ToHashBucketStrong

public final class ToHashBucketStrong

Converts each string in the input Tensor to its hash mod by a number of buckets.

The hash function is deterministic on the content of the string within the process. The hash function is a keyed hash function, where attribute `key` defines the key of the hash function. `key` is an array of 2 elements.

A strong hash is important when inputs may be malicious, e.g. URLs with additional components. Adversaries could try to make their inputs hash to the same bucket for a denial-of-service attack or to skew the results. A strong hash can be used to make it difficult to find inputs with a skewed hash value distribution over buckets. This requires that the hash function is seeded by a high-entropy (random) "key" unknown to the adversary.

The additional robustness comes at a cost of roughly 4x higher compute time than `tf.string_to_hash_bucket_fast`.

Examples:

>>> tf.strings.to_hash_bucket_strong(["Hello", "TF"], 3, [1, 2]).numpy() array([2, 0])

Constants

String

OP_NAME

The name of this op, as known by TensorFlow core engine

Public Methods

Output<TInt64>	asOutput() Returns the symbolic handle of the tensor.
static ToHashBucketStrong	create(Scope scope, Operand<TString> input, Long numBuckets, List<Long> key) Factory method to create a class wrapping a new ToHashBucketStrong operation.
Output<TInt64>	output() A Tensor of the same shape as the input `string_tensor`.

Inherited Methods

From class org.tensorflow.op.RawOp

final boolean	equals(Object obj)
final int	hashCode()
Operation	op() Return this unit of computation as a single Operation.
final String	toString()

From class java.lang.Object

boolean	equals(Object arg0)
final Class<?>	getClass()
int	hashCode()
final void	notify()
final void	notifyAll()
String	toString()
final void	wait(long arg0, int arg1)
final void	wait(long arg0)
final void	wait()

From interface org.tensorflow.op.Op

abstract ExecutionEnvironment	env() Return the execution environment this op was created in.
abstract Operation	op() Return this unit of computation as a single Operation.

From interface org.tensorflow.Operand

abstract Output<TInt64>	asOutput() Returns the symbolic handle of the tensor.
abstract TInt64	asTensor() Returns the tensor at this operand.
abstract Shape	shape() Returns the (possibly partially known) shape of the tensor referred to by the Output of this operand.
abstract Class<TInt64>	type() Returns the tensor type of this operand

From interface org.tensorflow.ndarray.Shaped

abstract int	rank()
abstract Shape	shape()
abstract long	size() Computes and returns the total size of this container, in number of values.

Constants

public static final String OP_NAME

The name of this op, as known by TensorFlow core engine

Constant Value: "StringToHashBucketStrong"

Public Methods

public Output<TInt64> asOutput ()

Returns the symbolic handle of the tensor.

Inputs to TensorFlow operations are outputs of another TensorFlow operation. This method is used to obtain a symbolic handle that represents the computation of the input.

public static ToHashBucketStrong create (Scope scope, Operand<TString> input, Long numBuckets, List<Long> key)

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

Parameters

scope	current scope
input	The strings to assign a hash bucket.
numBuckets	The number of buckets.
key	The key used to seed the hash function, passed as a list of two uint64 elements.

Returns

• a new instance of ToHashBucketStrong

public Output<TInt64> output ()

A Tensor of the same shape as the input `string_tensor`.