ComfyUI-Nunchaku QwenImage＆ZImageTurboLoraStack

A ComfyUI custom node for loading and applying LoRA (Low-Rank Adaptation) to Nunchaku Qwen Image and Z-ImageTurbo models. ComfyUI Nodes 2.0 compatible. Requires Nunchaku 1.2.0+ and ComfyUI-Nunchaku 1.2.0+ for v4 functionality.

⚠️ DEVELOPMENT STATUS

Currently under development and testing. Debug logs are being output extensively. This does not affect functionality.

Latest release: v2.4.3 on GitHub Releases

Source

This LoRA loader was extracted and modified from GavChap's fork:

• Original Fork: GavChap/ComfyUI-nunchaku (qwen-lora-suport-standalone branch)
• Extraction: LoRA functionality was extracted from the full fork to create an independent custom node
• Integration: Modified to work with the official ComfyUI-nunchaku plugin

🎉 MAJOR UPDATE: v2.2.0 - Nunchaku Z Image Turbo LoRA Support Added!

For detailed technical explanation, see v2.2.0 Release Notes

🎉 MAJOR UPDATE: v1.60 - Simplified Installation (No Integration Required!)

For installation instructions, features, and requirements, see Installation Guide.

Upgrade Guide for v1.57 and Earlier Users

If you have v1.57 or earlier installed with integration code in ComfyUI-nunchaku's __init__.py, see UPGRADE_GUIDE_V1.57.md for detailed upgrade instructions.

Usage

Debug logs (optional)

By default, detailed debug logs are muted. If you want detailed debug output (Key Diffusion / key mapping inspection, [APPLY], [AWQ_MOD], etc.), set the environment variable nunchaku_log=1 before starting ComfyUI.

Available Nodes

• NunchakuQwenImageLoraLoader: Single LoRA loader

• NunchakuQwenImageLoraStack: Multi LoRA stacker with dynamic UI (Legacy)

• NunchakuQwenImageLoraStackV1: Multi LoRA stacker with rgthree-style UI
  • Clean, minimalist design inspired by Power Lora Loader (rgthree-comfy). Toggle, LoRA name, and strength per row.
  • ⚠️ Note: Does not work properly with ComfyUI Nodes 2.0. Use the standard (LiteGraph) canvas.
  • ⚠️ When using with ComfyUI Nodes 2.0, pressing F5 to refresh will reflect changes.

• NunchakuQwenImageLoraStackV2: Multi LoRA stacker with dynamic UI - ComfyUI Nodes 2.0 (Beta) compatible
  • AWQ Modulation Layer Support: Includes experimental support for applying LoRA to AWQ quantized modulation layers (img_mod.1 / txt_mod.1) via the "Apply AWQ Mod" toggle. This feature uses Runtime Monkey Patch with Manual Planar Injection to fix noise issues. ⚠️ Warning: This is an experimental feature currently implemented only in V2 nodes. If no issues are found, this feature will be applied to V1 and V3 nodes as well.

• NunchakuQwenImageLoraStackV3: Multi LoRA stacker with dynamic UI - ComfyUI Nodes 2.0 (Beta) compatible
  • AWQ Modulation Layer Support: AWQ quantized modulation layers (img_mod.1 / txt_mod.1) LoRA application is always enabled (no switch needed). This feature uses Runtime Monkey Patch with Manual Planar Injection to fix noise issues. ✅ V3 nodes always apply AWQ modulation layer LoRA by default.

• NunchakuZImageTurboLoraStackV1: Z-Image-Turbo LoRA stacker with rgthree-style UI
  • Clean, minimalist design inspired by Power Lora Loader (rgthree-comfy). Toggle, LoRA name, and strength per row. For official Nunchaku Z-Image loader only. Uses compose_loras_v2.
  • ⚠️ Note: Does not work properly with ComfyUI Nodes 2.0. Use the standard (LiteGraph) canvas.
  • ⚠️ When using with ComfyUI Nodes 2.0, pressing F5 to refresh will reflect changes.

