain Completeness	Recall@5	Precision@5	Domain Accuracy
Embedding	99%	88%	68%	95%
Keyword	0%	0%	0%	0%
Hybrid	99%	88%	68%	95%

Keyword-only mode scores 0% because the eval queries are natural language questions that don't substring-match the dataset's declarative statements. This is expected -- keyword search is designed for known-term lookups, not question answering.

Reproduce: uv run python tests/eval_financial_reasoning.py

API Reference

ReasonGraph(backend=None, embed_model=None, rerank_model=None, forget_after=30)

Method	Description
add_nodes(nodes)	Add (content, type) tuples to the graph
add_edges(edges)	Add (from, to) content edges
add_text(text, extractor=None)	Add text with automatic entity extraction
add_texts(texts, extractor=None, causal_extractor=None)	Batch add with entity + causal extraction (auto-enabled with GLiNER2)
query(query, top_k=5, hops=4, rerank_top_k=4, search_mode="embedding", rrf_k=60)	Search and traverse the graph
load_dataset(name)	Load a built-in dataset
delete_stale()	Remove nodes not accessed within forget_after days
get_all_nodes() / get_all_edges()	Inspect graph contents

All methods are async. Sync variants are available with a _sync suffix (e.g. query_sync).

License

MIT