diff --git a/examples/tensorflow/CMakeLists.txt b/examples/tensorflow/CMakeLists.txt new file mode 100644 index 00000000..aaede48f --- /dev/null +++ b/examples/tensorflow/CMakeLists.txt @@ -0,0 +1,7 @@ +set(mains main.c) +set(TARGET_REQUIRED_LIBS tflite) +set(TARGET_REQUIRED_SRCS main_functions.cc output_handler.cc constants.cc model.cc) +generate_bin() + + + diff --git a/examples/tensorflow/constants.cc b/examples/tensorflow/constants.cc new file mode 100644 index 00000000..ac7d6ae8 --- /dev/null +++ b/examples/tensorflow/constants.cc @@ -0,0 +1,20 @@ +// Based on https://github.com/lupyuen/tflite-bl602/blob/main/tensorflow/lite/micro/examples/hello_world/constants.cc +/* Copyright 2019 The TensorFlow 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. +==============================================================================*/ + +#include "constants.h" + +// This is a small number so that it's easy to read the logs +const int kInferencesPerCycle = 20; diff --git a/examples/tensorflow/constants.h b/examples/tensorflow/constants.h new file mode 100644 index 00000000..e77bb0cf --- /dev/null +++ b/examples/tensorflow/constants.h @@ -0,0 +1,33 @@ +// Based on https://github.com/lupyuen/tflite-bl602/blob/main/tensorflow/lite/micro/examples/hello_world/constants.h +/* Copyright 2019 The TensorFlow 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. +==============================================================================*/ + +#ifndef TENSORFLOW_LITE_MICRO_EXAMPLES_HELLO_WORLD_CONSTANTS_H_ +#define TENSORFLOW_LITE_MICRO_EXAMPLES_HELLO_WORLD_CONSTANTS_H_ + +// This constant represents the range of x values our model was trained on, +// which is from 0 to (2 * Pi). We approximate Pi to avoid requiring additional +// libraries. +const float kXrange = 2.f * 3.14159265359f; + +// This constant determines the number of inferences to perform across the range +// of x values defined above. Since each inference takes time, the higher this +// number, the more time it will take to run through the entire range. The value +// of this constant can be tuned so that one full cycle takes a desired amount +// of time. Since different devices take different amounts of time to perform +// inference, this value should be defined per-device. +extern const int kInferencesPerCycle; + +#endif // TENSORFLOW_LITE_MICRO_EXAMPLES_HELLO_WORLD_CONSTANTS_H_ diff --git a/examples/tensorflow/main.c b/examples/tensorflow/main.c new file mode 100644 index 00000000..6f33e44a --- /dev/null +++ b/examples/tensorflow/main.c @@ -0,0 +1,36 @@ +/* Copyright 2019 The TensorFlow 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. +==============================================================================*/ +#include "main_functions.h" +#include "hal_uart.h" + +/// Global Destructor for C++, which we're not using. +/// See https://alex-robenko.gitbook.io/bare_metal_cpp/compiler_output/static#custom-destructors +void *__dso_handle = NULL; + +int main() +{ + bflb_platform_init(0); + setup(); + printf("model load successfully!!\n"); + + while (1) { + loop(); + } + + BL_CASE_SUCCESS; + while (1) { + bflb_platform_delay_ms(100); + } +} diff --git a/examples/tensorflow/main_functions.cc b/examples/tensorflow/main_functions.cc new file mode 100644 index 00000000..56ba088d --- /dev/null +++ b/examples/tensorflow/main_functions.cc @@ -0,0 +1,127 @@ +// Based on https://github.com/lupyuen/tflite-bl602/blob/main/main_functions.cc +/* Copyright 2020 The TensorFlow 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. +==============================================================================*/ + +#include "main_functions.h" +#include "bflb_platform.h" +#include "tensorflow/lite/micro/all_ops_resolver.h" +#include "constants.h" +#include "model.h" +#include "output_handler.h" +#include "tensorflow/lite/micro/micro_error_reporter.h" +#include "tensorflow/lite/micro/micro_interpreter.h" +#include "tensorflow/lite/micro/system_setup.h" +#include "tensorflow/lite/schema/schema_generated.h" + +// Globals, used for compatibility with Arduino-style sketches. +namespace +{ +tflite::ErrorReporter *error_reporter = nullptr; +const tflite::Model *model = nullptr; +tflite::MicroInterpreter *interpreter = nullptr; +TfLiteTensor *input = nullptr; +TfLiteTensor *output = nullptr; +int inference_count = 0; + +constexpr int kTensorArenaSize = 2000; +uint8_t tensor_arena[kTensorArenaSize]; +} // namespace + +// The name of this function is important for Arduino compatibility. +void setup() +{ + tflite::InitializeTarget(); + + // Set up logging. Google style is to avoid globals or statics because of + // lifetime uncertainty, but since this has a trivial destructor it's okay. + // NOLINTNEXTLINE(runtime-global-variables) + static tflite::MicroErrorReporter micro_error_reporter; + error_reporter = µ_error_reporter; + + // Map