Unique

public final class Unique

Finds unique elements along an axis of a tensor.

This operation either returns a tensor `y` containing unique elements along the `axis` of a tensor. The returned unique elements is sorted in the same order as they occur along `axis` in `x`. This operation also returns a tensor `idx` that is the same size as the number of the elements in `x` along the `axis` dimension. It contains the index in the unique output `y`. In other words, for an `1-D` tensor `x` with `axis = None:

`y[idx[i]] = x[i] for i in [0, 1,...,rank(x) - 1]`

For example: 

# tensor 'x' is [1, 1, 2, 4, 4, 4, 7, 8, 8]
 y, idx = unique(x)
 y ==> [1, 2, 4, 7, 8]
 idx ==> [0, 0, 1, 2, 2, 2, 3, 4, 4]
For an `2-D` tensor `x` with `axis = 0`: 
# tensor 'x' is [[1, 0, 0],
 #                [1, 0, 0],
 #                [2, 0, 0]]
 y, idx = unique(x, axis=0)
 y ==> [[1, 0, 0],
        [2, 0, 0]]
 idx ==> [0, 0, 1]
For an `2-D` tensor `x` with `axis = 1`: 
# tensor 'x' is [[1, 0, 0],
 #                [1, 0, 0],
 #                [2, 0, 0]]
 y, idx = unique(x, axis=1)
 y ==> [[1, 0],
        [1, 0],
        [2, 0]]
 idx ==> [0, 1, 1]

Public Methods

static <T, V extends Number, U extends Number> Unique<T, V>
create(Scope scope, Operand<T> x, Operand<U> axis, Class<V> outIdx)
Factory method to create a class wrapping a new Unique operation.
static <T, U extends Number> Unique<T, Integer>
create(Scope scope, Operand<T> x, Operand<U> axis)
Factory method to create a class wrapping a new Unique operation using default output types.
Output<V>
idx()
A 1-D Tensor.
Output<T>
y()
A `Tensor`.

Inherited Methods

Public Methods

public static Unique<T, V> create (Scope scope, Operand<T> x, Operand<U> axis, Class<V> outIdx)

Factory method to create a class wrapping a new Unique operation.

Parameters
scope current scope
x A `Tensor`.
axis A `Tensor` of type `int32` (default: None). The axis of the Tensor to find the unique elements.
Returns
  • a new instance of Unique

public static Unique<T, Integer> create (Scope scope, Operand<T> x, Operand<U> axis)

Factory method to create a class wrapping a new Unique operation using default output types.

Parameters
scope current scope
x A `Tensor`.
axis A `Tensor` of type `int32` (default: None). The axis of the Tensor to find the unique elements.
Returns
  • a new instance of Unique

public Output<V> idx ()

A 1-D Tensor. Has the same type as x that contains the index of each value of x in the output y.

public Output<T> y ()

A `Tensor`. Unique elements along the `axis` of `Tensor` x.