Creates executors given a graph definition "gdef" of a "session". If a node in "gdef" is shared by other graphs in "session", the same op kernel is reused. E.g., typically a params node is shared by multiple graphs in a session. If "gdef" is assigned to multiple devices, extra nodes (e.g., send/recv nodes) maybe added. The extra nodes' name are generated by calling "new_name(old_name)". "executo
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