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sgd_kernel.h
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__global__ void single_sgd_k128_hogwild_kernel(
const Node *R,
unsigned int nnz,
float *p,
float *q,
curandState *state,
float lrate,
int k,
int update_count_this_block,
int update_vector_size,
float lambda
)
{
for(int update_ite = 0; update_ite < update_count_this_block; update_ite ++)
{
int lane_id = threadIdx.x%32;
int local_wid = threadIdx.x/32;
int local_w_num = blockDim.x/32;
int wid = local_w_num*blockIdx.x + local_wid;
unsigned int start_id = 0;
if(lane_id == 0)
{
unsigned int origin = (unsigned int)(curand_uniform(&state[wid])*nnz);
start_id = origin%nnz;
}
// All threads read x from laneid 0
start_id = __shfl_sync(0xffffffff,start_id, 0);
for(int i = 0;i < update_vector_size;i++)
{
int offset = (start_id + i)%nnz;
float r = __ldg(&R[offset].r);
int u = __ldg(&R[offset].u);
int v = __ldg(&R[offset].i);
int base_p = u*k;
int base_q = v*k;
const float tmp_p1 = p[base_p + lane_id];
const float tmp_q1 = q[base_q + lane_id];
const float tmp_p2 = p[base_p + lane_id + 32];
const float tmp_q2 = q[base_q + lane_id + 32];
const float tmp_p3 = p[base_p + lane_id + 64];
const float tmp_q3 = q[base_q + lane_id + 64];
const float tmp_p4 = p[base_p + lane_id + 96];
const float tmp_q4 = q[base_q + lane_id + 96];
float tmp_product = ((tmp_p1*tmp_q1) + (tmp_p2*tmp_q2)) + ((tmp_p3*tmp_q3) + (tmp_p4*tmp_q4));
tmp_product += __shfl_down_sync(0xffffffff, tmp_product, 16);
tmp_product += __shfl_down_sync(0xffffffff, tmp_product, 8);
tmp_product += __shfl_down_sync(0xffffffff, tmp_product, 4);
tmp_product += __shfl_down_sync(0xffffffff, tmp_product, 2);
tmp_product += __shfl_down_sync(0xffffffff, tmp_product, 1);
tmp_product = __shfl_sync(0xffffffff,tmp_product,0);
float ruv = r - tmp_product;
p[base_p + lane_id + 0] = tmp_p1 + lrate*(ruv*tmp_q1 - lambda*tmp_p1);
q[base_q + lane_id + 0] = tmp_q1 + lrate*(ruv*tmp_p1 - lambda*tmp_q1);
p[base_p + lane_id + 32] = tmp_p2 + lrate*(ruv*tmp_q2 - lambda*tmp_p2);
q[base_q + lane_id + 32] = tmp_q2 + lrate*(ruv*tmp_p2 - lambda*tmp_q2);
p[base_p + lane_id + 64] = tmp_p3 + lrate*(ruv*tmp_q3 - lambda*tmp_p3);
q[base_q + lane_id + 64] = tmp_q3 + lrate*(ruv*tmp_p3 - lambda*tmp_q3);
p[base_p + lane_id + 96] = tmp_p4 + lrate*(ruv*tmp_q4 - lambda*tmp_p4);
q[base_q + lane_id + 96] = tmp_q4 + lrate*(ruv*tmp_p4 - lambda*tmp_q4);
}
}
}
__global__ void mem_quant_sgd_k128_hogwild_kernel(
const Node *R,
unsigned int nnz,
half *p,
half *q,
curandState *state,
float lrate,
int k,
int num_iters,
int current_iter,
int update_count_this_block,
int update_vector_size,
float lambda
)
{
for(int update_ite = 0; update_ite < update_count_this_block; update_ite ++)
{
int lane_id = threadIdx.x%32;
int local_wid = threadIdx.x/32;
int local_w_num = blockDim.x/32;
int wid = local_w_num*blockIdx.x + local_wid;
unsigned int start_id = 0;
if(lane_id == 0)
{
unsigned int origin = (unsigned int)(curand_uniform(&state[wid])*nnz);
start_id = origin%nnz;
}
start_id = __shfl_sync(0xffffffff,start_id, 0);
for(int i = 0;i < update_vector_size;i++)
{
int offset = (start_id + i)%nnz;
float r = __ldg(&R[offset].r);
int u = __ldg(&R[offset].u);
int v = __ldg(&R[offset].i);
//read the p & q into register file.