the model into a usable data structure. This doesn't involve any + // copying or parsing, it's a very lightweight operation. + model = tflite::GetModel(g_model); + if (model->version() != TFLITE_SCHEMA_VERSION) { + TF_LITE_REPORT_ERROR(error_reporter, + "Model provided is schema version %d not equal " + "to supported version %d.", + model->version(), TFLITE_SCHEMA_VERSION); + return; + } + + // This pulls in all the operation implementations we need. + // NOLINTNEXTLINE(runtime-global-variables) + static tflite::AllOpsResolver resolver; + + // Build an interpreter to run the model with. + static tflite::MicroInterpreter static_interpreter( + model, resolver, tensor_arena, kTensorArenaSize, error_reporter); + interpreter = &static_interpreter; + + // Allocate memory from the tensor_arena for the model's tensors. + TfLiteStatus allocate_status = interpreter->AllocateTensors(); + if (allocate_status != kTfLiteOk) { + TF_LITE_REPORT_ERROR(error_reporter, "AllocateTensors() failed"); + return; + } + + // Obtain pointers to the model's input and output tensors. + input = interpreter->input(0); + output = interpreter->output(0); + + // Keep track of how many inferences we have performed. + inference_count = 0; +} + +// The name of this function is important for Arduino compatibility. +void loop() +{ + // Calculate an x value to feed into the model. We compare the current + // inference_count to the number of inferences per cycle to determine + // our position within the range of possible x values the model was + // trained on, and use this to calculate a value. + float position = static_cast(inference_count) / + static_cast(kInferencesPerCycle); + float x = position * kXrange; + + // Quantize the input from floating-point to integer + int8_t x_quantized = x / input->params.scale + input->params.zero_point; + // Place the quantized input in the model's input tensor + input->data.int8[0] = x_quantized; + + // Run inference, and report any error + TfLiteStatus invoke_status = interpreter->Invoke(); + if (invoke_status != kTfLiteOk) { + TF_LITE_REPORT_ERROR(error_reporter, "Invoke failed on x: %f\n", + static_cast(x)); + return; + } + + // Obtain the quantized output from model's output tensor + int8_t y_quantized = output->data.int8[0]; + // Dequantize the output from integer to floating-point + float y = (y_quantized - output->params.zero_point) * output->params.scale; + + // Output the results. A custom HandleOutput function can be implemented + // for each supported hardware target. + printf("x=%f, y=%f\r\n", x, y); //// + //// TODO: HandleOutput(error_reporter, x, y); + + // Increment the inference_counter, and reset it if we have reached + // the total number per cycle + inference_count += 1; + if (inference_count >= kInferencesPerCycle) + inference_count = 0; +} diff --git a/examples/tensorflow/main_functions.h b/examples/tensorflow/main_functions.h new file mode 100644 index 00000000..4a906dd9 --- /dev/null +++ b/examples/tensorflow/main_functions.h @@ -0,0 +1,38 @@ +// Based on https://github.com/lupyuen/tflite-bl602/blob/main/tensorflow/lite/micro/examples/hello_world/main_functions.h +/* Copyright 2019 The TensorFlow 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. +==============================================================================*/ + +#ifndef TENSORFLOW_LITE_MICRO_EXAMPLES_HELLO_WORLD_MAIN_FUNCTIONS_H_ +#define TENSORFLOW_LITE_MICRO_EXAMPLES_HELLO_WORLD_MAIN_FUNCTIONS_H_ + +// Expose a C friendly interface for main functions. +#ifdef __cplusplus +extern "C" { +#endif + +// Initializes all data needed for the example. The name is important, and needs +// to be setup() for Arduino compatibility. +void setup(); + +// Runs one iteration of data gathering and inference. This should be called +// repeatedly from the application code. The name needs to be loop() for Arduino +// compatibility. +void loop(); + +#ifdef __cplusplus +} +#endif + +#endif // TENSORFLOW_LITE_MICRO_EXAMPLES_HELLO_WORLD_MAIN_FUNCTIONS_H_ diff --git a/examples/tensorflow/model.cc b/examples/tensorflow/model.cc new file mode 100644 index 00000000..61596f18 --- /dev/null +++ b/examples/tensorflow/model.cc @@ -0,0 +1,238 @@ +// Based on https://github.com/lupyuen/tflite-bl602/blob/main/tensorflow/lite/micro/examples/hello_world/model.cc +/* Copyright 2020 The TensorFlow 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. +==============================================================================*/ + +// Automatically created from a TensorFlow Lite flatbuffer using the command: +// xxd -i model.tflite > model.cc + +// This is a standard TensorFlow Lite model file that has been converted into a +// C data array, so it can be easily compiled into a binary for devices that +// don't have a file system. + +// See https://github.com/lupyuen/tflite-bl602/blob/main/tensorflow/lite/micro/examples/hello_world/train/README.md