Reverse

tensorflow C++ API

tensorflow::ops::Reverse

Reverses specific dimensions of a tensor.

Summary

NOTEtf.reversehas now changed behavior in preparation for 1.0.tf.reverse_v2is currently an alias that will be deprecated before TF 1.0.

Given atensor, and aint32tensoraxisrepresenting the set of dimensions oftensorto reverse. This operation reverses each dimensionifor which there existsjs.t.axis[j] == i.

tensorcan have up to 8 dimensions. The number of dimensions specified inaxismay be 0 or more entries. If an index is specified more than once, a InvalidArgument error is raised.

For example:

``` tensor ‘t’ is [[[[ 0, 1, 2, 3],

[ 4, 5, 6, 7],

[ 8, 9, 10, 11]],

[[12, 13, 14, 15],

[16, 17, 18, 19],

[20, 21, 22, 23]]]]

tensor ‘t’ shape is [1, 2, 3, 4]

‘dims’ is [3] or ‘dims’ is -1

reverse(t, dims) ==> [[[[ 3, 2, 1, 0], [ 7, 6, 5, 4], [ 11, 10, 9, 8]], [[15, 14, 13, 12], [19, 18, 17, 16], [23, 22, 21, 20]]]]

‘dims’ is ‘[1]’ (or ‘dims’ is ‘[-3]’)

reverse(t, dims) ==> [[[[12, 13, 14, 15], [16, 17, 18, 19], [20, 21, 22, 23] [[ 0, 1, 2, 3], [ 4, 5, 6, 7], [ 8, 9, 10, 11]]]]

‘dims’ is ‘[2]’ (or ‘dims’ is ‘[-2]’)

reverse(t, dims) ==> [[[[8, 9, 10, 11], [4, 5, 6, 7], [0, 1, 2, 3]] [[20, 21, 22, 23], [16, 17, 18, 19], [12, 13, 14, 15]]]] ```

Arguments:

• scope: A Scope object
• tensor: Up to 8-D.
• axis: 1-D. The indices of the dimensions to reverse.

Returns:

• Output: The same shape as tensor .

Reverse block

Source link :https://github.com/EXPNUNI/enuSpaceTensorflow/blob/master/enuSpaceTensorflow/tf_array_ops.cpp

Argument:

• Scope scope : A Scope object (A scope is generated automatically each page. A scope is not connected.)
• Input tensor: Up to 8-D.
• Input axis: 1-D. The indices of the dimensions to reverse.

Output:

• Output output : Output object of Reverse class object.

Result:

• std::vector(Tensor) result_output: The same shape as tensor .

Using Method

※ reverse에서 axis핀은 1-D tensor이고, 몇번째 차원을 뒤집을 것인지 선택하는 역할이다. 따라서 0차원은 scalar값 이므로 0이라는 값은 axis에 들어갈 수 없다.