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jakevdp avatar jakevdp commented on August 25, 2024

You may be able to do what you want via the donate_argnums/donate_argnames parameter of jax.jit; see the jax.jit documentation for a description.

For example:

from functools import partial
import jax
import jax.numpy as jnp

state = (jnp.zeros(4), jnp.arange(4))

@partial(jax.jit, donate_argnums=0)
def f(state):
  x, y = state
  x += 1
  y *= 2
  return (x, y)

pointer0 = state[0].unsafe_buffer_pointer()
pointer1 = state[1].unsafe_buffer_pointer()

state = f(state)

assert state[0].unsafe_buffer_pointer() == pointer0  # same memory
assert state[1].unsafe_buffer_pointer() == pointer1  # same memory

from jax.

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