Triple

T15362781
Position Surface form Disambiguated ID Type / Status
Subject Pulaski (CTA Blue Line station) E367330 entity
Predicate serves P98 FINISHED
Object Forest Park branch of the Blue Line
The Forest Park branch of the Blue Line is a western segment of Chicago’s rapid transit system that runs between downtown and the suburb of Forest Park.
E1155688 NE FINISHED

How this triple was built (4 steps)

Every LLM step that produced this triple, in pipeline order — named-entity classification, the disambiguation choices (the exact options shown, with the pick highlighted), and the generated description. The batch + timestamp of each is in the Provenance table below.

NER Named-entity recognition gpt-5-mini
Instruction
Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).
Input
Phrase: Forest Park branch of the Blue Line | Statement: [Pulaski (CTA Blue Line station), serves, Forest Park branch of the Blue Line]
NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07
Target entity: Forest Park branch of the Blue Line
Context triple: [Pulaski (CTA Blue Line station), serves, Forest Park branch of the Blue Line]
  • A. Ravenswood branch (Brown Line)
    The Ravenswood branch of Chicago's Brown Line is an elevated rapid transit route on the city's North Side, serving neighborhoods such as Lincoln Park, Lakeview, and Ravenswood and connecting them to the Loop.
  • B. O'Hare branch of the Blue Line
    The O'Hare branch of the Blue Line is the Chicago 'L' rapid transit segment that runs northwest from downtown Chicago to O'Hare International Airport.
  • C. Metra at Forest Park
    Metra at Forest Park is a commuter rail station in Forest Park, Illinois, serving Metra’s Union Pacific West Line and providing regional rail connections to and from Chicago.
  • D. Blue Line at Clark/Lake
    The Blue Line at Clark/Lake is a major Chicago 'L' rapid transit stop in the Loop, serving the Blue Line within the large Clark/Lake station complex.
  • E. Oak Park station (Blue Line)
    Oak Park station (Blue Line) is an elevated Chicago Transit Authority rapid transit stop in Oak Park, Illinois, serving the Forest Park branch of the Blue Line.
  • F. None of above. chosen
  • G. Unsure - the case is ambiguous/there is not enough information to decide.
NEDg Description generation gpt-5.1
Instruction
Generate a one-sentence description of the target entity. 
You are given a context triple in the form (subject, predicate, object), where the object is the target entity. 
# Instructions
Use the triple to infer relevant information about the entity. Describe the entity based on what is most defining, well-known. 
Avoid repeating the information from the triple, unless really essential.
# Response Format
Return only the sentence: "Description: [one-sentence description of the target entity]"
Input
Entity: Forest Park branch of the Blue Line
Triple: [Pulaski (CTA Blue Line station), serves, Forest Park branch of the Blue Line]
Generated description
The Forest Park branch of the Blue Line is a western segment of Chicago’s rapid transit system that runs between downtown and the suburb of Forest Park.
NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07
Target entity: Forest Park branch of the Blue Line
Target entity description: The Forest Park branch of the Blue Line is a western segment of Chicago’s rapid transit system that runs between downtown and the suburb of Forest Park.
  • A. Ravenswood branch (Brown Line)
    The Ravenswood branch of Chicago's Brown Line is an elevated rapid transit route on the city's North Side, serving neighborhoods such as Lincoln Park, Lakeview, and Ravenswood and connecting them to the Loop.
  • B. O'Hare branch of the Blue Line
    The O'Hare branch of the Blue Line is the Chicago 'L' rapid transit segment that runs northwest from downtown Chicago to O'Hare International Airport.
  • C. Metra at Forest Park
    Metra at Forest Park is a commuter rail station in Forest Park, Illinois, serving Metra’s Union Pacific West Line and providing regional rail connections to and from Chicago.
  • D. Blue Line at Clark/Lake
    The Blue Line at Clark/Lake is a major Chicago 'L' rapid transit stop in the Loop, serving the Blue Line within the large Clark/Lake station complex.
  • E. Oak Park station (Blue Line)
    Oak Park station (Blue Line) is an elevated Chicago Transit Authority rapid transit stop in Oak Park, Illinois, serving the Forest Park branch of the Blue Line.
  • F. None of above. chosen

Provenance (5 batches)

The batch behind each pipeline step, in order, with when it ran. Timestamps are batch-level — stages were processed in waves, so the object chain (NER → NED1 → NEDg → NED2) reads in order, but predicate / elicitation batches can sit in a different wave.

Step Stage Batch ID Status When
creating Elicitation batch_69d85a1483788190ad93c2748e8af34b completed April 10, 2026, 2:01 a.m.
NER Named-entity recognition batch_69e03e479f188190bbbc3dcd73853e02 completed April 16, 2026, 1:41 a.m.
NED1 Entity disambiguation (via context triple) batch_69ff1a6991148190b522684b35c07b1a completed May 9, 2026, 11:28 a.m.
NEDg Description generation batch_69ff1b3c563481908418411a977df343 completed May 9, 2026, 11:32 a.m.
NED2 Entity disambiguation (via description) batch_69ff1c0ad5448190903dc38f78512f3b completed May 9, 2026, 11:35 a.m.
Created at: April 10, 2026, 3:18 a.m.