How to change classification loss function

[PacteraOliver]

I found #438 and #257 asked about the loss function issues.

I want to know how to change the loss function for a certain network.

I found that the loss function is now written in caffe2 select_smooth_l1_loss_op.h

Is there a way to change it or define by our self?

Thank you.

[ir413]

Hi @PacteraOliver, you can change the classification loss function here. You may also find it useful to look at the following functions that are used to define the losses for different tasks: fast_rcnn_losses, mask_rcnn_losses and keypoint_rcnn_losses.