BandPart

public final class BandPart

Copy a tensor setting everything outside a central band in each innermost matrix to zero.

The `band` part is computed as follows: Assume `input` has `k` dimensions `[I, J, K, ..., M, N]`, then the output is a tensor with the same shape where

`band[i, j, k, ..., m, n] = in_band(m, n) * input[i, j, k, ..., m, n]`.

The indicator function

`in_band(m, n) = (num_lower < 0 || (m-n) <= num_lower)) && (num_upper < 0 || (n-m) <= num_upper)`.

For example:

# if 'input' is [[ 0,  1,  2, 3]
                  [-1,  0,  1, 2]
                  [-2, -1,  0, 1]
                  [-3, -2, -1, 0]],
 
 tf.matrix_band_part(input, 1, -1) ==> [[ 0,  1,  2, 3]
                                        [-1,  0,  1, 2]
                                        [ 0, -1,  0, 1]
                                        [ 0,  0, -1, 0]],
 
 tf.matrix_band_part(input, 2, 1) ==> [[ 0,  1,  0, 0]
                                       [-1,  0,  1, 0]
                                       [-2, -1,  0, 1]
                                       [ 0, -2, -1, 0]]
 

Useful special cases:

tf.matrix_band_part(input, 0, -1) ==> Upper triangular part.
  tf.matrix_band_part(input, -1, 0) ==> Lower triangular part.
  tf.matrix_band_part(input, 0, 0) ==> Diagonal.
 

Constants

String

OP_NAME

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

Public Methods

Output<T>	asOutput() Returns the symbolic handle of the tensor.
Output<T>	band() Rank `k` tensor of the same shape as input.
static <T extends TType, U extends TNumber> BandPart<T>	create(Scope scope, Operand<T> input, Operand<U> numLower, Operand<U> numUpper) Factory method to create a class wrapping a new BandPart operation.

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<T>	asOutput() Returns the symbolic handle of the tensor.
abstract T	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<T>	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: "MatrixBandPart"

Public Methods

public Output<T> 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 Output<T> band ()

Rank `k` tensor of the same shape as input. The extracted banded tensor.

public static BandPart<T> create (Scope scope, Operand<T> input, Operand<U> numLower, Operand<U> numUpper)

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

Parameters

scope	current scope
input	Rank `k` tensor.
numLower	0-D tensor. Number of subdiagonals to keep. If negative, keep entire lower triangle.
numUpper	0-D tensor. Number of superdiagonals to keep. If negative, keep entire upper triangle.

Returns

• a new instance of BandPart