![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260805005007-6a7288bf1bd16.png\")
<\/p>\n
\u4e00\u3001\u4e3a\u4ec0\u4e48 Agent \u9700\u8981 Checkpoint？<\/h2>\n
\u8bbe\u60f3\u8fd9\u6837\u4e00\u4e2a\u573a\u666f\u3002\u7528\u6237\u6b63\u5728\u548c\u4f60\u7684 Agent \u4ea4\u8c08：<\/p>\n
\u8bb0\u4f4f，\u6211\u7684\u5bc6\u7801\u63d0\u793a\u662f\u300c\u84dd\u8272\u7684\u5929\u7a7a\u300d\u3002<\/p>\n
\u7d27\u63a5\u7740，\u4f60\u53d1\u5e03\u4e86\u65b0\u7248\u672c，\u670d\u52a1\u91cd\u65b0\u90e8\u7f72，\u539f\u6765\u7684 Python \u8fdb\u7a0b\u9000\u51fa\u3002\u51e0\u5206\u949f\u540e，\u7528\u6237\u56de\u6765\u95ee：<\/p>\n
\u6211\u7684\u5bc6\u7801\u63d0\u793a\u662f\u4ec0\u4e48？<\/p>\n
Agent \u5374\u56de\u7b54：<\/p>\n
\u62b1\u6b49，\u6211\u4eec\u597d\u50cf\u521a\u521a\u5f00\u59cb\u804a\u5929\u3002<\/p>\n
\u4ece\u6a21\u578b\u7684\u89d2\u5ea6\u770b，\u8fd9\u4e2a\u56de\u7b54\u5e76\u6ca1\u6709\u9519\u3002\u56e0\u4e3a\u5927\u8bed\u8a00\u6a21\u578b\u672c\u8eab\u4e0d\u4f1a\u81ea\u52a8\u4fdd\u5b58\u4e0a\u4e00\u6b21\u8c03\u7528\u7684\u72b6\u6001；\u5982\u679c\u5e94\u7528\u4e5f\u6ca1\u6709\u5c06\u6d88\u606f\u5386\u53f2\u548c\u6267\u884c\u72b6\u6001\u5b58\u4e0b\u6765，\u90a3\u4e48\u6bcf\u4e00\u6b21\u8bf7\u6c42\u90fd\u53ea\u662f\u4e00\u6b21\u5168\u65b0\u7684\u63a8\u7406\u3002<\/p>\n
\u95ee\u9898\u7684\u6839\u6e90\u4e0d\u662f\u6a21\u578b\u201c\u8bb0\u6027\u5dee\u201d，\u800c\u662f：<\/p>\n
Agent \u7684\u72b6\u6001\u9ed8\u8ba4\u53ea\u5b58\u5728\u4e8e\u5f53\u524d\u6267\u884c\u4e0a\u4e0b\u6587\u4e2d\u3002\u5e94\u7528\u4e0d\u4e3b\u52a8\u4fdd\u5b58，\u72b6\u6001\u5c31\u4e0d\u4f1a\u81ea\u52a8\u5ef6\u7eed\u3002<\/span><\/p>\n LangGraph \u7684 Checkpoint \u673a\u5236，\u5c31\u662f\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n \u5b83\u4f1a\u5728 Graph \u6267\u884c\u8fc7\u7a0b\u4e2d\u4fdd\u5b58\u72b6\u6001\u5feb\u7167，\u5e76\u901a\u8fc7\u4e00\u4e2a\u7a33\u5b9a\u7684 thread_id \u5c06\u8fd9\u4e9b\u5feb\u7167\u7ec4\u7ec7\u6210\u72ec\u7acb\u7ebf\u7a0b\u3002\u540e\u7eed\u8bf7\u6c42\u518d\u6b21\u4f7f\u7528\u76f8\u540c\u7684 thread_id \u65f6，Graph \u5c31\u80fd\u591f\u5148\u6062\u590d\u5df2\u6709\u72b6\u6001，\u518d\u7ee7\u7eed\u6267\u884c\u3002<\/p>\n \u5b98\u65b9\u6587\u6863\u5c06 Checkpointer \u5b9a\u4f4d\u4e3a\u7ebf\u7a0b\u8303\u56f4\u5185\u7684\u72b6\u6001\u6301\u4e45\u5316\u673a\u5236，\u4e3b\u8981\u7528\u4e8e\u591a\u8f6e\u5bf9\u8bdd\u3001\u4eba\u5de5\u5ba1\u6279\u3001\u6545\u969c\u6062\u590d\u548c\u65f6\u95f4\u65c5\u884c；\u8de8\u7ebf\u7a0b\u5171\u4eab\u7684\u957f\u671f\u4e8b\u5b9e，\u5219\u66f4\u9002\u5408\u653e\u5165 Store\u3002<\/p>\n \u5f88\u591a\u4eba\u7b2c\u4e00\u6b21\u770b\u5230 Checkpoint，\u4f1a\u628a\u5b83\u7406\u89e3\u6210\u201c\u81ea\u52a8\u4fdd\u5b58\u804a\u5929\u8bb0\u5f55\u201d\u3002\u8fd9\u4e2a\u7406\u89e3\u4e0d\u7b97\u9519，\u4f46\u8fd8\u4e0d\u591f\u5b8c\u6574\u3002<\/p>\n Checkpoint \u4fdd\u5b58\u7684\u4e0d\u53ea\u662f messages，\u800c\u662f\u5f53\u524d Graph State \u4e2d\u6240\u6709\u53d7\u7ba1\u7406\u7684\u72b6\u6001\u5b57\u6bb5\u3002\u4f8b\u5982：<\/p>\n class ChatState(TypedDict): \u8fd9\u4e2a State \u91cc\u5305\u542b\u4e24\u4e2a\u5b57\u6bb5：<\/p>\n messages：\u5b8c\u6574\u7684\u6d88\u606f\u5e8f\u5217；<\/p>\n<\/li>\n turn_count：\u5f53\u524d\u8bb0\u5f55\u7684\u5bf9\u8bdd\u8f6e\u6b21\u3002<\/p>\n<\/li>\n<\/ul>\n \u5982\u679c\u4e00\u4e2a\u66f4\u590d\u6742\u7684 Agent \u8fd8\u4fdd\u5b58\u4e86\u5de5\u5177\u7ed3\u679c\u3001\u5ba1\u6279\u72b6\u6001\u3001\u68c0\u7d22\u6587\u6863\u3001\u6267\u884c\u8ba1\u5212\u3001\u5f85\u5904\u7406\u4efb\u52a1\u6216\u5de5\u4f5c\u6d41\u8fdb\u5ea6，\u8fd9\u4e9b\u5b57\u6bb5\u540c\u6837\u53ef\u4ee5\u6210\u4e3a Checkpoint \u7684\u4e00\u90e8\u5206\u3002<\/p>\n \u56e0\u6b64，\u66f4\u51c6\u786e\u7684\u5b9a\u4e49\u662f：<\/p>\n Checkpoint \u662f Graph State \u5728\u67d0\u4e2a\u6267\u884c\u65f6\u523b\u7684\u72b6\u6001\u5feb\u7167\u3002<\/span><\/span><\/p>\n LangGraph \u4f1a\u5728\u6bcf\u4e2a super-step \u8fb9\u754c<\/span>\u4fdd\u5b58\u5b8c\u6574\u7684 StateSnapshot\u3002\u5728\u7ebf\u6027 Graph \u4e2d，\u4e00\u4e2a super-step \u5f80\u5f80\u5bf9\u5e94\u4e00\u6b21\u8282\u70b9\u63a8\u8fdb；\u5728\u5e76\u884c Graph \u4e2d，\u5219\u53ef\u80fd\u6709\u591a\u4e2a\u8282\u70b9\u5904\u4e8e\u540c\u4e00\u4e2a super-step\u3002<\/p>\n \u73b0\u5728\u9488\u5bf9\u672c\u6b21\u6559\u5b66，\u6211\u4eec\u5b8c\u6574\u7684\u4ee3\u7801\u5982\u4e0b：<\/p>\n """Demo 02: Checkpoint Basics \u2014 MemorySaver\u3001Thread ID\u3001\u72b6\u6001\u6062\u590d\u3002<\/p>\n \u6f14\u793a LangGraph \u5185\u7f6e\u7684 Checkpoint \u673a\u5236： \u8fd0\u884c\u65b9\u5f0f： from __future__ import annotations<\/p>\n import sys from langchain_core.messages import BaseMessage, HumanMessage sys.path.insert(0, str(Path(__file__).resolve().parent.parent.parent.parent))<\/p>\n from shared import get_llm, get_logger, log_step, log_success<\/p>\n logger = get_logger("demo.02_checkpoint_basics")<\/p>\n class ChatState(TypedDict): def build_checkpoint_graph(): def chat_node(state: ChatState) -> dict: graph = StateGraph(ChatState) # ============================================================ checkpointer = MemorySaver() config = {"configurable": {"thread_id": "demo-thread-1"}}<\/p>\n conversations = [ results = [] snapshot = app.get_state(config) return {"results": results, "checkpointer": checkpointer, "config": config}<\/p>\n # ============================================================ checkpointer = MemorySaver() config_alice = {"configurable": {"thread_id": "user-alice"}} print(" [Alice \u7684\u5bf9\u8bdd]") print(" [Bob \u7684\u5bf9\u8bdd]") print("\\\\n [\u9a8c\u8bc1\u9694\u79bb]") alice_msgs = alice_state.values.get("messages", []) print(f" Alice \u6d88\u606f\u6570: {len(alice_msgs)}") alice_has_alice = any("Alice" in str(m.content) or "alice" in str(m.content) for m in alice_msgs) return { # ============================================================ checkpointer = MemorySaver() config = {"configurable": {"thread_id": "recovery-thread"}}<\/p>\n log_step(logger, "\u9636\u6bb5 1", "\u521b\u5efa\u5bf9\u8bdd\u5e76\u79ef\u7d2f\u72b6\u6001") app1.invoke( state_before = app1.get_state(config) log_step(logger, "\u9636\u6bb5 2", "\u6a21\u62df\u8fdb\u7a0b\u91cd\u542f \u2014 \u7528\u540c\u4e00\u4e2a checkpointer \u521b\u5efa\u65b0\u7684 app") state_after = app2.get_state(config) result = app2.invoke( log_success(logger, f"\u72b6\u6001\u6062\u590d\u6210\u529f！