add fuse pass of sequared mat sub fusion

paddle/fluid/framework/ir/CMakeLists.txt

@@ -44,6 +44,7 @@ pass_library(conv_bn_fuse_pass inference)
 pass_library(seqconv_eltadd_relu_fuse_pass inference)
 pass_library(seqpool_concat_fuse_pass inference)
 pass_library(repeated_fc_relu_fuse_pass inference)
+pass_library(squared_mat_sub_fuse_pass inference)
 pass_library(is_test_pass base)
 pass_library(conv_elementwise_add_act_fuse_pass inference)
 pass_library(conv_elementwise_add2_act_fuse_pass inference)

paddle/fluid/framework/ir/squared_mat_sub_fuse_pass.h

@@ -0,0 +1,41 @@
+/* Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License. */
+
+#pragma once
+
+#include <string>
+#include "paddle/fluid/framework/ir/fuse_pass_base.h"
+#include "paddle/fluid/framework/ir/graph.h"
+#include "paddle/fluid/framework/ir/graph_pattern_detector.h"
+
+namespace paddle {
+namespace framework {
+namespace ir {
+
+/**
+ * Fuse ( (A.^2 * B.^2) - (A * B).^2 ) .* scalar
+ */
+class SquaredMatSubFusePass : public FusePassBase {
+ public:
+  virtual ~SquaredMatSubFusePass() {}
+
+ protected:
+  std::unique_ptr<ir::Graph> ApplyImpl(std::unique_ptr<ir::Graph> graph) const;
+
+  const std::string name_scope_{"squared_mat_sub"};
+};
+
+}  // namespace ir
+}  // namespace framework
+}  // namespace paddle

paddle/fluid/inference/api/paddle_pass_builder.h

@@ -99,6 +99,7 @@ class CpuPassStrategy : public PassStrategy {
         "seq_concat_fc_fuse_pass",       //
         "fc_fuse_pass",                  //
         "repeated_fc_relu_fuse_pass",    //
+        "squared_mat_sub_fuse_pass",     //
         "conv_bn_fuse_pass",             //
         "conv_eltwiseadd_bn_fuse_pass",  //
         "is_test_pass",                  //