major change: use luarocks to manage project

6 files changed, 0 insertions, 1382 deletions

diff --git a/matrix/generic/cukernel.cu b/matrix/generic/cukernel.cu
deleted file mode 100644
index d6c8adc..0000000
--- a/matrix/generic/cukernel.cu
+++ /dev/null
@@ -1,571 +0,0 @@
-#ifdef NERV_GENERIC_CUKERNEL
-#include <assert.h>
-#include <stdio.h>
-#include "matrix.h"
-#include "cuda.h"
-#include "float.h"
-#define CUDA_THREADS_N 16
-#define CUDA_THREADS_NN ((CUDA_THREADS_N) * (CUDA_THREADS_N))
-#define CEIL_DIV(a, b) (((a) + (b) - 1) / (b))
-__global__ void cudak_(log_elem)(const MATRIX_ELEM *a, MATRIX_ELEM *b, 
-                                int nrow, int ncol, int stride) {
-    int j = blockIdx.x * blockDim.x + threadIdx.x;
-    int i = blockIdx.y * blockDim.y + threadIdx.y;
-    long idx;
-    MATRIX_ELEM tmp;
-    if (i >= nrow || j >= ncol) return;
-    idx = j + i * stride;
-    tmp = a[idx];
-    if(tmp < FLT_MIN) tmp = FLT_MIN;
-    b[idx] = log(tmp);
-}
-
-__global__ void cudak_(mul_elem)(const MATRIX_ELEM *a, const MATRIX_ELEM *b,
-                                MATRIX_ELEM *c, 
-                                int nrow, int ncol, int stride) {
-    int j = blockIdx.x * blockDim.x + threadIdx.x;
-    int i = blockIdx.y * blockDim.y + threadIdx.y;
-    long idx;
-    if (i >= nrow || j >= ncol) return;
-    idx = j + i * stride;
-    c[idx] = a[idx] * b[idx];
-}
-
-__global__ void cudak_(sigmoid)(const MATRIX_ELEM *a, MATRIX_ELEM *b,
-                        int nrow, int ncol, int stride) {
-    int j = blockIdx.x * blockDim.x + threadIdx.x;
-    int i = blockIdx.y * blockDim.y + threadIdx.y;
-    long idx;
-    if (i >= nrow || j >= ncol) return;
-    idx = j + i * stride;
-    b[idx] = 1.0 / (1.0 + exp(-a[idx]));
-}
-
-__global__ void cudak_(sigmoid_grad)(const MATRIX_ELEM *output,
-                                    const MATRIX_ELEM *err,
-                                    MATRIX_ELEM *nerr,
-                                    int nrow, int ncol, int stride) {
-    int j = blockIdx.x * blockDim.x + threadIdx.x;
-    int i = blockIdx.y * blockDim.y + threadIdx.y;
-    long idx;
-    if (i >= nrow || j >= ncol) return;
-    idx = j + i * stride;
-    nerr[idx] = output[idx] * (1.0 - output[idx]) * err[idx];
-}
-
-__global__ void cudak_(softmax_final)(const MATRIX_ELEM *a, MATRIX_ELEM *b,
-                        const MATRIX_ELEM *max, const MATRIX_ELEM *deno,
-                        int nrow, int ncol, int stride, int mstride) {
-    int j = blockIdx.x * blockDim.x + threadIdx.x;
-    int i = blockIdx.y * blockDim.y + threadIdx.y;
-    long idx;
-    if (i >= nrow || j >= ncol) return;
-    idx = j + i * stride;
-    b[idx] = exp(a[idx] - max[0 + i * mstride]) / deno[0 + i * mstride];
-}
-
-__global__ void cudak_(block_reduce_rowsum)(const MATRIX_ELEM *input,
-                                            MATRIX_ELEM *output,
-                                            const int istride, const int ostride,
-                                            const int n) {
-    extern __shared__ MATRIX_ELEM cudak_(arr)[];
-    int j = blockIdx.x * blockDim.x + threadIdx.x;
-    cudak_(arr)[threadIdx.x] = j < n ? input[j + istride * blockIdx.y] : 0;
-    __syncthreads();
-    for (int offset = blockDim.x >> 1;  offset; offset >>= 1)
-    {
-        if (threadIdx.x < offset)
-            cudak_(arr)[threadIdx.x] += cudak_(arr)[threadIdx.x + offset];
-        __syncthreads();
-    }
-    if (threadIdx.x == 0)
-        output[blockIdx.x + ostride * blockIdx.y] = cudak_(arr)[0];
-}
-
-__global__ void cudak_(block_reduce_colsum)(const MATRIX_ELEM *input,
-                                MATRIX_ELEM *output,
-                                const int istride, const int ostride,
-                                const int n) {
-    extern __shared__ MATRIX_ELEM cudak_(arr)[];
-    int i = blockIdx.y * blockDim.y + threadIdx.y;
-    cudak_(arr)[threadIdx.y] = i < n ? input[blockIdx.x + istride * i] : 0;
-    __syncthreads();
