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# tf.contrib.metrics.streaming_sparse_average_precision_at_top_k

Computes average precision@k of predictions with respect to sparse labels.

`streaming_sparse_average_precision_at_top_k` creates two local variables, `average_precision_at_<k>/total` and `average_precision_at_<k>/max`, that are used to compute the frequency. This frequency is ultimately returned as `average_precision_at_<k>`: an idempotent operation that simply divides `average_precision_at_<k>/total` by `average_precision_at_<k>/max`.

For estimation of the metric over a stream of data, the function creates an `update_op` operation that updates these variables and returns the `precision_at_<k>`. Set operations applied to `top_k` and `labels` calculate the true positives and false positives weighted by `weights`. Then `update_op` increments `true_positive_at_<k>` and `false_positive_at_<k>` using these values.

If `weights` is `None`, weights default to 1. Use weights of 0 to mask values.

`top_k_predictions` Integer `Tensor` with shape [D1, ... DN, k] where N >= 1. Commonly, N=1 and `predictions_idx` has shape [batch size, k]. The final dimension must be set and contains the top `k` predicted class indices. [D1, ... DN] must match `labels`. Values should be in range [0, num_classes).
`labels` `int64` `Tensor` or `SparseTensor` with shape [D1, ... DN, num_labels] or [D1, ... DN], where the latter implies num_labels=1. N >= 1 and num_labels is the number of target classes for the associated prediction. Commonly, N=1 and `labels` has shape [batch_size, num_labels]. [D1, ... DN] must match `top_k_predictions`. Values should be in range [0, num_classes).
`weights` `Tensor` whose rank is either 0, or n-1, where n is the rank of `labels`. If the latter, it must be broadcastable to `labels` (i.e., all dimensions must be either `1`, or the same as the corresponding `labels` dimension).
`metrics_collections` An optional list of collections that values should be added to.
`updates_collections` An optional list of collections that updates should be added to.
`name` Name of new update operation, and namespace for other dependent ops.

`mean_average_precision` Scalar `float64` `Tensor` with the mean average precision values.
`update` `Operation` that increments variables appropriately, and whose value matches `metric`.

`ValueError` if the last dimension of top_k_predictions is not set.

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