int base_p = u*k;
int base_q = v*k;
float tmp_p1 = __half2float(p[base_p + lane_id]);
float tmp_q1 = __half2float(q[base_q + lane_id]);
float tmp_p2 = __half2float(p[base_p + lane_id + 32]);
float tmp_q2 = __half2float(q[base_q + lane_id + 32]);
float tmp_p3 = __half2float(p[base_p + lane_id + 64]);
float tmp_q3 = __half2float(q[base_q + lane_id + 64]);
float tmp_p4 = __half2float(p[base_p + lane_id + 96]);
float tmp_q4 = __half2float(q[base_q + lane_id + 96]);
float tmp_product = tmp_p1*tmp_q1 + tmp_p2*tmp_q2 + tmp_p3*tmp_q3 + tmp_p4*tmp_q4;
//get dot product.
tmp_product += __shfl_down_sync(0xffffffff,tmp_product, 16);
tmp_product += __shfl_down_sync(0xffffffff,tmp_product, 8);
tmp_product += __shfl_down_sync(0xffffffff,tmp_product, 4);
tmp_product += __shfl_down_sync(0xffffffff,tmp_product, 2);
tmp_product += __shfl_down_sync(0xffffffff,tmp_product, 1);
tmp_product = __shfl_sync(0xffffffff,tmp_product,0);
float ruv = r - tmp_product;
//update
//only works for k=blockDim.x=128
p[base_p + lane_id + 0] = __float2half(tmp_p1 + lrate*(ruv*tmp_q1 - lambda*tmp_p1));
q[base_q + lane_id + 0] = __float2half(tmp_q1 + lrate*(ruv*tmp_p1 - lambda*tmp_q1));
p[base_p + lane_id + 32] = __float2half(tmp_p2 + lrate*(ruv*tmp_q2 - lambda*tmp_p2));
q[base_q + lane_id + 32] = __float2half(tmp_q2 + lrate*(ruv*tmp_p2 - lambda*tmp_q2));
p[base_p + lane_id + 64] = __float2half(tmp_p3 + lrate*(ruv*tmp_q3 - lambda*tmp_p3));
q[base_q + lane_id + 64] = __float2half(tmp_q3 + lrate*(ruv*tmp_p3 - lambda*tmp_q3));
p[base_p + lane_id + 96] = __float2half(tmp_p4 + lrate*(ruv*tmp_q4 - lambda*tmp_p4));
q[base_q + lane_id + 96] = __float2half(tmp_q4 + lrate*(ruv*tmp_p4 - lambda*tmp_q4));
}
}
}
__global__ void switching_only_sgd_k128_hogwild_kernel(
const Node *R,
unsigned int nnz,
void* p,
void* q,
curandState *state,
float lrate_f,
int k,
int update_count_this_block,
int update_vector_size,
float lambda_f,
unsigned char cur_precision,
unsigned int first_sample_rating_idx,
float* sum_updated_val,
float* sum_norms
)
{
unsigned int processed_cnt = 0;
float sum_norms_reg = 0;
int lane_id = threadIdx.x%32;
int local_wid = threadIdx.x/32;
int local_w_num = blockDim.x/32;
int wid = local_w_num*blockIdx.x + local_wid;
for(int update_ite = 0; update_ite < update_count_this_block; update_ite ++)
{
unsigned int start_id = 0;
if(lane_id == 0)
{
unsigned int origin = (unsigned int)(curand_uniform(&state[wid])*nnz);
start_id = origin%nnz;
}
start_id = __shfl_sync(0xffffffff,start_id, 0);
for(int i = 0;i < update_vector_size;i++)
{
int offset = (start_id + i)%nnz;
float r = __ldg(&R[offset].r);
int u = __ldg(&R[offset].u);
int v = __ldg(&R[offset].i);
int base_p = u*k;
int base_q = v*k;
if (!cur_precision){