• NunchakuZImageTurboLoraStackV4: Z-Image-Turbo LoRA stacker with dynamic UI - Standard ComfyUI LoRA loader format (CLIP input/output) - ComfyUI Nodes 2.0 compatible

• NunchakuZImageTurboLoraStackV2: Z-Image-Turbo LoRA stacker with dynamic UI - Unofficial loader only - ComfyUI Nodes 2.0 compatible
  • ⚠️ Warning: This node is only compatible with the unofficial Nunchaku Z-Image-Turbo DiT Loader from ComfyUI-nunchaku-unofficial-loader
  • ⚠️ Not Compatible: This node is not compatible with the official Nunchaku Z-Image-Turbo DiT Loader from ComfyUI-Nunchaku

Basic Usage

For Nunchaku Qwen Image models:

1. Load your Nunchaku Qwen Image model using Nunchaku Qwen Image DiT Loader
2. Add either NunchakuQwenImageLoraLoader or NunchakuQwenImageLoraStack node
3. Select your LoRA file and set the strength
4. Connect to your workflow

For Nunchaku Z-Image-Turbo models:

1. Load your Nunchaku Z-Image-Turbo model using Nunchaku Z-Image DiT Loader (official ComfyUI-Nunchaku)
2. Add Nunchaku Z-Image-Turbo LoRA Stack V4 node
3. Connect CLIP input (required in v4)
4. Select your LoRA file and set the strength
5. Connect to your workflow

Features

• Easy Installation: Simple git clone installation
• Independent Operation: No integration code required (v1.60+)
• Automatic Node Discovery: ComfyUI automatically loads the custom node
• Error Handling: Comprehensive error checking and user feedback
• Issue #1 Fixed: Resolved ComfyUI\custom_nodes not found error with improved path detection (thanks to @mcv1234's solution)
• Issue #2 Fixed: Fixed UTF-8 encoding error causing SyntaxError: (unicode error) by using dedicated Python script for proper UTF-8 encoding (thanks to @AHEKOT's bug report)
• Issue #3 Fixed (v1.4.0): Resolved Node break cached progress error by implementing proper IS_CHANGED method with hash-based change detection (thanks to @AHEKOT's bug report)
• Issue #10 Fixed: Added portable ComfyUI support with embedded Python detection (Issue #10) - Special Thanks: This crucial feature was suggested by @vvhitevvizard, who identified the need for embedded Python support in portable ComfyUI installations. Without this suggestion, portable ComfyUI users would not have been able to use this LoRA loader.
• PR #48 Merged (v2.3.8): Improved PEFT format LoRA detection and added safety skip logs (PR #48) - Special Thanks: We are deeply grateful to @avan06 for identifying and fixing a critical mapping defect that caused PEFT format LoRAs to be incorrectly skipped. This fix significantly improves LoRA format compatibility and ensures proper detection of LoRA files created with Hugging Face PEFT library.
• PR #49 Merged (v2.4.0): Added Nunchaku Qwen Image LoRA Stack V1 with rgthree-style UI (PR #49) - Special Thanks: We are deeply grateful to @avan06 for proposing the clean, minimalist interface inspired by Power Lora Loader (rgthree-comfy). This contribution brings an elegant LoRA row layout with toggle, LoRA name, and strength control. We had long felt the need for such a UI but were unable to implement it with our technical skills; this PR fulfilled that need.

Requirements

• ComfyUI
• ComfyUI-nunchaku plugin (official version, no modification required)
• PyTorch
• Python 3.11+

Compatibility

This node is designed to work with:

• ComfyUI-nunchaku plugin (official version)
• Nunchaku Qwen Image models
• Standard ComfyUI workflows

Troubleshooting

Error: "ModuleNotFoundError: No module named 'nunchaku'"

Problem: The nunchaku package is not installed.

Solution:

1. Install ComfyUI-nunchaku plugin from the official repository
2. Follow the nunchaku installation instructions to install the nunchaku wheel
3. Restart ComfyUI

Issue #25: ComfyUI 0.4.0+ Model Management Errors

• Status: ⚠️ Environment Dependent - May require ComfyUI core fixes

For detailed information, see COMFYUI_0.4.0_MODEL_MANAGEMENT_ERRORS.md.

