How to define routing from multiple fan-in nodes to multiple fan-out nodes

[hasansalimkanmaz]

In my graph, I have some validation checks that I would like to run in parallel to save some time. Later on, based on these checks. I would like to either run a predefined answer or an LLM-generated answer. So, I need a conditional edge(s) that routes the fan-in nodes to fan-out nodes. The only requirement is to validate all checks in parallel, wait until they are done, and then route them to the right fan-out node. I couldn't find a suggestion on tutorials.

Example

My workaround at the moment is to put an empty node in between fan-in and fan-out nodes which does nothing apart from ensuring all checks are done and have a conditional edge from this node to fan-out nodes. Though it does the job, it seems unintuitive. Am I missing some best practices here or is it the only way to go forward?

[hasansalimkanmaz]

@vbarda any suggestions on this?

[hasansalimkanmaz]

@hwchase17 any suggestions on this?