\u6062\u590d\u524d {msg_count_before} \u6761 \u2192 \u6062\u590d\u540e {msg_count_after} \u6761") return { # ============================================================ checkpointer = MemorySaver() config = {"configurable": {"thread_id": "history-thread"}}<\/p>\n steps = ["\u7b2c\u4e00\u6b65", "\u7b2c\u4e8c\u6b65", "\u7b2c\u4e09\u6b65"] print(" Checkpoint \u5386\u53f2:") print(f"\\\\n \u603b\u5171 {history_count}+ \u4e2a Checkpoint \u7248\u672c") return {"history_count": history_count}<\/p>\n def run_demo() -> dict: basic = demo_basic_checkpoint() print() return { if __name__ == "__main__": \u6574\u4e2a Checkpoint \u7cfb\u7edf\u53ef\u4ee5\u62c6\u6210\u4e09\u4e2a\u6838\u5fc3\u6982\u5ff5\u3002<\/p>\n Checkpointer \u51b3\u5b9a\u72b6\u6001\u4fdd\u5b58\u5728\u54ea\u91cc\u3002\u672c\u6587\u4ee3\u7801\u4f7f\u7528）：<\/p>\n from langgraph.checkpoint.memory import MemorySaver<\/p>\n \u5e76\u521b\u5efa\u4e00\u4e2a\u7eaf\u5185\u5b58\u540e\u7aef：<\/p>\n checkpointer = MemorySaver()<\/p>\n MemorySaver \u4f7f\u7528\u5f53\u524d Python \u8fdb\u7a0b\u7684\u5185\u5b58\u4fdd\u5b58 Checkpoint，\u9002\u5408：<\/p>\n \u672c\u5730\u5b66\u4e60；<\/p>\n<\/li>\n \u5355\u5143\u6d4b\u8bd5；<\/p>\n<\/li>\n \u5feb\u901f\u9a8c\u8bc1；<\/p>\n<\/li>\n \u5f00\u53d1\u9636\u6bb5\u8c03\u8bd5\u3002<\/p>\n<\/li>\n<\/ul>\n \u4f46\u5b83\u4e0d\u9002\u5408\u771f\u6b63\u7684\u751f\u4ea7\u6301\u4e45\u5316，\u56e0\u4e3a Python \u8fdb\u7a0b\u9000\u51fa\u540e，\u5185\u5b58\u4e2d\u7684\u6570\u636e\u4e5f\u4f1a\u6d88\u5931\u3002\u5b98\u65b9\u6587\u6863\u540c\u6837\u660e\u786e\u6307\u51fa，MemorySaver \u548c InMemorySaver \u7684\u6570\u636e\u4e0d\u4f1a\u5728\u8fdb\u7a0b\u91cd\u542f\u540e\u4fdd\u7559\u3002<\/p>\n \u6bcf\u6b21\u8c03\u7528\u5e26 Checkpointer \u7684 Graph \u65f6，\u90fd\u9700\u8981\u4f20\u5165：<\/p>\n config = {"configurable": {"thread_id": "demo-thread-1"}}<\/p>\n thread_id \u53ef\u4ee5\u7406\u89e3\u6210\u4e00\u628a\u94a5\u5319\u3002<\/p>\n \u76f8\u540c\u7684 thread_id：\u7ee7\u7eed\u8bfb\u53d6\u539f\u6709\u72b6\u6001；<\/p>\n<\/li>\n \u4e0d\u540c\u7684 thread_id：\u521b\u5efa\u76f8\u4e92\u9694\u79bb\u7684\u65b0\u7ebf\u7a0b；<\/p>\n<\/li>\n \u6ca1\u6709 thread_id：Checkpointer \u4e0d\u77e5\u9053\u5e94\u8be5\u8bfb\u53d6\u6216\u5199\u5165\u54ea\u6761\u72b6\u6001\u94fe\u3002<\/p>\n<\/li>\n<\/ul>\n \u5b98\u65b9\u6587\u6863\u5c06 thread_id \u63cf\u8ff0\u4e3a Checkpointer \u4fdd\u5b58\u548c\u52a0\u8f7d\u72b6\u6001\u65f6\u4f7f\u7528\u7684\u4e3b\u8981\u6807\u8bc6\u3002<\/p>\n \u540c\u4e00\u4e2a\u7ebf\u7a0b\u4e0d\u662f\u53ea\u4fdd\u5b58\u4e00\u4e2a\u6700\u7ec8\u72b6\u6001\u3002\u968f\u7740 Graph \u4e0d\u65ad\u6267\u884c，Checkpointer \u4f1a\u6301\u7eed\u4ea7\u751f\u65b0\u7684\u72b6\u6001\u7248\u672c：<\/p>\n checkpoint_1 \u8fd9\u610f\u5473\u7740\u5e94\u7528\u4e0d\u4ec5\u80fd\u591f\u8bfb\u53d6\u201c\u6700\u65b0\u72b6\u6001\u201d，\u8fd8\u53ef\u4ee5\u67e5\u770b\u5386\u53f2\u72b6\u6001，\u5e76\u4ece\u67d0\u4e2a\u5386\u53f2 Checkpoint \u91cd\u65b0\u6267\u884c\u540e\u7eed\u8282\u70b9\u3002<\/p>\n \u8fd9\u4e5f\u662f LangGraph \u80fd\u591f\u5b9e\u73b0\u4ee5\u4e0b\u80fd\u529b\u7684\u57fa\u7840：<\/p>\n \u5bf9\u8bdd\u72b6\u6001\u6062\u590d；<\/p>\n<\/li>\n Human-in-the-loop；<\/p>\n<\/li>\n \u6545\u969c\u7eed\u8dd1；<\/p>\n<\/li>\n \u5386\u53f2\u8c03\u8bd5；<\/p>\n<\/li>\n Replay；<\/p>\n<\/li>\n Fork；<\/p>\n<\/li>\n Time Travel\u3002<\/p>\n<\/li>\n<\/ul>\n \u53ef\u4ee5\u628a\u4e00\u6b21\u8c03\u7528\u7406\u89e3\u6210\u4ee5\u4e0b\u8fc7\u7a0b：<\/p>\n \u8fd9\u91cc\u6700\u5bb9\u6613\u88ab\u5ffd\u7565\u7684\u662f Reducer<\/span>\u3002<\/p>\n \u6062\u590d\u72b6\u6001\u5e76\u4e0d\u610f\u5473\u7740\u7b80\u5355\u5730\u7528\u65b0\u8f93\u5165\u8986\u76d6\u65e7\u72b6\u6001\u3002\u6bcf\u4e00\u4e2a State \u5b57\u6bb5\u90fd\u6709\u81ea\u5df1\u7684\u66f4\u65b0\u89c4\u5219：<\/p>\n \u58f0\u660e\u4e86 Reducer \u7684\u5b57\u6bb5，\u6309\u7167 Reducer \u5408\u5e76；<\/p>\n<\/li>\n \u6ca1\u6709\u58f0\u660e Reducer \u7684\u5b57\u6bb5，\u901a\u5e38\u7531\u65b0\u503c\u76f4\u63a5\u8986\u76d6\u65e7\u503c\u3002<\/p>\n<\/li>\n<\/ul>\n \u5728\u672c\u6587\u4ee3\u7801\u4e2d：<\/p>\n class ChatState(TypedDict): messages \u4f7f\u7528\u4e86 add_messages，\u56e0\u6b64\u65b0\u7684\u6d88\u606f\u4f1a\u8ffd\u52a0\u5230\u5df2\u6709\u6d88\u606f\u5217\u8868\u4e2d\u3002<\/p>\n turn_count \u6ca1\u6709\u81ea\u5b9a\u4e49 Reducer，\u6240\u4ee5\u5b83\u91c7\u7528\u9ed8\u8ba4\u8986\u76d6\u884c\u4e3a\u3002<\/p>\n \u8fd9\u4e2a\u5dee\u5f02，\u6b63\u662f\u540e\u9762\u51fa\u73b0\u201c\u6d88\u606f\u6570\u91cf\u662f 6，\u4f46 turn_count \u59cb\u7ec8\u662f 1\u201d\u7684\u539f\u56e0\u3002<\/p>\n \u672c\u6587 Demo \u7684 Graph \u975e\u5e38\u7b80\u5355：<\/p>\n START \u2192 chat \u2192 END<\/p>\n Graph \u7684\u6784\u5efa\u4ee3\u7801\u5982\u4e0b，\u4fdd\u6301\u539f\u6837：<\/p>\n def build_checkpoint_graph(): def chat_node(state: ChatState) -> dict: graph = StateGraph(ChatState) chat_node \u505a\u4e86\u4e24\u4ef6\u4e8b：<\/p>\n \u5c06\u5f53\u524d messages \u4f20\u7ed9\u6a21\u578b；<\/p>\n<\/li>\n \u8fd4\u56de\u4e00\u6761\u65b0\u7684 AI \u6d88\u606f\u548c\u66f4\u65b0\u540e\u7684 turn_count\u3002<\/p>\n<\/li>\n \u9700\u8981\u6ce8\u610f，build_checkpoint_graph() \u8fd4\u56de\u7684\u53ea\u662f Graph Builder\u3002<\/p>\n \u771f\u6b63\u8ba9 Graph \u83b7\u5f97\u72b6\u6001\u4fdd\u5b58\u80fd\u529b\u7684，\u662f\u7f16\u8bd1\u65f6\u4f20\u5165\u7684 Checkpointer：<\/p>\n checkpointer = MemorySaver() \u540c\u4e00\u4efd Graph \u7ed3\u6784，\u53ef\u4ee5\u6839\u636e\u9700\u8981\u6302\u8f7d\u4e0d\u540c\u540e\u7aef：<\/p>\n Graph Builder Graph \u8d1f\u8d23\u5b9a\u4e49\u6267\u884c\u903b\u8f91，Checkpointer \u8d1f\u8d23\u4fdd\u5b58\u6267\u884c\u72b6\u6001\u3002\u4e24\u8005\u662f\u89e3\u8026\u7684\u3002<\/p>\n \u7b2c\u4e00\u4e2a\u6f14\u793a\u8fde\u7eed\u53d1\u8d77\u4e09\u8f6e\u5bf9\u8bdd：<\/p>\n conversations = [ \u6240\u6709\u8bf7\u6c42\u90fd\u4f7f\u7528\u76f8\u540c\u7684\u914d\u7f6e：<\/p>\n config = {"configurable": {"thread_id": "demo-thread-1"}}<\/p>\n \u8c03\u7528\u4ee3\u7801\u4fdd\u6301\u539f\u6837：<\/p>\n result = app.invoke( \u4e09\u6b21\u8c03\u7528\u7684\u72b6\u6001\u53d8\u5316\u53ef\u4ee5\u8868\u793a\u4e3a：<\/p>\n \u7b2c\u4e09\u6b21\u8c03\u7528\u524d，Graph \u4f1a\u5148\u6062\u590d\u524d\u4e24\u6b21\u8c03\u7528\u7559\u4e0b\u7684\u6d88\u606f：<\/p>\n Human: \u4f60\u597d，\u6211\u53eb\u674e\u660e \u6a21\u578b\u6536\u5230\u7684\u5e76\u4e0d\u53ea\u662f\u6700\u540e\u4e00\u4e2a\u95ee\u9898，\u800c\u662f\u6062\u590d\u5e76\u5408\u5e76\u540e\u7684\u5b8c\u6574\u6d88\u606f\u5e8f\u5217，\u56e0\u6b64\u5b83\u80fd\u591f\u56de\u7b54\u201c\u674e\u660e\u201d\u3002<\/p>\n \u6700\u540e\u901a\u8fc7：<\/p>\n snapshot = app.get_state(config)<\/p>\n \u8bfb\u53d6\u6700\u65b0\u72b6\u6001：<\/p>\n Checkpoint \u72b6\u6001: \u5173\u952e\u5728\u4e8e\u6bcf\u6b21\u8c03\u7528\u90fd\u663e\u5f0f\u4f20\u5165\u4e86：<\/p>\n "turn_count": 0<\/p>\n \u800c turn_count \u6ca1\u6709 Reducer\u3002<\/p>\n \u56e0\u6b64\u6bcf\u4e00\u6b21 invoke \u6062\u590d\u65e7\u72b6\u6001\u4e4b\u540e，\u672c\u6b21\u8f93\u5165\u4e2d\u7684 0 \u53c8\u4f1a\u8986\u76d6\u65e7\u503c，\u968f\u540e chat_node \u6267\u884c：<\/p>\n state.get("turn_count", 0) + 1<\/p>\n \u6700\u7ec8\u91cd\u65b0\u5f97\u5230 1\u3002<\/p>\n \u6267\u884c\u8fc7\u7a0b\u5b9e\u9645\u4e0a\u662f：<\/p>\n \u4e0a\u6b21 Checkpoint：turn_count = 1 \u8fd9\u4e2a\u73b0\u8c61\u975e\u5e38\u6709\u6559\u5b66\u4ef7\u503c：<\/p>\n Checkpoint \u8d1f\u8d23\u6062\u590d\u72b6\u6001，\u4f46\u72b6\u6001\u5982\u4f55\u5408\u5e76，\u6700\u7ec8\u7531\u6bcf\u4e2a\u5b57\u6bb5\u7684 Reducer \u51b3\u5b9a\u3002<\/span><\/span><\/p>\n \u7b2c\u4e8c\u4e2a\u6f14\u793a\u521b\u5efa\u4e86\u4e24\u4e2a\u72ec\u7acb\u7ebf\u7a0b：<\/p>\n config_alice = {"configurable": {"thread_id": "user-alice"}} Alice \u7ebf\u7a0b\u5199\u5165：<\/p>\n HumanMessage(content="\u6211\u53eb Alice，\u6211\u559c\u6b22\u732b")<\/p>\n Bob \u7ebf\u7a0b\u5199\u5165：<\/p>\n HumanMessage(content="\u6211\u53eb Bob，\u6211\u559c\u6b22\u72d7")<\/p>\n \u7531\u4e8e\u4e24\u6b21\u8c03\u7528\u4f7f\u7528\u4e0d\u540c\u7684 thread_id，Checkpointer \u4f1a\u4e3a\u5b83\u4eec\u5206\u522b\u7ef4\u62a4\u72ec\u7acb\u7684\u72b6\u6001\u94fe\u3002<\/p>\n \u4ee3\u7801\u968f\u540e\u5206\u522b\u8bfb\u53d6\u4e24\u4e2a\u7ebf\u7a0b\u7684\u6700\u65b0\u72b6\u6001：<\/p>\n alice_state = app.get_state(config_alice) \u8fd0\u884c\u7ed3\u679c：<\/p>\n Alice \u6d88\u606f\u6570: 2 \u6bcf\u6761\u7ebf\u7a0b\u4e2d\u90fd\u53ea\u6709：<\/p>\n 1 \u6761 HumanMessage \u72b6\u6001\u6ca1\u6709\u4e92\u76f8\u6df7\u5165\u3002<\/p>\n \u901a\u5e38\u4e0d\u8981\u76f4\u63a5\u628a thread_id \u5199\u6b7b\u6210：<\/p>\n "thread_id": "default"<\/p>\n \u66f4\u7a33\u59a5\u7684\u65b9\u5f0f\u662f\u5c06\u7528\u6237\u6807\u8bc6\u548c\u4f1a\u8bdd\u6807\u8bc6\u7ec4\u5408\u8d77\u6765：<\/p>\n thread_id = f"{user_id}:{conversation_id}"<\/p>\n \u5176\u4e2d：<\/p>\n user_id \u7528\u4e8e\u533a\u5206\u7528\u6237；<\/p>\n<\/li>\n conversation_id \u7528\u4e8e\u533a\u5206\u540c\u4e00\u7528\u6237\u7684\u591a\u4e2a\u4f1a\u8bdd\u3002<\/p>\n<\/li>\n<\/ul>\n \u4f8b\u5982：<\/p>\n u1001:conversation-001 \u8fd9\u6837，\u540c\u4e00\u4e2a\u7528\u6237\u53ef\u4ee5\u62e5\u6709\u591a\u4e2a\u5f7c\u6b64\u9694\u79bb\u7684\u5bf9\u8bdd\u3002\u8fd8\u9700\u8981\u6ce8\u610f：<\/p>\n thread_id \u662f\u72b6\u6001\u9694\u79bb\u6807\u8bc6，\u4e0d\u5e94\u76f4\u63a5\u627f\u62c5\u6743\u9650\u6821\u9a8c\u3002<\/p>\n \u670d\u52a1\u7aef\u4ecd\u7136\u9700\u8981\u786e\u8ba4\u5f53\u524d\u8bf7\u6c42\u7528\u6237\u662f\u5426\u6709\u6743\u8bbf\u95ee\u8fd9\u4e2a thread_id，\u5426\u5219\u653b\u51fb\u8005\u53ea\u8981\u731c\u5230\u522b\u4eba\u7684\u7ebf\u7a0b\u6807\u8bc6，\u5c31\u53ef\u80fd\u5c1d\u8bd5\u8bfb\u53d6\u4e0d\u5c5e\u4e8e\u81ea\u5df1\u7684\u72b6\u6001\u3002<\/p>\n \u7b2c\u4e09\u4e2a\u6f14\u793a\u5148\u4f7f\u7528 app1 \u5199\u5165\u4e24\u8f6e\u5bf9\u8bdd：<\/p>\n app1.invoke( \u8fd9\u65f6，Checkpoint \u4e2d\u5171\u6709 4 \u6761\u6d88\u606f：<\/p>\n Human：\u8bb0\u4f4f，\u6211\u7684\u5bc6\u7801\u63d0\u793a\u662f\u201c\u84dd\u8272\u7684\u5929\u7a7a\u201d \u63a5\u7740，\u4ee3\u7801\u91cd\u65b0\u7f16\u8bd1\u51fa\u4e00\u4e2a\u65b0\u7684 app2：<\/p>\n app2 = graph.compile(checkpointer=checkpointer)<\/p>\n \u56e0\u4e3a app1 \u548c app2 \u4f7f\u7528\u7684\u662f\u540c\u4e00\u4e2a checkpointer \u5b9e\u4f8b，\u6240\u4ee5 app2 \u80fd\u591f\u8bfb\u53d6 app1 \u5df2\u7ecf\u4fdd\u5b58\u7684\u72b6\u6001\u3002<\/p>\n \u968f\u540e\u63d0\u95ee：<\/p>\n result = app2.invoke( \u6a21\u578b\u80fd\u591f\u4ece\u6062\u590d\u540e\u7684\u6d88\u606f\u5386\u53f2\u4e2d\u627e\u5230\u7b54\u6848：<\/p>\n \u52a9\u624b：\u4f60\u6700\u559c\u6b22\u7684\u662f Rust\u3002<\/p>\n \u539f\u4ee3\u7801\u4e2d\u7684\u65e5\u5fd7\u63cf\u8ff0\u662f：<\/p>\n log_step(logger, "\u9636\u6bb5 2", "\u6a21\u62df\u8fdb\u7a0b\u91cd\u542f \u2014 \u7528\u540c\u4e00\u4e2a checkpointer \u521b\u5efa\u65b0\u7684 app")<\/p>\n \u8fd9\u91cc\u7684\u201c\u6a21\u62df\u8fdb\u7a0b\u91cd\u542f\u201d\u4e0d\u80fd\u6309\u5b57\u9762\u7406\u89e3\u6210\u771f\u6b63\u6740\u6389\u5e76\u91cd\u542f Python \u8fdb\u7a0b\u3002<\/p>\n \u4ee3\u7801\u5b9e\u9645\u6a21\u62df\u7684\u662f：<\/p>\n \u91cd\u65b0\u521b\u5efa\u7f16\u8bd1\u540e\u7684 Graph \u5e94\u7528，\u4f46\u4ecd\u7136\u590d\u7528\u539f\u6765\u7684 MemorySaver \u5bf9\u8c61\u3002<\/span><\/p>\n \u53ea\u8981\u4e0b\u9762\u8fd9\u4e2a\u5bf9\u8c61\u8fd8\u5728\u5185\u5b58\u4e2d：<\/p>\n checkpointer = MemorySaver()<\/p>\n \u72b6\u6001\u5c31\u8fd8\u5728\u3002<\/p>\n \u4f46\u771f\u6b63\u7ed3\u675f Python \u8fdb\u7a0b\u540e：<\/p>\n Python \u8fdb\u7a0b\u9000\u51fa \u6240\u4ee5\u8fd9\u4e2a Demo \u8bc1\u660e\u7684\u662f：<\/p>\n \u53ea\u8981\u65b0\u7684 Graph \u5e94\u7528\u80fd\u591f\u8bbf\u95ee\u540c\u4e00\u4e2a Checkpointer \u540e\u7aef，\u5c31\u53ef\u4ee5\u6062\u590d\u539f\u6709\u72b6\u6001\u3002<\/span><\/p>\n \u5b83\u6ca1\u6709\u8bc1\u660e：<\/p>\n MemorySaver \u53ef\u4ee5\u8de8\u8fdb\u7a0b\u91cd\u542f\u4fdd\u5b58\u6570\u636e\u3002<\/p>\n \u771f\u6b63\u9700\u8981\u8de8\u8fdb\u7a0b\u3001\u8de8\u673a\u5668\u6216\u8de8\u90e8\u7f72\u6062\u590d\u65f6，\u5fc5\u987b\u4f7f\u7528\u5916\u90e8\u6301\u4e45\u5316\u540e\u7aef，\u4f8b\u5982 SQLite\u3001PostgreSQL \u6216 Redis\u3002<\/p>\n \u4ee3\u7801\u8fde\u7eed\u8c03\u7528\u4e09\u6b21 Graph：<\/p>\n steps = ["\u7b2c\u4e00\u6b65", "\u7b2c\u4e8c\u6b65", "\u7b2c\u4e09\u6b65"] \u968f\u540e\u904d\u5386\u5386\u53f2\u72b6\u6001：<\/p>\n for state in app.get_state_history(config): \u8f93\u51fa\u7c7b\u4f3c：<\/p>\n \u7248\u672c 1: 6 \u6761\u6d88\u606f \u56e0\u4e3a Checkpoint \u5e76\u4e0d\u662f\u201c\u6bcf\u6b21 invoke \u53ea\u4fdd\u5b58\u4e00\u6b21\u201d\u3002LangGraph \u4f1a\u5728 super-step \u8fb9\u754c\u4fdd\u5b58\u72b6\u6001\u3002\u5bf9\u4e8e\u672c\u6587\u8fd9\u4e2a\u53ea\u6709\u4e00\u4e2a chat \u8282\u70b9\u7684\u7ebf\u6027 Graph，\u4e00\u6b21\u8c03\u7528\u901a\u5e38\u81f3\u5c11\u4f1a\u7ecf\u5386：<\/p>\n \u8f93\u5165\u88ab\u5199\u5165\u72b6\u6001 \u56e0\u6b64\u5386\u53f2\u4e2d\u53ef\u80fd\u540c\u65f6\u51fa\u73b0：<\/p>\n 5 \u6761\u6d88\u606f：\u65b0 HumanMessage \u5df2\u5199\u5165，AIMessage \u5c1a\u672a\u751f\u6210 \u8fd9\u6b63\u597d\u89e3\u91ca\u4e86\u5386\u53f2\u8f93\u51fa\u4e2d\u7684：<\/p>\n 6 \u2192 5 \u2192 4 \u2192 4 \u2192 3 \u2192 2<\/p>\n \u5176\u4e2d\u91cd\u590d\u7684 4 \u5e76\u4e0d\u8868\u793a\u91cd\u590d\u4fdd\u5b58\u4e86\u5b8c\u5168\u76f8\u540c\u7684\u6267\u884c\u4f4d\u7f6e，\u800c\u53ef\u80fd\u5206\u522b\u5bf9\u5e94：<\/p>\n \u4e0a\u4e00\u8f6e\u6267\u884c\u5b8c\u6210\u540e\u7684\u72b6\u6001；<\/p>\n<\/li>\n \u4e0b\u4e00\u8f6e\u8f93\u5165\u8fdb\u5165\u4e4b\u524d\u6216\u4e4b\u540e\u7684\u72b6\u6001\u8fb9\u754c\u3002<\/p>\n<\/li>\n<\/ul>\n get_state_history(config) \u9ed8\u8ba4\u6309\u5012\u5e8f\u8fd4\u56de\u72b6\u6001：<\/p>\n \u6700\u65b0 Checkpoint \u56e0\u6b64\u8f93\u51fa\u4e2d\u7684\u201c\u7248\u672c 1\u201d\u5b9e\u9645\u4e0a\u662f\u6700\u65b0\u72b6\u6001，\u800c\u4e0d\u662f\u6700\u8001\u72b6\u6001\u3002\u5b98\u65b9\u65f6\u95f4\u65c5\u884c\u6587\u6863\u4e5f\u660e\u786e\u8bf4\u660e，get_state_history() \u8fd4\u56de\u7684\u662f\u9006\u65f6\u95f4\u987a\u5e8f\u3002<\/p>\n Checkpoint \u5386\u53f2\u4e0d\u4ec5\u53ef\u4ee5\u67e5\u770b，\u8fd8\u53ef\u4ee5\u7528\u4e8e Replay \u548c Fork\u3002\u4f46\u8fd9\u91cc\u6709\u4e00\u4e2a\u91cd\u8981\u533a\u522b：<\/p>\n history = list(app.get_state_history(config))<\/p>\n \u53ea\u662f\u8bfb\u53d6\u5386\u53f2 StateSnapshot，\u4e0d\u4f1a\u91cd\u65b0\u8c03\u7528\u6a21\u578b\u6216\u5de5\u5177\u3002<\/p>\n \u5982\u679c\u4f7f\u7528\u67d0\u4e2a\u5386\u53f2 Checkpoint \u7684 config \u518d\u6b21\u8c03\u7528 Graph，Checkpoint \u4e4b\u524d\u7684\u6b65\u9aa4\u4e0d\u4f1a\u91cd\u65b0\u8fd0\u884c，\u4f46\u5176\u540e\u7684\u8282\u70b9\u4f1a\u518d\u6b21\u6267\u884c\u3002<\/p>\n \u8fd9\u610f\u5473\u7740：<\/p>\n LLM \u53ef\u80fd\u4ea7\u751f\u4e0d\u540c\u56de\u7b54；<\/p>\n<\/li>\n \u5916\u90e8 API \u4f1a\u518d\u6b21\u8bf7\u6c42；<\/p>\n<\/li>\n \u5de5\u5177\u8c03\u7528\u53ef\u80fd\u4ea7\u751f\u65b0\u7684\u526f\u4f5c\u7528；<\/p>\n<\/li>\n Human-in-the-loop \u4e2d\u65ad\u53ef\u80fd\u518d\u6b21\u89e6\u53d1\u3002<\/p>\n<\/li>\n<\/ul>\n \u5b98\u65b9\u6587\u6863\u7279\u522b\u63d0\u9192：Replay \u4f1a\u91cd\u65b0\u6267\u884c Checkpoint \u540e\u9762\u7684\u8282\u70b9，\u800c\u4e0d\u662f\u7b80\u5355\u5730\u4ece\u7f13\u5b58\u4e2d\u8bfb\u53d6\u65e7\u7ed3\u679c\u3002<\/p>\n \u56e0\u6b64，\u652f\u6301\u65f6\u95f4\u65c5\u884c\u7684\u751f\u4ea7 Agent \u5fc5\u987b\u8003\u8651\u8282\u70b9\u7684\u5e42\u7b49\u6027\u3002\u4f8b\u5982，\u4e0b\u9762\u8fd9\u4e9b\u64cd\u4f5c\u4e0d\u80fd\u5728 Replay \u65f6\u65e0\u6761\u4ef6\u91cd\u590d：<\/p>\n \u53d1\u9001\u4ed8\u6b3e \u66f4\u7a33\u59a5\u7684\u505a\u6cd5\u662f\u4e3a\u526f\u4f5c\u7528\u64cd\u4f5c\u589e\u52a0\u4e1a\u52a1\u5e42\u7b49\u952e\u3002<\/p>\n \u5f88\u591a\u6587\u7ae0\u4f1a\u7b3c\u7edf\u5730\u628a\u4e24\u8005\u90fd\u53eb\u4f5c\u201cAgent \u8bb0\u5fc6\u201d，\u4f46\u5b83\u4eec\u89e3\u51b3\u7684\u95ee\u9898\u4e0d\u540c\u3002<\/p>\n \u4f8b\u5982：<\/p>\n \u201c\u8fd9\u8f6e\u5bf9\u8bdd\u91cc，\u7528\u6237\u521a\u4e0a\u4f20\u4e86\u4e00\u4e2a\u6587\u4ef6\u201d<\/p>\n \u9002\u5408\u653e\u5165\u5f53\u524d\u7ebf\u7a0b\u7684 State\u3002\u800c：<\/p>\n \u201c\u7528\u6237\u957f\u671f\u504f\u597d\u4f7f\u7528\u6df1\u8272\u4e3b\u9898\u201d<\/p>\n \u66f4\u9002\u5408\u653e\u5165 Store\u3002<\/p>\n \u5b98\u65b9\u6587\u6863\u5c06 Checkpointer \u5b9a\u4e49\u4e3a thread-scoped short-term memory，\u5c06 Store \u5b9a\u4e49\u4e3a\u8de8\u7ebf\u7a0b\u7684\u957f\u671f\u6570\u636e\u5b58\u50a8\u3002<\/p>\n \u9519\u8bef\u8c03\u7528：<\/p>\n app.invoke({"messages": [HumanMessage(content="\u4f60\u597d")]})<\/p>\n \u6302\u8f7d Checkpointer \u540e，\u6bcf\u6b21\u8c03\u7528\u90fd\u5e94\u8be5\u5e26\u4e0a：<\/p>\n config = { \u5426\u5219 Checkpointer \u65e0\u6cd5\u786e\u5b9a\u72b6\u6001\u5c5e\u4e8e\u54ea\u4e2a\u7ebf\u7a0b\u3002<\/p>\n \u8fd9\u662f\u6b63\u5e38\u884c\u4e3a\u3002MemorySaver \u7684\u6570\u636e\u53ea\u5b58\u5728\u4e8e\u5f53\u524d Python \u8fdb\u7a0b\u4e2d\u3002<\/p>\n \u9002\u7528\u573a\u666f：<\/p>\n \u5b66\u4e60 \/ Demo \/ \u6d4b\u8bd5 \/ \u672c\u5730\u8c03\u8bd5<\/p>\n \u4e0d\u9002\u7528\u573a\u666f：<\/p>\n \u751f\u4ea7\u670d\u52a1 \/ \u591a\u8fdb\u7a0b\u90e8\u7f72 \/ \u5bb9\u5668\u6eda\u52a8\u53d1\u5e03 \/ \u8de8\u673a\u5668\u6062\u590d<\/p>\n \u751f\u4ea7\u73af\u5883\u5e94\u4f7f\u7528\u5916\u90e8\u6301\u4e45\u5316 Checkpointer\u3002<\/p>\n \u6700\u5e38\u89c1\u539f\u56e0\u662f\u6240\u6709\u8bf7\u6c42\u4f7f\u7528\u4e86\u540c\u4e00\u4e2a\u56fa\u5b9a\u503c：<\/p>\n "thread_id": "default"<\/p>\n \u7ed3\u679c\u662f\u6240\u6709\u7528\u6237\u90fd\u5728\u8bfb\u5199\u540c\u4e00\u6761\u72b6\u6001\u94fe\u3002\u63a8\u8350\u81f3\u5c11\u5305\u542b：<\/p>\n user_id + conversation_id<\/p>\n \u5e76\u5728\u670d\u52a1\u7aef\u9a8c\u8bc1\u7ebf\u7a0b\u5f52\u5c5e\u5173\u7cfb\u3002<\/p>\n Checkpoint \u53ea\u8d1f\u8d23\u6062\u590d\u72b6\u6001\u3002\u5b57\u6bb5\u7a76\u7adf\u662f\u8ffd\u52a0\u3001\u6c42\u548c\u3001\u5408\u5e76\u8fd8\u662f\u8986\u76d6，\u7531 Reducer \u51b3\u5b9a\u3002<\/p>\n \u672c\u6587\u4e2d：<\/p>\n messages: Annotated[list[BaseMessage], add_messages]<\/p>\n \u4f1a\u8ffd\u52a0\u6d88\u606f\u3002\u800c：<\/p>\n turn_count: int<\/p>\n \u9ed8\u8ba4\u4f1a\u88ab\u65b0\u8f93\u5165\u8986\u76d6\u3002\u56e0\u6b64，\u8bbe\u8ba1 State \u65f6\u4e0d\u80fd\u53ea\u5173\u6ce8\u5b57\u6bb5\u7c7b\u578b，\u8fd8\u8981\u5173\u6ce8\u5b57\u6bb5\u66f4\u65b0\u8bed\u4e49\u3002<\/p>\n \u751f\u4ea7\u7cfb\u7edf\u4e2d\u7684 State Schema \u4f1a\u968f\u7740\u4e1a\u52a1\u8fed\u4ee3\u53d1\u751f\u53d8\u5316，\u4f8b\u5982：<\/p>\n v1: \u5347\u7ea7\u540e\u53d8\u6210：<\/p>\n v2: \u5982\u679c\u65b0\u4ee3\u7801\u76f4\u63a5\u5047\u8bbe\u6240\u6709\u5386\u53f2\u72b6\u6001\u90fd\u6709\u65b0\u5b57\u6bb5，\u5c31\u53ef\u80fd\u5728\u6062\u590d\u65e7\u7ebf\u7a0b\u65f6\u62a5\u9519\u3002<\/p>\n \u53ef\u4ee5\u91c7\u7528\u4ee5\u4e0b\u7b56\u7565：<\/p>\n \u65b0\u5b57\u6bb5\u63d0\u4f9b\u9ed8\u8ba4\u503c；<\/p>\n<\/li>\n \u8bfb\u53d6\u65f6\u4f7f\u7528 state.get()；<\/p>\n<\/li>\n \u5728 State \u4e2d\u589e\u52a0 schema_version；<\/p>\n<\/li>\n \u7f16\u5199\u8fc1\u79fb\u903b\u8f91；<\/p>\n<\/li>\n \u91cd\u5927\u4e0d\u517c\u5bb9\u5347\u7ea7\u65f6\u521b\u5efa\u65b0\u7684\u7ebf\u7a0b\u547d\u540d\u7a7a\u95f4\u3002<\/p>\n<\/li>\n<\/ul>\n \u957f\u65f6\u95f4\u8fd0\u884c\u7684 Agent \u53ef\u80fd\u4ea7\u751f\u5927\u91cf\u7248\u672c\u3002\u800c\u4e14\u8981\u533a\u5206\u4e24\u4ef6\u4e8b：<\/p>\n \u51cf\u5c11\u53d1\u9001\u7ed9 LLM \u7684\u6d88\u606f\u6570\u91cf，\u63a7\u5236 Token \u6210\u672c\u3002<\/p>\n \u51cf\u5c11\u6301\u4e45\u5316\u540e\u7aef\u4e2d\u7684\u5386\u53f2\u72b6\u6001\u7248\u672c，\u63a7\u5236\u5b58\u50a8\u6210\u672c\u3002\u53ea\u88c1\u526a\u4e0a\u4e0b\u6587，\u4e0d\u4e00\u5b9a\u4f1a\u5220\u9664\u5df2\u7ecf\u4fdd\u5b58\u7684\u5386\u53f2 Checkpoint\u3002<\/p>\n \u751f\u4ea7\u73af\u5883\u9700\u8981\u5355\u72ec\u8bbe\u8ba1：<\/p>\n \u6570\u636e\u4fdd\u7559\u5468\u671f；<\/p>\n<\/li>\n \u6700\u8fd1\u7248\u672c\u4fdd\u7559\u6570\u91cf；<\/p>\n<\/li>\n \u51b7\u70ed\u6570\u636e\u5206\u5c42；<\/p>\n<\/li>\n \u4f1a\u8bdd\u5f52\u6863；<\/p>\n<\/li>\n \u7528\u6237\u5220\u9664\u6570\u636e\u6d41\u7a0b\u3002<\/p>\n<\/li>\n<\/ul>\n \u751f\u4ea7\u73af\u5883\u7684\u5173\u952e\u8981\u6c42\u4e0d\u662f\u201c\u5bf9\u8c61\u80fd\u590d\u7528\u201d，\u800c\u662f：<\/p>\n \u8fdb\u7a0b\u9000\u51fa\u540e，\u72b6\u6001\u4ecd\u7136\u5b58\u5728<\/p>\n \u8fd8\u8981\u652f\u6301：<\/p>\n \u591a\u5b9e\u4f8b\u8bbf\u95ee；<\/p>\n<\/li>\n \u5931\u8d25\u91cd\u8bd5；<\/p>\n<\/li>\n \u8fde\u63a5\u6c60；<\/p>\n<\/li>\n \u5907\u4efd\u6062\u590d；<\/p>\n<\/li>\n \u6570\u636e\u6e05\u7406；<\/p>\n<\/li>\n \u6743\u9650\u63a7\u5236；<\/p>\n<\/li>\n \u76d1\u63a7\u544a\u8b66\u3002<\/p>\n<\/li>\n<\/ul>\n \u5047\u8bbe\u540c\u4e00\u4e2a thread_id \u540c\u65f6\u6536\u5230\u4e24\u4e2a\u8bf7\u6c42：<\/p>\n \u8bf7\u6c42 A：\u7528\u6237\u4e0a\u4f20\u4e86\u4e00\u4efd\u5408\u540c \u5982\u679c\u4e24\u4e2a\u8bf7\u6c42\u540c\u65f6\u6062\u590d\u540c\u4e00\u4e2a\u65e7\u7248\u672c，\u518d\u5404\u81ea\u5199\u56de\u65b0\u72b6\u6001，\u5c31\u53ef\u80fd\u4ea7\u751f\u5e76\u53d1\u51b2\u7a81\u3002<\/p>\n \u5e38\u89c1\u89e3\u51b3\u65b9\u5f0f\u5305\u62ec：<\/p>\n \u540c\u4e00 thread_id \u4e32\u884c\u6267\u884c；<\/p>\n<\/li>\n \u4f7f\u7528\u5206\u5e03\u5f0f\u9501；<\/p>\n<\/li>\n \u4f7f\u7528\u4efb\u52a1\u961f\u5217；<\/p>\n<\/li>\n \u4f7f\u7528\u4e50\u89c2\u5e76\u53d1\u63a7\u5236；<\/p>\n<\/li>\n \u68c0\u6d4b Checkpoint \u7248\u672c\u51b2\u7a81\u3002<\/p>\n<\/li>\n<\/ul>\n \u6709\u4e86 Checkpoint \u4e4b\u540e，\u8282\u70b9\u53ef\u80fd\u56e0\u4e3a\u4ee5\u4e0b\u539f\u56e0\u91cd\u65b0\u6267\u884c：<\/p>\n \u6545\u969c\u6062\u590d；<\/p>\n<\/li>\n Retry；<\/p>\n<\/li>\n Replay；<\/p>\n<\/li>\n Time Travel；<\/p>\n<\/li>\n \u4eba\u5de5\u4fee\u6539\u72b6\u6001\u540e\u7eed\u8dd1\u3002<\/p>\n<\/li>\n<\/ul>\n \u7eaf\u8ba1\u7b97\u8282\u70b9\u901a\u5e38\u6ca1\u6709\u95ee\u9898\u3002\u6d89\u53ca\u771f\u5b9e\u526f\u4f5c\u7528\u7684\u8282\u70b9\u9700\u8981\u683c\u5916\u8c28\u614e：<\/p>\n \u652f\u4ed8\u3001\u53d1\u4fe1\u3001\u5efa\u5355\u3001\u5220\u9664\u3001\u53d1\u5e03\u3001\u4fee\u6539\u5916\u90e8\u7cfb\u7edf<\/p>\n \u63a8\u8350\u4e3a\u8fd9\u4e9b\u64cd\u4f5c\u4fdd\u5b58\u4e1a\u52a1\u6267\u884c\u6807\u8bc6，\u907f\u514d\u91cd\u590d\u6267\u884c\u3002<\/p>\n \u672c\u6587\u4e3a\u4e86\u6f14\u793a\u72b6\u6001\u8bb0\u5fc6，\u4f7f\u7528\u4e86：<\/p>\n \u5bc6\u7801\u63d0\u793a：\u84dd\u8272\u7684\u5929\u7a7a<\/p>\n \u8fd9\u53ea\u662f\u6559\u5b66\u793a\u4f8b\u3002\u751f\u4ea7\u73af\u5883\u4e0d\u5e94\u5728\u6d88\u606f\u5386\u53f2\u6216 Checkpoint \u4e2d\u4fdd\u5b58：<\/p>\n \u660e\u6587\u5bc6\u7801；<\/p>\n<\/li>\n API Key；<\/p>\n<\/li>\n Access Token；<\/p>\n<\/li>\n \u79c1\u94a5；<\/p>\n<\/li>\n \u5b8c\u6574\u652f\u4ed8\u4fe1\u606f；<\/p>\n<\/li>\n \u4e0d\u5fc5\u8981\u7684\u8eab\u4efd\u8bc1\u660e\u6570\u636e\u3002<\/p>\n<\/li>\n<\/ul>\n \u9700\u8981\u4fdd\u5b58\u7684\u654f\u611f\u5b57\u6bb5\u5e94\u8fdb\u884c：<\/p>\n \u6700\u5c0f\u5316\u91c7\u96c6；<\/p>\n<\/li>\n \u8131\u654f；<\/p>\n<\/li>\n \u52a0\u5bc6；<\/p>\n<\/li>\n \u6743\u9650\u9694\u79bb；<\/p>\n<\/li>\n \u751f\u547d\u5468\u671f\u7ba1\u7406；<\/p>\n<\/li>\n \u5ba1\u8ba1\u8bb0\u5f55\u3002<\/p>\n<\/li>\n<\/ul>\n \u5efa\u8bae\u5728\u65e5\u5fd7\u548c\u94fe\u8def\u8ffd\u8e2a\u4e2d\u8bb0\u5f55：<\/p>\n thread_id \u4f46\u4e0d\u8981\u76f4\u63a5\u5c06\u5b8c\u6574\u6d88\u606f\u6216\u654f\u611f State \u65e0\u9650\u5236\u8f93\u51fa\u5230\u65e5\u5fd7\u3002<\/p>\n \u6700\u91cd\u8981\u7684\u56db\u4e2a\u7ed3\u8bba\u662f：<\/p>\n compile(checkpointer=…) \u4e3a Graph \u63a5\u5165\u72b6\u6001\u4fdd\u5b58\u540e\u7aef\u3002<\/p>\n<\/li>\n thread_id \u51b3\u5b9a\u72b6\u6001\u5c5e\u4e8e\u54ea\u6761\u7ebf\u7a0b\u3002<\/p>\n<\/li>\n Reducer \u51b3\u5b9a\u65b0\u8f93\u5165\u5982\u4f55\u4e0e\u65e7\u72b6\u6001\u5408\u5e76\u3002<\/p>\n<\/li>\n MemorySaver \u53ea\u80fd\u5728\u5f53\u524d\u8fdb\u7a0b\u5b58\u6d3b\u671f\u95f4\u4fdd\u5b58\u6570\u636e\u3002<\/p>\n<\/li>\n \u8fd9\u4e00\u7bc7，\u6211\u4eec\u7528 MemorySaver \u7ed9 LangGraph Agent \u63a5\u5165\u4e86\u6700\u57fa\u7840\u7684 Checkpoint \u80fd\u529b\u3002<\/p>\n \u5b83\u5e26\u6765\u7684\u4e0d\u53ea\u662f\u201c\u8bb0\u4f4f\u804a\u5929\u8bb0\u5f55\u201d，\u800c\u662f\u5b8c\u6574\u7684\u7ebf\u7a0b\u7ea7\u72b6\u6001\u7ba1\u7406：<\/p>\n compile(checkpointer=…) \u540c\u65f6，\u4e5f\u8981\u7262\u7262\u8bb0\u4f4f\u5b83\u7684\u80fd\u529b\u8fb9\u754c：<\/p>\n MemorySaver \u80fd\u8ba9\u65b0\u7f16\u8bd1\u7684 app \u4ece\u540c\u4e00\u4e2a\u5185\u5b58\u540e\u7aef\u6062\u590d\u72b6\u6001，\u4f46\u65e0\u6cd5\u5728 Python \u8fdb\u7a0b\u771f\u6b63\u9000\u51fa\u540e\u4fdd\u7559\u6570\u636e\u3002<\/span><\/p>\n \u56e0\u6b64，\u5b83\u6700\u9002\u5408\u7528\u6765\u5b66\u4e60 Checkpoint \u7684\u5de5\u4f5c\u65b9\u5f0f，\u800c\u4e0d\u662f\u76f4\u63a5\u4f5c\u4e3a\u751f\u4ea7\u6301\u4e45\u5316\u65b9\u6848\u3002<\/p>\n \u4e0b\u4e00\u7bc7\u8fdb\u5165 Redis Persistence：\u628a Checkpoint \u4ece Python \u5185\u5b58\u8fc1\u79fb\u5230\u5916\u90e8\u5b58\u50a8，\u5b9e\u73b0\u771f\u6b63\u7684\u8de8\u8fdb\u7a0b\u6062\u590d，\u5e76\u8fdb\u4e00\u6b65\u8ba8\u8bba\u8fde\u63a5\u5931\u8d25\u65f6\u7684\u964d\u7ea7\u7b56\u7565\u3001\u751f\u4ea7\u914d\u7f6e\u548c\u72b6\u6001\u6cbb\u7406\u3002<\/p>\n checkpointer = MemorySaver()<\/p>\n app = graph.compile(checkpointer=checkpointer)<\/p>\n config = { result = app.invoke( latest_state = app.get_state(config)<\/p>\n history = app.get_state_history(config)<\/p>\n MemorySaver \u2192 \u5f53\u524d\u8fdb\u7a0b\u5185\u4fdd\u5b58 \u00a0\u7cfb\u5217\u5bfc\u822a：LangGraph\u4ece\u96f6\u6784\u5efa\u751f\u4ea7\u7ea7 AI Agent \u5e73\u53f0\u7684\u9012\u8fdb\u5f0f\u5b66\u4e60\u9879\u76ee-CSDN\u535a\u5ba2<\/span><\/p><\/p>\n","protected":false},"excerpt":{"rendered":" \u76ee\u5f55\u4e8c\u3001\u5148\u5efa\u7acb\u6b63\u786e\u7684\u5fc3\u667a\u6a21\u578b<\/h2>\n
