tf.nn.sparse_softmax_cross_entropy_with_logits

Computes sparse softmax cross entropy between logits and labels.

tf.nn.sparse_softmax_cross_entropy_with_logits(
    labels, logits, name=None
)

Used in the notebooks

Used in the guide Used in the tutorials

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.

A common use case is to have logits of shape [batch_size, num_classes] and have labels of shape [batch_size], but higher dimensions are supported, in which case the dim-th dimension is assumed to be of size num_classes. logits must have the dtype of float16, float32, or float64, and labels must have the dtype of int32 or int64.

logits = tf.constant([[2., -5., .5, -.1],
                      [0., 0., 1.9, 1.4],
                      [-100., 100., -100., -100.]])
labels = tf.constant([0, 3, 1])
tf.nn.sparse_softmax_cross_entropy_with_logits(
    labels=labels, logits=logits).numpy()
array([0.29750752, 1.1448325 , 0.        ], dtype=float32)

To avoid confusion, passing only named arguments to this function is recommended.

labels Tensor of shape [d_0, d_1, ..., d_{r-1}] (where r is rank of labels and result) and dtype int32 or int64. Each entry in labels must be an index in [0, num_classes). Other values will raise an exception when this op is run on CPU, and return NaN for corresponding loss and gradient rows on GPU.
logits Unscaled log probabilities of shape [d_0, d_1, ..., d_{r-1}, num_classes] and dtype float16, float32, or float64.
name A name for the operation (optional).

A Tensor of the same shape as labels and of the same type as logits with the softmax cross entropy loss.

ValueError If logits are scalars (need to have rank >= 1) or if the rank of the labels is not equal to the rank of the logits minus one.