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jax.numpy.split — JAX documentation

jax.numpy.split(ary, indices_or_sections, axis=0)[source]#

Split an array into sub-arrays.

JAX implementation of numpy.split().

Parameters:

• ary (ArrayLike) – N-dimensional array-like object to split

• indices_or_sections (int | Sequence[int] | ArrayLike) –

  either a single integer or a sequence of indices.

  • if indices_or_sections is an integer N, then N must evenly divide ary.shape[axis] and ary will be divided into N equally-sized chunks along axis.

  • if indices_or_sections is a sequence of integers, then these integers specify the boundary between unevenly-sized chunks along axis; see examples below.

• axis (int) – the axis along which to split; defaults to 0.

Returns:

A list of arrays. If indices_or_sections is an integer N, then the list is of length N. If indices_or_sections is a sequence seq, then the list is is of length len(seq) + 1.

Return type:

list[Array]

Examples

Splitting a 1-dimensional array:

>>> x = jnp.array([1, 2, 3, 4, 5, 6, 7, 8, 9])

Split into three equal sections:

>>> chunks = jnp.split(x, 3)
>>> print(*chunks)
[1 2 3] [4 5 6] [7 8 9]

Split into sections by index:

>>> chunks = jnp.split(x, [2, 7])  # [x[0:2], x[2:7], x[7:]]
>>> print(*chunks)
[1 2] [3 4 5 6 7] [8 9]

Splitting a two-dimensional array along axis 1:

>>> x = jnp.array([[1, 2, 3, 4],
...                [5, 6, 7, 8]])
>>> x1, x2 = jnp.split(x, 2, axis=1)
>>> print(x1)
[[1 2]
 [5 6]]
>>> print(x2)
[[3 4]
 [7 8]]

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