add parse onnx model api

parser/caffe/caffe_parser.h

@@ -54,6 +54,9 @@ class CaffeModelParser : public domi::ModelParser {
    */
   Status Parse(const char *file, ge::Graph &graph) override;
   Status ParseFromMemory(const char *data, uint32_t size, ge::ComputeGraphPtr &graph) override;
+  virtual Status ParseFromMemory(const char *data, uint32_t size, ge::Graph &graph) {
+	  return domi::SUCCESS;
+  }
 
   /**
    * @ingroup domi_omg

parser/onnx/onnx_parser.h

@@ -39,6 +39,9 @@ class OnnxModelParser : public domi::ModelParser {
   ge::DataType ConvertToGeDataType(const uint32_t type) override;
 
   Status ParseFromMemory(const char *data, uint32_t size, ge::ComputeGraphPtr &graph) override { return domi::SUCCESS; }
+  virtual Status ParseFromMemory(const char *data, uint32_t size, ge::Graph &graph) {
+	  return domi::SUCCESS;
+  }
 
   Status ParseProto(const google::protobuf::Message *proto, ge::ComputeGraphPtr &graph) override {
     return domi::SUCCESS;

parser/tensorflow/tensorflow_parser.h

@@ -91,6 +91,9 @@ class TensorFlowModelParser : public domi::ModelParser {
   Status Parse(const char *file, ge::Graph &graph) override;
 
   Status ParseFromMemory(const char *data, uint32_t size, ge::ComputeGraphPtr &graph) override;
+  virtual Status ParseFromMemory(const char *data, uint32_t size, ge::Graph &graph) {
+	  return domi::SUCCESS;
+  }
 
   /**
    * @ingroup domi_omg