{"id":76442,"date":"2026-02-22T14:17:26","date_gmt":"2026-02-22T06:17:26","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/76442.html"},"modified":"2026-02-22T14:17:26","modified_gmt":"2026-02-22T06:17:26","slug":"%e6%8b%86%e8%a7%a3langchain%e6%89%a7%e8%a1%8c%e5%bc%95%e6%93%8e%e5%9b%9e%e5%88%b0%e8%bf%87%e5%8e%bb%ef%bc%8c%e5%bc%80%e5%90%af%e5%b9%b3%e8%a1%8c%e4%b8%96%e7%95%8c%e4%b8%8b%e7%af%87","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/76442.html","title":{"rendered":"[\u62c6\u89e3LangChain\u6267\u884c\u5f15\u64ce]\u56de\u5230\u8fc7\u53bb\uff0c\u5f00\u542f\u5e73\u884c\u4e16\u754c[\u4e0b\u7bc7]"},"content":{"rendered":"

\u76ee\u524d\u9488\u5bf9update_state\u65b9\u6cd5\u7684\u8c03\u7528\u90fd\u662f\u9488\u5bf9\u6700\u7ec8\u72b6\u6001，\u5982\u679c\u9488\u5bf9\u67d0\u4e2a\u8fc7\u53bb\u7684\u5386\u53f2\u8282\u70b9\u8c03\u7528\u6b64\u65b9\u6cd5，\u5c31\u4f1a\u5728\u5bf9\u5e94\u7684\u5730\u65b9\u5f00\u542f\u4e86\u4e00\u4e2a\u65b0\u7684\u5206\u652f\u3002\u9664\u6b64\u4e4b\u5916，\u6211\u4eec\u8fd8\u53ef\u4ee5\u5229\u7528bulk_update_state\/abulk_update_state\u65b9\u6cd5\u5b9e\u73b0\u6279\u91cf\u72b6\u6001\u66f4\u65b0\u3002<\/p>\n

1. \u4ee5\u5386\u53f2\u8282\u70b9\u540d\u4e49\u4fee\u6539\u72b6\u6001<\/h3>\n

\u5047\u8bbe\u6211\u4eec\u6709\u5982\u4e0a\u7684\u4e00\u4e2a\u8f6c\u8d26\u6d41\u7a0b，\u5b83\u4f1a\u5148\u540e\u6267\u884c\u7684calculate_amount\u548ctransfer\u8fd9\u4e24\u4e2a\u6b65\u9aa4，\u524d\u8005\u6839\u636e\u8f93\u5165\u7684\u94f6\u884c\u8d26\u53f7\u8ba1\u7b97\u5bf9\u5e94\u7684\u8f6c\u8d26\u91d1\u989d，\u540e\u8005\u751f\u6210\u4e00\u4e2a\u4ee3\u8868\u8f6c\u8d26\u4e1a\u52a1\u7684Transaction\u5bf9\u8c61\u3002\u5bf9\u4e8e\u4e00\u4e2a\u5df2\u7ecf\u53d1\u751f\u7684\u8f6c\u8d26\u6d41\u7a0b，\u5982\u679c\u53d1\u73b0\u91d1\u989d\u8ba1\u7b97\u6709\u8bef，\u6211\u4eec\u53ef\u4ee5\u5728\u8282\u70b9calculate_amount\u5904\u5f00\u542f\u4e00\u4e2a\u65b0\u7684\u5206\u652f\u5c06\u91d1\u989d\u6539\u8fc7\u6765，\u7136\u540e\u91cd\u65b0\u9a71\u52a8\u540e\u7eed\u7684\u6d41\u7a0b\u3002<\/p>\n

\u5982\u4e0b\u7684\u7a0b\u5e8f\u6a21\u62df\u4e86\u6b64\u5e94\u7528\u573a\u666f\u3002\u6211\u4eec\u521b\u5efa\u4e86\u4e0a\u8ff0\u7684calculate_amount\u548ctransfer\u8282\u70b9，\u5e76\u7531\u5b83\u4eec\u6784\u5efa\u4e86\u4e00\u4e2aPregel\u5bf9\u8c61\u3002\u8c03\u7528\u8be5\u5bf9\u8c61\u7684\u65f6\u5019\u5411\u8f93\u5165\u901a\u9053from_account \u548c to_account\u8f93\u5165\u8f6c\u8d26\u53cc\u65b9\u7684\u94f6\u884c\u8d26\u53f7，\u5e76\u5229\u7528\u901a\u9053 start \u9a71\u52a8calculate_amount\u3002\u5b83\u5c06\u8f6c\u8d26\u91d1\u989d1,000,000\u5199\u5165 \u901a\u9053 amount ，\u5e76\u7531\u6b64\u9a71\u52a8transfer\u8282\u70b9，\u540e\u8005\u521b\u5efa\u4e00\u4e2a\u4ee3\u8868\u8f6c\u8d26\u4e1a\u52a1\u7684Transaction\u5bf9\u8c61\u5199\u5165\u5bf9\u5e94\u7684Channel\u3002<\/p>\n

