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tf_approxmatch.cpp
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#include "tensorflow/core/framework/op.h"
#include "tensorflow/core/framework/op_kernel.h"
#include <algorithm>
#include <vector>
#include <math.h>
using namespace tensorflow;
REGISTER_OP("ApproxMatch")
.Input("xyz1: float32")
.Input("xyz2: float32")
.Output("match: float32");
REGISTER_OP("MatchCost")
.Input("xyz1: float32")
.Input("xyz2: float32")
.Input("match: float32")
.Output("cost: float32");
REGISTER_OP("MatchCostGrad")
.Input("xyz1: float32")
.Input("xyz2: float32")
.Input("match: float32")
.Output("grad1: float32")
.Output("grad2: float32");
void approxmatch_cpu(int b,int n,int m,const float * xyz1,const float * xyz2,float * match){
for (int i=0;i<b;i++){
int factorl=std::max(n,m)/n;
int factorr=std::max(n,m)/m;
std::vector<double> saturatedl(n,double(factorl)),saturatedr(m,double(factorr));
std::vector<double> weight(n*m);
for (int j=0;j<n*m;j++)
match[j]=0;
for (int j=8;j>=-2;j--){
//printf("i=%d j=%d\n",i,j);
double level=-powf(4.0,j);
if (j==-2)
level=0;
for (int k=0;k<n;k++){
double x1=xyz1[k*3+0];
double y1=xyz1[k*3+1];
double z1=xyz1[k*3+2];
for (int l=0;l<m;l++){
double x2=xyz2[l*3+0];
double y2=xyz2[l*3+1];
double z2=xyz2[l*3+2];
weight[k*m+l]=expf(level*((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)+(z1-z2)*(z1-z2)))*saturatedr[l];
}
}
std::vector<double> ss(m,1e-9);
for (int k=0;k<n;k++){
double s=1e-9;
for (int l=0;l<m;l++){
s+=weight[k*m+l];
}
for (int l=0;l<m;l++){
weight[k*m+l]=weight[k*m+l]/s*saturatedl[k];
}
for (int l=0;l<m;l++)
ss[l]+=weight[k*m+l];
}
for (int l=0;l<m;l++){
double s=ss[l];
double r=std::min(saturatedr[l]/s,1.0);
ss[l]=r;
}
std::vector<double> ss2(m,0);
for (int k=0;k<n;k++){
double s=0;
for (int l=0;l<m;l++){
weight[k*m+l]*=ss[l];
s+=weight[k*m+l];
ss2[l]+=weight[k*m+l];
}
saturatedl[k]=std::max(saturatedl[k]-s,0.0);
}
for (int k=0;k<n*m;k++)
match[k]+=weight[k];
for (int l=0;l<m;l++){
saturatedr[l]=std::max(saturatedr[l]-ss2[l],0.0);
}
}
xyz1+=n*3;
xyz2+=m*3;
match+=n*m;
}
}
void matchcost_cpu(int b,int n,int m,const float * xyz1,const float * xyz2,const float * match,float * cost){
for (int i=0;i<b;i++){
double s=0;
for (int j=0;j<n;j++)
for (int k=0;k<m;k++){
float x1=xyz1[j*3+0];
float y1=xyz1[j*3+1];
float z1=xyz1[j*3+2];
float x2=xyz2[k*3+0];
float y2=xyz2[k*3+1];
float z2=xyz2[k*3+2];
float d=sqrtf((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1)+(z2-z1)*(z2-z1))*match[j*m+k];
s+=d;
}
cost[0]=s;
xyz1+=n*3;
xyz2+=m*3;
match+=n*m;
cost+=1;
}
}
void matchcostgrad_cpu(int b,int n,int m,const float * xyz1,const float * xyz2,const float * match,float * grad1,float * grad2){
for (int i=0;i<b;i++){
for (int j=0;j<n;j++)
grad1[j*3+0]=0;
for (int j=0;j<m;j++){
float sx=0,sy=0,sz=0;
for (int k=0;k<n;k++){
float x2=xyz2[j*3+0];
float y2=xyz2[j*3+1];
float z2=xyz2[j*3+2];
float x1=xyz1[k*3+0];
float y1=xyz1[k*3+1];
float z1=xyz1[k*3+2];
float d=std::max(sqrtf((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1)+(z2-z1)*(z2-z1)),1e-20f);
float dx=match[k*m+j]*((x2-x1)/d);
float dy=match[k*m+j]*((y2-y1)/d);
float dz=match[k*m+j]*((z2-z1)/d);
grad1[k*3+0]-=dx;
grad1[k*3+1]-=dy;
grad1[k*3+2]-=dz;
sx+=dx;
sy+=dy;
sz+=dz;
}
grad2[j*3+0]=sx;
grad2[j*3+1]=sy;
grad2[j*3+2]=sz;
}
xyz1+=n*3;
xyz2+=m*3;
match+=n*m;
grad1+=n*3;
grad2+=m*3;
}
}
void approxmatchLauncher(int b,int n,int m,const float * xyz1,const float * xyz2,float * match,float * temp);
