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### `tf.train.add_queue_runner(qr, collection='queue_runners')` {#add_queue_runner}
Adds a `QueueRunner` to a collection in the graph.
When building a complex model that uses many queues it is often difficult to
gather all the queue runners that need to be run. This convenience function
allows you to add a queue runner to a well known collection in the graph.
The companion method `start_queue_runners()` can be used to start threads for
all the collected queue runners.
##### Args:
* <b>`qr`</b>: A `QueueRunner`.
* <b>`collection`</b>: A `GraphKey` specifying the graph collection to add
the queue runner to. Defaults to `GraphKeys.QUEUE_RUNNERS`.
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