from<\/span> langgraph.<\/span>channels import<\/span> LastValue
\nfrom<\/span> typing import<\/span> NamedTuple
\nfrom<\/span> langgraph.<\/span>pregel import<\/span> Pregel,<\/span> NodeBuilder
\nfrom<\/span> langgraph.<\/span>checkpoint.<\/span>memory import<\/span> InMemorySaver
\nimport<\/span> json<\/p>\n

class<\/span> Transaction<\/span>(<\/span>NamedTuple)<\/span>:<\/span>
\n from_account:<\/span> str<\/span>
\n to_account:<\/span> str<\/span>
\n amount:<\/span> float<\/span><\/p>\n

calculate_amount =<\/span> (<\/span>
\n NodeBuilder(<\/span>)<\/span>
\n .<\/span>subscribe_to(<\/span>"start"<\/span>,<\/span> read=<\/span>False<\/span>)<\/span>
\n .<\/span>read_from(<\/span>"from_account"<\/span>,<\/span> "to_account"<\/span>)<\/span>
\n .<\/span>do(<\/span>lambda<\/span> _<\/span>:<\/span> 1_000_000.00<\/span>)<\/span>
\n .<\/span>write_to(<\/span>"amount"<\/span>)<\/span>
\n)<\/span><\/p>\n

transfer =<\/span> (<\/span>
\n NodeBuilder(<\/span>)<\/span>
\n .<\/span>subscribe_to(<\/span>"amount"<\/span>)<\/span>
\n .<\/span>read_from(<\/span>"from_account"<\/span>,<\/span> "to_account"<\/span>)<\/span>
\n .<\/span>do(<\/span>
\n lambda<\/span> args:<\/span> Transaction(<\/span>
\n args[<\/span>"from_account"<\/span>]<\/span>,<\/span> args[<\/span>"to_account"<\/span>]<\/span>,<\/span> args[<\/span>"amount"<\/span>]<\/span>
\n )<\/span>
\n )<\/span>
\n .<\/span>write_to(<\/span>"transaction"<\/span>)<\/span>
\n)<\/span><\/p>\n

app =<\/span> Pregel(<\/span>
\n nodes=<\/span>{<\/span>"calculate_amount"<\/span>:<\/span> calculate_amount,<\/span> "transfer"<\/span>:<\/span> transfer}<\/span>,<\/span>
\n channels=<\/span>{<\/span>
\n "start"<\/span>:<\/span> LastValue(<\/span>None<\/span>)<\/span>,<\/span>
\n "from_account"<\/span>:<\/span> LastValue(<\/span>str<\/span>)<\/span>,<\/span>
\n "to_account"<\/span>:<\/span> LastValue(<\/span>str<\/span>)<\/span>,<\/span>
\n "amount"<\/span>:<\/span> LastValue(<\/span>float<\/span>)<\/span>,<\/span>
\n "transaction"<\/span>:<\/span> LastValue(<\/span>Transaction)<\/span>,<\/span>
\n }<\/span>,<\/span>
\n input_channels=<\/span>[<\/span>"start"<\/span>,<\/span> "from_account"<\/span>,<\/span> "to_account"<\/span>]<\/span>,<\/span>
\n output_channels=<\/span>[<\/span>"from_account"<\/span>,<\/span> "to_account"<\/span>,<\/span> "amount"<\/span>,<\/span> "transaction"<\/span>]<\/span>,<\/span>
\n checkpointer=<\/span>InMemorySaver(<\/span>)<\/span>,<\/span>
\n)<\/span>
\nconfig =<\/span> {<\/span>"configurable"<\/span>:<\/span> {<\/span>"thread_id"<\/span>:<\/span> "tx123"<\/span>}<\/span>}<\/span>
\ninput<\/span> =<\/span> {<\/span>"start"<\/span>:<\/span> None<\/span>,<\/span> "from_account"<\/span>:<\/span> "Alice"<\/span>,<\/span> "to_account"<\/span>:<\/span> "Bob"<\/span>}<\/span>
\nresult =<\/span> app.<\/span>invoke(<\/span>input<\/span>=<\/span>input<\/span>,<\/span> config=<\/span>config)<\/span>
\nassert<\/span> result[<\/span>"transaction"<\/span>]<\/span> ==<\/span> Transaction(<\/span>"Alice"<\/span>,<\/span> "Bob"<\/span>,<\/span> 1000000.00<\/span>)<\/span><\/p>\n