-    for (int offset = blockDim.y >> 1;  offset; offset >>= 1)
-    {
-        if (threadIdx.y < offset)
-            cudak_(arr)[threadIdx.y] += cudak_(arr)[threadIdx.y + offset];
-        __syncthreads();
-    }
-    if (threadIdx.y == 0)
-        output[blockIdx.x + ostride * blockIdx.y] = cudak_(arr)[0];
-}
-
-__global__ void cudak_(block_reduce_colsame)(const MATRIX_ELEM *input,
-                                            const MATRIX_ELEM *ref_input,
-                                            MATRIX_ELEM *output,
-                                            const int istride, const int ostride,
-                                            const int n) {
-    extern __shared__ MATRIX_ELEM cudak_(arr)[];
-    int i = blockIdx.y * blockDim.y + threadIdx.y;
-    cudak_(arr)[threadIdx.y] = (i < n && input[blockIdx.x + istride * i] == \
-                                        ref_input[blockIdx.x + istride * i]) ? 1.0 : 0;
-    __syncthreads();
-    for (int offset = blockDim.y >> 1;  offset; offset >>= 1)
-    {
-        if (threadIdx.y < offset)
-            cudak_(arr)[threadIdx.y] += cudak_(arr)[threadIdx.y + offset];
-        __syncthreads();
-    }
-    if (threadIdx.y == 0)
-        output[blockIdx.x + ostride * blockIdx.y] = cudak_(arr)[0];
-}
-
-__global__ void cudak_(block_reduce_softmax_rowsum)(const MATRIX_ELEM *input,
-                                        MATRIX_ELEM *output,
-                                        const MATRIX_ELEM *max,
-                                        const int istride, const int ostride,
-                                        const int mstride, const int n) {
-    extern __shared__ MATRIX_ELEM cudak_(arr)[];
-    int j = blockIdx.x * blockDim.x + threadIdx.x;
-    cudak_(arr)[threadIdx.x] = j < n ? exp(input[j + istride * blockIdx.y] - \
-                                    max[0 + mstride * blockIdx.y]) : 0;
-    __syncthreads();
-    for (int offset = blockDim.x >> 1;  offset; offset >>= 1)
-    {
-        if (threadIdx.x < offset)
-            cudak_(arr)[threadIdx.x] += cudak_(arr)[threadIdx.x + offset];
-        __syncthreads();
-    }
-    if (threadIdx.x == 0)
-        output[blockIdx.x + ostride * blockIdx.y] = cudak_(arr)[0];
-}
-
-__global__ void cudak_(block_reduce_rowmax)(const MATRIX_ELEM *input,
-                                            MATRIX_ELEM *output,
-                                            const int istride, const int ostride,
-                                            const int n) {
-    extern __shared__ MATRIX_ELEM cudak_(arr)[];
-    int j = blockIdx.x * blockDim.x + threadIdx.x;
-    cudak_(arr)[threadIdx.x] = j < n ? input[j + istride * blockIdx.y] : -FLT_MAX;
-    __syncthreads();
-    for (int offset = blockDim.x >> 1;  offset; offset >>= 1)
-    {
-        if (threadIdx.x < offset)
-        {
-            MATRIX_ELEM l = cudak_(arr)[threadIdx.x],
-                        r = cudak_(arr)[threadIdx.x + offset];
-            if (r > l)
-                cudak_(arr)[threadIdx.x] = r;
-        }
-        __syncthreads();
-    }
-    if (threadIdx.x == 0)
-        output[blockIdx.x + ostride * blockIdx.y] = cudak_(arr)[0];
-}
-
-__global__ void cudak_(block_reduce_rowmax_idx)(const MATRIX_ELEM *input,
-                                                const MATRIX_ELEM *idx_input,
-                                                MATRIX_ELEM *output,
-                                                MATRIX_ELEM *idx_output,
-                                                const int istride, const int ostride,
-                                                const int n) {
-    extern __shared__ MATRIX_ELEM cudak_(arr)[];
-    MATRIX_ELEM *arr_val = cudak_(arr);
-    MATRIX_ELEM *arr_idx = arr_val + blockDim.x;
-    int j = blockIdx.x * blockDim.x + threadIdx.x;
-    arr_val[threadIdx.x] = j < n ? input[j + istride * blockIdx.y] : -FLT_MAX;
-    arr_idx[threadIdx.x] = j < n ? idx_input[j + istride * blockIdx.y] : 0;
-    __syncthreads();
-    for (int offset = blockDim.x >> 1;  offset; offset >>= 1)
