Triple

T3578904
Position Surface form Disambiguated ID Type / Status
Subject Union Square/Market Street station E75752 entity
Predicate isPartOfProject P14971 FINISHED
Object San Francisco Central Subway project
The San Francisco Central Subway project is a major Muni Metro light rail extension in San Francisco designed to improve north–south transit connectivity by linking neighborhoods such as SoMa, Union Square, and Chinatown.
 E370141 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: San Francisco Central Subway project | Statement: [Union Square/Market Street station, isPartOfProject, San Francisco Central Subway project]
NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07 
Target entity: San Francisco Central Subway project
Context triple: [Union Square/Market Street station, isPartOfProject, San Francisco Central Subway project]
  • A. California High-Speed Rail
    California High-Speed Rail is a planned statewide high-speed train system in California designed to connect major cities like San Francisco, Los Angeles, and San Diego with fast, electrified rail service.
  • B. Transbay Tube
    The Transbay Tube is an underwater rail tunnel beneath San Francisco Bay that carries BART trains between San Francisco and Oakland.
  • C. Alameda Corridor
    The Alameda Corridor is a 20-mile freight rail expressway in Los Angeles County that consolidates and streamlines cargo movement between the region’s ports and the national rail network.
  • D. Altamont Corridor Express
    Altamont Corridor Express is a commuter rail service in Northern California that connects Central Valley communities with the San Francisco Bay Area.
  • E. Crenshaw/LAX Transit Project
    The Crenshaw/LAX Transit Project is a Los Angeles Metro rail expansion initiative designed to improve transit access along the Crenshaw Corridor and provide a key light rail connection to the Los Angeles International Airport area.
  • 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: San Francisco Central Subway project
Triple: [Union Square/Market Street station, isPartOfProject, San Francisco Central Subway project]
Generated description
The San Francisco Central Subway project is a major Muni Metro light rail extension in San Francisco designed to improve north–south transit connectivity by linking neighborhoods such as SoMa, Union Square, and Chinatown.
NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07 
Target entity: San Francisco Central Subway project
Target entity description: The San Francisco Central Subway project is a major Muni Metro light rail extension in San Francisco designed to improve north–south transit connectivity by linking neighborhoods such as SoMa, Union Square, and Chinatown.
  • A. California High-Speed Rail
    California High-Speed Rail is a planned statewide high-speed train system in California designed to connect major cities like San Francisco, Los Angeles, and San Diego with fast, electrified rail service.
  • B. Transbay Tube
    The Transbay Tube is an underwater rail tunnel beneath San Francisco Bay that carries BART trains between San Francisco and Oakland.
  • C. Alameda Corridor
    The Alameda Corridor is a 20-mile freight rail expressway in Los Angeles County that consolidates and streamlines cargo movement between the region’s ports and the national rail network.
  • D. Altamont Corridor Express
    Altamont Corridor Express is a commuter rail service in Northern California that connects Central Valley communities with the San Francisco Bay Area.
  • E. Crenshaw/LAX Transit Project
    The Crenshaw/LAX Transit Project is a Los Angeles Metro rail expansion initiative designed to improve transit access along the Crenshaw Corridor and provide a key light rail connection to the Los Angeles International Airport area.
  • 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_69ad85d5e3008190bdfe0bacdd1f5a1b completed March 8, 2026, 2:21 p.m.
NER Named-entity recognition batch_69adc0defe14819095a337a840e33300 completed March 8, 2026, 6:33 p.m.
NED1 Entity disambiguation (via context triple) batch_69b3bbc6bc948190a517639f5d79c0a3 completed March 13, 2026, 7:24 a.m.
NEDg Description generation batch_69b3bc93f93c8190a23301340b08d76b completed March 13, 2026, 7:28 a.m.
NED2 Entity disambiguation (via description) batch_69b3f8033cd481909bc0e24fd9d86831 completed March 13, 2026, 11:41 a.m.
Created at: March 8, 2026, 3:21 p.m.