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Adds ops to list the names of uninitialized variables.

When run, it returns a 1-D tensor containing the names of uninitialized variables if there are any, or an empty array if there are none.

var_list List of Variable objects to check. Defaults to the value of global_variables() + local_variables()
name Optional name of the Operation.

A 1-D tensor containing names of the uninitialized variables, or an empty 1-D tensor if there are no variables or no uninitialized variables.