Function sparseCategoricalAccuracy

Sparse categorical accuracy metric function.

Example:

const yTrue = tf.tensor1d([1, 1, 2, 2, 0]);
const yPred = tf.tensor2d(
     [[0, 1, 0], [1, 0, 0], [0, 0.4, 0.6], [0, 0.6, 0.4], [0.7, 0.3, 0]]);
const crossentropy = tf.metrics.sparseCategoricalAccuracy(yTrue, yPred);
crossentropy.print();
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