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jax.lax.dynamic_update_slice

jax.lax.dynamic_update_slice#

jax.lax.dynamic_update_slice(operand, update, start_indices)[source]#

Wraps XLA’s DynamicUpdateSlice operator.

Parameters:

  • operand (Array | np.ndarray) – an array to slice.

  • update (ArrayLike) – an array containing the new values to write onto operand.

  • start_indices (Array | Sequence[ArrayLike]) – a list of scalar indices, one per dimension.

Return type:

Array

Returns:

An array containing the slice.

Examples

Here is an example of updating a one-dimensional slice update:

>>> x = jnp.zeros(6)
>>> y = jnp.ones(3)
>>> dynamic_update_slice(x, y, (2,))
Array([0., 0., 1., 1., 1., 0.], dtype=float32)

If the update slice is too large to fit in the array, the start index will be adjusted to make it fit

>>> dynamic_update_slice(x, y, (3,))
Array([0., 0., 0., 1., 1., 1.], dtype=float32)
>>> dynamic_update_slice(x, y, (5,))
Array([0., 0., 0., 1., 1., 1.], dtype=float32)

Here is an example of a two-dimensional slice update:

>>> x = jnp.zeros((4, 4))
>>> y = jnp.ones((2, 2))
>>> dynamic_update_slice(x, y, (1, 2))
Array([[0., 0., 0., 0.],
       [0., 0., 1., 1.],
       [0., 0., 1., 1.],
       [0., 0., 0., 0.]], dtype=float32)

See also

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