void matchcostLauncher(int b,int n,int m,const float * xyz1,const float * xyz2,const float * match,float * out);
void matchcostgradLauncher(int b,int n,int m,const float * xyz1,const float * xyz2,const float * match,float * grad1,float * grad2);
class ApproxMatchGpuOp: public OpKernel{
public:
explicit ApproxMatchGpuOp(OpKernelConstruction* context):OpKernel(context){}
void Compute(OpKernelContext * context)override{
const Tensor& xyz1_tensor=context->input(0);
OP_REQUIRES(context,xyz1_tensor.dims()==3 && xyz1_tensor.shape().dim_size(2)==3,errors::InvalidArgument("ApproxMatch expects (batch_size,num_points,3) xyz1 shape"));
auto xyz1_flat=xyz1_tensor.flat<float>();
const float * xyz1=&(xyz1_flat(0));
int b=xyz1_tensor.shape().dim_size(0);
int n=xyz1_tensor.shape().dim_size(1);
//OP_REQUIRES(context,n<=4096,errors::InvalidArgument("ApproxMatch handles at most 4096 dataset points"));
const Tensor& xyz2_tensor=context->input(1);
OP_REQUIRES(context,xyz2_tensor.dims()==3 && xyz2_tensor.shape().dim_size(2)==3 && xyz2_tensor.shape().dim_size(0)==b,errors::InvalidArgument("ApproxMatch expects (batch_size,num_points,3) xyz2 shape, and batch_size must match"));
int m=xyz2_tensor.shape().dim_size(1);
//OP_REQUIRES(context,m<=1024,errors::InvalidArgument("ApproxMatch handles at most 1024 query points"));
auto xyz2_flat=xyz2_tensor.flat<float>();
const float * xyz2=&(xyz2_flat(0));
Tensor * match_tensor=NULL;
OP_REQUIRES_OK(context,context->allocate_output(0,TensorShape{b,m,n},&match_tensor));
auto match_flat=match_tensor->flat<float>();
float * match=&(match_flat(0));
Tensor temp_tensor;
OP_REQUIRES_OK(context,context->allocate_temp(DataTypeToEnum<float>::value,TensorShape{b,(n+m)*2},&temp_tensor));
auto temp_flat=temp_tensor.flat<float>();
float * temp=&(temp_flat(0));
approxmatchLauncher(b,n,m,xyz1,xyz2,match,temp);
}
};
REGISTER_KERNEL_BUILDER(Name("ApproxMatch").Device(DEVICE_GPU), ApproxMatchGpuOp);
class ApproxMatchOp: public OpKernel{
public:
explicit ApproxMatchOp(OpKernelConstruction* context):OpKernel(context){}
void Compute(OpKernelContext * context)override{
const Tensor& xyz1_tensor=context->input(0);
OP_REQUIRES(context,xyz1_tensor.dims()==3 && xyz1_tensor.shape().dim_size(2)==3,errors::InvalidArgument("ApproxMatch expects (batch_size,num_points,3) xyz1 shape"));
auto xyz1_flat=xyz1_tensor.flat<float>();
const float * xyz1=&(xyz1_flat(0));
int b=xyz1_tensor.shape().dim_size(0);
int n=xyz1_tensor.shape().dim_size(1);
//OP_REQUIRES(context,n<=4096,errors::InvalidArgument("ApproxMatch handles at most 4096 dataset points"));
const Tensor& xyz2_tensor=context->input(1);
OP_REQUIRES(context,xyz2_tensor.dims()==3 && xyz2_tensor.shape().dim_size(2)==3 && xyz2_tensor.shape().dim_size(0)==b,errors::InvalidArgument("ApproxMatch expects (batch_size,num_points,3) xyz2 shape, and batch_size must match"));
int m=xyz2_tensor.shape().dim_size(1);
//OP_REQUIRES(context,m<=1024,errors::InvalidArgument("ApproxMatch handles at most 1024 query points"));
auto xyz2_flat=xyz2_tensor.flat<float>();
const float * xyz2=&(xyz2_flat(0));
Tensor * match_tensor=NULL;
OP_REQUIRES_OK(context,context->allocate_output(0,TensorShape{b,m,n},&match_tensor));
auto match_flat=match_tensor->flat<float>();
float * match=&(match_flat(0));
approxmatch_cpu(b,n,m,xyz1,xyz2,match);
}
};
REGISTER_KERNEL_BUILDER(Name("ApproxMatch").Device(DEVICE_CPU), ApproxMatchOp);
