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Creates a summary file writer for the given log directory.

logdir a string specifying the directory in which to write an event file.
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 a name for the op that creates the writer.

A SummaryWriter object.