jax.lax.select

jax.lax.select(pred, on_true, on_false)

Selects between two branches based on a boolean predicate.

Wraps XLA’s Select operator.

In general select() leads to evaluation of both branches, although the compiler may elide computations if possible. For a similar function that usually evaluates only a single branch, see cond().

Parameters

• pred (Union[Array, ndarray, bool_, number, bool, int, float, complex]) – boolean array

• on_true (Union[Array, ndarray, bool_, number, bool, int, float, complex]) – array containing entries to return where pred is True. Must have the same shape as pred, and the same shape and dtype as on_false.

• on_false (Union[Array, ndarray, bool_, number, bool, int, float, complex]) – array containing entries to return where pred is False. Must have the same shape as pred, and the same shape and dtype as on_true.

Returns

array with same shape and dtype as on_true and on_false.

Return type

result