class_docstr: Tests jit targeting to different backends.
class_docstr_tok: ["Tests","jit","targeting","to","different","backends","."]
code: def test_jit_on_nondefault_backend(self):
      cpus = jax.devices("cpu")
      self.assertNotEmpty(cpus)
  
      # Since we are not on CPU, some other backend will be the default
      default_dev = jax.devices()[0]
      self.assertNotEqual(default_dev.platform, "cpu")
  
      data_on_cpu = jax.device_put(1, device=cpus[0])
      self.assertEqual(data_on_cpu.devices(), {cpus[0]})
  
      def my_sin(x):
          return jnp.sin(x)
  
      # jit without any device spec follows the data
      result1 = jax.jit(my_sin)(2)
      self.assertEqual(result1.devices(), {default_dev})
      result2 = jax.jit(my_sin)(data_on_cpu)
      self.assertEqual(result2.devices(), {cpus[0]})
  
      # jit with `device` spec places the data on the specified device
      result3 = jax.jit(my_sin, device=cpus[0])(2)
      self.assertEqual(result3.devices(), {cpus[0]})
  
      # jit with `backend` spec places the data on the specified backend
      result4 = jax.jit(my_sin, backend="cpu")(2)
      self.assertEqual(result4.devices(), {cpus[0]})
  
file_path: jax/tests/multibackend_test.py
imports: from functools import partial
  from absl.testing import absltest
  import numpy
  import numpy.random
  from unittest import SkipTest
  import jax
  from jax._src import test_util
  from jax import numpy
  from jax import config
label_desc: Use image node_id 7 for calling the MultiBackendTest obj's underlying member method code with example usage: obj.test_jit_on_nondefault_backend() and returns: jnp