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jax.numpy.arange — JAX documentation

jax.numpy.arange(start, stop=None, step=None, dtype=None, *, device=None)[source]#

Create an array of evenly-spaced values.

JAX implementation of numpy.arange(), implemented in terms of jax.lax.iota().

Similar to Python’s range() function, this can be called with a few different positional signatures:

• jnp.arange(stop): generate values from 0 to stop, stepping by 1.

• jnp.arange(start, stop): generate values from start to stop, stepping by 1.

• jnp.arange(start, stop, step): generate values from start to stop, stepping by step.

Like with Python’s range() function, the starting value is inclusive, and the stop value is exclusive.

Parameters:

• start (ArrayLike | DimSize) – start of the interval, inclusive.

• stop (ArrayLike | DimSize | None | None) – optional end of the interval, exclusive. If not specified, then (start, stop) = (0, start)

• step (ArrayLike | None | None) – optional step size for the interval. Default = 1.

• dtype (DTypeLike | None | None) – optional dtype for the returned array; if not specified it will be determined via type promotion of start, stop, and step.

• device (xc.Device | Sharding | None | None) – (optional) Device or Sharding to which the created array will be committed.

Returns:

Array of evenly-spaced values from start to stop, separated by step.

Return type:

Array

Note

Using arange with a floating-point step argument can lead to unexpected results due to accumulation of floating-point errors, especially with lower-precision data types like float8_* and bfloat16. To avoid precision errors, consider generating a range of integers, and scaling it to the desired range. For example, instead of this:

jnp.arange(-1, 1, 0.01, dtype='bfloat16')

it can be more accurate to generate a sequence of integers, and scale them:

(jnp.arange(-100, 100) * 0.01).astype('bfloat16')

Examples

Single-argument version specifies only the stop value:

>>> jnp.arange(4)
Array([0, 1, 2, 3], dtype=int32)

Passing a floating-point stop value leads to a floating-point result:

>>> jnp.arange(4.0)
Array([0., 1., 2., 3.], dtype=float32)

Two-argument version specifies start and stop, with step=1:

>>> jnp.arange(1, 6)
Array([1, 2, 3, 4, 5], dtype=int32)

Three-argument version specifies start, stop, and step:

>>> jnp.arange(0, 2, 0.5)
Array([0. , 0.5, 1. , 1.5], dtype=float32)

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