class MatchCostGpuOp: public OpKernel{
public:
explicit MatchCostGpuOp(OpKernelConstruction* context):OpKernel(context){}
void Compute(OpKernelContext * context)override{
const Tensor& xyz1_tensor=context->input(0);
OP_REQUIRES(context,xyz1_tensor.dims()==3 && xyz1_tensor.shape().dim_size(2)==3,errors::InvalidArgument("MatchCost expects (batch_size,num_points,3) xyz1 shape"));
auto xyz1_flat=xyz1_tensor.flat<float>();
const float * xyz1=&(xyz1_flat(0));
int b=xyz1_tensor.shape().dim_size(0);
int n=xyz1_tensor.shape().dim_size(1);
const Tensor& xyz2_tensor=context->input(1);
OP_REQUIRES(context,xyz2_tensor.dims()==3 && xyz2_tensor.shape().dim_size(2)==3 && xyz2_tensor.shape().dim_size(0)==b,errors::InvalidArgument("MatchCost expects (batch_size,num_points,3) xyz2 shape, and batch_size must match"));
int m=xyz2_tensor.shape().dim_size(1);
auto xyz2_flat=xyz2_tensor.flat<float>();
const float * xyz2=&(xyz2_flat(0));
const Tensor& match_tensor=context->input(2);
OP_REQUIRES(context,match_tensor.dims()==3 && match_tensor.shape().dim_size(0)==b && match_tensor.shape().dim_size(1)==m && match_tensor.shape().dim_size(2)==n,errors::InvalidArgument("MatchCost expects (batch_size,#query,#dataset) match shape"));
auto match_flat=match_tensor.flat<float>();
const float * match=&(match_flat(0));
Tensor * cost_tensor=NULL;
OP_REQUIRES_OK(context,context->allocate_output(0,TensorShape{b},&cost_tensor));
auto cost_flat=cost_tensor->flat<float>();
float * cost=&(cost_flat(0));
matchcostLauncher(b,n,m,xyz1,xyz2,match,cost);
}
};
REGISTER_KERNEL_BUILDER(Name("MatchCost").Device(DEVICE_GPU), MatchCostGpuOp);
class MatchCostOp: public OpKernel{
public:
explicit MatchCostOp(OpKernelConstruction* context):OpKernel(context){}
void Compute(OpKernelContext * context)override{
const Tensor& xyz1_tensor=context->input(0);
OP_REQUIRES(context,xyz1_tensor.dims()==3 && xyz1_tensor.shape().dim_size(2)==3,errors::InvalidArgument("MatchCost expects (batch_size,num_points,3) xyz1 shape"));
auto xyz1_flat=xyz1_tensor.flat<float>();
const float * xyz1=&(xyz1_flat(0));
int b=xyz1_tensor.shape().dim_size(0);
int n=xyz1_tensor.shape().dim_size(1);
const Tensor& xyz2_tensor=context->input(1);
OP_REQUIRES(context,xyz2_tensor.dims()==3 && xyz2_tensor.shape().dim_size(2)==3 && xyz2_tensor.shape().dim_size(0)==b,errors::InvalidArgument("MatchCost expects (batch_size,num_points,3) xyz2 shape, and batch_size must match"));
int m=xyz2_tensor.shape().dim_size(1);
auto xyz2_flat=xyz2_tensor.flat<float>();
const float * xyz2=&(xyz2_flat(0));
const Tensor& match_tensor=context->input(2);
OP_REQUIRES(context,match_tensor.dims()==3 && match_tensor.shape().dim_size(0)==b && match_tensor.shape().dim_size(1)==m && match_tensor.shape().dim_size(2)==n,errors::InvalidArgument("MatchCost expects (batch_size,#query,#dataset) match shape"));
auto match_flat=match_tensor.flat<float>();
const float * match=&(match_flat(0));
Tensor * cost_tensor=NULL;
OP_REQUIRES_OK(context,context->allocate_output(0,TensorShape{b},&cost_tensor));
auto cost_flat=cost_tensor->flat<float>();
float * cost=&(cost_flat(0));
matchcost_cpu(b,n,m,xyz1,xyz2,match,cost);
}
};
REGISTER_KERNEL_BUILDER(Name("MatchCost").Device(DEVICE_CPU), MatchCostOp);
class MatchCostGradGpuOp: public OpKernel{
public:
explicit MatchCostGradGpuOp(OpKernelConstruction* context):OpKernel(context){}
void Compute(OpKernelContext * context)override{
const Tensor& xyz1_tensor=context->input(0);
