# ============================================================ # Module: Memory Decay Engine (decay_engine.py) # 模块：记忆衰减引擎 # # Simulates human forgetting curve; auto-decays inactive memories and archives them. # 模拟人类遗忘曲线，自动衰减不活跃记忆并归档。 # # Core formula (improved Ebbinghaus + emotion coordinates): # 核心公式（改进版艾宾浩斯遗忘曲线 + 情感坐标）： # Score = Importance × (activation_count^0.3) × e^(-λ×days) × emotion_weight # # Emotion weight (continuous coordinate, not discrete labels): # 情感权重（基于连续坐标而非离散列举）： # emotion_weight = base + (arousal × arousal_boost) # Higher arousal → higher emotion weight → slower decay # 唤醒度越高 → 情感权重越大 → 记忆衰减越慢 # # Depended on by: server.py # 被谁依赖：server.py # ============================================================ import math import asyncio import logging from datetime import datetime logger = logging.getLogger("ombre_brain.decay") class DecayEngine: """ Memory decay engine — periodically scans all dynamic buckets, calculates decay scores, auto-archives low-activity buckets to simulate natural forgetting. 记忆衰减引擎 —— 定期扫描所有动态桶， 计算衰减得分，将低活跃桶自动归档，模拟自然遗忘。 """ def __init__(self, config: dict, bucket_mgr): # --- Load decay parameters / 加载衰减参数 --- decay_cfg = config.get("decay", {}) self.decay_lambda = decay_cfg.get("lambda", 0.05) self.threshold = decay_cfg.get("threshold", 0.3) self.check_interval = decay_cfg.get("check_interval_hours", 24) # --- Emotion weight params (continuous arousal coordinate) --- # --- 情感权重参数（基于连续 arousal 坐标）--- emotion_cfg = decay_cfg.get("emotion_weights", {}) self.emotion_base = emotion_cfg.get("base", 1.0) self.arousal_boost = emotion_cfg.get("arousal_boost", 0.8) self.bucket_mgr = bucket_mgr # --- Background task control / 后台任务控制 --- self._task: asyncio.Task | None = None self._running = False @property def is_running(self) -> bool: """Whether the decay engine is running in the background. 衰减引擎是否正在后台运行。""" return self._running # --------------------------------------------------------- # Core: calculate decay score for a single bucket # 核心：计算单个桶的衰减得分 # # Higher score = more vivid memory; below threshold → archive # 得分越高 = 记忆越鲜活，低于阈值则归档 # Permanent buckets never decay / 固化桶永远不衰减 # --------------------------------------------------------- def calculate_score(self, metadata: dict) -> float: """ Calculate current activity score for a memory bucket. 计算一个记忆桶的当前活跃度得分。 Formula: Score = Importance × (act_count^0.3) × e^(-λ×days) × (base + arousal×boost) """ if not isinstance(metadata, dict): return 0.0 # --- Permanent buckets never decay / 固化桶永不衰减 --- if metadata.get("type") == "permanent": return 999.0 importance = max(1, min(10, int(metadata.get("importance", 5)))) activation_count = max(1, int(metadata.get("activation_count", 1))) # --- Days since last activation / 距离上次激活过了多少天 --- last_active_str = metadata.get("last_active", metadata.get("created", "")) try: last_active = datetime.fromisoformat(str(last_active_str)) days_since = max(0.0, (datetime.now() - last_active).total_seconds() / 86400) except (ValueError, TypeError): days_since = 30 # Parse failure → assume 30 days / 解析失败假设已过 30 天 # --- Emotion weight: continuous arousal coordinate --- # --- 情感权重：基于连续 arousal 坐标计算 --- # Higher arousal → stronger emotion → higher weight → slower decay # arousal 越高 → 情感越强烈 → 权重越大 → 衰减越慢 try: arousal = max(0.0, min(1.0, float(metadata.get("arousal", 0.3)))) except (ValueError, TypeError): arousal = 0.3 emotion_weight = self.emotion_base + arousal * self.arousal_boost # --- Apply decay formula / 套入衰减公式 --- score = ( importance * (activation_count ** 0.3) * math.exp(-self.decay_lambda * days_since) * emotion_weight ) # --- Weight pool modifiers / 权重池修正因子 --- # Resolved events drop to 5%, sink to bottom awaiting keyword reactivation # 已解决的事件权重骤降到 5%，沉底等待关键词激活 resolved_factor = 0.05 if metadata.get("resolved", False) else 1.0 # High-arousal unresolved buckets get urgency boost for priority surfacing # 高唤醒未解决桶额外加成，优先浮现 urgency_boost = 1.5 if (arousal > 0.7 and not metadata.get("resolved", False)) else 1.0 return round(score * resolved_factor * urgency_boost, 4) # --------------------------------------------------------- # Execute one decay cycle # 执行一轮衰减周期 # Scan all dynamic buckets → score → archive those below threshold # 扫描所有动态桶 → 算分 → 低于阈值的归档 # --------------------------------------------------------- async def run_decay_cycle(self) -> dict: """ Execute one decay cycle: iterate dynamic buckets, archive those scoring below threshold. 执行一轮衰减：遍历动态桶，归档得分低于阈值的桶。 Returns stats: {"checked": N, "archived": N, "lowest_score": X} """ try: buckets = await self.bucket_mgr.list_all(include_archive=False) except Exception as e: logger.error(f"Failed to list buckets for decay / 衰减周期列桶失败: {e}") return {"checked": 0, "archived": 0, "lowest_score": 0, "error": str(e)} checked = 0 archived = 0 lowest_score = float("inf") for bucket in buckets: meta = bucket.get("metadata", {}) # Skip permanent buckets / 跳过固化桶 if meta.get("type") == "permanent": continue checked += 1 try: score = self.calculate_score(meta) except Exception as e: logger.warning( f"Score calculation failed for {bucket.get('id', '?')} / " f"计算得分失败: {e}" ) continue lowest_score = min(lowest_score, score) # --- Below threshold → archive (simulate forgetting) --- # --- 低于阈值 → 归档（模拟遗忘）--- if score < self.threshold: try: success = await self.bucket_mgr.archive(bucket["id"]) if success: archived += 1 logger.info( f"Decay archived / 衰减归档: " f"{meta.get('name', bucket['id'])} " f"(score={score:.4f}, threshold={self.threshold})" ) except Exception as e: logger.warning( f"Archive failed for {bucket.get('id', '?')} / " f"归档失败: {e}" ) result = { "checked": checked, "archived": archived, "lowest_score": lowest_score if checked > 0 else 0, } logger.info(f"Decay cycle complete / 衰减周期完成: {result}") return result # --------------------------------------------------------- # Background decay task management # 后台衰减任务管理 # --------------------------------------------------------- async def ensure_started(self) -> None: """ Ensure the decay engine is started (lazy init on first call). 确保衰减引擎已启动（懒加载，首次调用时启动）。 """ if not self._running: await self.start() async def start(self) -> None: """Start the background decay loop. 启动后台衰减循环。""" if self._running: return self._running = True self._task = asyncio.create_task(self._background_loop()) logger.info( f"Decay engine started, interval: {self.check_interval}h / " f"衰减引擎已启动，检查间隔: {self.check_interval} 小时" ) async def stop(self) -> None: """Stop the background decay loop. 停止后台衰减循环。""" self._running = False if self._task: self._task.cancel() try: await self._task except asyncio.CancelledError: pass logger.info("Decay engine stopped / 衰减引擎已停止") async def _background_loop(self) -> None: """Background loop: run decay → sleep → repeat. 后台循环体：执行衰减 → 睡眠 → 重复。""" while self._running: try: await self.run_decay_cycle() except Exception as e: logger.error(f"Decay cycle error / 衰减周期出错: {e}") # --- Wait for next cycle / 等待下一个周期 --- try: await asyncio.sleep(self.check_interval * 3600) except asyncio.CancelledError: break