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README.md

@@ -1,3 +1,116 @@
----
-license: mit
----
+---
+language:
+  - en
+tags:
+  - structural-engineering
+  - truss-optimization
+  - reinforcement-learning
+  - reasoning
+  - design-benchmark
+license: mit
+---
+
+# DesignBench-Truss
+
+## Overview
+
+DesignBench-Truss is the benchmark split (problems 090–099) of DesignBench, a
+dataset for teaching and evaluating large language models on iterative
+structural engineering design via Tree-of-Thought reasoning.
+
+Each problem requires minimising the mass of a 2-D pin-jointed truss structure
+while satisfying structural safety constraints (factor of safety ≥ 1.5 for both
+buckling and yielding failure modes). A finite-element analysis oracle
+(trussme) provides deterministic feedback after every design modification.
+
+## Task Description
+
+Given an initial truss design with known joint positions, member cross-sections,
+material properties, and loading conditions, a model must produce a sequence of
+discrete grammar actions that transform the design into a feasible,
+mass-minimised structure.
+
+### Grammar Actions
+
+| Action | Signature | Description |
+|--------|-----------|-------------|
+| SCALE_PARAM | `SCALE_PARAM(member_id_or_all, param, factor)` | Scale one parameter of one (or all) members |
+| SCALE_MULTI_PARAM | `SCALE_MULTI_PARAM([member_ids], [param:factor, ...])` | Scale multiple parameters simultaneously |
+| ADD_MEMBER | `ADD_MEMBER(joint1, joint2, material, shape_type, r, t)` | Add a new pipe member between two joints |
+
+## Data Format
+
+### `benchmark.json`
+
+Flat list of examples — one per gold trace — with the following fields:
+
+```json
+{
+  "problem_id": "auto_problem_090",
+  "trace_id": "auto_problem_090_trace_0",
+  "problem_text": "PROBLEM: Truss optimization ...",
+  "initial_state": {
+    "mass": 142.5,
+    "fos_buckling": 0.31,
+    "fos_yielding": 1.09,
+    "deflection": 0.038,
+    "is_feasible": false
+  },
+  "gold_action_sequence": [
+    "ADD_MEMBER(5, 6, 6061_T6_Aluminum, Pipe, 0.0497, 0.0056)",
+    "SCALE_PARAM(all_members, thickness, 1.28)"
+  ],
+  "reaches_solution": true,
+  "trace_quality": 0.98
+}
+```
+
+### `problems/`
+
+Raw problem JSON files containing joint positions, member topology, loads, and
+design constraints.
+
+### `trees/`
+
+Full modification trees as JSON. Each tree contains all explored design states
+(nodes) and the grammar actions connecting them (edges).
+
+### `traces/`
+
+Serialized gold traces — lists of node-sequences extracted from each tree.
+
+## Metrics
+
+| Metric | Description |
+|--------|-------------|
+| feasibility_rate | Fraction of episodes reaching `is_feasible=True` |
+| mass_reduction | `(initial_mass - final_mass) / initial_mass` |
+| grammar_validity_rate | Fraction of steps with parseable grammar actions |
+| avg_steps_to_feasibility | Mean episode length when a feasible design is found |
+| overall_score | Weighted composite: design_correctness (0.5) + structural_validity (0.25) + reasoning_quality (0.15) + grammar_compliance (0.10) |
+
+## Example Usage
+
+```python
+import json
+
+with open("benchmark.json") as f:
+    examples = json.load(f)
+
+print(f"Loaded {len(examples)} benchmark examples")
+
+for ex in examples[:3]:
+    print(ex["problem_id"], "->", ex["reaches_solution"],
+          "actions:", len(ex["gold_action_sequence"]))
+```
+
+## Citation
+
+```bibtex
+@misc{designbench2025,
+  title  = {DesignBench: A Benchmark for Iterative Structural Engineering Design},
+  author = {DesignBench Authors},
+  year   = {2025},
+  note   = {https://huggingface.co/datasets/DesignBench-Truss}
+}
+```

