tf.train.ProfilerHook

Class ProfilerHook

Inherits From: SessionRunHook

Defined in tensorflow/python/training/basic_session_run_hooks.py.

Captures CPU/GPU profiling information every N steps or seconds.

This produces files called "timeline-.json", which are in Chrome Trace format.

For more information see: https://github.com/catapult-project/catapult/blob/master/tracing/README.md

__init__

__init__(
    save_steps=None,
    save_secs=None,
    output_dir='',
    show_dataflow=True,
    show_memory=False
)

Initializes a hook that takes periodic profiling snapshots.

options.run_metadata argument of tf.Session.Run is used to collect metadata about execution. This hook sets the metadata and dumps it in Chrome Trace format.

Args:

• save_steps: int, save profile traces every N steps. Exactly one of save_secs and save_steps should be set.
• save_secs: int or float, save profile traces every N seconds.
• output_dir: string, the directory to save the profile traces to. Defaults to the current directory.
• show_dataflow: bool, if True, add flow events to the trace connecting producers and consumers of tensors.
• show_memory: bool, if True, add object snapshot events to the trace showing the sizes and lifetimes of tensors.

Methods

after_create_session

after_create_session(
    session,
    coord
)

Called when new TensorFlow session is created.

This is called to signal the hooks that a new session has been created. This has two essential differences with the situation in which begin is called:

• When this is called, the graph is finalized and ops can no longer be added to the graph.
• This method will also be called as a result of recovering a wrapped session, not only at the beginning of the overall session.

Args:

• session: A TensorFlow Session that has been created.
• coord: A Coordinator object which keeps track of all threads.

after_run

after_run(
    run_context,
    run_values
)

before_run

before_run(run_context)

begin

begin()

end

end(session)

Called at the end of session.

The session argument can be used in case the hook wants to run final ops, such as saving a last checkpoint.

If session.run() raises exception other than OutOfRangeError or StopIteration then end() is not called. Note the difference between end() and after_run() behavior when session.run() raises OutOfRangeError or StopIteration. In that case end() is called but after_run() is not called.

Args:

• session: A TensorFlow Session that will be soon closed.