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e1ced61 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 | """Deterministic executor for official CLEVR functional programs."""
from __future__ import annotations
from collections.abc import Mapping, Sequence
from typing import Any
from ..dsl.ast import Arg, AstNode, Program
from ..sources.base import World
from .base import (
AnswerValue,
ExecutionResult,
ExecutionStatus,
ExecutorError,
_InvalidReferent,
_MissingInformation,
_Trace,
literal_value,
serialize_answer,
)
NAME = "clevr_executor"
VERSION = "clevr_dsl_v1/1"
_ATTRIBUTES = frozenset({"color", "material", "shape", "size"})
_RELATIONS = frozenset({"left", "right", "front", "behind"})
class ClevrExecutor:
"""Evaluate a CLEVR AST over a normalized ``clevr_world_v1`` scene."""
name = NAME
version = VERSION
def execute(self, program: Program, *, world: World) -> ExecutionResult:
trace = _Trace()
referent_cardinality: int | None = None
status: ExecutionStatus
try:
if program.dsl != "clevr_dsl_v1" or program.compile_status != "compiled":
raise ExecutorError("executor requires a compiled clevr_dsl_v1 program")
if world.get("world_schema") != "clevr_world_v1":
raise ExecutorError(
f"clevr executor cannot read world_schema {world.get('world_schema')!r}"
)
referent_cardinality = self._check_referent(program, world, trace)
value = self._eval(program.program, world, trace)
answer = self._project_answer(program.program, value)
_steps, dependencies, trace_hash = trace.finish()
return ExecutionResult(
status="UNIQUE",
answer_value=answer,
answer_canonical=serialize_answer(
answer,
return_type=program.program.return_type,
),
dependency_node_ids=dependencies,
referent_cardinality=referent_cardinality,
trace_sha256=trace_hash,
executor_name=self.name,
executor_version=self.version,
)
except _MissingInformation:
status = "MISSING_INFORMATION"
except _InvalidReferent:
status = "INVALID_REFERENT"
except ExecutorError:
status = "ERROR"
_steps, dependencies, trace_hash = trace.finish()
return ExecutionResult(
status=status,
answer_value=None,
answer_canonical=None,
dependency_node_ids=dependencies,
referent_cardinality=(
referent_cardinality
if referent_cardinality is not None
else self._safe_referent_cardinality(program, world)
),
trace_sha256=trace_hash,
executor_name=self.name,
executor_version=self.version,
)
def execute_selector(self, selector: AstNode, *, world: World) -> tuple[str, ...]:
"""Resolve an object/object-set selector without applying ``UNIQUE``."""
trace = _Trace()
if selector.op == "UNIQUE":
if len(selector.args) != 1 or not isinstance(selector.args[0], AstNode):
raise ExecutorError("UNIQUE selector is malformed")
value = self._eval(selector.args[0], world, trace)
else:
value = self._eval(selector, world, trace)
if isinstance(value, Mapping):
node_id = value.get("id")
return (str(node_id),) if node_id else ()
if isinstance(value, tuple):
return tuple(
str(item["id"]) for item in value if isinstance(item, Mapping) and item.get("id")
)
raise ExecutorError(f"selector {selector.op!r} did not produce objects")
def _check_referent(self, program: Program, world: World, trace: _Trace) -> int | None:
selector = program.referent_selector
required = program.required_referent_cardinality
if selector is None:
return None
refs = self.execute_selector(selector, world=world)
trace.record("REFERENT", refs, len(refs))
if required is not None and len(refs) != required:
raise _InvalidReferent(
f"scalar referent cardinality {len(refs)} != required {required}"
)
return len(refs)
def _safe_referent_cardinality(self, program: Program, world: World) -> int | None:
if program.referent_selector is None:
return None
try:
return len(self.execute_selector(program.referent_selector, world=world))
