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Focal Loss

Lin, T.-Y., Goyal, P., Girshick, R., He, K., & Dollár, P. (2017). Focal Loss for Dense Object Detection, 130(4), 485–491. https://doi.org/10.1016/j.ajodo.2005.02.022

Implementation for focal loss in tensorflow.

This focal loss is a little different from the original one described in paper. This one is for multi-class classification tasks other than binary classifications.

The input are softmax-ed probabilities.

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