dataset_info.json

@@ -0,0 +1,26 @@
+{
+  "dataset_name": "DesignBench-Truss",
+  "version": "1.0",
+  "description": "DesignBench is a benchmark for evaluating LLM capabilities in iterative structural engineering design. The truss domain uses finite element analysis (FEA) via trussme as the reward oracle. Each problem asks a model to minimize truss mass while satisfying buckling and yielding factor-of-safety constraints.",
+  "num_problems": 10,
+  "num_examples": 5000,
+  "splits": {
+    "benchmark": {
+      "num_problems": 10,
+      "num_examples": 5000,
+      "purpose": "HuggingFace public benchmark — NEVER used for training"
+    }
+  },
+  "grammar_actions": [
+    "SCALE_PARAM",
+    "SCALE_MULTI_PARAM",
+    "ADD_MEMBER"
+  ],
+  "metrics": {
+    "feasibility_rate": "fraction of episodes reaching is_feasible=True",
+    "mass_reduction": "(initial_mass - final_mass) / initial_mass",
+    "grammar_validity_rate": "fraction of steps with parseable grammar actions",
+    "avg_steps_to_feasibility": "mean episode length when feasible",
+    "overall_score": "weighted composite of design_correctness(0.5) + structural_validity(0.25) + reasoning_quality(0.15) + grammar_compliance(0.10)"
+  }
+}

problems/auto_problem_090.json

@@ -0,0 +1,367 @@
+{
+  "problem_id": "auto_problem_090",
+  "description": "Truss optimization problem (ground structure variant 90)",
+  "topology": {
+    "joints": [
+      {
+        "id": 0,
+        "position": [
+          0.0,
+          0.0,
+          0.0
+        ],
+        "support": "pinned"
+      },
+      {
+        "id": 1,
+        "position": [
+          3.19918854614327,
+          0.0,
+          0.0
+        ],
+        "support": null
+      },
+      {
+        "id": 2,
+        "position": [
+          6.39837709228654,
+          0.0,
+          0.0
+        ],
+        "support": null
+      },
+      {
+        "id": 3,
+        "position": [
+          9.59756563842981,
+          0.0,
+          0.0
+        ],
+        "support": null
+      },
+      {
+        "id": 4,
+        "position": [
+          12.79675418457308,
+          0.0,
+          0.0
+        ],
+        "support": "roller_y"
+      },
+      {
+        "id": 5,
+        "position": [
+          0.0,
+          1.9231548924019264,
+          0.0
+        ],
+        "support": null
+      },
+      {
+        "id": 6,
+        "position": [
+          3.19918854614327,
+          1.9231548924019264,
+          0.0
+        ],
+        "support": null
+      },
+      {
+        "id": 7,
+        "position": [
+          6.39837709228654,
+          1.9231548924019264,
+          0.0
+        ],
+        "support": null
+      },
+      {
+        "id": 8,
+        "position": [
+          9.59756563842981,
+          1.9231548924019264,
+          0.0
+        ],
+        "support": null
+      },
+      {
+        "id": 9,
+        "position": [
+          12.79675418457308,
+          1.9231548924019264,
+          0.0
+        ],
+        "support": null
+      }
+    ],
+    "members": [
+      {
+        "joints": [
+          0,
+          1
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.03210756736432178,
+          "t": 0.0045368020938040664
+        }
+      },
+      {
+        "joints": [
+          1,
+          2
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.03789508587075107,
+          "t": 0.005354578968020797
+        }
+      },
+      {
+        "joints": [
+          2,
+          3
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.04394768892003109,
+          "t": 0.006209812311467789
+        }
+      },
+      {
+        "joints": [
+          3,
+          4
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.041388472287309575,
+          "t": 0.005848194776072347
+        }
+      },
+      {
+        "joints": [
+          6,
+          7
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.038807986380916426,
+          "t": 0.005483571890435567
+        }
+      },
+      {
+        "joints": [
+          7,
+          8
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.04279471519270644,
+          "t": 0.006046897022343766
+        }
+      },
+      {
+        "joints": [
+          0,
+          5
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.03418407949872234,
+          "t": 0.0048302134411123765
+        }
+      },
+      {
+        "joints": [
+          1,
+          6
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.015033216228572453,
+          "t": 0.0014532957324798897
+        }
+      },
+      {
+        "joints": [
+          2,
+          7
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.011985015441328307,
+          "t": 0.0013363023222982382
+        }
+      },
+      {
+        "joints": [
+          3,
+          8
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.024999142505075934,
+          "t": 0.003532381035704492
+        }
+      },
+      {
+        "joints": [
+          4,
+          9
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.03223157917330818,
+          "t": 0.004554324973325953
+        }
+      },
+      {
+        "joints": [
+          0,
+          6
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.036001542756706396,
+          "t": 0.005087021159388675
+        }
+      },
+      {
+        "joints": [
+          1,
+          5
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.028360226562473775,
+          "t": 0.004007302508765025
+        }
+      },
+      {
+        "joints": [
+          1,
+          7
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.03136238489947134,
+          "t": 0.004431507745950225
+        }
+      },
+      {
+        "joints": [
+          2,
+          6
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.03374258742611947,
+          "t": 0.0039415917419294245
+        }
+      },
+      {
+        "joints": [
+          2,
+          8
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.034368169918652054,
+          "t": 0.004856225433647022
+        }
+      },
+      {
+        "joints": [
+          3,
+          9
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.0378835698151496,
+          "t": 0.005352951748350982
+        }
+      },
+      {
+        "joints": [
+          4,
+          8
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.046420663407805464,
+          "t": 0.006559243824193539
+        }
+      }
+    ]
+  },
+  "loading": [
+    {
+      "joint": 8,
+      "force": [
+        0.0,
+        -56923.13142119463,
+        0.0
+      ]
+    },
+    {
+      "joint": 5,
+      "force": [
+        0.0,
+        -59918.61021454255,
+        0.0
+      ]
+    },
+    {
+      "joint": 9,
+      "force": [
+        0.0,
+        -37114.337555489576,
+        0.0
+      ]
+    }
+  ],
+  "goals": {
+    "minimum_fos_buckling": 1.5,
+    "minimum_fos_yielding": 1.5,
+    "maximum_mass": 225.1706843512172
+  },
+  "optimization": {
+    "shape": "Pipe",
+    "shape_params": {
+      "r": {
+        "min": 0.005,
+        "max": 0.15,
+        "initial": 0.03
+      },
+      "t": {
+        "min": 0.001,
+        "max": 0.02,
+        "initial": 0.005
+      }
+    }
+  },
+  "_metadata": {
+    "optimal_mass": 204.70062213747016,
+    "generation_method": "ground_structure_lp",
+    "degradation_steps": 7
+  }
+}

