tf.math.invert_permutation  |  TensorFlow v2.16.1 (original) (raw)

tf.math.invert_permutation

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Computes the inverse permutation of a tensor.

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Compat aliases for migration

SeeMigration guide for more details.

tf.compat.v1.invert_permutation, tf.compat.v1.math.invert_permutation

tf.math.invert_permutation(
    x: Annotated[Any, TV_InvertPermutation_T], name=None
) -> Annotated[Any, TV_InvertPermutation_T]

This operation computes the inverse of an index permutation. It takes a 1-D integer tensor x, which represents the indices of a zero-based array, and swaps each value with its index position. In other words, for an output tensory and an input tensor x, this operation computes the following:

y[x[i]] = i for i in [0, 1, ..., len(x) - 1]

The values must include 0. There can be no duplicate values or negative values.

For example:

# tensor `x` is [3, 4, 0, 2, 1]
invert_permutation(x) ==> [2, 4, 3, 0, 1]