old_contents: # Copyright 2020 The JAX Authors.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     https://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  """Utilities for running JAX on Cloud TPUs via Colab."""
  
  import requests
  import os
  
  from jax.config import config
  
  TPU_DRIVER_MODE = 0
  
  
  def setup_tpu(tpu_driver_version='tpu_driver_20221103'):
    """Sets up Colab to run on TPU.
  
    Note: make sure the Colab Runtime is set to Accelerator: TPU.
  
    Args
    ----
    tpu_driver_version : (str) specify the version identifier for the tpu driver.
      Set to "tpu_driver_nightly" to use the nightly tpu driver build.
    """
    global TPU_DRIVER_MODE
  
    if not TPU_DRIVER_MODE:
      colab_tpu_addr = os.environ['COLAB_TPU_ADDR'].split(':')[0]
      url = f'http://{colab_tpu_addr}:8475/requestversion/{tpu_driver_version}'
      requests.post(url)
      TPU_DRIVER_MODE = 1
  
    # The following is required to use TPU Driver as JAX's backend.
    config.FLAGS.jax_xla_backend = "tpu_driver"
    config.FLAGS.jax_backend_target = "grpc://" + os.environ['COLAB_TPU_ADDR']
  
new_contents: # Copyright 2020 The JAX Authors.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     https://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  """Utilities for running JAX on Cloud TPUs via Colab."""
  
  import requests
  import os
  
  from jax.config import config
  
  TPU_DRIVER_MODE = 0
  
  
  def setup_tpu(tpu_driver_version='tpu_driver_20221103'):
    """Sets up Colab to run on TPU.
  
    Note: make sure the Colab Runtime is set to Accelerator: TPU.
  
    Args
    ----
    tpu_driver_version : (str) specify the version identifier for the tpu driver.
      Set to "tpu_driver_nightly" to use the nightly tpu driver build.
    """
    global TPU_DRIVER_MODE
  
    if not TPU_DRIVER_MODE:
      colab_tpu_addr = os.environ['COLAB_TPU_ADDR'].split(':')[0]
      url = f'http://{colab_tpu_addr}:8475/requestversion/{tpu_driver_version}'
      requests.post(url)
      TPU_DRIVER_MODE = 1
  
    # The following is required to use TPU Driver as JAX's backend.
    config.FLAGS.jax_xla_backend = "tpu_driver"
    config.FLAGS.jax_backend_target = "grpc://" + os.environ['COLAB_TPU_ADDR']
    # TODO(skyewm): Remove this after SPMD is supported for colab tpu.
    config.update('jax_array', False)
  
subject: Make jax.Array default to False for external colab.