-    {
-        if (threadIdx.x < offset)
-        {
-            MATRIX_ELEM l = arr_val[threadIdx.x],
-                        r = arr_val[threadIdx.x + offset];
-            if (r > l)
-            {
-                arr_val[threadIdx.x] = r;
-                arr_idx[threadIdx.x] = arr_idx[threadIdx.x + offset];
-            }
-        }
-        __syncthreads();
-    }
-    if (threadIdx.x == 0)
-    {
-        output[blockIdx.x + ostride * blockIdx.y] = arr_val[0];
-        idx_output[blockIdx.x + ostride * blockIdx.y] = arr_idx[0];
-    }
-}
-
-__global__ void cudak_(add_row)(const MATRIX_ELEM *a, MATRIX_ELEM *b,
-                                int nrow, int ncol, int stride, double beta) {
-    int j = blockIdx.x * blockDim.x + threadIdx.x;
-    int i = blockIdx.y * blockDim.y + threadIdx.y;
-    if (i >= nrow || j >= ncol) return;
-    b[j + i * stride] += beta * a[j];
-}
-
-__global__ void cudak_(fill)(MATRIX_ELEM *a,
-                            int nrow, int ncol, int stride, double val) {
-    int j = blockIdx.x * blockDim.x + threadIdx.x;
-    int i = blockIdx.y * blockDim.y + threadIdx.y;
-    if (i >= nrow || j >= ncol) return;
-    a[j + i * stride] = val;
-}
-
-__global__ void cudak_(expand_frm)(const MATRIX_ELEM *a, MATRIX_ELEM *b,
-                                    int nrow, int ncol,
-                                    int enrow, int encol,
-                                    int stride, int estride,
-                                    int context) {
-    int j = blockIdx.x * blockDim.x + threadIdx.x;
-    int i = blockIdx.y * blockDim.y + threadIdx.y;
-    int ridx;
-    if (i >= enrow || j >= encol) return;
-    ridx = i + j / ncol - context;
-    if (ridx < 0) ridx = 0;
-    else if (ridx >= nrow) ridx = nrow - 1;
-    b[j + i * estride] = a[j % ncol + ridx * stride];
-}
-
-__global__ void cudak_(rearrange_frm)(const MATRIX_ELEM *a, MATRIX_ELEM *b,
-                                    int nrow, int ncol,
-                                    int stride, int step, int orig_dim) {
-    int j = blockIdx.x * blockDim.x + threadIdx.x;
-    int i = blockIdx.y * blockDim.y + threadIdx.y;
-    if (i >= nrow || j >= ncol) return;
-    b[j + i * stride] = a[j / step + (j % step) * orig_dim + i * stride];
-}
-
-__global__ void cudak_(scale_rows_by_col)(const MATRIX_ELEM *a, MATRIX_ELEM *b,
-                                        int nrow, int ncol,
-                                        int astride, int bstride) {
-    int j = blockIdx.x * blockDim.x + threadIdx.x;
-    int i = blockIdx.y * blockDim.y + threadIdx.y;
-    if (i >= nrow || j >= ncol) return;
-    b[j + i * bstride] *= a[i * astride];
-}
-
-__global__ void cudak_(scale_rows_by_row)(const MATRIX_ELEM *a, MATRIX_ELEM *b,
-                                        int nrow, int ncol,
-                                        int stride) {
-    int j = blockIdx.x * blockDim.x + threadIdx.x;
-    int i = blockIdx.y * blockDim.y + threadIdx.y;
-    if (i >= nrow || j >= ncol) return;
-    b[j + i * stride] *= a[j];
-}
-
-__global__ void cudak_(decompress)(const MATRIX_ELEM *a, MATRIX_ELEM *b,
-                                    int nrow, int ncol,
-                                    int stride_a, int stride_b) {
-    int j = blockIdx.x * blockDim.x + threadIdx.x;
-    int i = blockIdx.y * blockDim.y + threadIdx.y;
-    if (i >= nrow || j >= ncol) return;
-    b[lrintf(a[j + i * stride_a]) + i * stride_b] = 1.0;
-}
-
-__global__ void cudak_(gen_col_idx)(MATRIX_ELEM *b,
-                                    int nrow, int ncol, int stride) {
-    int j = blockIdx.x * blockDim.x + threadIdx.x;
-    int i = blockIdx.y * blockDim.y + threadIdx.y;
-    if (i >= nrow || j >= ncol) return;
-    b[j + i * stride] = j;
-}
-
-extern "C" {
-#include "../cukernel.h"
-    void cudak_(cuda_log_elem)(const Matrix *a, Matrix *b) {
-        dim3 threadsPerBlock(CUDA_THREADS_N, CUDA_THREADS_N);
-        dim3 numBlocks(CEIL_DIV(b->ncol, threadsPerBlock.x),
-                CEIL_DIV(b->nrow, threadsPerBlock.y));
