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Merges all summaries collected in the default graph.

key GraphKey used to collect the summaries. Defaults to GraphKeys.SUMMARIES.
scope Optional scope used to filter the summary ops, using re.match

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.

RuntimeError If called with eager execution enabled.

eager compatibility

Not compatible with eager execution. To write TensorBoard summaries under eager execution, use tf.contrib.summary instead.