tf.scatter_nd

Scatters updates into a tensor of shape shape according to indices.

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Compat aliases for migration

See Migration guide for more details.

tf.compat.v1.manip.scatter_nd, tf.compat.v1.scatter_nd

tf.scatter_nd(
    indices, updates, shape, name=None
)

Scatter sparse updates according to individual values at the specified indices. This op returns an output tensor with the shape you specify. This op is the inverse of the tf.gather_nd operator which extracts values or slices from a given tensor.

This operation is similar to tf.tensor_scatter_nd_add, except that the tensor is zero-initialized. Calling tf.scatter_nd(indices, updates, shape) is identical to calling tf.tensor_scatter_nd_add(tf.zeros(shape, updates.dtype), indices, updates)

If indices contains duplicates, the associated updates are accumulated (summed) into the output tensor.

Warning: For floating-point data types, the output may be nondeterministic. This is because the order in which the updates are applied is nondeterministic and when floating-point numbers are added in different orders the resulting numerical approximation error can be slightly different. However, the output will be deterministic if op determinism is enabled via tf.config.experimental.enable_op_determinism.

indices is an integer tensor containing indices into the output tensor. The last dimension of indices can be at most the rank of shape:

indices.shape[-1] <= shape.rank

The last dimension of indices corresponds to indices of elements (if indices.shape[-1] = shape.rank) or slices (if indices.shape[-1] < shape.rank) along dimension indices.shape[-1] of shape.

updates is a tensor with shape:

indices.shape[:-1] + shape[indices.shape[-1]:]

The simplest form of the scatter op is to insert individual elements in a tensor by index. Consider an example where you want to insert 4 scattered elements in a rank-1 tensor with 8 elements.

In Python, this scatter operation would look like this:

    indices = tf.constant([[4], [3], [1], [7]])
    updates = tf.constant([9, 10, 11, 12])
    shape = tf.constant([8])
    scatter = tf.scatter_nd(indices, updates, shape)
    print(scatter)

The resulting tensor would look like this:

[0, 11, 0, 10, 9, 0, 0, 12]

You can also insert entire slices of a higher rank tensor all at once. For example, you can insert two slices in the first dimension of a rank-3 tensor with two matrices of new values.

In Python, this scatter operation would look like this:

    indices = tf.constant([[1], [3]])
    updates = tf.constant([[[5, 5, 5, 5], [6, 6, 6, 6],
                            [7, 7, 7, 7], [8, 8, 8, 8]],
                           [[5, 5, 5, 5], [6, 6, 6, 6],
                            [7, 7, 7, 7], [8, 8, 8, 8]]])
    shape = tf.constant([4, 4, 4])
    scatter = tf.scatter_nd(indices, updates, shape)
    print(scatter)

The resulting tensor would look like this:

[[[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]],
 [[5, 5, 5, 5], [6, 6, 6, 6], [7, 7, 7, 7], [8, 8, 8, 8]],
 [[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]],
 [[5, 5, 5, 5], [6, 6, 6, 6], [7, 7, 7, 7], [8, 8, 8, 8]]]

Note that on CPU, if an out of bound index is found, an error is returned. On GPU, if an out of bound index is found, the index is ignored.

Args
indices	A Tensor. Must be one of the following types: int16, int32, int64. Tensor of indices.
updates	A Tensor. Values to scatter into the output tensor.
shape	A Tensor. Must have the same type as indices. 1-D. The shape of the output tensor.
name	A name for the operation (optional).

Returns
A Tensor. Has the same type as updates.