ExpandDims

public final class ExpandDims

Inserts a dimension of 1 into a tensor's shape.

Given a tensor `input`, this operation inserts a dimension of 1 at the dimension index `axis` of `input`'s shape. The dimension index `axis` starts at zero; if you specify a negative number for `axis` it is counted backward from the end.

This operation is useful if you want to add a batch dimension to a single element. For example, if you have a single image of shape `[height, width, channels]`, you can make it a batch of 1 image with `expand_dims(image, 0)`, which will make the shape `[1, height, width, channels]`.

Other examples: 

# 't' is a tensor of shape [2]
 shape(expand_dims(t, 0)) ==> [1, 2]
 shape(expand_dims(t, 1)) ==> [2, 1]
 shape(expand_dims(t, -1)) ==> [2, 1]
 
 # 't2' is a tensor of shape [2, 3, 5]
 shape(expand_dims(t2, 0)) ==> [1, 2, 3, 5]
 shape(expand_dims(t2, 2)) ==> [2, 3, 1, 5]
 shape(expand_dims(t2, 3)) ==> [2, 3, 5, 1]
This operation requires that:

`-1-input.dims() <= dim <= input.dims()`

This operation is related to `squeeze()`, which removes dimensions of size 1.

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.
static <T extends TType> ExpandDims<T>
create(Scope scope, Operand<T> input, Operand<? extends TNumber> axis)
Factory method to create a class wrapping a new ExpandDims operation.
Output<T>
output()
Contains the same data as `input`, but its shape has an additional dimension of size 1 added.

Inherited Methods

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()
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()
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.
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
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: "ExpandDims"

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 static ExpandDims<T> create (Scope scope, Operand<T> input, Operand<? extends TNumber> axis)

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

Parameters
scope current scope
axis 0-D (scalar). Specifies the dimension index at which to expand the shape of `input`. Must be in the range `[-rank(input) - 1, rank(input)]`.
Returns
  • a new instance of ExpandDims

public Output<T> output ()

Contains the same data as `input`, but its shape has an additional dimension of size 1 added.