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Writes a summary using raw tf.compat.v1.Summary protocol buffers.

Experimental: this exists to support the usage of V1-style manual summary writing (via the construction of a tf.compat.v1.Summary protocol buffer) with the V2 summary writing API.

tensor the string Tensor holding one or more serialized Summary protobufs
step Explicit int64-castable monotonic step value for this summary. If omitted, this defaults to tf.summary.experimental.get_step(), which must not be None.
name Optional string name for this op.

True on success, or false if no summary was written because no default summary writer was available.

ValueError if a default writer exists, but no step was provided and tf.summary.experimental.get_step() is None.