except (ExecutorError, _MissingInformation, _InvalidReferent):
return None
def _eval(self, node: Arg, world: World, trace: _Trace) -> Any:
if not isinstance(node, AstNode):
raise ExecutorError(f"expected AST node, got {type(node).__name__}")
op = node.op
if op == "LITERAL":
return literal_value(node)
if op == "SCENE":
objects = _objects(world)
trace.record("SCENE", (), len(objects))
return objects
if op.startswith("FILTER_"):
return self._filter(op.removeprefix("FILTER_").lower(), node, world, trace)
if op == "UNIQUE":
unique_values = _object_set(self._eval_arg(node, 0, world, trace), op)
trace.record(op, unique_values, len(unique_values))
if len(unique_values) != 1:
raise _InvalidReferent(f"UNIQUE received {len(unique_values)} objects")
return unique_values[0]
if op == "RELATE":
source = _object(self._eval_arg(node, 0, world, trace), op)
relation = _string(self._eval_arg(node, 1, world, trace), op)
related_values = _related(world, str(source["id"]), relation)
trace.record(op, (source, *related_values), len(related_values))
return related_values
if op.startswith("SAME_"):
attribute = op.removeprefix("SAME_").lower()
source = _object(self._eval_arg(node, 0, world, trace), op)
target = _attribute(source, attribute)
same_values: list[Mapping[str, Any]] = []
for candidate in _objects(world):
if candidate.get("id") == source.get("id"):
continue
if _attribute(candidate, attribute) == target:
same_values.append(candidate)
same_result = _ordered(same_values)
trace.record(op, (source, *same_result), len(same_result))
return same_result
if op in {"UNION", "INTERSECT"}:
left = _object_set(self._eval_arg(node, 0, world, trace), op)
right = _object_set(self._eval_arg(node, 1, world, trace), op)
left_by_id = {str(item["id"]): item for item in left}
right_by_id = {str(item["id"]): item for item in right}
ids = (
set(left_by_id).union(right_by_id)
if op == "UNION"
else set(left_by_id).intersection(right_by_id)
)
set_result = tuple((left_by_id | right_by_id)[node_id] for node_id in sorted(ids))
trace.record(op, set_result, len(set_result))
return set_result
if op == "COUNT":
count_values = _object_set(self._eval_arg(node, 0, world, trace), op)
trace.record(op, count_values, len(count_values))
return len(count_values)
if op == "EXIST":
exist_values = _object_set(self._eval_arg(node, 0, world, trace), op)
exists = bool(exist_values)
trace.record(op, exist_values, exists)
return exists
if op.startswith("QUERY_"):
attribute = op.removeprefix("QUERY_").lower()
obj = _object(self._eval_arg(node, 0, world, trace), op)
value = _attribute(obj, attribute)
trace.record(op, obj, value)
return value
if op.startswith("EQUAL_"):
left = self._eval_arg(node, 0, world, trace)
right = self._eval_arg(node, 1, world, trace)
comparison = _comparable(left) == _comparable(right)
trace.record(op, (), comparison)
return comparison
if op in {"LESS_THAN", "GREATER_THAN"}:
left_integer = _integer(self._eval_arg(node, 0, world, trace), op)
right_integer = _integer(self._eval_arg(node, 1, world, trace), op)
comparison = (
left_integer < right_integer if op == "LESS_THAN" else left_integer > right_integer
)
trace.record(op, (), comparison)
return comparison
raise ExecutorError(f"unsupported CLEVR op {op!r}")
def _eval_arg(
self,
node: AstNode,
position: int,
world: World,
trace: _Trace,
) -> Any:
try:
arg = node.args[position]
except IndexError as exc:
raise ExecutorError(f"{node.op} has no operand {position}") from exc
if not isinstance(arg, AstNode):
raise ExecutorError(f"{node.op} operand {position} is not an AST node")
return self._eval(arg, world, trace)
def _filter(
self,
attribute: str,
node: AstNode,
world: World,
trace: _Trace,
) -> tuple[Mapping[str, Any], ...]:
values = _object_set(self._eval_arg(node, 0, world, trace), node.op)
wanted = _string(self._eval_arg(node, 1, world, trace), node.op)
