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from __future__ import annotations
from openhands.core.config.condenser_config import ObservationMaskingCondenserConfig
from openhands.events.event import Event
from openhands.events.observation import Observation
from openhands.events.observation.agent import AgentCondensationObservation
from openhands.memory.condenser.condenser import Condensation, Condenser, View
class ObservationMaskingCondenser(Condenser):
"""A condenser that masks the values of observations outside of a recent attention window."""
def __init__(self, attention_window: int = 5):
self.attention_window = attention_window
super().__init__()
def condense(self, view: View) -> View | Condensation:
"""Replace the content of observations outside of the attention window with a placeholder."""
results: list[Event] = []
for i, event in enumerate(view):
if isinstance(event, Observation) and i < len(view) - self.attention_window:
results.append(AgentCondensationObservation('<MASKED>'))
else:
results.append(event)
return View(events=results)
@classmethod
def from_config(
cls, config: ObservationMaskingCondenserConfig
) -> ObservationMaskingCondenser:
return ObservationMaskingCondenser(**config.model_dump(exclude=['type']))
ObservationMaskingCondenser.register_config(ObservationMaskingCondenserConfig)
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