Just switched from CPU to TPU - cpai 2.8.0, BI

[scoob8000]

Running blue iris with default ai settings in config. Cams analyze a few images per trigger only looking for a handful of objects (person,dog,cat, car, etc)

Since switching to TPU (TF lite) processing is waaay faster but accuracy has dropped. I'm getting a lot of fairly confident (60+%) detections that are wrong. Inanimate objects in the yard as person, dog as a bird, a deer last night as a rabbit. Most camd are around 50% to confirm.

I'd occasionally get incorrect ones with CPU, but nothing like this.

Is that the nature of the beast with the TPU model? I'm not sure what size model it's using either. Just the default when I installed the coral module.

Open to suggestions.

 

[wittaj]

Yep that is pretty common. Many that tried TPU went back. Faster isn't always better!

 

[scoob8000]

Yep that is pretty common. Many that tried TPU went back. Faster isn't always better!

Man if that's the case I'm so disappointed for wasting money.

Some of these detections are beyond useless.

Car drives by, it's not detected but 20 or so people are, where there's nothing resembling a person.


Hopefully someone can chime in with a tweak or setting to try.

 

[wittaj]

The tweak is to remove the TPU and use the CPU LOL

What times were you getting with CPU? If the TPU isn't saving you more than 2 seconds, what is more important speed or accuracy?

 

[scoob8000]

The tweak is to remove the TPU and use the CPU LOL

What times were you getting with CPU? If the TPU isn't saving you more than 2 seconds, what is more important speed or accuracy?

Anywhere from 800-1500ms.

 

[wittaj]

I wouldn't think for most use cases 1.5 seconds is too long to wait for accurate detection?