-        cudak_(log_elem)<<<numBlocks, threadsPerBlock>>> \
-            (MATRIX_ELEM_PTR(a), MATRIX_ELEM_PTR(b),
-             b->nrow, b->ncol, b->stride / sizeof(MATRIX_ELEM));
-        cudaStreamSynchronize(0);
-    }
-
-    void cudak_(cuda_mul_elem)(const Matrix *a, const Matrix *b,
-                                Matrix *c) {
-        dim3 threadsPerBlock(CUDA_THREADS_N, CUDA_THREADS_N);
-        dim3 numBlocks(CEIL_DIV(b->ncol, threadsPerBlock.x),
-                CEIL_DIV(b->nrow, threadsPerBlock.y));
-        cudak_(mul_elem)<<<numBlocks, threadsPerBlock>>> \
-            (MATRIX_ELEM_PTR(a), MATRIX_ELEM_PTR(b),
-             MATRIX_ELEM_PTR(c),
-             b->nrow, b->ncol, b->stride / sizeof(MATRIX_ELEM));
-        cudaStreamSynchronize(0);
-    }
-
-    void cudak_(cuda_sigmoid)(const Matrix *a, Matrix *b) {
-        dim3 threadsPerBlock(CUDA_THREADS_N, CUDA_THREADS_N);
-        dim3 numBlocks(CEIL_DIV(b->ncol, threadsPerBlock.x),
-                CEIL_DIV(b->nrow, threadsPerBlock.y));
-        cudak_(sigmoid)<<<numBlocks, threadsPerBlock>>> \
-            (MATRIX_ELEM_PTR(a), MATRIX_ELEM_PTR(b), b->nrow, b->ncol,
-            b->stride / sizeof(MATRIX_ELEM));
-        cudaStreamSynchronize(0);
-    }
-
-    void cudak_(cuda_sigmoid_grad)(const Matrix *output,
-                                    const Matrix *err, Matrix *nerr) {
-        dim3 threadsPerBlock(CUDA_THREADS_N, CUDA_THREADS_N);
-        dim3 numBlocks(CEIL_DIV(nerr->ncol, threadsPerBlock.x),
-                CEIL_DIV(nerr->nrow, threadsPerBlock.y));
-        cudak_(sigmoid_grad)<<<numBlocks, threadsPerBlock>>> \
-            (MATRIX_ELEM_PTR(output), MATRIX_ELEM_PTR(err),
-             MATRIX_ELEM_PTR(nerr),
-             nerr->nrow, nerr->ncol,
-             nerr->stride / sizeof(MATRIX_ELEM));
-        cudaStreamSynchronize(0);
-    }
-
-    void cudak_(cuda_rowsum)(const Matrix *a, Matrix *b) {
-        dim3 block(CUDA_THREADS_NN, 1);
-        int ncol = a->ncol;
-        int blocks_per_row = CEIL_DIV(ncol, block.x);
-        dim3 grid(blocks_per_row, a->nrow);
-        MATRIX_ELEM *res;
-        size_t stride;
-        cudaMallocPitch(&res, &stride, blocks_per_row * sizeof(MATRIX_ELEM), a->nrow);
-        cudak_(block_reduce_rowsum)<<<grid, block, block.x * sizeof(MATRIX_ELEM)>>> \
-            (MATRIX_ELEM_PTR(a), res,
-             a->stride / sizeof(MATRIX_ELEM), stride / sizeof(MATRIX_ELEM),
-             ncol);
-        ncol = blocks_per_row;
-        assert((unsigned long)ncol <= block.x);
-        grid.x = 1;
-        cudaStreamSynchronize(0);
-        cudak_(block_reduce_rowsum)<<<grid, block, block.x * sizeof(MATRIX_ELEM)>>> \
-            (res, MATRIX_ELEM_PTR(b),
-             stride / sizeof(MATRIX_ELEM), b->stride / sizeof(MATRIX_ELEM),
-             ncol);
-        cudaStreamSynchronize(0);
-        cudaFree(res);
-    }
-
-    void cudak_(cuda_colsame)(const Matrix *a, const Matrix *ref, Matrix *b) {
-        dim3 block(1, CUDA_THREADS_NN);
-        int nrow = a->nrow;
-        int blocks_per_col = CEIL_DIV(nrow, block.y);
-        dim3 grid(a->ncol, blocks_per_col);
-        MATRIX_ELEM *res;
-        size_t stride;
-        cudaMallocPitch(&res, &stride, a->ncol * sizeof(MATRIX_ELEM), blocks_per_col);
-        cudak_(block_reduce_colsame)<<<grid, block, block.y * sizeof(MATRIX_ELEM)>>> \
-            (MATRIX_ELEM_PTR(a), MATRIX_ELEM_PTR(ref), res,
-             a->stride / sizeof(MATRIX_ELEM), stride / sizeof(MATRIX_ELEM),
-             nrow);
-        nrow = blocks_per_col;
-        assert((unsigned long)nrow <= block.y);
-        grid.y = 1;
-        cudaStreamSynchronize(0);
-        cudak_(block_reduce_colsum)<<<grid, block, block.y * sizeof(MATRIX_ELEM)>>> \
-            (res, MATRIX_ELEM_PTR(b),
-             stride / sizeof(MATRIX_ELEM), b->stride / sizeof(MATRIX_ELEM),
-             nrow);
-        cudaStreamSynchronize(0);
-        cudaFree(res);
-    }
-
-    void cudak_(cuda_colsum)(const Matrix *a, Matrix *b) {
