90 lines
3.3 KiB
C++
90 lines
3.3 KiB
C++
/* Copyright 2021 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 TFLITE_MICRO_TENSORFLOW_LITE_MICRO_MICRO_RESOURCE_H_
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#define TFLITE_MICRO_TENSORFLOW_LITE_MICRO_MICRO_RESOURCE_H_
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#include <cstdint>
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#include "tensorflow/lite/c/common.h"
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#include "tensorflow/lite/micro/micro_allocator.h"
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namespace tflite {
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class MicroResourceVariables {
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public:
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// Create
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static MicroResourceVariables* Create(MicroAllocator* allocator,
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int num_variables);
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// Creates a resource variable if none is available for the given container
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// and shared name pair. Returns the resource ID corresponding to the
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// container and shared name pair. If allocation fails, the returned resource
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// ID will be negative. The the container and shared_name must outlive this
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// class.
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int CreateIdIfNoneFound(const char* container, const char* shared_name);
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// Read the resource buffer associated with the given ID into the given
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// tensor.
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TfLiteStatus Read(int id, const TfLiteEvalTensor* tensor);
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// Allocates the resource buffer if none has been allocated, based on the
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// length of the input tensor. Copies input tensor contents to the resource
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// buffer.
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TfLiteStatus Allocate(int id, TfLiteContext* context,
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const TfLiteTensor* tensor);
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// Copies input tensor contents to the resource buffer.
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// AllocateResourceVariable with a TFLite tensor must have been called first
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// in order to allocate the resource buffer.
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TfLiteStatus Assign(int id, const TfLiteEvalTensor* tensor);
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// Zeros out all resource buffers.
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TfLiteStatus ResetAll();
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private:
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int FindId(const char* container, const char* shared_name);
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// Micro resource contains the mapping between resource container/name strings
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// and resouce IDs. Each resource ID corresponds to a resource buffer pointer.
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// The resouce ID is created during the VAR_HANDLE operator preparation stage.
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// The resource buffer pointer is created during ASSIGN_VARIABLE preparation
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// stage based on the size of the TFLiteTensor being assigned.
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struct MicroResourceVariable {
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const char* container;
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const char* shared_name;
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void* resource_buffer;
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// This is only for verifying read size.
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size_t bytes;
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// Initialization default value
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int8_t default_value;
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};
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MicroResourceVariables(MicroResourceVariable* variables,
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int max_variable_count)
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: resource_variables_(variables),
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max_variable_count_(max_variable_count),
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num_resource_variables_(0) {}
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MicroResourceVariable* resource_variables_;
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int max_variable_count_;
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int num_resource_variables_;
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};
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} // namespace tflite
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#endif // TFLITE_MICRO_TENSORFLOW_LITE_MICRO_MICRO_RESOURCE_H_
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