Bug: ImportError: cannot import name 'pad' from 'kornia.geometry.transform.pyramid' (Breaks on latest ComfyUI)

[axiomgraph]

Since the custom node pack fails to load, every workflow that depends on this node pack is completely broken and cannot render.

Traceback (most recent call last): File "C:\Users\Axiomgraph\Downloads\ComfyUI_windows_portable\ComfyUI\nodes.py", line 2247, in load_custom_node module_spec.loader.exec_module(module) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^ File "", line 1023, in exec_module File "", line 488, in call_with_frames_removed File "C:\Users\Axiomgraph\Downloads\ComfyUI_windows_portable\ComfyUI\custom_nodes\ComfyUI-LTXVideo_init.py", line 49, in from .pyramid_blending import LTXVLaplacianPyramidBlend File "C:\Users\Axiomgraph\Downloads\ComfyUI_windows_portable\ComfyUI\custom_nodes\ComfyUI-LTXVideo\pyramid_blending.py", line 7, in from kornia.geometry.transform.pyramid import ( ...<6 lines>... ) ImportError: cannot import name 'pad' from 'kornia.geometry.transform.pyramid' (C:\Users\Axiomgraph\Downloads\ComfyUI_windows_portable\python_embeded\Lib\site-packages\kornia\geometry\transform\pyramid.py)

[charlyarias65]

same problem after update

[dadleo]

uninstall kornia
then reinstall
kornia==0.8.2

[MartinT23]

Fixed removing the Pad import:

Same issue here on a fresh Manager install. The pack fails to import at startup:
ImportError: cannot import name 'pad' from 'kornia.geometry.transform.pyramid'

Cause: kornia used to have a module-level "from torch.nn.functional import pad", so the name leaked out and was importable. As of kornia 0.8.3 it is no longer re-exported. All the other names in that import list still resolve fine, so pad is the only one affected.

Current code at the top of pyramid_blending.py:

import comfy.model_management
import torch
import torch.nn.functional as F
from comfy_api.latest import io
from kornia.geometry.transform.pyramid import (
PyrUp,
build_laplacian_pyramid,
build_pyramid,
find_next_powerof_two,
is_powerof_two,
pad,
)

Workaround, which fixes the load with no behavior change since torch.nn.functional is already imported as F:

import comfy.model_management
import torch
import torch.nn.functional as F
from comfy_api.latest import io
from kornia.geometry.transform.pyramid import (
PyrUp,
build_laplacian_pyramid,
build_pyramid,
find_next_powerof_two,
is_powerof_two,
)

pad = F.pad

Suggested fix: import pad from torch.nn.functional instead of relying on the kornia re-export. Probably better than pinning kornia in requirements.txt, since kornia is shared in a ComfyUI venv (mine is also required by pixeloe and transparent-background) and pinning it back could break other node packs.