new_config =<\/span> app.<\/span>update_state(<\/span>
\n config=<\/span>list<\/span>(<\/span>app.<\/span>get_state_history(<\/span>config)<\/span>)<\/span>[<\/span>–<\/span>2<\/span>]<\/span>.<\/span>config,<\/span>
\n values=<\/span>100.00<\/span>,<\/span>
\n)<\/span>
\nresult =<\/span> app.<\/span>invoke(<\/span>input<\/span>=<\/span>None<\/span>,<\/span> config=<\/span>new_config)<\/span>
\nassert<\/span> result[<\/span>"transaction"<\/span>]<\/span> ==<\/span> Transaction(<\/span>"Alice"<\/span>,<\/span> "Bob"<\/span>,<\/span> 100.00<\/span>)<\/span>
\nfor<\/span> state in<\/span> app.<\/span>get_state_history(<\/span>config)<\/span>:<\/span>
\n print<\/span>(<\/span>f"step <\/span>{<\/span>state.<\/span>metadata[<\/span>'step'<\/span>]<\/span>}<\/span><\/span>: "<\/span><\/span>)<\/span>
\n print<\/span>(<\/span>json.<\/span>dumps(<\/span>state.<\/span>values)<\/span>)<\/span><\/p>\n

\u6211\u4eec\u8f93\u5165\u8f6c\u8d26\u53cc\u65b9\u7684\u8d26\u53f7（Alice\u548cBob\u4ee3\u66ff）\u8c03\u7528Pregel\u7684invoke\u65b9\u6cd5，\u5e76\u901a\u8fc7\u65ad\u8a00\u786e\u4fdd\u6700\u7ec8\u751f\u6210\u4e86\u6211\u4eec\u5e0c\u671b\u7684\u8f6c\u8d26\u4e1a\u52a1（Transaction(\u201cAlice\u201d, \u201cBob\u201d, 1000000.00)）\u3002\u73b0\u5728\u6211\u4eec\u9700\u8981\u5728\u8f6c\u8d26\u6d41\u7a0b\u8fdb\u884c\u5230\u91d1\u989d\u8ba1\u7b97\u7684\u5730\u65b9\u5f00\u542f\u65b0\u7684\u5206\u652f\u6765\u5c06\u4fee\u6539\u8f6c\u8d26\u91d1\u989d（100），\u4e3a\u6b64\u6211\u4eec\u8c03\u7528get_state_history\u65b9\u6cd5\u5f97\u5230\u6574\u6bb5\u5386\u53f2，\u5e76\u63d0\u53d6\u5012\u6570\u7b2c\u4e8c\u4e2a\u5feb\u7167\u7684\u914d\u7f6e（\u8f6c\u8d26\u91d1\u989d\u662f\u5728\u5012\u6570\u7b2c\u4e8c\u4e2aSuperstep\u7531calculate_amount\u63d0\u4f9b）\u3002<\/p>\n

\u6211\u4eec\u5c06\u6b64\u914d\u7f6e\u4f5c\u4e3a\u53c2\u6570\u8c03\u7528update_state\u65b9\u6cd5，\u5e76\u5c06\u65b0\u7684\u91d1\u989d\u8bbe\u7f6e\u4e3avalues\u53c2\u6570\u3002\u7531\u4e8e\u6b64Superstep\u53ea\u6d89\u53ca\u5355\u4e00Node，\u6240\u4ee5\u65e0\u9700\u6307\u5b9aas_node\u53c2\u6570\u3002\u72b6\u6001\u7684\u66f4\u65b0\u5e76\u4e0d\u4f1a\u9a71\u52a8\u540e\u7eed\u6d41\u7a0b\u7684\u81ea\u52a8\u6267\u884c，\u6211\u4eec\u8fd8\u9700\u8981\u518d\u6b21\u8c03\u7528invoke\u65b9\u6cd5\u5e76\u4ece\u8fd9\u4e2a\u5730\u65b9\u5f00\u59cb\u6267\u884c，\u6b64\u65f6\u6211\u4eec\u4e0d\u9700\u8981\u518d\u6b21\u63d0\u4f9b\u539f\u59cb\u7684\u8f93\u5165，\u53ea\u9700\u5c06update_state\u65b9\u6cd5\u8fd4\u56de\u7684RunnableConfig\u914d\u7f6e\u4f5c\u4e3a\u53c2\u6570\u3002\u518d\u6b21\u5229\u7528\u65ad\u8a00\u9a8c\u8bc1\u751f\u6210\u7684\u8f6c\u8d26\u4e1a\u52a1\u5177\u6709\u65b0\u7684\u91d1\u989d\u540e，\u6211\u4eec\u8c03\u7528get_state_history\u83b7\u53d6\u5e76\u8f93\u51fa\u65b0\u7684\u5386\u53f2\u3002\u4ece\u5982\u4e0b\u7684\u8f93\u51fa\u7ed3\u679c\u53ef\u4ee5\u770b\u51fa，\u6700\u540e\u7684\u4e24\u4e2aCheckpoint\u5c31\u662f\u6211\u4eec\u5f00\u8f9f\u7684\u65b0\u5206\u652f\u3002<\/p>\n

step 2:
\n{"start": null, "from_account": "Alice", "to_account": "Bob", "amount": 100.0, "transaction": ["Alice", "Bob", 100.0]}
\nstep 1:
\n{"start": null, "from_account": "Alice", "to_account": "Bob", "amount": 100.0}<\/p>\n

step 1:
\n{"start": null, "from_account": "Alice", "to_account": "Bob", "amount": 1000000.0, "transaction": ["Alice", "Bob", 1000000.0]}
\nstep 0:
\n{"start": null, "from_account": "Alice", "to_account": "Bob", "amount": 1000000.0}
\nstep -1:
\n{"start": null, "from_account": "Alice", "to_account": "Bob"}<\/p>\n

