1 /* Copyright 2019 The TensorFlow Authors. All Rights Reserved.
2 
3 Licensed under the Apache License, Version 2.0 (the "License");
4 you may not use this file except in compliance with the License.
5 You may obtain a copy of the License at
6 
7     http://www.apache.org/licenses/LICENSE-2.0
8 
9 Unless required by applicable law or agreed to in writing, software
10 distributed under the License is distributed on an "AS IS" BASIS,
11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 See the License for the specific language governing permissions and
13 limitations under the License.
14 ==============================================================================*/
15 
16 #ifndef TENSORFLOW_LITE_DELEGATES_GPU_GL_COMPILER_FUSE_AUTO_INPUT_H_
17 #define TENSORFLOW_LITE_DELEGATES_GPU_GL_COMPILER_FUSE_AUTO_INPUT_H_
18 
19 #include "tensorflow/lite/delegates/gpu/common/model.h"
20 #include "tensorflow/lite/delegates/gpu/common/model_transformer.h"
21 
22 namespace tflite {
23 namespace gpu {
24 namespace gl {
25 
26 // Fuses nodes that have auto output with auto input node using the following
27 // rules.
28 //
29 // Source graph:
30 //   A B C
31 //   \ | /
32 //     D
33 //
34 // - A, B and C each have a single output marked as AUTO
35 // - Each output is used only by D
36 // - D has all inputs marked as AUTO
37 //
38 // Result: in the best case a single node that does (A,B,C)+D operations.
39 //
40 class FuseAutoInput : public NodeTransformation {
41  public:
42   TransformResult ApplyToNode(Node* node, GraphFloat32* graph) final;
43 };
44 
45 }  // namespace gl
46 }  // namespace gpu
47 }  // namespace tflite
48 
49 #endif  // TENSORFLOW_LITE_DELEGATES_GPU_GL_COMPILER_FUSE_AUTO_INPUT_H_
50