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Initializes summary writing for graph execution mode.

This operation is a no-op when executing eagerly.

This helper method provides a higher-level alternative to using tf.contrib.summary.summary_writer_initializer_op and tf.contrib.summary.graph.

Most users will also want to call tf.compat.v1.train.create_global_step which can happen before or after this function is called.

graph A tf.Graph or tf.compat.v1.GraphDef to output to the writer. This function will not write the default graph by default. When writing to an event log file, the associated step will be zero.
session So this method can call This defaults to tf.compat.v1.get_default_session.

RuntimeError If the current thread has no default tf.contrib.summary.SummaryWriter.
ValueError If session wasn't passed and no default session.