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I actually tried that a few hours after posting. And I was puzzled by what I saw. Keras did not give me an error, but the loss went immediately to NaN. Eventually I solved the problem. The calling convention for a Keras loss function is first y_true, then y_pred -- or as I call them, tgt and pred. But the calling convention for a TensorFlow loss function is pred first, then tgt. So this fix works: def keras_l2_angle_distance(tgt, pred): return l2_angle_distance(pred, tgt). Maybe Theano or CNTK uses the same order as Keras, I don't know. But I'm back in business.
– John Ladasky
Commented Jan 2, 2018 at 6:57

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