OP_REQUIRES(context,xyz1_tensor.dims()==3 && xyz1_tensor.shape().dim_size(2)==3,errors::InvalidArgument("MatchCostGrad expects (batch_size,num_points,3) xyz1 shape"));
auto xyz1_flat=xyz1_tensor.flat<float>();
const float * xyz1=&(xyz1_flat(0));
int b=xyz1_tensor.shape().dim_size(0);
int n=xyz1_tensor.shape().dim_size(1);
const Tensor& xyz2_tensor=context->input(1);
OP_REQUIRES(context,xyz2_tensor.dims()==3 && xyz2_tensor.shape().dim_size(2)==3 && xyz2_tensor.shape().dim_size(0)==b,errors::InvalidArgument("MatchCostGrad expects (batch_size,num_points,3) xyz2 shape, and batch_size must match"));
int m=xyz2_tensor.shape().dim_size(1);
auto xyz2_flat=xyz2_tensor.flat<float>();
const float * xyz2=&(xyz2_flat(0));
const Tensor& match_tensor=context->input(2);
OP_REQUIRES(context,match_tensor.dims()==3 && match_tensor.shape().dim_size(0)==b && match_tensor.shape().dim_size(1)==m && match_tensor.shape().dim_size(2)==n,errors::InvalidArgument("MatchCost expects (batch_size,#query,#dataset) match shape"));
auto match_flat=match_tensor.flat<float>();
const float * match=&(match_flat(0));
Tensor * grad1_tensor=NULL;
OP_REQUIRES_OK(context,context->allocate_output(0,TensorShape{b,n,3},&grad1_tensor));
auto grad1_flat=grad1_tensor->flat<float>();
float * grad1=&(grad1_flat(0));
Tensor * grad2_tensor=NULL;
OP_REQUIRES_OK(context,context->allocate_output(1,TensorShape{b,m,3},&grad2_tensor));
auto grad2_flat=grad2_tensor->flat<float>();
float * grad2=&(grad2_flat(0));
matchcostgradLauncher(b,n,m,xyz1,xyz2,match,grad1,grad2);
}
};
REGISTER_KERNEL_BUILDER(Name("MatchCostGrad").Device(DEVICE_GPU), MatchCostGradGpuOp);
class MatchCostGradOp: public OpKernel{
public:
explicit MatchCostGradOp(OpKernelConstruction* context):OpKernel(context){}
void Compute(OpKernelContext * context)override{
const Tensor& xyz1_tensor=context->input(0);
OP_REQUIRES(context,xyz1_tensor.dims()==3 && xyz1_tensor.shape().dim_size(2)==3,errors::InvalidArgument("MatchCost expects (batch_size,num_points,3) xyz1 shape"));
auto xyz1_flat=xyz1_tensor.flat<float>();
const float * xyz1=&(xyz1_flat(0));
int b=xyz1_tensor.shape().dim_size(0);
int n=xyz1_tensor.shape().dim_size(1);
const Tensor& xyz2_tensor=context->input(1);
OP_REQUIRES(context,xyz2_tensor.dims()==3 && xyz2_tensor.shape().dim_size(2)==3 && xyz2_tensor.shape().dim_size(0)==b,errors::InvalidArgument("MatchCost expects (batch_size,num_points,3) xyz2 shape, and batch_size must match"));
int m=xyz2_tensor.shape().dim_size(1);
auto xyz2_flat=xyz2_tensor.flat<float>();
const float * xyz2=&(xyz2_flat(0));
const Tensor& match_tensor=context->input(2);
OP_REQUIRES(context,match_tensor.dims()==3 && match_tensor.shape().dim_size(0)==b && match_tensor.shape().dim_size(1)==m && match_tensor.shape().dim_size(2)==n,errors::InvalidArgument("MatchCost expects (batch_size,#query,#dataset) match shape"));
auto match_flat=match_tensor.flat<float>();
const float * match=&(match_flat(0));
Tensor * grad1_tensor=NULL;
OP_REQUIRES_OK(context,context->allocate_output(0,TensorShape{b,n,3},&grad1_tensor));
auto grad1_flat=grad1_tensor->flat<float>();
float * grad1=&(grad1_flat(0));
Tensor * grad2_tensor=NULL;
OP_REQUIRES_OK(context,context->allocate_output(1,TensorShape{b,m,3},&grad2_tensor));
auto grad2_flat=grad2_tensor->flat<float>();
float * grad2=&(grad2_flat(0));
matchcostgrad_cpu(b,n,m,xyz1,xyz2,match,grad1,grad2);
}
};
REGISTER_KERNEL_BUILDER(Name("MatchCostGrad").Device(DEVICE_CPU), MatchCostGradOp);