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Model Merging

:material-image-off: Model Merging

How to Merge Models

As of version 2.3, InvokeAI comes with a script that allows you to merge two or three diffusers-type models into a new merged model. The resulting model will combine characteristics of the original, and can be used to teach an old model new tricks.

You may run the merge script by starting the invoke launcher (invoke.sh or invoke.bat) and choosing the option for merge models. This will launch a text-based interactive user interface that prompts you to select the models to merge, how to merge them, and the merged model name.

Alternatively you may activate InvokeAI's virtual environment from the command line, and call the script via merge_models --gui to open up a version that has a nice graphical front end. To get the commandline- only version, omit --gui.

The user interface for the text-based interactive script is straightforward. It shows you a series of setting fields. Use control-N (^N) to move to the next field, and control-P (^P) to move to the previous one. You can also use TAB and shift-TAB to move forward and backward. Once you are in a multiple choice field, use the up and down cursor arrows to move to your desired selection, and press or to select it. Change text fields by typing in them, and adjust scrollbars using the left and right arrow keys.

Once you are happy with your settings, press the OK button. Note that there may be two pages of settings, depending on the height of your screen, and the OK button may be on the second page. Advance past the last field of the first page to get to the second page, and reverse this to get back.

If the merge runs successfully, it will create a new diffusers model under the selected name and register it with InvokeAI.

The Settings

  • Model Selection -- there are three multiple choice fields that display all the diffusers-style models that InvokeAI knows about. If you do not see the model you are looking for, then it is probably a legacy checkpoint model and needs to be converted using the invoke command-line client and its !optimize command. You must select at least two models to merge. The third can be left at "None" if you desire.

  • Alpha -- This is the ratio to use when combining models. It ranges from 0 to 1. The higher the value, the more weight is given to the 2d and (optionally) 3d models. So if you have two models named "A" and "B", an alpha value of 0.25 will give you a merged model that is 25% A and 75% B.

  • Interpolation Method -- This is the method used to combine weights. The options are "weighted_sum" (the default), "sigmoid", "inv_sigmoid" and "add_difference". Each produces slightly different results. When three models are in use, only "add_difference" is available. (TODO: cite a reference that describes what these interpolation methods actually do and how to decide among them).

  • Force -- Not all models are compatible with each other. The merge script will check for compatibility and refuse to merge ones that are incompatible. Set this checkbox to try merging anyway.

  • Name for merged model - This is the name for the new model. Please use InvokeAI conventions - only alphanumeric letters and the characters ".+-".