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### `tf.merge_all_summaries(*args, **kwargs)` {#merge_all_summaries}

Merges all summaries collected in the default graph. (deprecated)

THIS FUNCTION IS DEPRECATED. It will be removed after 2016-11-30.
Instructions for updating:
Please switch to tf.summary.merge_all.

  Args:
    key: `GraphKey` used to collect the summaries.  Defaults to
      `GraphKeys.SUMMARIES`.

  Returns:
    If no summaries were collected, returns None.  Otherwise returns a scalar
    `Tensor` of type `string` containing the serialized `Summary` protocol
    buffer resulting from the merging.