problems/auto_problem_091.json

@@ -0,0 +1,223 @@
+{
+  "problem_id": "auto_problem_091",
+  "description": "Truss optimization problem (ground structure variant 91)",
+  "topology": {
+    "joints": [
+      {
+        "id": 0,
+        "position": [
+          0.0,
+          0.0,
+          0.0
+        ],
+        "support": "pinned"
+      },
+      {
+        "id": 1,
+        "position": [
+          4.993451819830561,
+          0.0,
+          0.0
+        ],
+        "support": null
+      },
+      {
+        "id": 2,
+        "position": [
+          9.986903639661122,
+          0.0,
+          0.0
+        ],
+        "support": "roller_y"
+      },
+      {
+        "id": 3,
+        "position": [
+          0.0,
+          1.7820207127142014,
+          0.0
+        ],
+        "support": null
+      },
+      {
+        "id": 4,
+        "position": [
+          4.993451819830561,
+          1.7820207127142014,
+          0.0
+        ],
+        "support": null
+      },
+      {
+        "id": 5,
+        "position": [
+          9.986903639661122,
+          1.7820207127142014,
+          0.0
+        ],
+        "support": null
+      }
+    ],
+    "members": [
+      {
+        "joints": [
+          0,
+          1
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.0464547513736561,
+          "t": 0.006830914661562028
+        }
+      },
+      {
+        "joints": [
+          1,
+          2
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.04672828451035966,
+          "t": 0.006871136198836063
+        }
+      },
+      {
+        "joints": [
+          3,
+          4
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.04131363011640812,
+          "t": 0.0060749411704861785
+        }
+      },
+      {
+        "joints": [
+          0,
+          3
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.03076743351432259,
+          "t": 0.00452418119733616
+        }
+      },
+      {
+        "joints": [
+          1,
+          4
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.02272298962918612,
+          "t": 0.0033412901462766616
+        }
+      },
+      {
+        "joints": [
+          2,
+          5
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.032998918251711036,
+          "t": 0.003282815190527744
+        }
+      },
+      {
+        "joints": [
+          0,
+          4
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.048553012336187036,
+          "t": 0.0071394523492884976
+        }
+      },
+      {
+        "joints": [
+          1,
+          3
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.043175505923539644,
+          "t": 0.006348719726454399
+        }
+      },
+      {
+        "joints": [
+          1,
+          5
+        ],
+        "material": "6061_T6_Aluminum",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.04275366582562223,
+          "t": 0.006286690469500224
+        }
+      }
+    ]
+  },
+  "loading": [
+    {
+      "joint": 3,
+      "force": [
+        0.0,
+        -39884.373382388105,
+        0.0
+      ]
+    },
+    {
+      "joint": 4,
+      "force": [
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+    {
+      "joint": 5,
+      "force": [
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+        0.0
+      ]
+    }
+  ],
+  "goals": {
+    "minimum_fos_buckling": 1.5,
+    "minimum_fos_yielding": 1.5,
+    "maximum_mass": 250.39413660823678
+  },
+  "optimization": {
+    "shape": "Pipe",
+    "shape_params": {
+      "r": {
+        "min": 0.005,
+        "max": 0.15,
+        "initial": 0.03
+      },
+      "t": {
+        "min": 0.001,
+        "max": 0.02,
+        "initial": 0.005
+      }
+    }
+  },
+  "_metadata": {
+    "optimal_mass": 227.63103328021523,
+    "generation_method": "ground_structure_lp",
+    "degradation_steps": 4
+  }
+}

