The complete flow of Lang-Agent's cyclic control through the state variable mechanism is as follows:
1. Definition of variables
- Initialize the counter variable (e.g. counter=0) at the "start node".
- Define the loop termination condition variable (e.g. max_count=5)
2. Circular implementation
- Add a "counter node" to the workflow and configure the action as counter+=1.
- Two conditional edges are induced from the counter node:
- Conditional edge 1: {{counter}} < {{max_count}} → point to the node that needs to be executed in a loop
- Conditional edge 2: {{counter}} >= {{max_count}} → point to end node
3. Typical application scenarios
- Content generation: recursively call LLM nodes to continue the poem until the line count requirement is met
- Data batch processing: batch processing of large data sets
- Automated Testing: Repeated Execution of Test Cases
The advantages of the mechanism are:
- Implementation of traditional programming while loop logic through a visual interface
- Real-time visualization of state variables for easy debugging
- Support for complex control structures such as nested loops
This answer comes from the articleLang-Agent: a LangGraph-based platform for visualizing the configuration of AI intelligencesThe
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