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MNN/source/backend/cpu/CPUDetectionOutput.cpp

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//
// CPUDetectionOutput.cpp
// MNN
//
// Created by MNN on 2018/07/17.
// Copyright © 2018, Alibaba Group Holding Limited
//
/* When use MSVC compile the file on x86 Release, a compiler internal error will be report because of MSVC's bug.
reference link: https://developercommunity.visualstudio.com/comments/535612/view.html */
#if defined(_MSC_VER) && defined(_M_IX86) && !defined(_DEBUG)
#pragma optimize("", off)
#endif
#include "backend/cpu/CPUDetectionOutput.hpp"
#include <math.h>
#include <list>
#include <MNN/AutoTime.hpp>
#include "backend/cpu/CPUBackend.hpp"
#include "backend/cpu/compute/CommonOptFunction.h"
#include "core/TensorUtils.hpp"
namespace MNN {
CPUDetectionOutput::CPUDetectionOutput(Backend *backend, int classCount, float nmsThreshold, int keepTopK,
float confidenceThreshold, float objectnessScore)
: Execution(backend),
mClassCount(classCount),
mNMSThreshold(nmsThreshold),
mKeepTopK(keepTopK),
mConfidenceThreshold(confidenceThreshold),
mObjectnessScoreThreshold(objectnessScore) {
TensorUtils::getDescribe(&mLocation)->dimensionFormat = MNN_DATA_FORMAT_NCHW;
TensorUtils::getDescribe(&mConfidence)->dimensionFormat = MNN_DATA_FORMAT_NCHW;
TensorUtils::getDescribe(&mPriorbox)->dimensionFormat = MNN_DATA_FORMAT_NCHW;
TensorUtils::getDescribe(&mArmLocation)->dimensionFormat = MNN_DATA_FORMAT_NCHW;
TensorUtils::getDescribe(&mArmConfidence)->dimensionFormat = MNN_DATA_FORMAT_NCHW;
}
using score_box_t = std::tuple<float, float, float, float, int, float>;
#define box_rect(xmin, ymin, xmax, ymax, label, score) std::make_tuple((xmin), (ymin), (xmax), (ymax), (label), (score))
#define box_rect_xmin(rect) (std::get<0>(rect))
#define box_rect_ymin(rect) (std::get<1>(rect))
#define box_rect_xmax(rect) (std::get<2>(rect))
#define box_rect_ymax(rect) (std::get<3>(rect))
#define box_label(rect) (std::get<4>(rect))
#define box_score(rect) (std::get<5>(rect))
static inline float intersectionArea(score_box_t a, score_box_t b) {
float axmin = box_rect_xmin(a), bxmin = box_rect_xmin(b);
float axmax = box_rect_xmax(a), bxmax = box_rect_xmax(b);
float aymin = box_rect_ymin(a), bymin = box_rect_ymin(b);
float aymax = box_rect_ymax(a), bymax = box_rect_ymax(b);
if (axmin > bxmax || axmax < bxmin || aymin > bymax || aymax < bymin)
return 0.f;
float interWidth = fmin(axmax, bxmax) - fmax(axmin, bxmin);
float interHeight = fmin(aymax, bymax) - fmax(aymin, bymin);
return interWidth * interHeight;
}
static void pickBoxes(const std::vector<score_box_t> &boxes, std::list<long> &picked, float nmsThreshold) {
long n = boxes.size();
std::vector<float> areas;
areas.resize(n);
for (int i = 0; i < n; i++) {
auto box = boxes[i];
float width = box_rect_xmax(box) - box_rect_xmin(box);
float height = box_rect_ymax(box) - box_rect_ymin(box);
areas[i] = width * height;
}
for (int i = 0; i < n; i++) {
auto a = boxes[i];
bool keep = true;
for (auto pick : picked) {
auto b = boxes[pick];
// intersection over union
float interArea = intersectionArea(a, b);
float unionArea = areas[i] + areas[pick] - interArea;
if (interArea / unionArea > nmsThreshold) {
keep = false;
break;
}
}
if (keep) {
picked.push_back(i);
}
}
}
ErrorCode CPUDetectionOutput::onResize(const std::vector<Tensor *> &inputs, const std::vector<Tensor *> &outputs) {
auto &location = inputs[0];
auto &priorbox = inputs[2];
if (location->channel() != priorbox->height()) {
MNN_ERROR("Error for CPUDetection output, location and pribox not match\n");
return NOT_SUPPORT;
}
// location transform space
TensorUtils::copyShape(inputs[0], &mLocation, false);
backend()->onAcquireBuffer(&mLocation, Backend::DYNAMIC);
// confidence transform space
TensorUtils::copyShape(inputs[1], &mConfidence, false);
backend()->onAcquireBuffer(&mConfidence, Backend::DYNAMIC);
// priorbox transform space
TensorUtils::copyShape(inputs[2], &mPriorbox, false);
backend()->onAcquireBuffer(&mPriorbox, Backend::DYNAMIC);
// refine
if (inputs.size() >= 5) {
TensorUtils::copyShape(inputs[3], &mArmConfidence, false);
TensorUtils::copyShape(inputs[4], &mArmLocation, false);
backend()->onAcquireBuffer(&mArmConfidence, Backend::DYNAMIC);
backend()->onAcquireBuffer(&mArmLocation, Backend::DYNAMIC);
backend()->onReleaseBuffer(&mArmConfidence, Backend::DYNAMIC);
backend()->onReleaseBuffer(&mArmLocation, Backend::DYNAMIC);
}
// release temp buffer space
backend()->onReleaseBuffer(&mLocation, Backend::DYNAMIC);
backend()->onReleaseBuffer(&mConfidence, Backend::DYNAMIC);
