xref: /aosp_15_r20/external/tensorflow/tensorflow/lite/delegates/gpu/gl/kernels/quantize_and_dequantize.h (revision b6fb3261f9314811a0f4371741dbb8839866f948)
1 /* Copyright 2020 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_KERNELS_QUANTIZE_AND_DEQUANTIZE_H_
17 #define TENSORFLOW_LITE_DELEGATES_GPU_GL_KERNELS_QUANTIZE_AND_DEQUANTIZE_H_
18 
19 #include <memory>
20 
21 #include "tensorflow/lite/delegates/gpu/common/operations.h"
22 #include "tensorflow/lite/delegates/gpu/gl/node_shader.h"
23 
24 namespace tflite {
25 namespace gpu {
26 namespace gl {
27 
28 // Performs the operation: {Quantize, Dequantize} on floating-point data.
29 // We need this operation to emulate the error introduced by quantization
30 // on the GPU, which cannot represent int8 tensors.
31 //
32 // Implemented as:
33 // qvalue = round((min(qmax, max(qmin, src_val)) - qmin) * (1/qscale))
34 // dq_value = qvalue * qscale + qmin
35 // Here, qmin, qmax & qscale refer to the quantization values as implemented in
36 // TensorFlow Lite's 'FakeQuant' kernel.
37 //
38 // NOTE: We do not need to nudge min/max values in this op, since they would
39 // already be adjusted while generating the quantized model.
40 std::unique_ptr<NodeShader> NewQuantizeAndDequantizeNodeShader();
41 
42 }  // namespace gl
43 }  // namespace gpu
44 }  // namespace tflite
45 
46 #endif  // TENSORFLOW_LITE_DELEGATES_GPU_GL_KERNELS_QUANTIZE_AND_DEQUANTIZE_H_
47