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So:
```with Flow("Data preprocess" as data_preprocess_flow:
  ...

with Flow("Visualization" as visualization_flow:
  ...```
vs:

```with Flow("Monolithic data pipeline") as monolithic_flow:
   res = data_preprocess(dataframe)
   res = train(res)
   ...```


In Prefect 2 you can you use subflows, which might be a good fit. I recommend <https://docs.prefect.io/concepts/flows/#composing-flows|reading this>, especially the 'Subflows or tasks?' section.

Out of mere curiosity, how have people accomplished this in Prefect 1?

I believe a flow of flows would be the Prefect 1 equivalent: <https://docs-v1.prefect.io/core/idioms/flow-to-flow.html#scheduling-a-flow-of-flows>