backend()->onReleaseBuffer(&mPriorbox, Backend::DYNAMIC);
return NO_ERROR;
}
ErrorCode CPUDetectionOutput::onExecute(const std::vector<Tensor *> &inputs, const std::vector<Tensor *> &outputs) {
auto &location = inputs[0];
auto &confidence = inputs[1];
auto &priorbox = inputs[2];
auto &output = outputs[0];
// download
MNNUnpackC4(mLocation.host<float>(), location->host<float>(), location->width() * location->height(),
location->channel());
MNNUnpackC4(mConfidence.host<float>(), confidence->host<float>(), confidence->width() * confidence->height(),
confidence->channel());
MNNUnpackC4(mPriorbox.host<float>(), priorbox->host<float>(), priorbox->width() * priorbox->height(),
priorbox->channel());
bool refineDet = inputs.size() >= 5;
if (refineDet) {
Tensor *armconfidence = inputs[3];
Tensor *armlocation = inputs[4];
MNNUnpackC4(mArmConfidence.host<float>(), armconfidence->host<float>(),
armconfidence->width() * armconfidence->height(), armconfidence->channel());
MNNUnpackC4(mArmLocation.host<float>(), armlocation->host<float>(),
armlocation->width() * armlocation->height(), armlocation->channel());
}
auto priorCount = priorbox->height() / 4;
auto locationPtr = mLocation.host<const float>();
auto confidencePtr = mConfidence.host<const float>();
auto priorboxPtr = mPriorbox.host<const float>();
auto variancePtr = mPriorbox.host<const float>() + priorbox->height() * 1;
auto armlocationPtr = refineDet ? mArmLocation.host<const float>() : NULL;
auto armconfidencePtr = refineDet ? mArmConfidence.host<const float>() : NULL;
auto boxes = std::shared_ptr<float>(new float[4 * priorCount], [](float *p) { delete[] p; });
auto decodeBoxs = [&boxes, priorCount, variancePtr](const float *priorboxPtr, const float *locationPtr) {
for (int i = 0; i < priorCount; i++) {
auto loc = locationPtr + i * 4;
auto pb = priorboxPtr + i * 4;
auto var = variancePtr + i * 4;
auto box = boxes.get() + i * 4;
float pbW = pb[2] - pb[0];
float pbH = pb[3] - pb[1];
float pbCX = (pb[0] + pb[2]) * 0.5f;
float pbCY = (pb[1] + pb[3]) * 0.5f;
float boxCX = var[0] * loc[0] * pbW + pbCX;
float boxCY = var[1] * loc[1] * pbH + pbCY;
float boxW = exp(var[2] * loc[2]) * pbW;
float boxH = exp(var[3] * loc[3]) * pbH;
box[0] = boxCX - boxW * 0.5f;
box[1] = boxCY - boxH * 0.5f;
box[2] = boxCX + boxW * 0.5f;
box[3] = boxCY + boxH * 0.5f;
}
};
if (refineDet) {
decodeBoxs(priorboxPtr, armlocationPtr);
decodeBoxs(boxes.get(), locationPtr);
} else {
decodeBoxs(priorboxPtr, locationPtr);
}
// sort and nms for each class
std::vector<score_box_t> allClassBoxes;
auto compareFunction = [](const score_box_t &a, const score_box_t &b) { return box_score(a) > box_score(b); };
for (int i = 1; i < mClassCount; i++) { // start from 1 to ignore background class
std::vector<score_box_t> classBoxes;
// filter by confidenceThreshold
for (int j = 0; j < priorCount; j++) {
float score = confidencePtr[j * mClassCount + i];
if (refineDet && (armconfidencePtr[j * 2 + 1] < mObjectnessScoreThreshold)) {
score = 0.0;
}
if (score > mConfidenceThreshold) {
const float *box = boxes.get() + 4 * j;
classBoxes.push_back(box_rect(box[0], box[1], box[2], box[3], i, score));
}
}
// sort inplace
std::sort(classBoxes.begin(), classBoxes.end(), compareFunction);
// apply nms
std::list<long> picked;
pickBoxes(classBoxes, picked, mNMSThreshold);
// select
for (auto index : picked) {
allClassBoxes.push_back(classBoxes[index]);
}
}
// global sort inplace
std::sort(allClassBoxes.begin(), allClassBoxes.end(), compareFunction);
// set width
int numDetected = (int)allClassBoxes.size();
if (numDetected > mKeepTopK) {
numDetected = mKeepTopK;
}
output->buffer().dim[2].extent = numDetected;
// write data
auto outPtr = output->host<float>();
for (int i = 0; i < numDetected; i++, outPtr += 6 * 4) {
auto box = allClassBoxes[i];
outPtr[0 * 4] = box_label(box);
outPtr[1 * 4] = box_score(box);
outPtr[2 * 4] = box_rect_xmin(box);
outPtr[3 * 4] = box_rect_ymin(box);
outPtr[4 * 4] = box_rect_xmax(box);
outPtr[5 * 4] = box_rect_ymax(box);
}
return NO_ERROR;
}
class CPUDetectionOutputCreator : public CPUBackend::Creator {
public:
virtual Execution *onCreate(const std::vector<Tensor *> &inputs, const std::vector<Tensor *> &outputs,
const MNN::Op *op, Backend *backend) const {
auto d = op->main_as_DetectionOutput();
return new CPUDetectionOutput(backend, d->classCount(), d->nmsThresholdold(), d->keepTopK(),
d->confidenceThreshold(), d->objectnessScore());
}
};
REGISTER_CPU_OP_CREATOR(CPUDetectionOutputCreator, OpType_DetectionOutput);
} // namespace MNN
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