• Related Issues:
  • Issue #25 - AttributeError: 'NunchakuModelPatcher' object has no attribute 'pinned' and deepcopy errors with model_config
  • Issue #33 - AttributeError: 'NoneType' object has no attribute 'to' in to_safely method (Fixed in v2.1.0)
  • ComfyUI Issue #6590 - 'NoneType' object has no attribute 'shape'
  • ComfyUI Issue #6600 - 'NoneType' object is not callable (Loader-related)
  • ComfyUI Issue #6532 - Crash after referencing models after model unload

Error: "No module named 'diffusers.models.transformers.transformer_z_image'"

Problem: This error occurs when using Qwen-Edit models or Z-Image-Turbo models with an outdated diffusers library version.

Error Message: ModuleNotFoundError: No module named 'diffusers.models.transformers.transformer_z_image'

Root Cause: The most likely cause is that the diffusers library version is too old and does not include the transformer_z_image module, which is required for Z-Image-Turbo model support. When ComfyUI-nunchaku's model loader tries to load Z-Image-Turbo models (or Qwen-Edit models that may be detected as Z-Image format), it attempts to import this module, but it doesn't exist in older diffusers versions. This module was added in a later version of diffusers to support Z-Image-Turbo models.

Solution: Update the diffusers library to the latest version:

If using a virtual environment (venv):

pip install --upgrade diffusers

If using ComfyUI's embedded Python:

ComfyUI\python_embeded\python.exe -m pip install --upgrade diffusers

How to Verify: After updating, restart ComfyUI and try loading your model again. The error should be resolved.

Related Issues: Issue #38, Issue #40

Known Limitations

LoKR (Lycoris) LoRA Support

• Status: ❌ Not Supported
• Issue: LoRAs in LoKR format (created by Lycoris) are not supported.
  • Important Note: This limitation applies specifically to Nunchaku quantization models. LoKR format LoRAs may work with standard (non-quantized) Qwen Image models, but this node is designed for Nunchaku models only.
  • ⚠️ Development History: We have spent considerable time analyzing the internal structure of LoKR format and performing extensive mapping tests. Despite these efforts, we have not been able to find a successful way to apply LoKR weights to Nunchaku quantization models. The experimental conversion code has been tested but ultimately disabled due to incompatibility issues.
  • LoKR weights are automatically skipped when detected (experimental conversion code is disabled).
  • Converting to Standard LoRA using SVD approximation (via external tools or scripts) has also been tested and found to result in noise/artifacts when applied to Nunchaku quantization models.
• Conclusion: At this time, we have not found a way to successfully apply LoKR weights to Nunchaku models. Please use Standard LoRA formats.
• Supported Formats:
  • ✅ Standard LoRA (Rank-Decomposed):
    • Supported weight keys:
      • lora_up.weight / lora_down.weight
      • lora.up.weight / lora.down.weight
      • lora_A.weight / lora_B.weight
      • lora.A.weight / lora.B.weight
    • These are the standard formats produced by Kohya-ss, Diffusers, and most training scripts.
  • ✅ PEFT Format LoRA (v2.3.8+):
    • Supported weight keys (examples):
      • lora_A.default.weight / lora_B.default.weight
      • lora.up.default.weight / lora.down.default.weight
    • Additional tags between lora_A/lora_B and .weight are supported (e.g. .default).
    • These formats are produced by the Hugging Face PEFT library. Support was added in v2.3.8 (PR #48).
  • ❌ LoKR (Lycoris): Not supported (Keys like lokr_w1, lokr_w2)
  • ❌ LoHa: Not supported (Keys like hada_w1, hada_w2)
  • ❌ IA3: Not supported
• Related Issues:
  • Issue #29 - LyCORIS / LoKr Qwen Image LoRA not recognized by ComfyUI
  • Issue #44 - [MISS] Module found but unsupported/missing proj_down/proj_up (performance slowdown issue fixed in v2.2.8)

context_refiner and noise_refiner Layer Support

• Status: ❌ Not Currently Supported
• Issue: LoRA keys for context_refiner and noise_refiner layers are not currently supported. These are specialized layers used in Z-Image-Turbo models for refiner functionality.
• Details:
  • ⚠️ Testing Limitation: We have not tested LoRAs that contain context_refiner and noise_refiner layers with actual models. The reason we cannot test them is that we do not know which LoRAs are in this format. If we can identify specific LoRAs that contain these layers, we can proceed with testing.
  • Without testing, we cannot determine if correct key mappings are possible for these layers. The current key mapping system does not include mappings for these layers, and they will not work at this time.
• Conclusion: Support for context_refiner and noise_refiner layers is not implemented because we have not been able to test LoRAs containing these layers. Even if we test them, it is unknown whether correct key mappings can be determined. Please use LoRAs that target the standard transformer layers only.
• Related Issues:
  • #41 - 无法加载context_refiner和noise_refiner层的参数

