File size: 1,769 Bytes
6aa6c12 | 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 | """Fixed-action harness diagnostic; never a participant model or scored baseline."""
from __future__ import annotations
from typing import Mapping, Sequence
from benchkit.contracts import (
ActionChunk, ActionSpec, EpisodeContext, JsonValue, Observation, ObservationSpec,
PolicyDecision, PolicyDescriptor,
)
from benchkit.registry import register_policy
class ConstantPolicy:
def __init__(self, action: Sequence[float], chunk_length: int = 5) -> None:
if type(chunk_length) is not int or not 1 <= chunk_length <= 1024:
raise ValueError("chunk_length must be an integer in [1, 1024]")
self.chunk = ActionChunk.from_steps([action] * chunk_length)
self.descriptor = PolicyDescriptor(
name="constant-action-diagnostic", kind="scripted", version="1",
parameters={"action": list(self.chunk.steps[0]), "chunk_length": chunk_length,
"purpose": "infrastructure_validation_only"},
)
def compatibility_errors(self, observation_spec: ObservationSpec, action_spec: ActionSpec) -> Sequence[str]:
try:
action_spec.validate(self.chunk.steps[0])
except (ValueError, TypeError) as exc:
return [str(exc)]
return []
def start_episode(self, context: EpisodeContext) -> None:
pass
def act(self, observation: Observation) -> PolicyDecision:
return PolicyDecision(action=self.chunk)
def end_episode(self) -> None:
pass
@register_policy("constant")
def make_constant(parameters: Mapping[str, JsonValue]) -> ConstantPolicy:
if set(parameters) - {"action", "chunk_length"}:
raise ValueError("constant supports only action and chunk_length")
return ConstantPolicy(**parameters)
|