__half lrate = __float2half(lrate_f);
__half lambda = __float2half(lambda_f);
__half r_h = __float2half(r);
__half* tmp_p_ptr = (__half*)p;
__half* tmp_q_ptr = (__half*)q;
const __half tmp_p1 = tmp_p_ptr[base_p + lane_id];
const __half tmp_q1 = tmp_q_ptr[base_q + lane_id];
const __half tmp_p2 = tmp_p_ptr[base_p + lane_id + 32];
const __half tmp_q2 = tmp_q_ptr[base_q + lane_id + 32];
const __half tmp_p3 = tmp_p_ptr[base_p + lane_id + 64];
const __half tmp_q3 = tmp_q_ptr[base_q + lane_id + 64];
const __half tmp_p4 = tmp_p_ptr[base_p + lane_id + 96];
const __half tmp_q4 = tmp_q_ptr[base_q + lane_id + 96];
__half tmp_product = ((tmp_p1*tmp_q1) + (tmp_p2*tmp_q2)) + ((tmp_p3*tmp_q3) + (tmp_p4*tmp_q4));
tmp_product += __shfl_down_sync(0xffffffff, tmp_product, 16);
tmp_product += __shfl_down_sync(0xffffffff, tmp_product, 8);
tmp_product += __shfl_down_sync(0xffffffff, tmp_product, 4);
tmp_product += __shfl_down_sync(0xffffffff, tmp_product, 2);
tmp_product += __shfl_down_sync(0xffffffff, tmp_product, 1);
tmp_product = __shfl_sync(0xffffffff,tmp_product,0);
const __half ruv = r_h - tmp_product;
const __half tmp_p1_updated_val = ((ruv*tmp_q1) - (lambda*tmp_p1));
const __half tmp_q1_updated_val = ((ruv*tmp_p1) - (lambda*tmp_q1));
const __half tmp_p2_updated_val = ((ruv*tmp_q2) - (lambda*tmp_p2));
const __half tmp_q2_updated_val = ((ruv*tmp_p2) - (lambda*tmp_q2));
const __half tmp_p3_updated_val = ((ruv*tmp_q3) - (lambda*tmp_p3));
const __half tmp_q3_updated_val = ((ruv*tmp_p3) - (lambda*tmp_q3));
const __half tmp_p4_updated_val = ((ruv*tmp_q4) - (lambda*tmp_p4));
const __half tmp_q4_updated_val = ((ruv*tmp_p4) - (lambda*tmp_q4));
tmp_p_ptr[base_p + lane_id] = __hfma(lrate, tmp_p1_updated_val, tmp_p1);
tmp_q_ptr[base_q + lane_id] = __hfma(lrate, tmp_q1_updated_val, tmp_q1);
tmp_p_ptr[base_p + lane_id + 32] = __hfma(lrate, tmp_p2_updated_val, tmp_p2);
tmp_q_ptr[base_q + lane_id + 32] = __hfma(lrate, tmp_q2_updated_val, tmp_q2);
tmp_p_ptr[base_p + lane_id + 64] = __hfma(lrate, tmp_p3_updated_val, tmp_p3);
tmp_q_ptr[base_q + lane_id + 64] = __hfma(lrate, tmp_q3_updated_val, tmp_q3);
tmp_p_ptr[base_p + lane_id + 96] = __hfma(lrate, tmp_p4_updated_val, tmp_p4);
tmp_q_ptr[base_q + lane_id + 96] = __hfma(lrate, tmp_q4_updated_val, tmp_q4);
const float tmp_p1_updated_val_f = __half2float(tmp_p1_updated_val);
const float tmp_q1_updated_val_f = __half2float(tmp_q1_updated_val);
const float tmp_p2_updated_val_f = __half2float(tmp_p2_updated_val);
const float tmp_q2_updated_val_f = __half2float(tmp_q2_updated_val);
const float tmp_p3_updated_val_f = __half2float(tmp_p3_updated_val);
const float tmp_q3_updated_val_f = __half2float(tmp_q3_updated_val);
const float tmp_p4_updated_val_f = __half2float(tmp_p4_updated_val);
const float tmp_q4_updated_val_f = __half2float(tmp_q4_updated_val);
if (processed_cnt >= first_sample_rating_idx){
