corp-extractor 0.2.4

Extract structured statements from text using T5-Gemma 2 and Diverse Beam Search

Corp Extractor

Extract structured subject-predicate-object statements from unstructured text using the T5-Gemma 2 model.

Features

• Structured Extraction: Converts unstructured text into subject-predicate-object triples
• Entity Type Recognition: Identifies 12 entity types (ORG, PERSON, GPE, LOC, PRODUCT, EVENT, etc.)
• Quality Scoring (v0.2.0): Each triple scored for groundedness (0-1) based on source text
• Beam Merging (v0.2.0): Combines top beams for better coverage instead of picking one
• Embedding-based Dedup (v0.2.0): Uses semantic similarity to detect near-duplicate predicates
• Predicate Taxonomies (v0.2.0): Normalize predicates to canonical forms via embeddings
• Contextualized Matching (v0.2.2): Compares full "Subject Predicate Object" against source text for better accuracy
• Entity Type Merging (v0.2.3): Automatically merges UNKNOWN entity types with specific types during deduplication
• Reversal Detection (v0.2.3): Detects and corrects subject-object reversals using embedding comparison
• Command Line Interface (v0.2.4): Full-featured CLI for terminal usage
• Multiple Output Formats: Get results as Pydantic models, JSON, XML, or dictionaries

Installation

# Recommended: include embedding support for smart deduplication
pip install corp-extractor[embeddings]

# Minimal installation (no embedding features)
pip install corp-extractor

Note: For GPU support, install PyTorch with CUDA first:

pip install torch --index-url https://download.pytorch.org/whl/cu121
pip install corp-extractor[embeddings]

Quick Start

from statement_extractor import extract_statements

result = extract_statements("""
    Apple Inc. announced the iPhone 15 at their September event.
    Tim Cook presented the new features to customers worldwide.
""")

for stmt in result:
    print(f"{stmt.subject.text} ({stmt.subject.type})")
    print(f"  --[{stmt.predicate}]--> {stmt.object.text}")
    print(f"  Confidence: {stmt.confidence_score:.2f}")  # NEW in v0.2.0

Command Line Interface

The library includes a CLI for quick extraction from the terminal.

Quick Run with uvx (No Installation)

Run directly without installing using uv:

# Run directly (downloads temporarily)
uvx corp-extractor "Apple announced a new iPhone."

# With embeddings support (recommended)
uvx --with sentence-transformers corp-extractor "Apple announced a new iPhone."

# Run with options
uvx --with sentence-transformers corp-extractor -f article.txt --json --beams 8

Install Globally with uv or pipx

# Install with uv (recommended)
uv tool install corp-extractor[embeddings]

# Or with pipx
pipx install corp-extractor[embeddings]

# Then use anywhere (both commands work)
statement-extractor "Your text here"
corp-extractor "Your text here"

Usage Examples

# Extract from text argument
statement-extractor "Apple Inc. announced the iPhone 15 at their September event."

# Extract from file
statement-extractor -f article.txt

# Pipe from stdin
cat article.txt | statement-extractor -

# Output as JSON
statement-extractor "Tim Cook is CEO of Apple." --json

# Output as XML
statement-extractor -f article.txt --xml

# Verbose output with confidence scores
statement-extractor -f article.txt --verbose

# Use more beams for better quality
statement-extractor -f article.txt --beams 8

# Use custom predicate taxonomy
statement-extractor -f article.txt --taxonomy predicates.txt

# Use GPU explicitly
statement-extractor -f article.txt --device cuda

CLI Options

Usage: statement-extractor [OPTIONS] [TEXT]

Options:
  -f, --file PATH              Read input from file
  -o, --output [table|json|xml] Output format (default: table)
  --json                       Output as JSON (shortcut)
  --xml                        Output as XML (shortcut)
  -b, --beams INTEGER          Number of beams (default: 4)
  --diversity FLOAT            Diversity penalty (default: 1.0)
  --max-tokens INTEGER         Max tokens to generate (default: 2048)
  --no-dedup                   Disable deduplication
  --no-embeddings              Disable embedding-based dedup (faster)
  --no-merge                   Disable beam merging
  --dedup-threshold FLOAT      Deduplication threshold (default: 0.65)
  --min-confidence FLOAT       Min confidence filter (default: 0)
  --taxonomy PATH              Load predicate taxonomy from file
  --taxonomy-threshold FLOAT   Taxonomy matching threshold (default: 0.5)
  --device [auto|cuda|cpu]     Device to use (default: auto)
  -v, --verbose                Show confidence scores and metadata
  -q, --quiet                  Suppress progress messages
  --version                    Show version
  --help                       Show this message

New in v0.2.0: Quality Scoring & Beam Merging

By default, the library now:

• Scores each triple for groundedness based on whether entities appear in source text
• Merges top beams instead of selecting one, improving coverage
• Uses embeddings to detect semantically similar predicates ("bought" ≈ "acquired")

from statement_extractor import ExtractionOptions, ScoringConfig

# Precision mode - filter low-confidence triples
scoring = ScoringConfig(min_confidence=0.7)
options = ExtractionOptions(scoring_config=scoring)
result = extract_statements(text, options)