RES4LYF Sampler Compatibility Issue

• Status: ✅ Fixed in ComfyUI-nunchaku v1.0.2
• Issue: Device mismatch errors occurred when using RES4LYF sampler with LoRA (Issue #7, Issue #8)
• Fix: The issue was fixed in ComfyUI-nunchaku v1.0.2 by @devgdovg in PR #600. This fix was implemented in ComfyUI-nunchaku's codebase, not in this LoRA loader.
• Requirement: Update to ComfyUI-nunchaku v1.0.2 or later to use RES4LYF sampler with LoRA
• Related Issues:
  • Issue #7 - RES4LYF sampler device mismatch error
  • Issue #8 - RES4LYF sampler compatibility issue

Changelog

v2.4.3 (latest)

• Fixed: Z-Image / SVDQ crash with ComfyUI deferred (lazy) Linear weights (AttributeError: 'NoneType' object has no attribute 'dtype') by patching SVDQW4A4Linear.from_linear and fuse_to_svdquant_linear, including startup retries for load-order variance.
• Technical Details: See v2.4.3 Release Notes for complete explanation

v2.4.2

• Fixed: Qwen Image ControlNet (e.g. Fun ControlNet) with Nunchaku Qwen Image model — ComfyQwenImageWrapper now exposes process_img and forwards ControlNet-required attributes (patch_size, pe_embedder, img_in, txt_norm, txt_in, time_text_embed) to the inner model so Union ControlNet works when the base model is the wrapper.
• Fixed: RecursionError when accessing model_wrapper.model (e.g. in NunchakuQwenImageLoraStackV3) — __getattr__ now obtains the inner model via _modules instead of self.model to avoid infinite recursion.
• Technical Details: See v2.4.2 Release Notes for complete explanation

v2.4.1

• Added: Nunchaku Z-Image-Turbo LoRA Stack V1 with rgthree-style UI - Same layout as Qwen Image LoRA Stack V1: toggle, LoRA name, and strength per row. For official Nunchaku Z-Image loader only. Uses compose_loras_v2. Does not work properly with ComfyUI Nodes 2.0; when using with Nodes 2.0, pressing F5 to refresh will reflect changes.
• Related Issues: Issue #12 - Request for better LoRA option (rgthree-style UI), Issue #36 - Request for enabling/disabling LoRA function

v2.4.0

• Added: Nunchaku Qwen Image LoRA Stack V1 with rgthree-style UI - Clean, minimalist interface inspired by Power Lora Loader (rgthree-comfy). Toggle, LoRA name, and strength per row.
• Merged: PR #49 - feat(qwen_lora): add Nunchaku Qwen Image LoRA Stack V4 with rgthree-style UI (proposed by avan06)
• Note: Does not work properly with ComfyUI Nodes 2.0. Use the standard (LiteGraph) canvas.
• Related Issues: Issue #12 - Request for better LoRA option (rgthree-style UI), Issue #36 - Request for enabling/disabling LoRA function
• Technical Details: See v2.4.0 Release Notes for complete explanation

Previous Releases (v2.3.0 to v2.3.9)

For detailed release notes from v2.3.0 to v2.3.9, please see RELEASE_NOTES_V2.3.0_TO_V2.3.9.md.

This document contains comprehensive information about all bug fixes, features, and technical details for these versions of the project.

Previous Releases (v1.6.0 to v2.2.8)

For detailed release notes from v1.6.0 to v2.2.8, please see RELEASE_NOTES_V1.6.0_TO_V2.2.8.md.

This document contains comprehensive information about all bug fixes, features, and technical details for these versions of the project.

Previous Releases (v1.0.0 to v1.57)

For detailed release notes from v1.0.0 to v1.57, please see RELEASE_NOTES_V1.0.0_TO_V1.57.md.

This document contains comprehensive information about all bug fixes, features, and technical details for earlier versions of the project.

License

This project is licensed under the MIT License.