# Running Graphs
[TOC]

This library contains classes for launching graphs and executing operations.

[This guide](../../guide/low_level_intro.md) has examples of how a graph
is launched in a `tf.Session`.

## Session management

*   `tf.Session`
*   `tf.InteractiveSession`
*   `tf.get_default_session`

## Error classes and convenience functions

*   `tf.OpError`
*   `tf.errors.CancelledError`
*   `tf.errors.UnknownError`
*   `tf.errors.InvalidArgumentError`
*   `tf.errors.DeadlineExceededError`
*   `tf.errors.NotFoundError`
*   `tf.errors.AlreadyExistsError`
*   `tf.errors.PermissionDeniedError`
*   `tf.errors.UnauthenticatedError`
*   `tf.errors.ResourceExhaustedError`
*   `tf.errors.FailedPreconditionError`
*   `tf.errors.AbortedError`
*   `tf.errors.OutOfRangeError`
*   `tf.errors.UnimplementedError`
*   `tf.errors.InternalError`
*   `tf.errors.UnavailableError`
*   `tf.errors.DataLossError`
*   `tf.errors.exception_type_from_error_code`
*   `tf.errors.error_code_from_exception_type`
*   `tf.errors.raise_exception_on_not_ok_status`