[fix] embedding variable is_initialized not executed in graph mode #130
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In graph mode, report_uninitialized_variables use state_ops.is_variable_initialized to compose is_initialized_op, for ResourceVariable, this method will call BsaeResourceVariable.is_initialized method to insert this op into graph.
EmbeddingVariable should override this method so that ev_is_initailed_op can be composed into report_uninitialized_variables.