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Generates labels for candidate sampling with a log-uniform distribution.

See explanations of candidate sampling and the data formats at go/candidate-sampling.

For each batch, this op picks a single set of sampled candidate labels.

The advantages of sampling candidates per-batch are simplicity and the possibility of efficient dense matrix multiplication. The disadvantage is that the sampled candidates must be chosen independently of the context and of the true labels.

true_classes A Tensor of type int64. A batch_size * num_true matrix, in which each row contains the IDs of the num_true target_classes in the corresponding original label.
num_true An int that is >= 1. Number of true labels per context.
num_sampled An int that is >= 1. Number of candidates to randomly sample.
unique A bool. If unique is true, we sample with rejection, so that all sampled candidates in a batch are unique. This requires some approximation to estimate the post-rejection sampling probabilities.
range_max An int that is >= 1. The sampler will sample integers from the interval [0, range_max).
seed An optional int. Defaults to 0. If either seed or seed2 are set to be non-zero, the random number generator is seeded by the given seed. Otherwise, it is seeded by a random seed.
seed2 An optional int. Defaults to 0. An second seed to avoid seed collision.
name A name for the operation (optional).

A tuple of Tensor objects (sampled_candidates, true_expected_count, sampled_expected_count).
sampled_candidates A Tensor of type int64.
true_expected_count A Tensor of type float32.
sampled_expected_count A Tensor of type float32.