# tf.contrib.gan.eval.classifier_score

### Aliases:

• tf.contrib.gan.eval.classifier_metrics.classifier_score
• tf.contrib.gan.eval.classifier_score
tf.contrib.gan.eval.classifier_score(
images,
classifier_fn,
num_batches=1
)


Classifier score for evaluating a conditional generative model.

This is based on the Inception Score, but for an arbitrary classifier.

This technique is described in detail in https://arxiv.org/abs/1606.03498. In summary, this function calculates

exp( E[ KL(p(y|x) || p(y)) ] )

which captures how different the network's classification prediction is from the prior distribution over classes.

NOTE: This function consumes images, computes their logits, and then computes the classifier score. If you would like to precompute many logits for large batches, use classifier_score_from_logits(), which this method also uses.

#### Args:

• images: Images to calculate the classifier score for.
• classifier_fn: A function that takes images and produces logits based on a classifier.
• num_batches: Number of batches to split generated_images in to in order to efficiently run them through the classifier network.

#### Returns:

The classifier score. A floating-point scalar of the same type as the output of classifier_fn.