/TensorFlow Python



Defined in tensorflow/python/ops/nn_ops.py.

See the guide: Neural Network > Classification

Computes softmax cross entropy between logits and labels. (deprecated)

THIS FUNCTION IS DEPRECATED. It will be removed in a future version. Instructions for updating:

Future major versions of TensorFlow will allow gradients to flow into the labels input on backprop by default.

See tf.nn.softmax_cross_entropy_with_logits_v2.

Measures the probability error in discrete classification tasks in which the classes are mutually exclusive (each entry is in exactly one class). For example, each CIFAR-10 image is labeled with one and only one label: an image can be a dog or a truck, but not both.

NOTE: While the classes are mutually exclusive, their probabilities need not be. All that is required is that each row of labels is a valid probability distribution. If they are not, the computation of the gradient will be incorrect.

If using exclusive labels (wherein one and only one class is true at a time), see sparse_softmax_cross_entropy_with_logits.

WARNING: This op expects unscaled logits, since it performs a softmax on logits internally for efficiency. Do not call this op with the output of softmax, as it will produce incorrect results.

logits and labels must have the same shape, e.g. [batch_size, num_classes] and the same dtype (either float16, float32, or float64).

Backpropagation will happen only into logits. To calculate a cross entropy loss that allows backpropagation into both logits and labels, see tf.nn.softmax_cross_entropy_with_logits_v2.

Note that to avoid confusion, it is required to pass only named arguments to this function.


  • _sentinel: Used to prevent positional parameters. Internal, do not use.
  • labels: Each row labels[i] must be a valid probability distribution.
  • logits: Unscaled log probabilities.
  • dim: The class dimension. Defaulted to -1 which is the last dimension.
  • name: A name for the operation (optional).


A 1-D Tensor of length batch_size of the same type as logits with the softmax cross entropy loss.

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Licensed under the Creative Commons Attribution License 3.0.
Code samples licensed under the Apache 2.0 License.