> ## Documentation Index
> Fetch the complete documentation index at: https://docs.comfy.org/llms.txt
> Use this file to discover all available pages before exploring further.

# KarrasScheduler - ComfyUI Built-in Node Documentation

> Complete documentation for the KarrasScheduler node in ComfyUI. Learn its inputs, outputs, parameters and usage.

The KarrasScheduler node is designed to generate a sequence of noise levels (sigmas) based on the Karras et al. (2022) noise schedule. This scheduler is useful for controlling the diffusion process in generative models, allowing for fine-tuned adjustments to the noise levels applied at each step of the generation process.

## Inputs

| Parameter   | Data Type | Description                                                                                                                           |
| ----------- | --------- | ------------------------------------------------------------------------------------------------------------------------------------- |
| `steps`     | INT       | Specifies the number of steps in the noise schedule, affecting the granularity of the generated sigmas sequence.                      |
| `sigma_max` | FLOAT     | The maximum sigma value in the noise schedule, setting the upper bound of noise levels.                                               |
| `sigma_min` | FLOAT     | The minimum sigma value in the noise schedule, setting the lower bound of noise levels.                                               |
| `rho`       | FLOAT     | A parameter that controls the shape of the noise schedule curve, influencing how noise levels progress from sigma\_min to sigma\_max. |

## Outputs

| Parameter | Data Type | Description                                                                                        |
| --------- | --------- | -------------------------------------------------------------------------------------------------- |
| `sigmas`  | SIGMAS    | The generated sequence of noise levels (sigmas) following the Karras et al. (2022) noise schedule. |