FEEDBACK

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Capture and save the results of a specified block over time. This block is almost always used in a LOOP. If the result is not found, it passes the result of the parent node. Params: referred_node : str The node ID to capture the result from. Returns: out : DataContainer The result of the specified node ID, or the result of the parent node if it was not found.

Python Code

from typing import Any, Optional

from flojoy import (
    DataContainer,
    JobResultBuilder,
    NodeReference,
    flojoy,
    get_job_result,
)


@flojoy
def FEEDBACK(
    referred_node: NodeReference,
    default: Optional[DataContainer] = None,
) -> Any:
    """Capture and save the results of a specified block over time. This block is almost always used in a LOOP.

    If the result is not found, it passes the result of the parent node.

    Parameters
    ----------
    referred_node : str
        The node ID to capture the result from.

    Returns
    -------
    DataContainer
        The result of the specified node ID, or the result of the parent node if it was not found.
    """

    result = get_job_result(referred_node.ref)
    if result:
        return result
    else:
        return (
            JobResultBuilder()
            .from_inputs([default] if default else [])
            .flow_to_directions(["default"])
            .build()
        )

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Example App

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In this example, the LOOP node is used to iterate over an app multiple times, specifically 5 times.

Inside the LOOP body, we start by multiplying two CONSTANT nodes, 4 and 2, together. For subsequent iterations, we utilize FEEDBACK node. This node captures the result of multiplication of the two constants from the previous iteration and multiplies it to a CONSTANT node with a value of 2.

To visualize the sum, we employ the BIG_NUMBER node, which generates a plotly figure displaying a large number. The figure includes a relative delta, which represents the change relative to the previous iteration.