float norm_p = ((tmp_p1_updated_val_f*tmp_p1_updated_val_f) + (tmp_p2_updated_val_f*tmp_p2_updated_val_f)) + ((tmp_p3_updated_val_f*tmp_p3_updated_val_f) + (tmp_p4_updated_val_f*tmp_p4_updated_val_f));
float norm_q = ((tmp_q1_updated_val_f*tmp_q1_updated_val_f) + (tmp_q2_updated_val_f*tmp_q2_updated_val_f)) + ((tmp_q3_updated_val_f*tmp_q3_updated_val_f) + (tmp_q4_updated_val_f*tmp_q4_updated_val_f));
float norm_pq = norm_p + norm_q;
norm_pq += __shfl_down_sync(0xffffffff, norm_pq, 16);
norm_pq += __shfl_down_sync(0xffffffff, norm_pq, 8);
norm_pq += __shfl_down_sync(0xffffffff, norm_pq, 4);
norm_pq += __shfl_down_sync(0xffffffff, norm_pq, 2);
norm_pq += __shfl_down_sync(0xffffffff, norm_pq, 1);
if (lane_id == 0){
sum_norms_reg += norm_pq;
}
atomicAdd(sum_updated_val + lane_id, tmp_p1_updated_val_f + tmp_q1_updated_val_f);
atomicAdd(sum_updated_val + lane_id + 32, tmp_p2_updated_val_f + tmp_q2_updated_val_f);
atomicAdd(sum_updated_val + lane_id + 64, tmp_p3_updated_val_f + tmp_q3_updated_val_f);
atomicAdd(sum_updated_val + lane_id + 96, tmp_p4_updated_val_f + tmp_q4_updated_val_f);
}
}
else {
float* tmp_p_ptr = (float*)p;
float* tmp_q_ptr = (float*)q;
float tmp_p1 = tmp_p_ptr[base_p + lane_id];
float tmp_q1 = tmp_q_ptr[base_q + lane_id];
float tmp_p2 = tmp_p_ptr[base_p + lane_id + 32];
float tmp_q2 = tmp_q_ptr[base_q + lane_id + 32];
float tmp_p3 = tmp_p_ptr[base_p + lane_id + 64];
float tmp_q3 = tmp_q_ptr[base_q + lane_id + 64];
float tmp_p4 = tmp_p_ptr[base_p + lane_id + 96];
float tmp_q4 = tmp_q_ptr[base_q + lane_id + 96];
float tmp_product = ((tmp_p1*tmp_q1) + (tmp_p2*tmp_q2)) + ((tmp_p3*tmp_q3) + (tmp_p4*tmp_q4));
tmp_product += __shfl_down_sync(0xffffffff, tmp_product, 16);
tmp_product += __shfl_down_sync(0xffffffff, tmp_product, 8);
tmp_product += __shfl_down_sync(0xffffffff, tmp_product, 4);
tmp_product += __shfl_down_sync(0xffffffff, tmp_product, 2);
tmp_product += __shfl_down_sync(0xffffffff, tmp_product, 1);
tmp_product = __shfl_sync(0xffffffff,tmp_product,0);
float ruv = r - tmp_product;
tmp_p_ptr[base_p + lane_id] = fmaf(lrate_f, (ruv*tmp_q1 - lambda_f*tmp_p1), tmp_p1);
tmp_q_ptr[base_q + lane_id] = fmaf(lrate_f, (ruv*tmp_p1 - lambda_f*tmp_q1), tmp_q1);
tmp_p_ptr[base_p + lane_id + 32] = fmaf(lrate_f, (ruv*tmp_q2 - lambda_f*tmp_p2), tmp_p2);
tmp_q_ptr[base_q + lane_id + 32] = fmaf(lrate_f, (ruv*tmp_p2 - lambda_f*tmp_q2), tmp_q2);
tmp_p_ptr[base_p + lane_id + 64] = fmaf(lrate_f, (ruv*tmp_q3 - lambda_f*tmp_p3), tmp_p3);
tmp_q_ptr[base_q + lane_id + 64] = fmaf(lrate_f, (ruv*tmp_p3 - lambda_f*tmp_q3), tmp_q3);
tmp_p_ptr[base_p + lane_id + 96] = fmaf(lrate_f, (ruv*tmp_q4 - lambda_f*tmp_p4), tmp_p4);
tmp_q_ptr[base_q + lane_id + 96] = fmaf(lrate_f, (ruv*tmp_p4 - lambda_f*tmp_q4), tmp_q4);
}
processed_cnt += 1;
}
}
if (lane_id == 0) sum_norms[wid] = sum_norms_reg;
}