tf.gather_nd
tf.gather_nd
tf.gather_nd
gather_nd( params, indices, name=None )
Defined in tensorflow/python/ops/gen_array_ops.py
.
See the guide: Tensor Transformations > Slicing and Joining
Gather values or slices from params
according to indices
.
indices
is an integer tensor containing indices into params
. The last dimension of indices
can be at most the rank of params
:
indices.shape[-1] <= params.rank
The last dimension of indices
corresponds to elements (if indices.shape[-1] = params.rank
) or slices (if indices.shape[-1] < params.rank
) along dimension indices.shape[-1]
of params
. The output tensor has shape
indices.shape[:-1] + params.shape[indices.shape[-1]:]
Some examples below.
Simple indexing into a matrix:
indices = [[0, 0], [1, 1]] params = [['a', 'b'], ['c', 'd']] output = ['a', 'd']
Slice indexing into a matrix:
indices = [[1], [0]] params = [['a', 'b'], ['c', 'd']] output = [['c', 'd'], ['a', 'b']]
Indexing into a 3-tensor:
indices = [[1]] params = [[['a0', 'b0'], ['c0', 'd0']], [['a1', 'b1'], ['c1', 'd1']]] output = [[['a1', 'b1'], ['c1', 'd1']]] indices = [[0, 1], [1, 0]] params = [[['a0', 'b0'], ['c0', 'd0']], [['a1', 'b1'], ['c1', 'd1']]] output = [['c0', 'd0'], ['a1', 'b1']] indices = [[0, 0, 1], [1, 0, 1]] params = [[['a0', 'b0'], ['c0', 'd0']], [['a1', 'b1'], ['c1', 'd1']]] output = ['b0', 'b1']
Batched indexing into a matrix:
indices = [[[0, 0]], [[0, 1]]] params = [['a', 'b'], ['c', 'd']] output = [['a'], ['b']]
Batched slice indexing into a matrix:
indices = [[[1]], [[0]]] params = [['a', 'b'], ['c', 'd']] output = [[['c', 'd']], [['a', 'b']]]
Batched indexing into a 3-tensor:
indices = [[[1]], [[0]]] params = [[['a0', 'b0'], ['c0', 'd0']], [['a1', 'b1'], ['c1', 'd1']]] output = [[[['a1', 'b1'], ['c1', 'd1']]], [[['a0', 'b0'], ['c0', 'd0']]]] indices = [[[0, 1], [1, 0]], [[0, 0], [1, 1]]] params = [[['a0', 'b0'], ['c0', 'd0']], [['a1', 'b1'], ['c1', 'd1']]] output = [[['c0', 'd0'], ['a1', 'b1']], [['a0', 'b0'], ['c1', 'd1']]] indices = [[[0, 0, 1], [1, 0, 1]], [[0, 1, 1], [1, 1, 0]]] params = [[['a0', 'b0'], ['c0', 'd0']], [['a1', 'b1'], ['c1', 'd1']]] output = [['b0', 'b1'], ['d0', 'c1']]
Args:
-
params
: ATensor
. The tensor from which to gather values. -
indices
: ATensor
. Must be one of the following types:int32
,int64
. Index tensor. -
name
: A name for the operation (optional).
Returns:
A Tensor
. Has the same type as params
. Values from params
gathered from indices given by indices
, with shape indices.shape[:-1] + params.shape[indices.shape[-1]:]
.
© 2017 The TensorFlow Authors. All rights reserved.
Licensed under the Creative Commons Attribution License 3.0.
Code samples licensed under the Apache 2.0 License.
https://www.tensorflow.org/api_docs/python/tf/gather_nd