Contrastive Loss outputs negative loss values

[Tamar Elazari]

Hi all,

 It seems I have a problem with the  Contrastive Loss layer, it outputs negative values in training.

I0426 12:05:25.999092 26389 solver.cpp:222] Iteration 900, loss = -0.015

this is my layer:

layer {

  name: "loss"

  type: "ContrastiveLoss"

  bottom: "feat"

  bottom: "feat_p"

  bottom: "sim_labels"

  top: "loss"

  contrastive_loss_param {

    margin: 1

  }

}

what am I doing wrong?

* the problem is also described here https://github.com/BVLC/caffe/issues/2308

and later here https://github.com/BVLC/caffe/pull/2321

but it doesn't seem to be fixed, since i am getting negative values...