-        dim3 block(1, CUDA_THREADS_NN);
-        int nrow = a->nrow;
-        int blocks_per_col = CEIL_DIV(nrow, block.y);
-        dim3 grid(a->ncol, blocks_per_col);
-        MATRIX_ELEM *res;
-        size_t stride;
-        cudaMallocPitch(&res, &stride, a->ncol * sizeof(MATRIX_ELEM), blocks_per_col);
-        cudak_(block_reduce_colsum)<<<grid, block, block.y * sizeof(MATRIX_ELEM)>>> \
-            (MATRIX_ELEM_PTR(a), res,
-             a->stride / sizeof(MATRIX_ELEM), stride / sizeof(MATRIX_ELEM),
-             nrow);
-        nrow = blocks_per_col;
-        assert((unsigned long)nrow <= block.y);
-        grid.y = 1;
-        cudaStreamSynchronize(0);
-        cudak_(block_reduce_colsum)<<<grid, block, block.y * sizeof(MATRIX_ELEM)>>> \
-            (res, MATRIX_ELEM_PTR(b),
-             stride / sizeof(MATRIX_ELEM), b->stride / sizeof(MATRIX_ELEM),
-             nrow);
-        cudaStreamSynchronize(0);
-        cudaFree(res);
-    }
-
-    void cudak_(cuda_softmax_final)(const Matrix *a, const Matrix *max,
-                            const Matrix *deno, Matrix *b) {
-        dim3 threadsPerBlock(CUDA_THREADS_N, CUDA_THREADS_N);
-        dim3 numBlocks(CEIL_DIV(b->ncol, threadsPerBlock.x),
-                CEIL_DIV(b->nrow, threadsPerBlock.y));
-        cudak_(softmax_final)<<<numBlocks, threadsPerBlock>>> \
-                (MATRIX_ELEM_PTR(a), MATRIX_ELEM_PTR(b),
-                MATRIX_ELEM_PTR(max), MATRIX_ELEM_PTR(deno),
-                b->nrow, b->ncol,
-                b->stride / sizeof(MATRIX_ELEM),
-                max->stride / sizeof(MATRIX_ELEM));
-        cudaStreamSynchronize(0);
-    }
-
-    void cudak_(cuda_softmax_denominator)(const Matrix *a, const Matrix *max, Matrix *b) {
-        dim3 block(CUDA_THREADS_NN, 1);
-        int ncol = a->ncol;
-        int blocks_per_row = CEIL_DIV(ncol, block.x);
-        dim3 grid(blocks_per_row, a->nrow);
-        MATRIX_ELEM *res;
-        size_t stride;
-        assert(max->ncol == 1);
-        cudaMallocPitch(&res, &stride, blocks_per_row * sizeof(MATRIX_ELEM), a->nrow);
-        cudak_(block_reduce_softmax_rowsum) \
-            <<<grid, block, block.x * sizeof(MATRIX_ELEM)>>> \
-            (MATRIX_ELEM_PTR(a), res, MATRIX_ELEM_PTR(max),
-             a->stride / sizeof(MATRIX_ELEM), stride / sizeof(MATRIX_ELEM),
-             max->stride / sizeof(MATRIX_ELEM),
-             ncol);
-        ncol = blocks_per_row;
-        assert((unsigned long)ncol <= block.x);
-        grid.x = 1;
-        cudaStreamSynchronize(0);
-        cudak_(block_reduce_rowsum) \
-            <<<grid, block, block.x * sizeof(MATRIX_ELEM)>>> \
-            (res, MATRIX_ELEM_PTR(b),
-             stride / sizeof(MATRIX_ELEM), b->stride / sizeof(MATRIX_ELEM),
-             ncol);
-        cudaStreamSynchronize(0);
-        cudaFree(res);
-    }
-
-    void cudak_(cuda_rowmax)(const Matrix *a, Matrix *b) {
-        dim3 block(CUDA_THREADS_NN, 1);
-        int ncol = a->ncol;
-        int blocks_per_row = CEIL_DIV(ncol, block.x);
-        dim3 grid(blocks_per_row, a->nrow);
-        MATRIX_ELEM *res;
-        size_t stride;
-        cudaMallocPitch(&res, &stride, blocks_per_row * sizeof(MATRIX_ELEM), a->nrow);
-        cudak_(block_reduce_rowmax)<<<grid, block, block.x * sizeof(MATRIX_ELEM)>>> \
-            (MATRIX_ELEM_PTR(a), res,
-             a->stride / sizeof(MATRIX_ELEM), stride / sizeof(MATRIX_ELEM),
-             ncol);
-        ncol = blocks_per_row;
-        assert((unsigned long)ncol <= block.x);
-        grid.x = 1;
-        cudaStreamSynchronize(0);
-        cudak_(block_reduce_rowmax)<<<grid, block, block.x * sizeof(MATRIX_ELEM)>>> \
-            (res, MATRIX_ELEM_PTR(b),
-             stride / sizeof(MATRIX_ELEM), b->stride / sizeof(MATRIX_ELEM),
-             ncol);
-        cudaStreamSynchronize(0);
-        cudaFree(res);
-    }
-
-    void cudak_(cuda_rowmax_idx)(const Matrix *a, Matrix *b, Matrix *b_idx) {
-        dim3 block(CUDA_THREADS_NN, 1);
-        int ncol = a->ncol;
