tf.IndexedSlices

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A sparse representation of a set of tensor slices at given indices.

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Compat aliases for migration

See Migration guide for more details.

tf.compat.v1.IndexedSlices

tf.IndexedSlices(
    values, indices, dense_shape=None
)

This class is a simple wrapper for a pair of Tensor objects:

• values: A Tensor of any dtype with shape [D0, D1, ..., Dn].
• indices: A 1-D integer Tensor with shape [D0].

An IndexedSlices is typically used to represent a subset of a larger tensor dense of shape [LARGE0, D1, .. , DN] where LARGE0 >> D0. The values in indices are the indices in the first dimension of the slices that have been extracted from the larger tensor.

The dense tensor dense represented by an IndexedSlices slices has

dense[slices.indices[i], :, :, :, ...] = slices.values[i, :, :, :, ...]

The IndexedSlices class is used principally in the definition of gradients for operations that have sparse gradients (e.g. tf.gather).

v = tf.Variable([[0.,1, 2], [2, 3, 4], [4, 5, 6], [6, 7, 8]])
with tf.GradientTape() as tape:
  r = tf.gather(v, [1,3])
index_slices = tape.gradient(r,v)
index_slices
<...IndexedSlices object ...>
index_slices.indices.numpy()
array([1, 3], dtype=int32)
index_slices.values.numpy()
array([[1., 1., 1.],
       [1., 1., 1.]], dtype=float32)

Contrast this representation with tf.sparse.SparseTensor, which uses multi-dimensional indices and scalar values.

Attributes
dense_shape	A 1-D Tensor containing the shape of the corresponding dense tensor.
device	The name of the device on which values will be produced, or None.
dtype	The DType of elements in this tensor.
graph	The Graph that contains the values, indices, and shape tensors.
indices	A 1-D Tensor containing the indices of the slices.
name	The name of this IndexedSlices.
op	The Operation that produces values as an output.
shape	Gets the tf.TensorShape representing the shape of the dense tensor.
values	A Tensor containing the values of the slices.

Methods

consumers

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consumers()

__neg__

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__neg__()