Set of string tags to identify the required MetaGraphDef. These should
correspond to the tags used when saving the variables using the
SavedModel save() API.
Directory in which the SavedModel protocol buffer and variables
to be loaded are located.
Optional string -- if specified, prepend this string
followed by '/' to all loaded tensor names. This scope is applied to
tensor instances loaded into the passed session, but it is not written
through to the static MetaGraphDef protocol buffer that is returned.
Optional keyword arguments passed through to Saver.
The MetaGraphDef protocol buffer loaded in the provided session. This
can be used to further extract signature-defs, collection-defs, etc.
MetaGraphDef associated with the tags cannot be found.