-        int blocks_per_row = CEIL_DIV(ncol, block.x);
-        dim3 grid(blocks_per_row, a->nrow);
-        MATRIX_ELEM *a_idx, *res, *res_idx;
-        size_t stride;
-        cudaMallocPitch(&a_idx, &stride, a->stride, a->nrow);
-        cudak_(gen_col_idx)<<<grid, block>>>(a_idx, a->nrow, ncol, stride / sizeof(MATRIX_ELEM));
-        cudaMallocPitch(&res, &stride, blocks_per_row * sizeof(MATRIX_ELEM), a->nrow);
-        cudaMallocPitch(&res_idx, &stride, blocks_per_row * sizeof(MATRIX_ELEM), a->nrow);
-        cudaStreamSynchronize(0);
-        cudak_(block_reduce_rowmax_idx)<<<grid, block,
-                                        2 * block.x * sizeof(MATRIX_ELEM)>>> \
-            (MATRIX_ELEM_PTR(a), a_idx, res, res_idx,
-             a->stride / sizeof(MATRIX_ELEM), stride / sizeof(MATRIX_ELEM),
-             ncol);
-        ncol = blocks_per_row;
-        assert((unsigned long)ncol <= block.x);
-        grid.x = 1;
-        cudaStreamSynchronize(0);
-        cudak_(block_reduce_rowmax_idx)<<<grid, block,
-                                        2 * block.x * sizeof(MATRIX_ELEM)>>> \
-            (res, res_idx, MATRIX_ELEM_PTR(b), MATRIX_ELEM_PTR(b_idx),
-             stride / sizeof(MATRIX_ELEM), b->stride / sizeof(MATRIX_ELEM),
-             ncol);
-        cudaStreamSynchronize(0);
-        cudaFree(a_idx);
-        cudaFree(res);
-        cudaFree(res_idx);
-    }
-
-    /* in-place calc */
-    void cudak_(cuda_add_row)(const Matrix *a, Matrix *b, double beta) {
-        dim3 threadsPerBlock(CUDA_THREADS_N, CUDA_THREADS_N);
-        dim3 numBlocks(CEIL_DIV(b->ncol, threadsPerBlock.x),
-                CEIL_DIV(b->nrow, threadsPerBlock.y));
-        cudak_(add_row)<<<numBlocks, threadsPerBlock>>> \
-            (MATRIX_ELEM_PTR(a), MATRIX_ELEM_PTR(b), b->nrow, b->ncol,
-            b->stride / sizeof(MATRIX_ELEM), beta);
-        cudaStreamSynchronize(0);
-    }
-
-    void cudak_(cuda_fill)(Matrix *a, double val) {
-        dim3 threadsPerBlock(CUDA_THREADS_N, CUDA_THREADS_N);
-        dim3 numBlocks(CEIL_DIV(a->ncol, threadsPerBlock.x),
-                CEIL_DIV(a->nrow, threadsPerBlock.y));
-        cudak_(fill)<<<numBlocks, threadsPerBlock>>> \
-            (MATRIX_ELEM_PTR(a), a->nrow, a->ncol,
-            a->stride / sizeof(MATRIX_ELEM), val);
-        cudaStreamSynchronize(0);
-    }
-
-    void cudak_(cuda_expand_frm)(const Matrix *a, Matrix *b, int context) {
-        dim3 threadsPerBlock(CUDA_THREADS_N, CUDA_THREADS_N);
-        dim3 numBlocks(CEIL_DIV(b->ncol, threadsPerBlock.x),
-                CEIL_DIV(b->nrow, threadsPerBlock.y));
-        cudak_(expand_frm)<<<numBlocks, threadsPerBlock>>> \
-            (MATRIX_ELEM_PTR(a), MATRIX_ELEM_PTR(b),
-             a->nrow, a->ncol,
-             b->nrow, b->ncol,
-             a->stride / sizeof(MATRIX_ELEM),
-             b->stride / sizeof(MATRIX_ELEM),
-             context);
-        cudaStreamSynchronize(0);
-    }
-
-    void cudak_(cuda_rearrange_frm)(const Matrix *a, Matrix *b, int step) {
-        dim3 threadsPerBlock(CUDA_THREADS_N, CUDA_THREADS_N);
-        dim3 numBlocks(CEIL_DIV(b->ncol, threadsPerBlock.x),
-                CEIL_DIV(b->nrow, threadsPerBlock.y));
-        cudak_(rearrange_frm)<<<numBlocks, threadsPerBlock>>> \
-            (MATRIX_ELEM_PTR(a), MATRIX_ELEM_PTR(b),
-             b->nrow, b->ncol, b->stride / sizeof(MATRIX_ELEM),
-             step, b->ncol / step);
-        cudaStreamSynchronize(0);
-    }
-
-    void cudak_(cuda_scale_rows_by_col)(const Matrix *a, Matrix *b) {
-        dim3 threadsPerBlock(CUDA_THREADS_N, CUDA_THREADS_N);
-        dim3 numBlocks(CEIL_DIV(b->ncol, threadsPerBlock.x),
-                CEIL_DIV(b->nrow, threadsPerBlock.y));
-        cudak_(scale_rows_by_col)<<<numBlocks, threadsPerBlock>>> \
-            (MATRIX_ELEM_PTR(a), MATRIX_ELEM_PTR(b),
-             b->nrow, b->ncol,
-             a->stride / sizeof(MATRIX_ELEM),
-             b->stride / sizeof(MATRIX_ELEM));
-        cudaStreamSynchronize(0);
-    }
-
