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Computes the npairs loss between y_true and y_pred.

Npairs loss expects paired data where a pair is composed of samples from the same labels and each pairs in the minibatch have different labels. The loss takes each row of the pair-wise similarity matrix, y_pred, as logits and the remapped multi-class labels, y_true, as labels.

The similarity matrix y_pred between two embedding matrices a and b with shape [batch_size, hidden_size] can be computed as follows:

# y_pred = a * b^T
y_pred = tf.matmul(a, b, transpose_a=False, transpose_b=True)


y_true 1-D integer Tensor with shape [batch_size] of multi-class labels.
y_pred 2-D float Tensor with shape [batch_size, batch_size] of similarity matrix between embedding matrices.

npairs_loss float scalar.