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Create placeholder name for the graph editor.

t optional tensor on which the placeholder operation's name will be based on
scope absolute scope with which to prefix the placeholder's name. None means that the scope of t is preserved. "" means the root scope.
prefix placeholder name prefix.

A new placeholder name prefixed by "geph". Note that "geph" stands for Graph Editor PlaceHolder. This convention allows to quickly identify the placeholder generated by the Graph Editor.

TypeError if t is not None or a tf.Tensor.