2. \u4fee\u6539\u539f\u59cb\u8f93\u5165<\/h3>\n

\u5982\u679c\u6211\u4eec\u53d1\u73b0\u539f\u59cb\u8f93\u5165\u9519\u8bef\u4e86，\u9700\u8981\u5728\u6d41\u7a0b\u540e\u7eed\u7684\u67d0\u4e2aNode\u5c06\u8f93\u5165\u6539\u8fc7\u6765\u600e\u4e48\u529e\u5462？\u5176\u5b9e\u5f88\u7b80\u5355，\u5c06as_node\u8bbe\u7f6e\u6210__input__\u5c31\u53ef\u4ee5\u4e86\u3002\u5c31\u4ee5\u4e0a\u9762\u8fd9\u4e2a\u8f6c\u8d26\u6d41\u7a0b\u4e3a\u4f8b，\u5047\u8bbe\u5728\u8ba1\u7b97\u91d1\u989d\u7684\u65f6\u5019\u53d1\u73b0\u63d0\u4f9b\u7684\u4e24\u4e2a\u8d26\u53f7\u5f04\u53cd\u4e86，\u6211\u4eec\u53ef\u4ee5\u91c7\u7528\u5982\u4e0b\u7684\u65b9\u5f0f\u76f4\u63a5\u7ea0\u6b63\u8fc7\u6765\u3002<\/p>\n

new_config =<\/span> app.<\/span>update_state(<\/span>
\n config=<\/span>list<\/span>(<\/span>app.<\/span>get_state_history(<\/span>config)<\/span>)<\/span>[<\/span>–<\/span>2<\/span>]<\/span>.<\/span>config,<\/span>
\n values=<\/span>{<\/span>"from_account"<\/span>:<\/span> "Bob"<\/span>,<\/span> "to_account"<\/span>:<\/span> "Alice"<\/span>,<\/span> }<\/span>,<\/span>
\n as_node=<\/span>"__input__"<\/span>
\n)<\/span>
\nresult =<\/span> app.<\/span>invoke(<\/span>input<\/span>=<\/span>None<\/span>,<\/span> config=<\/span>new_config)<\/span>
\nassert<\/span> result[<\/span>"transaction"<\/span>]<\/span> ==<\/span> Transaction(<\/span>"Bob"<\/span>,<\/span> "Alice"<\/span>,<\/span> 1_000_000.00<\/span>)<\/span>
\nfor<\/span> state in<\/span> app.<\/span>get_state_history(<\/span>config)<\/span>:<\/span>
\n metadata =<\/span> state.<\/span>metadata
\n step=<\/span>metadata[<\/span>"step"<\/span>]<\/span>
\n source=<\/span>metadata[<\/span>"source"<\/span>]<\/span>
\n print<\/span>(<\/span>f"step <\/span>{<\/span>step}<\/span><\/span>\\\\n(source: <\/span>{<\/span>source}<\/span><\/span>)\\\\nvalues:<\/span>{<\/span>json.<\/span>dumps(<\/span>state.<\/span>values)<\/span>}<\/span><\/span>\\\\n"<\/span><\/span>)<\/span><\/p>\n

\u7531\u4e8e\u6211\u4eec\u662f\u901a\u8fc7\u4fee\u6539\u539f\u59cb\u8f93\u5165\u7684\u65b9\u5f0f\u5f00\u542f\u7684\u5206\u652f，\u91cd\u5efa\u7684\u8fd9\u4e2a\u4ee3\u8868\u65b0\u5206\u652f\u8d77\u70b9\u7684Checkpoint\u7684Source\u5c06\u662finput，\u6211\u4eec\u53ef\u4ee5\u4ece\u8f93\u51fa\u7684\u5386\u53f2\u770b\u51fa\u8fd9\u4e00\u70b9\u3002<\/p>\n

step 2
\n(source: loop)
\nvalues:{"start": null, "from_account": "Bob", "to_account": "Alice", "amount": 1000000.0, "transaction": ["Bob", "Alice", 1000000.0]}<\/p>\n

step 1
\n(source: input)
\nvalues:{"start": null, "from_account": "Bob", "to_account": "Alice", "amount": 1000000.0}<\/p>\n

step 1
\n(source: loop)
\nvalues:{"start": null, "from_account": "Alice", "to_account": "Bob", "amount": 1000000.0, "transaction": ["Alice", "Bob", 1000000.0]}<\/p>\n

step 0
\n(source: loop)
\nvalues:{"start": null, "from_account": "Alice", "to_account": "Bob", "amount": 1000000.0}<\/p>\n

step -1
\n(source: input)
\nvalues:{"start": null, "from_account": "Alice", "to_account": "Bob"}<\/p>\n

