ComfyUI-VariationLab

A collection of experimental nodes for ComfyUI that enable systematic exploration of generation parameters.

Features

This custom node collection provides specialized variation nodes for ComfyUI:

VariationLab: CFG Explorer

• Generate a batch of images with different CFG (Classifier-Free Guidance) values
• Useful for finding the ideal CFG value for your prompt

VariationLab: Step Explorer

• Generate a batch of images with different step counts
• Perfect for comparing how many steps are needed for good results

VariationLab: Checkpoint Explorer

• Generate images using multiple checkpoints in a single workflow
• Supports up to 5 different checkpoints with customization for each:
  • Model-specific prompts (suffixes)
  • Clip skip values
  • Samplers, schedulers, CFG values, and step counts

Installation

1. Clone this repository into your ComfyUI custom_nodes folder:

cd ComfyUI/custom_nodes
git clone https://github.com/yourusername/ComfyUI-VariationLab.git

2. Restart ComfyUI

Usage

CFG Explorer

Connect model, conditioning (positive/negative), VAE, and latent inputs, then specify:

• Seed value
• Step count
• CFG range (start, end, and number of steps)
• Sampler and scheduler

Step Explorer

Connect model, conditioning, VAE, and latent inputs, then specify:

• Seed value
• Step range (start, end, and number of steps)
• CFG value
• Sampler and scheduler

Checkpoint Explorer

Connect a latent input and specify:

• Base prompts (positive/negative)
• Seed value
• Default values for steps, CFG, sampler, etc.
• Up to 5 checkpoints with per-checkpoint customization

Example Workflows

Example workflows can be found in the example_workflows directory:

• batch_cfg_demo.json: Demonstrates the CFG Explorer (CFG variation)
• batch_steps_demo.json: Demonstrates the Step Explorer (step count variation)
• batch_checkpoint_demo.json: Demonstrates the Checkpoint Explorer (model comparison)

Note: If you experience validation errors when loading example workflows, try creating a new workflow from scratch by adding the nodes manually. Ensure you're using valid samplers (like "euler", "euler_ancestral", etc.) and schedulers ("normal", "karras", etc.).

Future Development

• Improved parameter handling
• Support for more parameter types (sampler exploration, prompt exploration)
• Integration with ComfyUI's queue system
• Modular design for extensible parameter types
• Visual grid layout enhancements

License

MIT License