Float Unary Condition JK🐉

CM_FloatUnaryCondition asks a single float a yes/no question and returns a BOOLEAN. The op dropdown has eleven questions: IsZero, IsPositive, IsNegative, IsNonZero, IsPositiveInfinity, IsNegativeInfinity, IsNaN, IsFinite, IsInfinite, IsEven, IsOdd.

The two that are worth the most column inches are IsNaN and IsFinite - because those are the ones that save your run.

The NaN guard

Denoising pipelines occasionally cough up a nan or inf - a bad VAE decode, a division by a near-zero denoiser, a sampler edge case. The failure mode isn't a helpful error; it's a silently black image or a crash three nodes later. Wiring IsNaN (or the inverse, IsFinite) after any float-producing step turns "garbage value" into a boolean you can branch on: retry with a different seed, clamp the value, or skip the bad path. It's the cheapest insurance a graph can buy, and almost no stock ComfyUI install ships it.

The other operators are the float-world versions of the integer conditions: IsZero/IsNonZero for "did anything come through," IsPositive/IsNegative for direction checks. IsEven/IsOdd work on floats here by testing the remainder - fine for whole-valued floats, meaningless for 0.3, so don't lean on them.

Installing it

Ships with ComfyUI-JakeUpgrade:

cd ComfyUI/custom_nodes
git clone https://github.com/jakechai/ComfyUI-JakeUpgrade
cd ComfyUI-JakeUpgrade
# Windows standalone: install.bat
# or: python_embeded\python.exe -s -m pip install -r requirements.txt
pip install -r requirements.txt   # non-Windows

Or ComfyUI Manager, search "JakeUpgrade", install, restart.

Gotchas

• IsZero on computed floats is a trap. Floating-point math makes exact == 0.0 rare after any arithmetic; prefer IsNonZero with a threshold comparison (Gt/Lt in CM_FloatBinaryCondition) for "close to zero."
• NaN never equals anything, including itself - but the IsNaN check is written explicitly, so it catches what an Eq comparison would miss. That's exactly why this node exists.
• Manager's JakeUpgrade / IPAdapter_plus conflict warning is a false positive from the pack's replacement/ folder.
• ComfyUI-MultiGPU causes CUDA errors with recent ComfyUI - disable it per the README.