3. \u5355\u7eafFork\u4e00\u4e2a\u5206\u652f<\/h3>\n

\u6211\u4eec\u8fd8\u53ef\u4ee5\u76f4\u63a5\u5728\u4e0d\u5bf9\u72b6\u6001\u4f5c\u4efb\u4f55\u66f4\u65b0\u7684\u524d\u63d0\u4e0b，\u76f4\u63a5\u62f7\u8d1d\u6307\u5b9aCheckpoint\u7684\u65b9\u5f0f\u5f00\u542f\u4e00\u4e2a\u5206\u652f，\u6b64\u65f6\u53ea\u9700\u8981\u5c06as_node\u53c2\u6570\u8bbe\u7f6e\u4e3a__copy__\u5c31\u53ef\u4ee5\u4e86，\u5bf9\u4e8e\u8fd9\u4e2a\u5fc5\u9700\u7684values\u53c2\u6570，\u6211\u4eec\u6307\u5b9a\u4e3a\u4e00\u4e2a\u7a7a\u7684\u5217\u8868\u4ee3\u8868\u4e0d\u5bf9\u72b6\u6001\u505a\u4efb\u4f55\u66f4\u65b0\u3002<\/p>\n

new_config =<\/span> app.<\/span>update_state(<\/span>
\n config=<\/span>list<\/span>(<\/span>app.<\/span>get_state_history(<\/span>config)<\/span>)<\/span>[<\/span>–<\/span>2<\/span>]<\/span>.<\/span>config,<\/span>
\n values=<\/span>[<\/span>]<\/span>,<\/span>
\n as_node=<\/span>"__copy__"<\/span>
\n)<\/span>
\nresult =<\/span> app.<\/span>invoke(<\/span>input<\/span>=<\/span>None<\/span>,<\/span> config=<\/span>new_config)<\/span>
\nassert<\/span> result[<\/span>"transaction"<\/span>]<\/span> ==<\/span> Transaction(<\/span>"Alice"<\/span>,<\/span> "Bob"<\/span>,<\/span> 1_000_000.00<\/span>)<\/span>
\nfor<\/span> state in<\/span> app.<\/span>get_state_history(<\/span>config)<\/span>:<\/span>
\n metadata =<\/span> state.<\/span>metadata
\n step=<\/span>metadata[<\/span>"step"<\/span>]<\/span>
\n source=<\/span>metadata[<\/span>"source"<\/span>]<\/span>
\n print<\/span>(<\/span>f"step <\/span>{<\/span>step}<\/span><\/span>\\\\n(source: <\/span>{<\/span>source}<\/span><\/span>)\\\\nvalues:<\/span>{<\/span>json.<\/span>dumps(<\/span>state.<\/span>values)<\/span>}<\/span><\/span>\\\\n"<\/span><\/span>)<\/span><\/p>\n

\u4f7f\u7528__copy__\u4f5c\u4e3aas_node\u7684\u53c2\u6570\u503c\u7684\u610f\u56fe\u5f88\u660e\u786e，\u90a3\u5c31\u662f\u5728\u6b64\u5904fork\u4e00\u4e2a\u65b0\u7684\u5206\u652f，\u6240\u4ee5\u521b\u5efa\u7684Checkpoint\u7684Source\u5c31\u662ffork，\u8f93\u51fa\u7684\u5386\u53f2\u4e5f\u4f53\u73b0\u4e86\u8fd9\u4e00\u70b9\u3002<\/p>\n

step 2
\n(source: loop)
\nvalues:{"start": null, "from_account": "Alice", "to_account": "Bob", "amount": 1000000.0, "transaction": ["Alice", "Bob", 1000000.0]}<\/p>\n

step 1
\n(source: fork)
\nvalues:{"start": null, "from_account": "Alice", "to_account": "Bob", "amount": 1000000.0}<\/p>\n

step 1
\n(source: loop)
\nvalues:{"start": null, "from_account": "Alice", "to_account": "Bob", "amount": 1000000.0, "transaction": ["Alice", "Bob", 1000000.0]}<\/p>\n

step 0
\n(source: loop)
\nvalues:{"start": null, "from_account": "Alice", "to_account": "Bob", "amount": 1000000.0}<\/p>\n

step -1
\n(source: input)
\nvalues:{"start": null, "from_account": "Alice", "to_account": "Bob"}<\/p>\n

4. \u5728\u62f7\u8d1d\u7684\u57fa\u7840\u4e0a\u540c\u65f6\u4fee\u6539\u72b6\u6001<\/h3>\n