-    void cudak_(cuda_scale_rows_by_row)(const Matrix *a, Matrix *b) {
-        dim3 threadsPerBlock(CUDA_THREADS_N, CUDA_THREADS_N);
-        dim3 numBlocks(CEIL_DIV(b->ncol, threadsPerBlock.x),
-                CEIL_DIV(b->nrow, threadsPerBlock.y));
-        cudak_(scale_rows_by_row)<<<numBlocks, threadsPerBlock>>> \
-            (MATRIX_ELEM_PTR(a), MATRIX_ELEM_PTR(b),
-             b->nrow, b->ncol, b->stride / sizeof(MATRIX_ELEM));
-        cudaStreamSynchronize(0);
-    }
-
-    void cudak_(cuda_decompress)(const Matrix *a, Matrix *b) {
-        dim3 threadsPerBlock(1, CUDA_THREADS_NN);
-        dim3 numBlocks(1, CEIL_DIV(a->nrow, threadsPerBlock.y));
-        cudak_(decompress)<<<numBlocks, threadsPerBlock>>> \
-            (MATRIX_ELEM_PTR(a), MATRIX_ELEM_PTR(b),
-             a->nrow, a->ncol,
-             a->stride / sizeof(MATRIX_ELEM),
-             b->stride / sizeof(MATRIX_ELEM));
-        cudaStreamSynchronize(0);
-    }
-}
-#endif
diff --git a/matrix/generic/cumatrix.c b/matrix/generic/cumatrix.c
deleted file mode 100644
index b5d1a35..0000000
--- a/matrix/generic/cumatrix.c
+++ /dev/null
@@ -1,493 +0,0 @@
-#ifdef NERV_GENERIC_CUMATRIX
-#include "matrix.h"
-#include "elem_type.h"
-
-#define MATRIX_DATA_FREE(L, ptr) cuda_matrix_(free)(L, ptr)
-#define MATRIX_DATA_ALLOC(L, dptr, stride, width, height) \
-                            cuda_matrix_(alloc)(L, dptr, stride, width, height)
-#define MATRIX_DATA_WRITE(L, data, idx, val) cuda_matrix_(write)(L, data, idx, val)
-#define MATRIX_DATA_READ(L, data, idx) cuda_matrix_(read)(L, data, idx)
-#define MATRIX_INIT(L) cuda_matrix_(init)(L)
-#define MATRIX_BASE_TNAME nerv_matrix_cuda_tname
-#define NERV_GENERIC_MATRIX
-#define NERV_GENERIC_CUKERNEL
-#include "../../common.h"
-#include "../cukernel.h"
-#include "../cuda_helper.h"
-
-Matrix *nerv_matrix_(new_)(lua_State *L, long nrow, long ncol);
-void nerv_matrix_(data_free)(lua_State *L, Matrix *self);
-
-static void nerv_matrix_(add_)(lua_State *L, const Matrix *a, const Matrix *b,
-                                const Matrix *c,
-                                MATRIX_ELEM alpha, MATRIX_ELEM beta) {
-    PROFILE_START
-    CUBLAS_SAFE_SYNC_CALL(
-            NERV_CUBLAS_(geam)(cublas_handle, CUBLAS_OP_N, CUBLAS_OP_N,
-                a->ncol, a->nrow,
-                &alpha,
-                MATRIX_ELEM_PTR(a), a->stride / sizeof(MATRIX_ELEM),
-                &beta,
-                MATRIX_ELEM_PTR(b), b->stride / sizeof(MATRIX_ELEM),
-                MATRIX_ELEM_PTR(c), c->stride / sizeof(MATRIX_ELEM)));
-    PROFILE_STOP
-}
-
-static int nerv_matrix_(add)(lua_State *L) {
-    Matrix *c = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *a = luaT_checkudata(L, 2, nerv_matrix_(tname));
-    Matrix *b = luaT_checkudata(L, 3, nerv_matrix_(tname));
-    MATRIX_ELEM alpha = luaL_checknumber(L, 4);
-    MATRIX_ELEM beta = luaL_checknumber(L, 5);
-    CHECK_SAME_DIMENSION(a, b);
-    CHECK_SAME_DIMENSION(a, c);
-    nerv_matrix_(add_)(L, a, b, c, alpha, beta);
-    return 0;
-}
-
-static int nerv_matrix_(get_cublas_op)(char ch) {
-    return (ch == 'T' || ch == 't') ? CUBLAS_OP_T : CUBLAS_OP_N;
-}
-
-static int nerv_matrix_(mul)(lua_State *L) {
-#define SWAP(a, b) \
-    do { int t = (a); (a) = (b); (b) = t; } while (0)
-
-    Matrix *c = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *a = luaT_checkudata(L, 2, nerv_matrix_(tname));
-    Matrix *b = luaT_checkudata(L, 3, nerv_matrix_(tname));
-    MATRIX_ELEM alpha = luaL_checknumber(L, 4);
-    MATRIX_ELEM beta = luaL_checknumber(L, 5);
-    int nargs = lua_gettop(L);
-    int ta = nargs > 5 ? nerv_matrix_(get_cublas_op)(*luaL_checkstring(L, 6)) \
-                            : CUBLAS_OP_N;
-    int tb = nargs > 6 ? nerv_matrix_(get_cublas_op)(*luaL_checkstring(L, 7)) \
-                            : CUBLAS_OP_N;
-    int am = a->nrow, an = a->ncol;
-    int bm = b->nrow, bn = b->ncol;
-    if (ta == CUBLAS_OP_T) SWAP(am, an);
-    if (tb == CUBLAS_OP_T) SWAP(bm, bn);
-    if (an != bm)
-        nerv_error(L, "Wrong dimension of multipliers");