\n messages: Annotated[list[BaseMessage], add_messages]
\n turn_count: int<\/p>\n\n
\n1. MemorySaver：\u7eaf\u5185\u5b58\u7684 Checkpoint \u540e\u7aef
\n2. Thread ID：\u7ebf\u7a0b\u9694\u79bb，\u4e0d\u540c\u5bf9\u8bdd\u4e92\u4e0d\u5e72\u6270
\n3. \u72b6\u6001\u6062\u590d：\u4e2d\u65ad\u540e\u4ece\u6700\u8fd1\u4e00\u6b21 Checkpoint \u6062\u590d\u6267\u884c<\/p>\n
\n python stages\/stage3_memory\/02_checkpoint_basics\/main.py
\n"""<\/p>\n
\nfrom pathlib import Path
\nfrom typing import Annotated, TypedDict<\/p>\n
\nfrom langgraph.checkpoint.memory import MemorySaver
\nfrom langgraph.graph import END, START, StateGraph
\nfrom langgraph.graph.message import add_messages<\/p>\n
\n messages: Annotated[list[BaseMessage], add_messages]
\n turn_count: int<\/p>\n
\n """\u6784\u5efa\u5e26 Checkpoint \u652f\u6301\u7684\u5bf9\u8bdd\u56fe\u3002"""
\n llm = get_llm(fallback_to_mock=False)<\/p>\n
\n log_step(logger, "chat_node", f"\u7b2c {state.get('turn_count', 0) + 1} \u8f6e\u5bf9\u8bdd")
\n response = llm.invoke(state["messages"])
\n return {
\n "messages": [response],
\n "turn_count": state.get("turn_count", 0) + 1,
\n }<\/p>\n
\n graph.add_node("chat", chat_node)
\n graph.add_edge(START, "chat")
\n graph.add_edge("chat", END)
\n return graph<\/p>\n
\n# \u6f14\u793a 1：\u57fa\u672c Checkpoint \u4f7f\u7528
\n# ============================================================
\ndef demo_basic_checkpoint():
\n """\u6f14\u793a MemorySaver \u7684\u57fa\u672c\u7528\u6cd5\u3002"""
\n print("\\\\n— \u6f14\u793a 1: MemorySaver \u57fa\u672c\u7528\u6cd5 —\\\\n")<\/p>\n
\n graph = build_checkpoint_graph()
\n app = graph.compile(checkpointer=checkpointer)<\/p>\n
\n "\u4f60\u597d，\u6211\u53eb\u674e\u660e",
\n "\u6211\u662f\u4e00\u540d Python \u5f00\u53d1\u8005",
\n "\u4f60\u8fd8\u8bb0\u5f97\u6211\u53eb\u4ec0\u4e48\u5417？",
\n ]<\/p>\n
\n for user_msg in conversations:
\n print(f" \u7528\u6237: {user_msg}")
\n result = app.invoke(
\n {"messages": [HumanMessage(content=user_msg)], "turn_count": 0},
\n config=config,
\n )
\n ai_msg = result["messages"][-1]
\n print(f" \u52a9\u624b: {ai_msg.content}")
\n print()
\n results.append(result)<\/p>\n
\n print(" Checkpoint \u72b6\u6001:")
\n print(f" \u6d88\u606f\u6570\u91cf: {len(snapshot.values.get('messages', []))}")
\n print(f" \u5bf9\u8bdd\u8f6e\u6b21: {snapshot.values.get('turn_count', 'N\/A')}")
\n print()<\/p>\n
\n# \u6f14\u793a 2：Thread ID \u9694\u79bb
\n# ============================================================
\ndef demo_thread_isolation():
\n """\u6f14\u793a\u4e0d\u540c thread_id \u4e4b\u95f4\u7684\u72b6\u6001\u9694\u79bb\u3002"""
\n print("\\\\n— \u6f14\u793a 2: Thread ID \u9694\u79bb —\\\\n")<\/p>\n
\n graph = build_checkpoint_graph()
\n app = graph.compile(checkpointer=checkpointer)<\/p>\n
\n config_bob = {"configurable": {"thread_id": "user-bob"}}<\/p>\n
\n app.invoke(
\n {"messages": [HumanMessage(content="\u6211\u53eb Alice，\u6211\u559c\u6b22\u732b")], "turn_count": 0},
\n config=config_alice,
\n )
\n print(" Alice: \u6211\u53eb Alice，\u6211\u559c\u6b22\u732b")<\/p>\n
\n app.invoke(
\n {"messages": [HumanMessage(content="\u6211\u53eb Bob，\u6211\u559c\u6b22\u72d7")], "turn_count": 0},
\n config=config_bob,
\n )
\n print(" Bob: \u6211\u53eb Bob，\u6211\u559c\u6b22\u72d7")<\/p>\n
\n alice_state = app.get_state(config_alice)
\n bob_state = app.get_state(config_bob)<\/p>\n
\n bob_msgs = bob_state.values.get("messages", [])<\/p>\n
\n print(f" Bob \u6d88\u606f\u6570: {len(bob_msgs)}")<\/p>\n
\n bob_has_bob = any("Bob" in str(m.content) or "bob" in str(m.content) for m in bob_msgs)
\n print(f" Alice \u5bf9\u8bdd\u5305\u542b 'Alice': {alice_has_alice}")
\n print(f" Bob \u5bf9\u8bdd\u5305\u542b 'Bob': {bob_has_bob}")
\n print()<\/p>\n
\n "alice_msg_count": len(alice_msgs),
\n "bob_msg_count": len(bob_msgs),
\n "isolation_verified": True,
\n }<\/p>\n
\n# \u6f14\u793a 3：\u72b6\u6001\u6062\u590d
\n# ============================================================
\ndef demo_state_recovery():
\n """\u6f14\u793a\u4ece Checkpoint \u6062\u590d\u72b6\u6001\u3002"""
\n print("\\\\n— \u6f14\u793a 3: \u72b6\u6001\u6062\u590d —\\\\n")<\/p>\n
\n graph = build_checkpoint_graph()<\/p>\n
\n app1 = graph.compile(checkpointer=checkpointer)<\/p>\n
\n {"messages": [HumanMessage(content="\u8bb0\u4f4f：\u6211\u7684\u5bc6\u7801\u63d0\u793a\u662f'\u84dd\u8272\u7684\u5929\u7a7a'")], "turn_count": 0},
\n config=config,
\n )
\n app1.invoke(
\n {"messages": [HumanMessage(content="\u6211\u6700\u559c\u6b22\u7684\u7f16\u7a0b\u8bed\u8a00\u662f Rust")], "turn_count": 0},
\n config=config,
\n )
\n print(" \u9636\u6bb5 1: \u5df2\u5199\u5165 2 \u8f6e\u5bf9\u8bdd")<\/p>\n
\n msg_count_before = len(state_before.values.get("messages", []))
\n print(f" Checkpoint \u4e2d\u6d88\u606f\u6570: {msg_count_before}")<\/p>\n
\n app2 = graph.compile(checkpointer=checkpointer)<\/p>\n
\n msg_count_after = len(state_after.values.get("messages", []))
\n print(f" \u6062\u590d\u540e\u6d88\u606f\u6570: {msg_count_after}")<\/p>\n
\n {"messages": [HumanMessage(content="\u6211\u6700\u559c\u6b22\u4ec0\u4e48\u7f16\u7a0b\u8bed\u8a00？")], "turn_count": 0},
\n config=config,
\n )
\n final_msg = result["messages"][-1]
\n print(" \u7528\u6237: \u6211\u6700\u559c\u6b22\u4ec0\u4e48\u7f16\u7a0b\u8bed\u8a00？")
\n print(f" \u52a9\u624b: {final_msg.content}")<\/p>\n
\n print()<\/p>\n
\n "msg_count_before": msg_count_before,
\n "msg_count_after": msg_count_after,
\n "recovery_success": msg_count_after == msg_count_before,
\n }<\/p>\n
\n# \u6f14\u793a 4：\u67e5\u770b Checkpoint \u5386\u53f2
\n# ============================================================
\ndef demo_checkpoint_history():
\n """\u6f14\u793a\u67e5\u770b Checkpoint \u7684\u5386\u53f2\u7248\u672c\u3002"""
\n print("\\\\n— \u6f14\u793a 4: Checkpoint \u5386\u53f2\u7248\u672c —\\\\n")<\/p>\n
\n graph = build_checkpoint_graph()
\n app = graph.compile(checkpointer=checkpointer)<\/p>\n
\n for step in steps:
\n app.invoke(
\n {"messages": [HumanMessage(content=f"\u8fd9\u662f{step}")], "turn_count": 0},
\n config=config,
\n )<\/p>\n
\n history_count = 0
\n for state in app.get_state_history(config):
\n history_count += 1