# Access confidence scores
for stmt in result:
    print(f"{stmt} (confidence: {stmt.confidence_score:.2f})")

New in v0.2.0: Predicate Taxonomies

Normalize predicates to canonical forms using embedding similarity:

from statement_extractor import PredicateTaxonomy, ExtractionOptions

taxonomy = PredicateTaxonomy(predicates=[
    "acquired", "founded", "works_for", "announced",
    "invested_in", "partnered_with"
])

options = ExtractionOptions(predicate_taxonomy=taxonomy)
result = extract_statements(text, options)

# "bought" -> "acquired" via embedding similarity
for stmt in result:
    if stmt.canonical_predicate:
        print(f"{stmt.predicate} -> {stmt.canonical_predicate}")

New in v0.2.2: Contextualized Matching

Predicate canonicalization and deduplication now use contextualized matching:

• Compares full "Subject Predicate Object" strings against source text
• Better accuracy because predicates are evaluated in context
• When duplicates are found, keeps the statement with the best match to source text

This means "Apple bought Beats" vs "Apple acquired Beats" are compared holistically, not just "bought" vs "acquired".

New in v0.2.3: Entity Type Merging & Reversal Detection

Entity Type Merging

When deduplicating statements, entity types are now automatically merged. If one statement has UNKNOWN type and a duplicate has a specific type (like ORG or PERSON), the specific type is preserved:

# Before deduplication:
# Statement 1: AtlasBio Labs (UNKNOWN) --sued by--> CuraPharm (ORG)
# Statement 2: AtlasBio Labs (ORG) --sued by--> CuraPharm (ORG)

# After deduplication:
# Single statement: AtlasBio Labs (ORG) --sued by--> CuraPharm (ORG)

Subject-Object Reversal Detection

The library now detects when subject and object may have been extracted in the wrong order by comparing embeddings against source text:

from statement_extractor import PredicateComparer

comparer = PredicateComparer()

# Automatically detect and fix reversals
fixed_statements = comparer.detect_and_fix_reversals(statements)

for stmt in fixed_statements:
    if stmt.was_reversed:
        print(f"Fixed reversal: {stmt}")

How it works:

1. For each statement with source text, compares:
   • "Subject Predicate Object" embedding vs source text
   • "Object Predicate Subject" embedding vs source text
2. If the reversed form has higher similarity, swaps subject and object
3. Sets was_reversed=True to indicate the correction

During deduplication, reversed duplicates (e.g., "A -> P -> B" and "B -> P -> A") are now detected and merged, with the correct orientation determined by source text similarity.

Disable Embeddings (Faster, No Extra Dependencies)

options = ExtractionOptions(
    embedding_dedup=False,  # Use exact text matching
    merge_beams=False,      # Select single best beam
)
result = extract_statements(text, options)

Output Formats

from statement_extractor import (
    extract_statements,
    extract_statements_as_json,
    extract_statements_as_xml,
    extract_statements_as_dict,
)

# Pydantic models (default)
result = extract_statements(text)

# JSON string
json_output = extract_statements_as_json(text)

# Raw XML (model's native format)
xml_output = extract_statements_as_xml(text)

# Python dictionary
dict_output = extract_statements_as_dict(text)

Batch Processing

from statement_extractor import StatementExtractor

extractor = StatementExtractor(device="cuda")  # or "cpu"

texts = ["Text 1...", "Text 2...", "Text 3..."]
for text in texts:
    result = extractor.extract(text)
    print(f"Found {len(result)} statements")

Entity Types

Type	Description	Example
ORG	Organizations	Apple Inc., United Nations
PERSON	People	Tim Cook, Elon Musk
GPE	Geopolitical entities	USA, California, Paris
LOC	Non-GPE locations	Mount Everest, Pacific Ocean
PRODUCT	Products	iPhone, Model S
EVENT	Events	World Cup, CES 2024
WORK_OF_ART	Creative works	Mona Lisa, Game of Thrones
LAW	Legal documents	GDPR, Clean Air Act
DATE	Dates	2024, January 15
MONEY	Monetary values	$50 million, €100
PERCENT	Percentages	25%, 0.5%
QUANTITY	Quantities	500 employees, 1.5 tons
UNKNOWN	Unrecognized	(fallback)

How It Works

This library uses the T5-Gemma 2 statement extraction model with Diverse Beam Search (Vijayakumar et al., 2016):

1. Diverse Beam Search: Generates 4+ candidate outputs using beam groups with diversity penalty
2. Quality Scoring (v0.2.0): Each triple scored for groundedness in source text
3. Beam Merging (v0.2.0): Top beams combined for better coverage
4. Embedding Dedup (v0.2.0): Semantic similarity removes near-duplicate predicates
5. Predicate Normalization (v0.2.0): Optional taxonomy matching via embeddings
6. Contextualized Matching (v0.2.2): Full statement context used for canonicalization and dedup
7. Entity Type Merging (v0.2.3): UNKNOWN types merged with specific types during dedup
8. Reversal Detection (v0.2.3): Subject-object reversals detected and corrected via embedding comparison

Requirements

• Python 3.10+
• PyTorch 2.0+
• Transformers 4.35+
• Pydantic 2.0+
• sentence-transformers 2.2+ (optional, for embedding features)
• ~2GB VRAM (GPU) or ~4GB RAM (CPU)

Links

• Model on HuggingFace
• Web Demo
• Diverse Beam Search Paper
• Corp-o-Rate

License

MIT License - see LICENSE file for details.