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Create a tf.compat.v1.placeholder for the Graph Editor.

Note that the correct graph scope must be set by the calling function.

t a tf.Tensor whose name will be used to create the placeholder (see function placeholder_name).
scope absolute scope within which to create the placeholder. None means that the scope of t is preserved. "" means the root scope.
prefix placeholder name prefix.

A newly created tf.compat.v1.placeholder.

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