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tfr.keras.utils.pow_minus_1

Computes 2**x - 1 element-wise for each label.

Can be used to define gain_fn for tfr.keras.metrics.NDCGMetric.

label A Tensor or anything that can be converted to a tensor using tf.convert_to_tensor.

A Tensor that has each input element transformed as x to 2**x - 1.