\u5728\u62f7\u8d1d\u7684\u540c\u65f6\u4fee\u6539\u72b6\u6001\u4e5f\u662f\u53ef\u4ee5\u7684，\u800c\u4e14\u8fd8\u53ef\u4ee5\u540c\u65f6\u9488\u5bf9\u591a\u4e2aNode\u4fee\u6539\u5bf9\u5e94\u7684\u72b6\u6001，\u6b64\u65f6values\u53c2\u6570\u9700\u8981\u8bbe\u7f6e\u4e3a\u4e24\u5c42\u5e8f\u5217\u3002\u5916\u5c42\u5e8f\u5217\u4ee3\u8868\u9488\u5bf9\u4e0d\u540cNode\u7684\u72b6\u6001\u66f4\u65b0，\u5185\u5c42\u6307\u5b9a\u503c\u548cNode\u540d\u79f0，\u5177\u4f53\u7684\u683c\u5f0f\u4e3a[[value1,node1],[value2, node2],..]（\u4f7f\u7528\u5143\u7ec4\u4e5f\u53ef\u4ee5）\u3002\u6bd4\u5982\u4e0b\u9762\u7684\u4e24\u6bb5\u4ee3\u7801\u5206\u522b\u5b9e\u73b0\u4e86\u9488\u5bf9\u8f93\u5165\u7684\u66f4\u65b0\u548c\u91d1\u989d\u7684\u66f4\u65b0\u3002\u4e3a\u4ec0\u4e48\u4e0d\u653e\u5728\u4e00\u8d77\u4e86，\u56e0\u4e3a\u8f93\u5165（__input__）\u4e0d\u652f\u6301\u591aNode\u66f4\u65b0\u3002<\/p>\n

new_config =<\/span> app.<\/span>update_state(<\/span>
\n config=<\/span>list<\/span>(<\/span>app.<\/span>get_state_history(<\/span>config)<\/span>)<\/span>[<\/span>–<\/span>2<\/span>]<\/span>.<\/span>config,<\/span>
\nvalues=<\/span>[<\/span>
\n [<\/span>{<\/span>"from_account"<\/span>:<\/span> "Jason"<\/span>,<\/span> "to_account"<\/span>:<\/span> "Jyden"<\/span>,<\/span> }<\/span>,<\/span>"__input__"<\/span>]<\/span>
\n ]<\/span>,<\/span>
\n as_node=<\/span>"__copy__"<\/span>
\n)<\/span>
\nresult =<\/span> app.<\/span>invoke(<\/span>input<\/span>=<\/span>None<\/span>,<\/span> config=<\/span>new_config)<\/span>
\nassert<\/span> result[<\/span>"transaction"<\/span>]<\/span> ==<\/span> Transaction(<\/span>"Jason"<\/span>,<\/span> "Jyden"<\/span>,<\/span> 1_000_000.00<\/span>)<\/span><\/p>\n

new_config =<\/span> app.<\/span>update_state(<\/span>
\n config=<\/span>list<\/span>(<\/span>app.<\/span>get_state_history(<\/span>config)<\/span>)<\/span>[<\/span>–<\/span>2<\/span>]<\/span>.<\/span>config,<\/span>
\n values=<\/span>[<\/span>
\n [<\/span>9999<\/span>,<\/span>"calculate_amount"<\/span>]<\/span>
\n ]<\/span>,<\/span>
\n as_node=<\/span>"__copy__"<\/span>
\n)<\/span>
\nresult =<\/span> app.<\/span>invoke(<\/span>input<\/span>=<\/span>None<\/span>,<\/span> config=<\/span>new_config)<\/span>
\nassert<\/span> result[<\/span>"transaction"<\/span>]<\/span> ==<\/span> Transaction(<\/span>"Alice"<\/span>,<\/span> "Bob"<\/span>,<\/span> 9999<\/span>)<\/span><\/p>\n

5. \u6279\u91cf\u66f4\u65b0<\/h3>\n

\u5982\u679c\u6d89\u53ca\u591aNode\u72b6\u6001\u66f4\u65b0，\u5c31\u9700\u8981\u5c06\u6bcf\u4e2a\u66f4\u65b0\u5c01\u88c5\u6210StateUpdate\u5bf9\u8c61，\u7136\u540e\u8fdb\u4e00\u6b65\u7ec4\u5408\u6210\u53cc\u5c42\u5e8f\u5217Sequence[Sequence[StateUpdate]]，\u5e76\u5c06\u5176\u4f5c\u4e3a\u53c2\u6570\u8c03\u7528bulk_update_state\/abulk_update_state\u65b9\u6cd5\u3002\u65b9\u6cd5\u5c06\u6bcf\u4e2aSequence[StateUpdate]\u5bf9\u8c61\u4f5c\u4e3a\u4e00\u6279\u7edf\u4e00\u5199\u5165，\u5e76\u4e3a\u5b83\u4eec\u521b\u5efa\u4e00\u4e2aCheckpoint\u3002\u5982\u679c\u5e8f\u5217\u4e2d\u5305\u542b\u591a\u4e2aStateUpdate\u5bf9\u8c61，\u6bcf\u4e2a\u5bf9\u8c61\u5fc5\u987b\u901a\u8fc7as_node\u5b57\u6bb5\u5c06\u66f4\u65b0\u72b6\u6001\u7684 \u201c\u540d\u4e49Node\u201d \u786e\u5b9a\u4e0b\u6765\u3002<\/p>\n

