message: Update the ADC file location in Colab.
diff: @@ -19,6 +19,7 @@ from __future__ import division
  from __future__ import print_function
  import json
  +import os
  from tensorflow.contrib.cloud.python.ops import gen_gcs_config_ops
  from tensorflow.python.framework import dtypes
  @@ -188,6 +189,8 @@ def configure_colab_session(session):
  session: A `tf.Session` session.
  """
  # Read from the application default credentials (adc).
  - with open('/content/datalab/adc.json') as f:
  + adc_filename = os.environ.get(
  + 'GOOGLE_APPLICATION_CREDENTIALS', '/content/adc.json')
  + with open(adc_filename) as f:
  data = json.load(f)
  configure_gcs(session, credentials=data)
  