LossGraphNode - ComfyUI Built-in Node Documentation - ComfyUI

The LossGraphNode creates a line chart of training loss values over training steps and shows it as a preview image. It reads loss values from a training node, plots them on a graph with labeled axes and min/max loss values, and returns the graph as an image preview in the UI. This node is marked as experimental and is an output node.

Inputs

Parameter	Description	Data Type	Required	Range
`loss`	Loss map from training node. It must contain a `loss` key with a list of numeric loss values.	LOSS_MAP	Yes	-
`filename_prefix`	Prefix for the saved loss graph image. (default: “loss_graph”)	STRING	Yes	-

Outputs

Output Name	Description	Data Type
`ui.images`	The generated loss graph image displayed as a preview.	IMAGE

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