Triple
T3753493
| Position | Surface form | Disambiguated ID | Type / Status |
|---|---|---|---|
| Subject | MBTA Mattapan High-Speed Line |
E81387
|
entity |
| Predicate | depot |
P14646
|
FINISHED |
| Object |
Mattapan yard
Mattapan Yard is the maintenance and storage facility serving the MBTA’s Mattapan High-Speed Line in Boston, Massachusetts.
|
E385500
|
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: Mattapan yard | Statement: [MBTA Mattapan High-Speed Line, depot, Mattapan yard]
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Mattapan yard Context triple: [MBTA Mattapan High-Speed Line, depot, Mattapan yard]
-
A.
Mattapan
Mattapan is a residential neighborhood in Boston, Massachusetts, known for its diverse community and location in the city's southern section.
-
B.
Watertown Yard
Watertown Yard is a Massachusetts Bay Transportation Authority bus facility and former streetcar yard in Watertown, Massachusetts, serving as a key layover and terminal point for several bus routes.
-
C.
Mosholu Yard
Mosholu Yard is a New York City Subway maintenance and storage facility in the Bronx serving trains on the IRT Jerome Avenue Line.
-
D.
Moakley Park
Moakley Park is a large public recreation area in South Boston known for its athletic fields, waterfront location, and community events.
-
E.
Watertown Square
Watertown Square is a major transit and commercial hub in Watertown, Massachusetts, functioning as a key connection point for multiple MBTA bus routes and local activity.
- 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: Mattapan yard Triple: [MBTA Mattapan High-Speed Line, depot, Mattapan yard]
Generated description
Mattapan Yard is the maintenance and storage facility serving the MBTA’s Mattapan High-Speed Line in Boston, Massachusetts.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Mattapan yard Target entity description: Mattapan Yard is the maintenance and storage facility serving the MBTA’s Mattapan High-Speed Line in Boston, Massachusetts.
-
A.
Mattapan
Mattapan is a residential neighborhood in Boston, Massachusetts, known for its diverse community and location in the city's southern section.
-
B.
Watertown Yard
Watertown Yard is a Massachusetts Bay Transportation Authority bus facility and former streetcar yard in Watertown, Massachusetts, serving as a key layover and terminal point for several bus routes.
-
C.
Mosholu Yard
Mosholu Yard is a New York City Subway maintenance and storage facility in the Bronx serving trains on the IRT Jerome Avenue Line.
-
D.
Moakley Park
Moakley Park is a large public recreation area in South Boston known for its athletic fields, waterfront location, and community events.
-
E.
Watertown Square
Watertown Square is a major transit and commercial hub in Watertown, Massachusetts, functioning as a key connection point for multiple MBTA bus routes and local activity.
- 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_69ad8b19b7b08190a6188804e99c53e9 |
completed | March 8, 2026, 2:43 p.m. |
| NER | Named-entity recognition | batch_69adcb9340e0819083215989718b4598 |
completed | March 8, 2026, 7:18 p.m. |
| NED1 | Entity disambiguation (via context triple) | batch_69b4e5044f3c8190969828966b37e729 |
completed | March 14, 2026, 4:33 a.m. |
| NEDg | Description generation | batch_69b4e587f8588190bf3a1c744433619b |
completed | March 14, 2026, 4:35 a.m. |
| NED2 | Entity disambiguation (via description) | batch_69b4e61dc8bc81909b683e54cd4ca2f6 |
completed | March 14, 2026, 4:37 a.m. |
Created at: March 8, 2026, 3:35 p.m.