Specifies the device for ops created/executed in this context.
device_name can be fully specified, as in "/job:worker/task:1/device:cpu:0",
or partially specified, containing only a subset of the "/"-separated
fields. Any fields which are specified override device annotations from outer
scopes. For example:
with tf.device('/job:foo'): # ops created here have devices with /job:foo with tf.device('/job:bar/task:0/device:gpu:2'): # ops created here have the fully specified device above with tf.device('/device:gpu:1'): # ops created here have the device '/job:foo/device:gpu:1'
device_name: The device name to use in the context.
A context manager that specifies the default device to use for newly created ops.
RuntimeError: If a function is passed in.