selected = tuple(item for item in values if _attribute(item, attribute) == wanted)
trace.record(node.op, selected, len(selected))
return selected
def _project_answer(self, root: AstNode, value: Any) -> AnswerValue:
if root.return_type == "integer":
return _integer(value, root.op)
if root.return_type == "boolean":
return bool(value)
if root.return_type == "string":
return _string(value, root.op)
raise ExecutorError(
f"CLEVR root {root.op!r} has non-answer return type {root.return_type!r}"
)
def _objects(world: World) -> tuple[Mapping[str, Any], ...]:
raw = world.get("objects")
if not isinstance(raw, list):
raise ExecutorError("CLEVR world objects is not an array")
values: list[Mapping[str, Any]] = []
seen: set[str] = set()
for item in raw:
if not isinstance(item, Mapping) or not item.get("id"):
raise ExecutorError("CLEVR world contains an object without an id")
node_id = str(item["id"])
if node_id in seen:
raise ExecutorError(f"CLEVR world has duplicate object id {node_id!r}")
seen.add(node_id)
values.append(item)
return _ordered(values)
def _ordered(values: Sequence[Mapping[str, Any]]) -> tuple[Mapping[str, Any], ...]:
return tuple(sorted(values, key=lambda item: str(item.get("id", ""))))
def _object_set(value: Any, op: str) -> tuple[Mapping[str, Any], ...]:
if not isinstance(value, tuple) or any(not isinstance(item, Mapping) for item in value):
raise ExecutorError(f"{op} expected an object set")
return _ordered(value)
def _object(value: Any, op: str) -> Mapping[str, Any]:
if not isinstance(value, Mapping) or not value.get("id"):
raise ExecutorError(f"{op} expected one object")
return value
def _attribute(obj: Mapping[str, Any], attribute: str) -> str:
if attribute not in _ATTRIBUTES:
raise ExecutorError(f"unknown CLEVR attribute {attribute!r}")
value = obj.get(attribute)
if value is None:
raise _MissingInformation(f"object {obj.get('id')} {attribute} is hidden")
if not isinstance(value, str) or not value:
raise ExecutorError(f"object {obj.get('id')} has invalid {attribute}")
return value
def _related(
world: World,
source_id: str,
relation: str,
) -> tuple[Mapping[str, Any], ...]:
if relation not in _RELATIONS:
raise ExecutorError(f"unknown CLEVR relation {relation!r}")
relationships = world.get("relationships")
if not isinstance(relationships, Mapping):
raise ExecutorError("CLEVR relationships is not an object")
relation_map = relationships.get(relation)
if not isinstance(relation_map, Mapping):
raise ExecutorError(f"CLEVR relationship {relation!r} is missing")
raw_targets = relation_map.get(source_id, [])
if not isinstance(raw_targets, list):
raise ExecutorError(f"CLEVR relationship {relation!r}/{source_id!r} is malformed")
by_id = {str(item["id"]): item for item in _objects(world)}
targets: list[Mapping[str, Any]] = []
for node_id in raw_targets:
target = by_id.get(str(node_id))
if target is None:
raise ExecutorError(
f"CLEVR relationship {relation!r} references absent object {node_id!r}"
)
targets.append(target)
return _ordered(targets)
def _string(value: Any, op: str) -> str:
if not isinstance(value, str):
raise ExecutorError(f"{op} expected a string, got {type(value).__name__}")
return value
def _integer(value: Any, op: str) -> int:
if isinstance(value, bool) or not isinstance(value, int):
raise ExecutorError(f"{op} expected an integer, got {type(value).__name__}")
return int(value)
def _comparable(value: Any) -> Any:
if isinstance(value, Mapping):
node_id = value.get("id")
if not node_id:
raise ExecutorError("object comparison received an object without an id")
return ("object", str(node_id))
if isinstance(value, (str, int, bool)):
return value
raise ExecutorError(f"value {value!r} is not comparable")
__all__ = ["ClevrExecutor"]
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