code: def index_weights(weights, idx):
      cpu_device = jax.devices("cpu")[0]
      return jax.device_put(
          jax.tree_map(lambda i: i[idx], weights), cpu_device
      )
  
imports: import functools
  import io
  import json
  import time
  import jax
  import jax.numpy
  import numpy
  import multiprocessing
  import ray
  from smart_open import open
  from mesh_transformer.util import head_print
label_desc: Use image node_id 2 for calling a global function with example usage: index_weights(weights, idx) and returns: jax