-- Hoogle documentation, generated by Haddock -- See Hoogle, http://www.haskell.org/hoogle/ -- | Friendly layer around TensorFlow bindings. -- -- Please see README.md @package tensorflow-nn @version 0.1.0.0 module TensorFlow.NN -- | Computes sigmoid cross entropy given logits. -- -- Measures the probability error in discrete classification tasks in -- which each class is independent and not mutually exclusive. For -- instance, one could perform multilabel classification where a picture -- can contain both an elephant and a dog at the same time. -- -- For brevity, let `x = logits`, `z = targets`. The logistic loss is -- -- z * -log(sigmoid(x)) + (1 - z) * -log(1 - sigmoid(x)) = z * -log(1 -- (1 + exp(-x))) + (1 - z) * -log(exp(-x) (1 + exp(-x))) = z * -- log(1 + exp(-x)) + (1 - z) * (-log(exp(-x)) + log(1 + exp(-x))) = z * -- log(1 + exp(-x)) + (1 - z) * (x + log(1 + exp(-x)) = (1 - z) * x + -- log(1 + exp(-x)) = x - x * z + log(1 + exp(-x)) -- -- For x < 0, to avoid overflow in exp(-x), we reformulate the above -- -- x - x * z + log(1 + exp(-x)) = log(exp(x)) - x * z + log(1 + exp(-x)) -- = - x * z + log(1 + exp(x)) -- -- Hence, to ensure stability and avoid overflow, the implementation uses -- this equivalent formulation -- -- max(x, 0) - x * z + log(1 + exp(-abs(x))) -- -- logits and targets must have the same type and -- shape. sigmoidCrossEntropyWithLogits :: (OneOf '[Float, Double] a, TensorType a, Num a) => Tensor Value a -> Tensor Value a -> Build (Tensor Value a)