64分片整体可用性：99.99% ^ 64 = 99.36%  128分片整体可用性：99.99% ^ 128 = 98.72% • Backup Request  Jeff Dean在解决BigTable高扇出时提出的方案 PS的长尾效应 Backup Request 副本1 副本2 PS Shard 1 副本1 副本2 PS Shard 2 副本1 副本2 PS Shard Shard N Predictor req 1 req 2 req N PS Req … … reply 1 reply 2 reply N … 超过t Backup Request Cancel Request 流式模型的通路 • 持久化存储  本地disk存储，持久化对齐kafka的数据 • PS快速failover  Compaction机制，降低load数据量 • Online

save_weights_only=True ) cb_earlystopping = EarlyStopping( monitor='val_accuracy', patience= 15, restore_best_weights=True ) callbacks = [cb_checkpoint, cb_earlystopping] history = model.fit(tds, validation_data=vds

could result in performance regressions on CPU-limited use cases. Set this argument to `False` to restore the previous behavior. PyTorch RN-08516-001_v23.07 | 99 Chapter 16. PyTorch Release 22.07