BIM-Edit/BIM-Edit-Tasks

BIM-Edit Tasks

324 natural-language building model editing tasks over IFC (Industry Foundation Classes) models. Each task pairs an input IFC file with a ground-truth IFC file and a natural-language instruction describing the edit that turns one into the other. The benchmark measures whether an agent can translate a spoken-language design instruction into a correct geometric and semantic change to a building model.

Composition

The 324 tasks are fully balanced across three axes.

Axis	Values	Count each
Operation	create, update, delete	108
Category	direct, spatial, topological	108
Scene	realistic (scene:R), artificial (scene:A)	162

Element types covered:

IFC class	Tasks
IfcWall	72
IfcSlab	72
IfcSpace	72
IfcDoor	36
IfcWindow	36
IfcColumn	36

The tasks draw on 88 distinct input models and 98 distinct ground-truth models.

Categories

• direct: the instruction states the edit explicitly, including coordinates, dimensions and the identifiers of the elements to connect to. No inference about the surrounding model is needed beyond locating the named entities.
• spatial: the target is described relative to other geometry ("0.9m away in -y direction from the stairway"). The agent must first locate the reference element and then derive the placement.
• topological: the instruction is phrased in terms of relationships (containment, bounding, connectivity, openings) rather than coordinates.

Scenes

• realistic (data/realistic): models derived from real building projects, with the geometric irregularity, redundant entities and inconsistent property sets that come with them.
• artificial (data/artificial): synthetic models built to isolate a single edit, with clean and predictable structure.

Fields

Each line of tasks.jsonl is one task object.

Field	Type	Description
task_id	string	Unique identifier, see the format below.
operation	string	One of create, update, delete.
category	string	One of direct, spatial, topological.
input_ifc	string	Relative path to the IFC model handed to the agent.
ground_truth_ifc	string	Relative path to the reference IFC model after the edit.
prompt	string	The natural-language instruction.
target	object	{"entity_type": <IFC class>, "guids": [<GlobalId>, ...]}.
evaluation	object	Per-task scoring overrides. Empty for every task in this release, meaning all tasks use the default evaluator settings.
tags	list[string]	Operation, IFC class, scene:R or scene:A, category, and anchored or no_anchor.

target

entity_type is the IFC class of the element being edited and is used to filter candidate matches during scoring. guids lists the GlobalIds of the affected elements in the ground-truth model. It is populated for all 108 update and all 108 delete tasks and is empty for the 108 create tasks, where the created element does not exist in the input model and is instead recovered from the delta between input_ifc and ground_truth_ifc.

anchored vs no_anchor

216 tasks are anchored: the prompt refers to at least one existing element that fixes the edit in place. 108 are no_anchor, giving absolute coordinates instead. This tag separates tasks that test model comprehension from those that test instruction following alone.

task_id format

<ELEMENT>-<OPERATION>-<CATEGORY>-<SCENE>-<INDEX>, for example WAL-CRE-DIR-R-001.

Segment	Values
Element	WAL wall, DOR door, WIN window, SLB slab, ROM space, COL column
Operation	CRE create, UPD update, DEL delete
Category	DIR direct, SPA spatial, TOP topological
Scene	R realistic, A artificial
Index	Zero-padded counter within the group

Example

{
  "task_id": "WAL-CRE-DIR-R-001",
  "operation": "create",
  "category": "direct",
  "input_ifc": "data/realistic/0e29802b440f-input-create_wall.ifc",
  "ground_truth_ifc": "data/realistic/0e29802b440f.ifc",
  "prompt": "Create a wall with a length of 2.62m from (x1,y1,z1) = (7.180, 14.140, 3.000) to (x2,y2,z2) = (9.800, 14.140, 3.000) with a thickness of 0.240m in -y direction and a height of 3m. Make sure that the wall is added to the building storey with id 1jPCssxb5C1RSM_YHIx$zl, connected to walls 30a7nM35T5pgZzaItbPb1u and 153QDldl9AdhGy6O1dePed, and bounds the spaces 19QUlaWcT26g1KZHffEeW9 and 19QUlaWcT26g1KZHffEeWz.",
  "target": {"entity_type": "IfcWall", "guids": []},
  "evaluation": {},
  "tags": ["create", "IfcWall", "scene:R", "direct", "no_anchor"]
}

Loading

from datasets import load_dataset

ds = load_dataset("BIM-Edit/BIM-Edit-Tasks", split="train")
print(len(ds))              # 324
print(ds[0]["prompt"])

walls = ds.filter(lambda r: r["target"]["entity_type"] == "IfcWall")
topological = ds.filter(lambda r: r["category"] == "topological")

Or read it directly, since it is a single JSONL file:

import json

with open("tasks.jsonl", encoding="utf-8") as f:
    tasks = [json.loads(line) for line in f]