message: replace new mish impl with softplus
diff: @@ -531,35 +531,32 @@ public:
  }
  };
  -class MishSubgraph2 : public Subgraph
  +// softplus(x) = log(exp(x) + 1)
  +class SoftplusSubgraph: public Subgraph
  {
  public:
  - MishSubgraph2()
  + SoftplusSubgraph()
  {
  int input = addNodeToMatch("");
  int exp = addNodeToMatch("Exp", input);
  int addVal = addNodeToMatch("");
  int add = addNodeToMatch("Add", addVal, exp);
  - int log = addNodeToMatch("Log", add);
  - int tanh = addNodeToMatch("Tanh", log);
  - addNodeToMatch("Mul", input, tanh);
  - setFusedNode("Mish", input);
  + addNodeToMatch("Log", add);
  + setFusedNode("Softplus", input);
  }
  };
  -class MishSubgraph3 : public Subgraph
  +class SoftplusSubgraph2: public Subgraph
  {
  public:
  - MishSubgraph3()
  + SoftplusSubgraph2()
  {
  int input = addNodeToMatch("");
  int exp = addNodeToMatch("Exp", input);
  int addVal = addNodeToMatch("");
  int add = addNodeToMatch("Add", exp, addVal);
  - int log = addNodeToMatch("Log", add);
  - int tanh = addNodeToMatch("Tanh", log);
  - addNodeToMatch("Mul", input, tanh);
  - setFusedNode("Mish", input);
  + addNodeToMatch("Log", add);
  + setFusedNode("Softplus", input);
  }
  };
  @@ -766,9 +763,9 @@ void simplifySubgraphs(opencv_onnx::GraphProto& net)
  subgraphs.push_back(makePtr<BatchNormalizationSubgraph1>());
  subgraphs.push_back(makePtr<BatchNormalizationSubgraph2>());
  subgraphs.push_back(makePtr<ExpandSubgraph>());
  + subgraphs.push_back(makePtr<SoftplusSubgraph>());
  + subgraphs.push_back(makePtr<SoftplusSubgraph2>());
  subgraphs.push_back(makePtr<MishSubgraph>());
  - subgraphs.push_back(makePtr<MishSubgraph2>());
  - subgraphs.push_back(makePtr<MishSubgraph3>());
  subgraphs.push_back(makePtr<NormalizeSubgraph4>());
  subgraphs.push_back(makePtr<NormalizeSubgraph5>());
  