By default, when running a Tool, each tool step is executed once. However, Relevance supports running a step multiple times in a loop as well.

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Loops

Imagine a scenario where we wish to run a step across a set of items. For instance, a list of topics, for each we need to generate a description using a large language model. Or a list of movie names for each we want to generate a summary.
  1. Access loops under the three-dot menu on the top right of steps. Click on Enable foreach.

  1. Run this transformation multiple times is the input field that expects a list of items (e.g. list of movie names). Provide the input list manually or activate the variable mode as shown in the image below.

and use {{variable-name}} to access an existing variable in the Tool, for instance {{movies}}.
  1. Access every single item from your input list within a step via {{ foreach.item }} or/and {{ foreach.index }}. In the image below, there is a Python step returning a list of items. We wish to run a large language model on each of the elements with the instruction “Write me a … ”.

After enabling Foreach, under Run this transformation multiple times, we enable the variable mode and access the Python step output via {{python.transformed}} - note that the name of the step is python in our example. Next, we use {{foreach.item}} to access each of the elements in the list. After running the step, we will have as many output tabs as the number of elements in the input list.