\u5982\u4e0b\u8fd9\u4e2a\u6f14\u793a\u7a0b\u5e8f\u4e2d\u7684Pregel\u7531\u56db\u4e2a\u5e76\u884c\u6267\u884c\u7684\u8282\u70b9foo\u3001bar\u3001baz\u548cqux\u7ec4\u6210，\u5b83\u4eec\u4f1a\u5c06\u81ea\u8eab\u7684Node\u540d\u79f0\u5199\u5165\u4e0e\u4e4b\u540c\u540d\u7684Channel\u3002\u5728\u5e38\u89c4\u6267\u884c\u4e4b\u540e，\u6211\u4eec\u8c03\u7528\u4e86bulk_update_state\u65b9\u6cd5，\u5e76\u5c06supersteps\u53c2\u6570\u6307\u5b9a\u4e3a\u4e00\u4e2a\u5305\u542b\u4e24\u7ec4StateUpdate\u5217\u8868\u7684\u5217\u8868，\u5206\u522b\u4ee5\u8282\u70b9foo\/bar\u548cbaz\/qux\u7684\u540d\u4e49\u4fee\u6539\u5bf9\u5e94Channel\u7684\u503c\u3002<\/p>\n

from<\/span> langgraph.<\/span>channels import<\/span> LastValue
\nfrom<\/span> langgraph.<\/span>pregel import<\/span> Pregel,<\/span> NodeBuilder
\nfrom<\/span> langgraph.<\/span>checkpoint.<\/span>memory import<\/span> InMemorySaver
\nfrom<\/span> langgraph.<\/span>types import<\/span> StateUpdate<\/p>\n

def<\/span> build_node<\/span>(<\/span>node_name:<\/span> str<\/span>)<\/span>:<\/span>
\n return<\/span> (<\/span>
\n NodeBuilder(<\/span>)<\/span>
\n .<\/span>subscribe_to(<\/span>"start"<\/span>,<\/span> read=<\/span>False<\/span>)<\/span>
\n .<\/span>do(<\/span>lambda<\/span> _<\/span>:<\/span> node_name)<\/span>
\n .<\/span>write_to(<\/span>node_name)<\/span>
\n )<\/span><\/p>\n

nodes =<\/span> {<\/span>name:<\/span> build_node(<\/span>name)<\/span> for<\/span> name in<\/span> [<\/span>"foo"<\/span>,<\/span> "bar"<\/span>,<\/span> "baz"<\/span>,<\/span> "qux"<\/span>]<\/span>}<\/span>
\napp =<\/span> Pregel(<\/span>
\n nodes=<\/span>nodes,<\/span>
\n channels=<\/span>{<\/span>
\n "start"<\/span>:<\/span> LastValue(<\/span>None<\/span>)<\/span>,<\/span>
\n "foo"<\/span>:<\/span> LastValue(<\/span>str<\/span>)<\/span>,<\/span>
\n "bar"<\/span>:<\/span> LastValue(<\/span>str<\/span>)<\/span>,<\/span>
\n "baz"<\/span>:<\/span> LastValue(<\/span>str<\/span>)<\/span>,<\/span>
\n "qux"<\/span>:<\/span> LastValue(<\/span>str<\/span>)<\/span>,<\/span>
\n }<\/span>,<\/span>
\n input_channels=<\/span>[<\/span>"start"<\/span>]<\/span>,<\/span>
\n output_channels=<\/span>[<\/span>"foo"<\/span>,<\/span> "bar"<\/span>,<\/span> "baz"<\/span>,<\/span> "qux"<\/span>]<\/span>,<\/span>
\n checkpointer=<\/span>InMemorySaver(<\/span>)<\/span>,<\/span>
\n)<\/span>
\nconfig =<\/span> {<\/span>"configurable"<\/span>:<\/span> {<\/span>"thread_id"<\/span>:<\/span> "tx123"<\/span>}<\/span>}<\/span>
\nresult =<\/span> app.<\/span>invoke(<\/span>input<\/span>=<\/span>{<\/span>"start"<\/span>:<\/span> None<\/span>}<\/span>,<\/span> config=<\/span>config)<\/span><\/p>\n