for a full description of the creation process. + +#include "model.h" + +// Keep model aligned to 8 bytes to guarantee aligned 64-bit accesses. +alignas(8) const unsigned char g_model[] = { + 0x1c, 0x00, 0x00, 0x00, 0x54, 0x46, 0x4c, 0x33, 0x14, 0x00, 0x20, 0x00, + 0x1c, 0x00, 0x18, 0x00, 0x14, 0x00, 0x10, 0x00, 0x0c, 0x00, 0x00, 0x00, + 0x08, 0x00, 0x04, 0x00, 0x14, 0x00, 0x00, 0x00, 0x1c, 0x00, 0x00, 0x00, + 0x98, 0x00, 0x00, 0x00, 0xc8, 0x00, 0x00, 0x00, 0x1c, 0x03, 0x00, 0x00, + 0x2c, 0x03, 0x00, 0x00, 0x30, 0x09, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, + 0x01, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x60, 0xf7, 0xff, 0xff, + 0x10, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00, + 0x44, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x73, 0x65, 0x72, 0x76, + 0x65, 0x00, 0x00, 0x00, 0x0f, 0x00, 0x00, 0x00, 0x73, 0x65, 0x72, 0x76, + 0x69, 0x6e, 0x67, 0x5f, 0x64, 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0x3a, 0x30, 0x5f, 0x69, 0x6e, 0x74, 0x38, + 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, + 0x01, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, + 0x24, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0xd8, 0xff, 0xff, 0xff, + 0x06, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, + 0x0c, 0x00, 0x0c, 0x00, 0x0b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, + 0x0c, 0x00, 0x00, 0x00, 0x72, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x72, + 0x0c, 0x00, 0x10, 0x00, 0x0f, 0x00, 0x00, 0x00, 0x08, 0x00, 0x04, 0x00, + 0x0c, 0x00, 0x00, 0x00, 0x09, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x09}; +const int g_model_len = 2488; diff --git a/examples/tensorflow/model.h b/examples/tensorflow/model.h new file mode 100644 index 00000000..6d47f6d9 --- /dev/null +++ b/examples/tensorflow/model.h @@ -0,0 +1,32 @@ +// Based on https://github.com/lupyuen/tflite-bl602/blob/main/tensorflow/lite/micro/examples/hello_world/model.h +/* Copyright 2020 The TensorFlow 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. +==============================================================================*/ + +// Automatically created from a TensorFlow Lite flatbuffer using the command: +// xxd -i model.tflite > model.cc + +// This is a standard TensorFlow Lite model file that has been converted into a +// C data array, so it can be easily compiled into a binary for devices that +// don't have a file system. + +// See train/README.md for a full description of the creation process. + +#ifndef TENSORFLOW_LITE_MICRO_EXAMPLES_HELLO_WORLD_MODEL_H_ +#define TENSORFLOW_LITE_MICRO_EXAMPLES_HELLO_WORLD_MODEL_H_ + +extern const unsigned char g_model[]; +extern const int g_model_len; + +#endif // TENSORFLOW_LITE_MICRO_EXAMPLES_HELLO_WORLD_MODEL_H_ diff --git a/examples/tensorflow/output_handler.cc b/examples/tensorflow/output_handler.cc new file mode 100644 index 00000000..28a4c874 --- /dev/null +++ b/examples/tensorflow/output_handler.cc @@ -0,0 +1,25 @@ +// Based on https://github.com/lupyuen/tflite-bl602/blob/main/tensorflow/lite/micro/examples/hello_world/output_handler.cc +/* Copyright 2019 The TensorFlow 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. +==============================================================================*/ + +#include "output_handler.h" + +void HandleOutput(tflite::ErrorReporter* error_reporter, float x_value, + float y_value) { + // Log the current X and Y values + TF_LITE_REPORT_ERROR(error_reporter, "x_value: %f, y_value: %f\n", + static_cast(x_value), + static_cast(y_value)); +} diff --git a/examples/tensorflow/output_handler.h b/examples/tensorflow/output_handler.h new file mode 100644 index 00000000..4e19bea7 --- /dev/null +++ b/examples/tensorflow/output_handler.h @@ -0,0 +1,27 @@ +// Based on https://github.com/lupyuen/tflite-bl602/blob/main/tensorflow/lite/micro/examples/hello_world/output_handler.h +/* Copyright 2019 The TensorFlow 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. +==============================================================================*/ + +#ifndef TENSORFLOW_LITE_MICRO_EXAMPLES_HELLO_WORLD_OUTPUT_HANDLER_H_ +#define TENSORFLOW_LITE_MICRO_EXAMPLES_HELLO_WORLD_OUTPUT_HANDLER_H_ + +#include "tensorflow/lite/c/common.h" +#include "tensorflow/lite/micro/micro_error_reporter.h" + +// Called by the main loop to produce some output based on the x and y values +void HandleOutput(tflite::ErrorReporter *error_reporter, float x_value, + float y_value); + +#endif // TENSORFLOW_LITE_MICRO_EXAMPLES_HELLO_WORLD_OUTPUT_HANDLER_H_ diff --git a/examples/tensorflow/readme.md b/examples/tensorflow/readme.md new file mode 100644 index 00000000..b35397d9 --- /dev/null +++ b/examples/tensorflow/readme.md @@ -0,0 +1,5 @@ +```bash + +$ make APP=tensorflow BOARD=bl706_iot SUPPORT_FLOAT=y SUPPORT_TFLITE=y + +``` \ No newline at end of file