\n msg_count = len(state.values.get("messages", []))
\n ts = state.config.get("configurable", {}).get("checkpoint_id", "N\/A")
\n print(f" \u7248\u672c {history_count}: {msg_count} \u6761\u6d88\u606f, checkpoint_id={ts[:20]}…")
\n if history_count >= 6:
\n print(" … (\u66f4\u591a\u5386\u53f2\u7701\u7565)")
\n break<\/p>\n
\n print()<\/p>\n
\n """\u8fd0\u884c Checkpoint Basics \u5168\u90e8\u6f14\u793a\u3002"""
\n print("=" * 60)
\n print(" Demo 02: Checkpoint Basics \u2014 \u72b6\u6001\u6301\u4e45\u5316\u57fa\u7840")
\n print("=" * 60)<\/p>\n
\n isolation = demo_thread_isolation()
\n recovery = demo_state_recovery()
\n history = demo_checkpoint_history()<\/p>\n
\n print("=" * 60)
\n print(" \u5173\u952e\u6982\u5ff5\u56de\u987e")
\n print("=" * 60)
\n print(" 1. MemorySaver : LangGraph \u5185\u7f6e\u7684\u7eaf\u5185\u5b58 Checkpoint \u540e\u7aef")
\n print(" 2. thread_id : \u901a\u8fc7 config \u4f20\u5165，\u5b9e\u73b0\u5bf9\u8bdd\u7ebf\u7a0b\u9694\u79bb")
\n print(" 3. \u72b6\u6001\u6062\u590d : \u540c\u4e00 thread_id \u81ea\u52a8\u4ece\u6700\u8fd1 Checkpoint \u6062\u590d")
\n print(" 4. \u5386\u53f2\u7248\u672c : \u6bcf\u6b21 invoke \u90fd\u4f1a\u521b\u5efa\u65b0\u7684 Checkpoint \u7248\u672c")
\n print(" 5. get_state() : \u67e5\u770b\u5f53\u524d\u7ebf\u7a0b\u7684\u6700\u65b0\u72b6\u6001")
\n print(" 6. get_state_history(): \u67e5\u770b\u6240\u6709\u5386\u53f2 Checkpoint")
\n print()<\/p>\n
\n "basic": basic,
\n "isolation": isolation,
\n "recovery": recovery,
\n "history": history,
\n }<\/p>\n
\n run_demo()<\/p>\n\u4e09\u3001Checkpoint\u3001Thread \u4e0e\u7248\u672c\u94fe<\/h2>\n
（\u4e00）Checkpointer：\u72b6\u6001\u4fdd\u5b58\u540e\u7aef<\/h3>\n
\n
（\u4e8c）Thread ID：\u4e00\u6761\u72b6\u6001\u94fe\u7684\u4e1a\u52a1\u6807\u8bc6<\/h3>\n
\n
（\u4e09）Checkpoint \u7248\u672c\u94fe：\u72b6\u6001\u4e0d\u53ea\u6709\u201c\u73b0\u5728\u201d<\/h3>\n
\n \u2193
\ncheckpoint_2
\n \u2193
\ncheckpoint_3
\n \u2193
\ncheckpoint_4<\/p>\n\n
（\u56db）\u4e00\u6b21 invoke \u5230\u5e95\u53d1\u751f\u4e86\u4ec0\u4e48？<\/h3>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260805005008-6a7288c04764f.png\")
<\/p>\n\n
\n messages: Annotated[list[BaseMessage], add_messages]
\n turn_count: int<\/p>\n\u56db\u3001\u4ee3\u7801\u6f14\u793a\u8be6\u7ec6\u8bf4\u660e<\/h2>\n
（\u4e00）\u4ee3\u7801\u7ed3\u6784\u5206\u6790<\/h3>\n
\n """\u6784\u5efa\u5e26 Checkpoint \u652f\u6301\u7684\u5bf9\u8bdd\u56fe\u3002"""
\n llm = get_llm(fallback_to_mock=False)<\/p>\n
\n log_step(logger, "chat_node", f"\u7b2c {state.get('turn_count', 0) + 1} \u8f6e\u5bf9\u8bdd")
\n response = llm.invoke(state["messages"])
\n return {
\n "messages": [response],
\n "turn_count": state.get("turn_count", 0) + 1,
\n }<\/p>\n
\n graph.add_node("chat", chat_node)
\n graph.add_edge(START, "chat")
\n graph.add_edge("chat", END)
\n return graph<\/p>\n
\ngraph = build_checkpoint_graph()
\napp = graph.compile(checkpointer=checkpointer)<\/p>\n
\n \u251c\u2500\u2500 compile(checkpointer=MemorySaver)
\n \u251c\u2500\u2500 compile(checkpointer=SQLite Saver)
\n \u251c\u2500\u2500 compile(checkpointer=PostgreSQL Saver)
\n \u2514\u2500\u2500 compile(checkpointer=Redis Saver)<\/p>\n（\u4e8c）\u8be6\u7ec6\u6f14\u793a\u8bf4\u660e\u5206\u6790<\/h3>\n
1. \u6f14\u793a 1：MemorySaver \u57fa\u672c\u7528\u6cd5<\/h4>\n
\n "\u4f60\u597d，\u6211\u53eb\u674e\u660e",
\n "\u6211\u662f\u4e00\u540d Python \u5f00\u53d1\u8005",
\n "\u4f60\u8fd8\u8bb0\u5f97\u6211\u53eb\u4ec0\u4e48\u5417？",
\n]<\/p>\n
\n {"messages": [HumanMessage(content=user_msg)], "turn_count": 0},
\n config=config,
\n)<\/p>\n\n
\u8c03\u7528\u65b0\u589e Human \u6d88\u606f\u65b0\u589e AI \u6d88\u606f\u6700\u7ec8\u6d88\u606f\u6570<\/tr>\n \n\n \u7b2c 1 \u6b21<\/td>\n 1<\/td>\n 1<\/td>\n 2<\/td>\n<\/tr>\n \n \u7b2c 2 \u6b21<\/td>\n 1<\/td>\n 1<\/td>\n 4<\/td>\n<\/tr>\n \n \u7b2c 3 \u6b21<\/td>\n 1<\/td>\n 1<\/td>\n 6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\nAI: \u4f60\u597d，\u674e\u660e\u2026\u2026
\nHuman: \u6211\u662f\u4e00\u540d Python \u5f00\u53d1\u8005
\nAI: \u5f88\u9ad8\u5174\u8ba4\u8bc6\u4f60\u2026\u2026
\nHuman: \u4f60\u8fd8\u8bb0\u5f97\u6211\u53eb\u4ec0\u4e48\u5417？<\/p>\n
\n \u6d88\u606f\u6570\u91cf: 6
\n \u5bf9\u8bdd\u8f6e\u6b21: 1<\/p>\n\u4e3a\u4ec0\u4e48 turn_count \u662f 1，\u800c\u4e0d\u662f 3？<\/h5>\n
\n \u2193
\n\u672c\u6b21\u8f93\u5165\u8986\u76d6：turn_count = 0
\n \u2193
\nchat_node \u52a0\u4e00：turn_count = 1<\/p>\n2. \u6f14\u793a 2：Thread ID \u9694\u79bb<\/h4>\n
\nconfig_bob = {"configurable": {"thread_id": "user-bob"}}<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260805005008-6a7288c0f158d.png\")
<\/p>\n
\nbob_state = app.get_state(config_bob)<\/p>\n
\nBob \u6d88\u606f\u6570: 2
\nAlice \u5bf9\u8bdd\u5305\u542b 'Alice': True
\nBob \u5bf9\u8bdd\u5305\u542b 'Bob': True<\/p>\n
\n1 \u6761 AIMessage<\/p>\n\u7ebf\u4e0a\u73af\u5883\u5e94\u8be5\u5982\u4f55\u8bbe\u8ba1 thread_id？<\/h5>\n
\n
\nu1001:conversation-002
\nu2048:conversation-001<\/p>\n3. \u6f14\u793a 3：\u72b6\u6001\u6062\u590d<\/h4>\n
\n {"messages": [HumanMessage(content="\u8bb0\u4f4f：\u6211\u7684\u5bc6\u7801\u63d0\u793a\u662f'\u84dd\u8272\u7684\u5929\u7a7a'")], "turn_count": 0},
\n config=config,
\n)
\napp1.invoke(
\n {"messages": [HumanMessage(content="\u6211\u6700\u559c\u6b22\u7684\u7f16\u7a0b\u8bed\u8a00\u662f Rust")], "turn_count": 0},
\n config=config,
\n)<\/p>\n
\nAI：\u2026\u2026
\nHuman：\u6211\u6700\u559c\u6b22\u7684\u7f16\u7a0b\u8bed\u8a00\u662f Rust
\nAI：\u2026\u2026<\/p>\n
\n {"messages": [HumanMessage(content="\u6211\u6700\u559c\u6b22\u4ec0\u4e48\u7f16\u7a0b\u8bed\u8a00？")], "turn_count": 0},
\n config=config,
\n)<\/p>\n![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260805005009-6a7288c1a905f.png\")
<\/p>\n\u4e00\u4e2a\u5fc5\u987b\u8bb2\u6e05\u695a\u7684\u7ec6\u8282<\/h5>\n
\n \u2193
\nMemorySaver \u5bf9\u8c61\u9500\u6bc1
\n \u2193
\n\u6240\u6709\u5185\u5b58 Checkpoint \u6d88\u5931<\/p>\n4. \u6f14\u793a 4：\u67e5\u770b Checkpoint \u5386\u53f2<\/h4>\n
\nfor step in steps:
\n app.invoke(
\n {"messages": [HumanMessage(content=f"\u8fd9\u662f{step}")], "turn_count": 0},
\n config=config,
\n )<\/p>\n
\n history_count += 1
\n msg_count = len(state.values.get("messages", []))
\n ts = state.config.get("configurable", {}).get("checkpoint_id", "N\/A")
\n print(f" \u7248\u672c {history_count}: {msg_count} \u6761\u6d88\u606f, checkpoint_id={ts[:20]}…")<\/p>\n
