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Creates a summary file writer in the current context under the given name.

logdir a string, or None. If a string, creates a summary file writer which writes to the directory named by the string. If None, returns a mock object which acts like a summary writer but does nothing, useful to use as a context manager.
max_queue the largest number of summaries to keep in a queue; will flush once the queue gets bigger than this. Defaults to 10.
flush_millis the largest interval between flushes. Defaults to 120,000.
filename_suffix optional suffix for the event file name. Defaults to .v2.
name Shared name for this SummaryWriter resource stored to default Graph. Defaults to the provided logdir prefixed with logdir:. Note: if a summary writer resource with this shared name already exists, the returned SummaryWriter wraps that resource and the other arguments have no effect.

Either a summary writer or an empty object which can be used as a summary writer.