custom_nodes/ComfyUI_experiments/__init__.py

import importlib
import os

node_list = [ #Add list of .py files containing nodes here
    "advanced_model_merging",
    "reference_only",
    "sampler_rescalecfg",
    "sampler_tonemap",
    "sampler_tonemap_rescalecfg",
    "sdxl_model_merging"
]

NODE_CLASS_MAPPINGS = {}
NODE_DISPLAY_NAME_MAPPINGS = {}

for module_name in node_list:
    imported_module = importlib.import_module(".{}".format(module_name), __name__)

    NODE_CLASS_MAPPINGS = {**NODE_CLASS_MAPPINGS, **imported_module.NODE_CLASS_MAPPINGS}
    if hasattr(imported_module, "NODE_DISPLAY_NAME_MAPPINGS"):
        NODE_DISPLAY_NAME_MAPPINGS = {**NODE_DISPLAY_NAME_MAPPINGS, **imported_module.NODE_DISPLAY_NAME_MAPPINGS}

__all__ = ['NODE_CLASS_MAPPINGS', 'NODE_DISPLAY_NAME_MAPPINGS']