\n\u7248\u672c 2: 5 \u6761\u6d88\u606f
\n\u7248\u672c 3: 4 \u6761\u6d88\u606f
\n\u7248\u672c 4: 4 \u6761\u6d88\u606f
\n\u7248\u672c 5: 3 \u6761\u6d88\u606f
\n\u7248\u672c 6: 2 \u6761\u6d88\u606f<\/p>\n\u4e3a\u4ec0\u4e48\u4e09\u6b21 invoke \u4f1a\u6709\u516d\u4e2a\u4ee5\u4e0a\u7684\u7248\u672c？<\/h5>\n
\n \u2193
\nchat \u8282\u70b9\u6267\u884c\u5b8c\u6210<\/p>\n
\n6 \u6761\u6d88\u606f：chat_node \u5df2\u5b8c\u6210，AIMessage \u5df2\u5199\u5165<\/p>\n\n
\u5386\u53f2\u987a\u5e8f\u4e5f\u8981\u6ce8\u610f<\/h5>\n
\n \u2193
\n\u66f4\u65e9\u7684 Checkpoint
\n \u2193
\n\u6700\u521d\u7684 Checkpoint<\/p>\n（\u4e09）\u4ece\u5386\u53f2 Checkpoint \u6062\u590d，\u4e0d\u7b49\u4e8e\u8bfb\u53d6\u7f13\u5b58<\/h3>\n
1. \u67e5\u770b\u5386\u53f2\u72b6\u6001<\/h4>\n
2. \u4ece\u5386\u53f2\u72b6\u6001\u91cd\u65b0\u6267\u884c<\/h4>\n
\n
\n\u53d1\u9001\u90ae\u4ef6
\n\u521b\u5efa\u8ba2\u5355
\n\u5220\u9664\u6570\u636e
\n\u8c03\u7528\u4e0d\u53ef\u9006\u7684\u7b2c\u4e09\u65b9\u63a5\u53e3<\/p>\n\u4e94\u3001Checkpoint \u4e0e Store \u4e0d\u8981\u6df7\u4e3a\u4e00\u8c08<\/h2>\n
\n
\u7ef4\u5ea6CheckpointerStore<\/tr>\n \n\n \u4fdd\u5b58\u5185\u5bb9<\/td>\n Graph State \u5feb\u7167<\/td>\n \u5e94\u7528\u5b9a\u4e49\u7684\u6570\u636e<\/td>\n<\/tr>\n \n \u4f5c\u7528\u8303\u56f4<\/td>\n \u5355\u4e2a thread<\/td>\n \u53ef\u8de8 thread<\/td>\n<\/tr>\n \n \u5e38\u89c1\u6570\u636e<\/td>\n \u6d88\u606f\u3001\u8282\u70b9\u72b6\u6001\u3001\u6267\u884c\u8fdb\u5ea6<\/td>\n \u7528\u6237\u504f\u597d\u3001\u957f\u671f\u4e8b\u5b9e\u3001\u77e5\u8bc6\u6761\u76ee<\/td>\n<\/tr>\n \n \u4e3b\u8981\u7528\u9014<\/td>\n \u591a\u8f6e\u5bf9\u8bdd\u3001\u6062\u590d\u3001\u56de\u6eaf\u3001\u6545\u969c\u7eed\u8dd1<\/td>\n \u957f\u671f\u8bb0\u5fc6\u3001\u7528\u6237\u753b\u50cf\u3001\u5171\u4eab\u77e5\u8bc6<\/td>\n<\/tr>\n \n \u8bbf\u95ee\u65b9\u5f0f<\/td>\n \u5728 config \u4e2d\u4f20\u5165 thread_id<\/td>\n \u901a\u8fc7\u547d\u540d\u7a7a\u95f4\u548c key \u8bfb\u5199<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u516d\u3001\u5e38\u89c1\u95ee\u9898\u6392\u67e5\u8bf4\u660e\u53ca\u7ebf\u4e0a\u8003\u8651\u57fa\u672c\u70b9\u8bf4\u660e<\/h2>\n
（\u4e00）\u5e38\u89c1\u95ee\u9898\u4e0e\u6392\u67e5\u65b9\u5f0f<\/h3>\n
1. \u95ee\u9898 1：\u5fd8\u8bb0\u4f20\u5165 thread_id<\/h4>\n
\n "configurable": {
\n "thread_id": "some-thread-id"
\n }
\n}<\/p>\n2. \u95ee\u9898 2：\u670d\u52a1\u91cd\u542f\u540e MemorySaver \u72b6\u6001\u6d88\u5931<\/h4>\n
3. \u95ee\u9898 3：\u4e0d\u540c\u7528\u6237\u7684\u5bf9\u8bdd\u53d1\u751f\u4e32\u53f0<\/h4>\n
4. \u95ee\u9898 4：\u6d88\u606f\u80fd\u591f\u7d2f\u79ef，\u666e\u901a\u5b57\u6bb5\u5374\u6ca1\u6709\u7d2f\u79ef<\/h4>\n
5. \u95ee\u9898 5：\u4fee\u6539 State \u540e，\u65e7 Checkpoint \u51fa\u73b0\u517c\u5bb9\u95ee\u9898<\/h4>\n
\nmessages
\nturn_count<\/p>\n
\nmessages
\nturn_count
\nuser_profile
\nworkflow_status<\/p>\n\n
6. \u95ee\u9898 6：Checkpoint \u8d8a\u79ef\u8d8a\u591a<\/h4>\n
\u88c1\u526a\u6a21\u578b\u4e0a\u4e0b\u6587<\/h5>\n
\u6e05\u7406 Checkpoint \u5386\u53f2<\/h5>\n
\n
（\u4e8c）\u751f\u4ea7\u73af\u5883\u8fd8\u9700\u8981\u8003\u8651\u4ec0\u4e48？<\/h3>\n
1. \u6301\u4e45\u5316\u540e\u7aef<\/h4>\n
\n
2. \u540c\u4e00\u7ebf\u7a0b\u7684\u5e76\u53d1\u8c03\u7528<\/h4>\n
\n\u8bf7\u6c42 B：\u7528\u6237\u8be2\u95ee\u4e0a\u4e00\u4efd\u5408\u540c\u7684\u7ed3\u8bba<\/p>\n\n
3. \u8282\u70b9\u5e42\u7b49\u6027<\/h4>\n
\n
4. \u654f\u611f\u6570\u636e\u4fdd\u62a4<\/h4>\n
\n
\n
5. \u53ef\u89c2\u6d4b\u6027<\/h4>\n
\ncheckpoint_id
\ncheckpoint_ns
\n\u6267\u884c\u8282\u70b9
\n\u6062\u590d\u6765\u6e90
\n\u5199\u5165\u8017\u65f6
\n\u72b6\u6001\u5927\u5c0f
\n\u5386\u53f2\u7248\u672c\u6570\u91cf<\/p>\n\u4e03\u3001\u5982\u4f55\u8bfb\u61c2\u672c\u6b21 Demo \u7684\u56db\u4e2a\u7ed3\u679c？<\/h2>\n
\n
\u6f14\u793a\u8bc1\u660e\u4e86\u4ec0\u4e48\u6ca1\u6709\u8bc1\u660e\u4ec0\u4e48<\/tr>\n \n\n \u57fa\u672c Checkpoint<\/td>\n \u540c\u4e00\u7ebf\u7a0b\u7684\u6d88\u606f\u53ef\u4ee5\u6301\u7eed\u7d2f\u79ef<\/td>\n \u666e\u901a\u5b57\u6bb5\u4f1a\u81ea\u52a8\u7d2f\u52a0<\/td>\n<\/tr>\n \n Thread ID \u9694\u79bb<\/td>\n \u4e0d\u540c\u7ebf\u7a0b\u7684\u72b6\u6001\u4e92\u4e0d\u5e72\u6270<\/td>\n thread_id \u81ea\u52a8\u63d0\u4f9b\u8bbf\u95ee\u63a7\u5236<\/td>\n<\/tr>\n \n \u72b6\u6001\u6062\u590d<\/td>\n \u65b0 app \u53ef\u4ece\u540c\u4e00\u4e2a Checkpointer \u6062\u590d<\/td>\n MemorySaver \u80fd\u8de8\u8fdb\u7a0b\u91cd\u542f<\/td>\n<\/tr>\n \n \u5386\u53f2\u7248\u672c<\/td>\n \u53ef\u4ee5\u67e5\u770b\u591a\u4e2a StateSnapshot<\/td>\n \u6bcf\u6b21 invoke \u53ea\u4ea7\u751f\u4e00\u4e2a\u7248\u672c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n ![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260805005010-6a7288c25dcd5.png\")
<\/p>\n\u516b\u3001\u603b\u7ed3<\/h2>\n
\n \u2193
\n\u4fdd\u5b58 Graph State
\n \u2193
\nthread_id \u9694\u79bb\u7ebf\u7a0b
\n \u2193
\n\u540e\u7eed invoke \u81ea\u52a8\u6062\u590d
\n \u2193
\nget_state \u67e5\u770b\u6700\u65b0\u72b6\u6001
\n \u2193
\nget_state_history \u67e5\u770b\u5386\u53f2\u7248\u672c<\/p>\n\u4e00\u9875\u901f\u67e5<\/h2>\n
\n "configurable": {
\n "thread_id": "user-id:conversation-id"
\n }
\n}<\/p>\n
\n {"messages": [HumanMessage(content="\u4f60\u597d")], "turn_count": 0},
\n config=config,
\n)<\/p>\n
\nthread_id \u2192 \u7ebf\u7a0b\u9694\u79bb\u4e0e\u72b6\u6001\u5b9a\u4f4d
\nget_state \u2192 \u8bfb\u53d6\u6700\u65b0 StateSnapshot
\nget_state_history \u2192 \u67e5\u770b\u5386\u53f2\u7248\u672c\u94fe
\nReducer \u2192 \u51b3\u5b9a\u72b6\u6001\u5982\u4f55\u5408\u5e76
\n\u6301\u4e45\u5316 Checkpointer \u2192 \u5b9e\u73b0\u771f\u6b63\u7684\u8de8\u8fdb\u7a0b\u6062\u590d<\/p>\n
\n\u4e00\u3001\u4e3a\u4ec0\u4e48 Agent \u9700\u8981 Checkpoint？
\n\u4e8c\u3001\u5148\u5efa\u7acb\u6b63\u786e\u7684\u5fc3\u667a\u6a21\u578b
\n\u4e09\u3001Checkpoint\u3001Thread \u4e0e\u7248\u672c\u94fe
\n（\u4e00）Checkpointer：\u72b6\u6001\u4fdd\u5b58\u540e\u7aef
\n（\u4e8c）Thread ID：\u4e00\u6761\u72b6\u6001\u94fe\u7684\u4e1a\u52a1\u6807\u8bc6
\n（\u4e09）Checkpoint \u7248\u672c\u94fe：\u72b6\u6001\u4e0d\u53ea\u6709\u201c\u73b0\u5728\u201d
\n（\u56db）\u4e00\u6b21 <\/p>\n","protected":false},"author":2,"featured_media":90388,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[6401,74,3503,75,50],"topic":[],"class_list":["post-90393","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-checkpoint","tag-agent","tag-langgraph","tag-llm","tag-50"],"yoast_head":"\n