problems/auto_problem_092.json

@@ -0,0 +1,273 @@
+{
+  "problem_id": "auto_problem_092",
+  "description": "Truss optimization problem (ground structure variant 92)",
+  "topology": {
+    "joints": [
+      {
+        "id": 0,
+        "position": [
+          0.0,
+          0.0,
+          0.0
+        ],
+        "support": "pinned"
+      },
+      {
+        "id": 1,
+        "position": [
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+          0.0
+        ],
+        "support": null
+      },
+      {
+        "id": 2,
+        "position": [
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+          0.0,
+          0.0
+        ],
+        "support": null
+      },
+      {
+        "id": 3,
+        "position": [
+          7.276534845590437,
+          0.0,
+          0.0
+        ],
+        "support": "roller_y"
+      },
+      {
+        "id": 4,
+        "position": [
+          0.0,
+          3.592234099139299,
+          0.0
+        ],
+        "support": null
+      },
+      {
+        "id": 5,
+        "position": [
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+          3.592234099139299,
+          0.0
+        ],
+        "support": null
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+      {
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+        "position": [
+          4.851023230393625,
+          3.592234099139299,
+          0.0
+        ],
+        "support": null
+      },
+      {
+        "id": 7,
+        "position": [
+          7.276534845590437,
+          3.592234099139299,
+          0.0
+        ],
+        "support": null
+      }
+    ],
+    "members": [
+      {
+        "joints": [
+          0,
+          1
+        ],
+        "material": "A36_Steel",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.020879239660943894,
+          "t": 0.0030726155346458496
+        }
+      },
+      {
+        "joints": [
+          1,
+          2
+        ],
+        "material": "A36_Steel",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.02097612691712676,
+          "t": 0.0030868735868206892
+        }
+      },
+      {
+        "joints": [
+          2,
+          3
+        ],
+        "material": "A36_Steel",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.01618179011699016,
+          "t": 0.002381332869359618
+        }
+      },
+      {
+        "joints": [
+          4,
+          5
+        ],
+        "material": "A36_Steel",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.0144772538686604,
+          "t": 0.002130491141354461
+        }
+      },
+      {
+        "joints": [
+          6,
+          7
+        ],
+        "material": "A36_Steel",
+        "shape": {
+          "type": "Pipe",
+          "r": 0.015069577420492995,
+          "t": 0.0022176582305996617
+        }
+      },
+      {
+        "joints": [
+          0,
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+}

problems/auto_problem_093.json

@@ -0,0 +1,219 @@
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problems/auto_problem_094.json

@@ -0,0 +1,301 @@
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problems/auto_problem_095.json

@@ -0,0 +1,309 @@
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+}

problems/auto_problem_096.json

@@ -0,0 +1,359 @@
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+}

problems/auto_problem_097.json

@@ -0,0 +1,223 @@
+{
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+  "description": "Truss optimization problem (ground structure variant 97)",
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+}

problems/auto_problem_098.json

@@ -0,0 +1,235 @@
+{
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+}

problems/auto_problem_099.json

@@ -0,0 +1,317 @@
+{
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+  "description": "Truss optimization problem (ground structure variant 99)",
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