new_config =<\/span> app.<\/span>bulk_update_state(<\/span>
\n config=<\/span>config,<\/span>
\n supersteps=<\/span>[<\/span>
\n [<\/span>
\n StateUpdate(<\/span>as_node=<\/span>"foo"<\/span>,<\/span> values=<\/span>"updated_foo"<\/span>)<\/span>,<\/span>
\n StateUpdate(<\/span>as_node=<\/span>"bar"<\/span>,<\/span> values=<\/span>"updated_bar"<\/span>)<\/span>,<\/span>
\n ]<\/span>,<\/span>
\n [<\/span>
\n StateUpdate(<\/span>as_node=<\/span>"baz"<\/span>,<\/span> values=<\/span>"updated_baz"<\/span>)<\/span>,<\/span>
\n StateUpdate(<\/span>as_node=<\/span>"qux"<\/span>,<\/span> values=<\/span>"updated_qux"<\/span>)<\/span>,<\/span>
\n ]<\/span>,<\/span>
\n ]<\/span>,<\/span>
\n)<\/span><\/p>\n

result =<\/span> app.<\/span>invoke(<\/span>input<\/span>=<\/span>None<\/span>,<\/span> config=<\/span>new_config)<\/span>
\nassert<\/span> result ==<\/span> {<\/span>
\n "foo"<\/span>:<\/span> "updated_foo"<\/span>,<\/span>
\n "bar"<\/span>:<\/span> "updated_bar"<\/span>,<\/span>
\n "baz"<\/span>:<\/span> "updated_baz"<\/span>,<\/span>
\n "qux"<\/span>:<\/span> "updated_qux"<\/span>,<\/span>
\n}<\/span><\/p>\n

for<\/span> state in<\/span> app.<\/span>get_state_history(<\/span>config)<\/span>:<\/span>
\n metadata =<\/span> state.<\/span>metadata
\n step =<\/span> metadata[<\/span>"step"<\/span>]<\/span>
\n source =<\/span> metadata[<\/span>"source"<\/span>]<\/span>
\n print<\/span>(<\/span>f"step <\/span>{<\/span>step}<\/span><\/span>\\\\nsource: <\/span>{<\/span>source}<\/span><\/span>\\\\nvalues: <\/span>{<\/span>state.<\/span>values}<\/span><\/span>"<\/span><\/span>)<\/span>
\n print<\/span>(<\/span>)<\/span><\/p>\n

\u4e24\u4e2aStateUpdate\u5e8f\u5217\u5bf9\u5e94\u7740\u4e24\u4e2aCheckpoint\u7684\u521b\u5efa，\u5177\u4f53\u4f53\u73b0\u5728\u5982\u4e0b\u6240\u793a\u7684\u8f93\u51fa\u7ed3\u679c\u4e2d\u3002\u524d\u4e00\u4e2aCheckpoint\u5305\u542b\u4e86\u9488\u5bf9\u901a\u9053foo\u548cbar\u7684\u66f4\u65b0，\u9488\u5bf9\u901a\u9053baz\/qux\u7684\u66f4\u65b0\u4f53\u73b0\u5728\u540e\u4e00\u4e2aCheckpoint\u4e2d\u3002<\/p>\n

step 2
\nsource: update
\nvalues: {'start': None, 'foo': 'updated_foo', 'bar': 'updated_bar', 'baz': 'updated_baz', 'qux': 'updated_qux'}<\/p>\n

step 1
\nsource: update
\nvalues: {'start': None, 'foo': 'updated_foo', 'bar': 'updated_bar', 'baz': 'baz', 'qux': 'qux'}<\/p>\n

step 0
\nsource: loop
\nvalues: {'start': None, 'foo': 'foo', 'bar': 'bar', 'baz': 'baz', 'qux': 'qux'}<\/p>\n

step -1
\nsource: input
\nvalues: {'start': None}<\/p>\n","protected":false},"excerpt":{"rendered":"

\u76ee\u524d\u9488\u5bf9update_state\u65b9\u6cd5\u7684\u8c03\u7528\u90fd\u662f\u9488\u5bf9\u6700\u7ec8\u72b6\u6001，\u5982\u679c\u9488\u5bf9\u67d0\u4e2a\u8fc7\u53bb\u7684\u5386\u53f2\u8282\u70b9\u8c03\u7528\u6b64\u65b9\u6cd5，\u5c31\u4f1a\u5728\u5bf9\u5e94\u7684\u5730\u65b9\u5f00\u542f\u4e86\u4e00\u4e2a\u65b0\u7684\u5206\u652f\u3002\u9664\u6b64\u4e4b\u5916，\u6211\u4eec\u8fd8\u53ef\u4ee5\u5229\u7528bulk_update_state\/abulk_update_state\u65b9\u6cd5\u5b9e\u73b0\u6279\u91cf\u72b6\u6001\u66f4\u65b0\u3002
\n1. \u4ee5\u5386\u53f2\u8282\u70b9\u540d\u4e49\u4fee\u6539\u72b6\u6001
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