WARNING Identity Transfer Failed using Knowledge Transfer

[Carolyn Tett]

Hello,

I am using knowledge transfer between two videos of the same group of fish. My first question is, by using knowledge transfer, if a fish is assigned identification number 1 in one video, will the same fish be assigned the same number in the second video?

While using knowledge transfer, I came across this error: "WARNING Identity transfer failed: The computed identities P1 is below random. We proceed by reinitializing fully connected layers, assigning random identities to the first GlobalFragment and transferring only the convolutional filters (knowledge transfer)". Does this error mean that the fish identified as 1 in one video will no longer be identified as 1 in the other video unless by chance? 

Thank you in advance,

Carolyn

[idtracker.ai]

Hello Carolyn,

Thanks for reaching out. Knowledge transfer does not transfer identities, this is, if a fish is assigned to identification number 1 in one video, it won't necessarily be assigned to number 1 in the second video. Knowledge transfer only sets the initial weights of the identification network to obtain a speedup in the first training step compared to initializing the network with random weights (the default). Identity transfer (another option in the software) does keep identities between videos and it requires knowledge transfer to work.

If you see the warning "Identity transfer failed" it means that it was not possible to transfer identities but the knowledge transfer still holds. That means the identities will not be coherent between videos.

In the current version of idtrackerai, identity transfer is very picky and weak. We are fixing this for the next release of the software which should see the light of the day in one or two months.

Sorry for the inconvenience,

Jordi

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