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### `tf.merge_summary(inputs, collections=None, name=None)` {#merge_summary}

Merges summaries.

This op creates a
[`Summary`](https://www.tensorflow.org/code/tensorflow/core/framework/summary.proto)
protocol buffer that contains the union of all the values in the input
summaries.

When the Op is run, it reports an `InvalidArgument` error if multiple values
in the summaries to merge use the same tag.

##### Args:


*  <b>`inputs`</b>: A list of `string` `Tensor` objects containing serialized `Summary`
    protocol buffers.
*  <b>`collections`</b>: Optional list of graph collections keys. The new summary op is
    added to these collections. Defaults to `[GraphKeys.SUMMARIES]`.
*  <b>`name`</b>: A name for the operation (optional).

##### Returns:

  A scalar `Tensor` of type `string`. The serialized `Summary` protocol
  buffer resulting from the merging.