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https://github.com/vee1e/tflite-micro.git
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d59136a619
Add a decompression library, defining structures for compressed tensors and decompression logic to be used by kernels. Add a unit test to validate decompression logic. BUG=part of #2636
68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
/* Copyright 2024 The TensorFlow Authors. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==============================================================================*/
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#ifndef TENSORFLOW_LITE_MICRO_MICRO_COMPRESSION_H_
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#define TENSORFLOW_LITE_MICRO_MICRO_COMPRESSION_H_
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#ifdef USE_TFLM_COMPRESSION
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#include "tensorflow/lite/c/common.h"
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namespace tflite {
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//
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// Compressed tensors
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//
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static constexpr const char* kCompressionMetadataString =
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"COMPRESSION_METADATA";
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enum class CompressionScheme : uint8_t {
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kBinQuant,
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};
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struct LookupTableData {
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static constexpr size_t kMaxBitWidth = 7;
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static constexpr size_t kMaxValueTableChannelStride = 128;
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const void* value_table; // Pointer into FlatBuffer Values.
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uint8_t value_table_channel_stride; // elements per channel
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uint8_t compressed_bit_width : 3; // 1 to 7 bits
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bool is_per_channel_quantized : 1; // tensor is per-channel quantized
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bool use_alternate_axis : 1; // shape default channel:
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// 0 = first, 1 = last
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uint8_t reserved : 3;
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};
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union CompressionData {
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LookupTableData* lut_data;
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};
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struct CompressionTensorData {
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CompressionScheme scheme;
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CompressionData data;
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};
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struct CompressedTensorList {
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// Sparsely populated array with the same number of elements as there are
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// tensors in the Subgraph. An alternative would include a tensor index in
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// the struct for each and walk the list on look up. This could be slow.
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const CompressionTensorData** tensors;
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};
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} // namespace tflite
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#endif // USE_TFLM_COMPRESSION
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#endif // TENSORFLOW_LITE_MICRO_MICRO_COMPRESSION_H_
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