-/*    MATRIX_ELEM alpha = 1.0f, beta = 0.0f; */
-    /* Because matrix in Nerv is row-major, here b comes first */
-    PROFILE_START
-    CUBLAS_SAFE_SYNC_CALL(
-            NERV_CUBLAS_(gemm)(cublas_handle, tb, ta,
-                bn, am, bm,
-                &alpha,
-                MATRIX_ELEM_PTR(b), b->stride / sizeof(MATRIX_ELEM),
-                MATRIX_ELEM_PTR(a), a->stride / sizeof(MATRIX_ELEM),
-                &beta,
-                MATRIX_ELEM_PTR(c), c->stride / sizeof(MATRIX_ELEM)));
-    PROFILE_STOP
-    return 0;
-}
-
-static int nerv_matrix_(create)(lua_State *L) {
-    Matrix *a = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *b = nerv_matrix_(new_)(L, a->nrow, a->ncol);
-    luaT_pushudata(L, b, nerv_matrix_(tname));
-    return 1;
-}
-
-static int nerv_matrix_(sigmoid)(lua_State *L) {
-    Matrix *a = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *b = luaT_checkudata(L, 2, nerv_matrix_(tname));
-    CHECK_SAME_DIMENSION(a, b);
-    PROFILE_START
-    cudak_(cuda_sigmoid)(b, a);
-    PROFILE_STOP
-    return 0;
-}
-
-static int nerv_matrix_(sigmoid_grad)(lua_State *L) {
-    Matrix *nerr = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *err = luaT_checkudata(L, 2, nerv_matrix_(tname));
-    Matrix *output = luaT_checkudata(L, 3, nerv_matrix_(tname));
-    CHECK_SAME_DIMENSION(nerr, err);
-    CHECK_SAME_DIMENSION(nerr, output);
-    PROFILE_START
-    cudak_(cuda_sigmoid_grad)(output, err, nerr);
-    PROFILE_STOP
-    return 0;
-}
-
-static int nerv_matrix_(softmax)(lua_State *L) {
-    Matrix *a = luaT_checkudata(L, 2, nerv_matrix_(tname));
-    Matrix *b = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *max, *max_idx;
-    Matrix *dno;
-    CHECK_SAME_DIMENSION(a, b);
-    max = nerv_matrix_(new_)(L, a->nrow, 1);
-    max_idx = nerv_matrix_(new_)(L, a->nrow, 1);
-    dno = nerv_matrix_(new_)(L, a->nrow, 1);
-    PROFILE_START
-    cudak_(cuda_rowmax_idx)(a, max, max_idx);
-    cudak_(cuda_softmax_denominator)(a, max, dno);
-    cudak_(cuda_softmax_final)(a, max, dno, b);
-    PROFILE_STOP
-    nerv_matrix_(data_free)(L, max);
-    nerv_matrix_(data_free)(L, dno);
-    luaT_pushudata(L, max_idx, nerv_matrix_(tname));
-    return 1;
-}
-
-static int nerv_matrix_(rowsum)(lua_State *L) {
-    Matrix *a = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *b = nerv_matrix_(new_)(L, a->nrow, 1);
-    PROFILE_START
-    cudak_(cuda_rowsum)(a, b);
-    PROFILE_STOP
-    luaT_pushudata(L, b, nerv_matrix_(tname));
-    return 1;
-}
-
-static int nerv_matrix_(colsum)(lua_State *L) {
-    Matrix *a = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *b = nerv_matrix_(new_)(L, 1, a->ncol);
-    PROFILE_START
-    cudak_(cuda_colsum)(a, b);
-    PROFILE_STOP
-    luaT_pushudata(L, b, nerv_matrix_(tname));
-    return 1;
-}
-
-static int nerv_matrix_(colsame)(lua_State *L) {
-    Matrix *a = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *ref = luaT_checkudata(L, 2, nerv_matrix_(tname));
-    Matrix *b = nerv_matrix_(new_)(L, 1, a->ncol);
-    CHECK_SAME_DIMENSION(a, ref);
-    PROFILE_START
-    cudak_(cuda_colsame)(a, ref, b);
-    PROFILE_STOP
-    luaT_pushudata(L, b, nerv_matrix_(tname));
-    return 1;
-}
-
-static int nerv_matrix_(rowmax)(lua_State *L) {
-    Matrix *a = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *b = nerv_matrix_(new_)(L, a->nrow, 1);
-    PROFILE_START
-    cudak_(cuda_rowmax)(a, b);
-    PROFILE_STOP
-    luaT_pushudata(L, b, nerv_matrix_(tname));
-    return 1;
-}
-
-static int nerv_matrix_(rowmax_idx)(lua_State *L) {
-    Matrix *a = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *b = nerv_matrix_(new_)(L, a->nrow, 1);
-    Matrix *idx = nerv_matrix_(new_)(L, a->nrow, 1);
-    PROFILE_START
-    cudak_(cuda_rowmax_idx)(a, b, idx);
-    PROFILE_STOP
-    luaT_pushudata(L, b, nerv_matrix_(tname));
-    luaT_pushudata(L, idx, nerv_matrix_(tname));
-    return 2;
-}
-
-static int nerv_matrix_(add_row)(lua_State *L) {
-    Matrix *a = luaT_checkudata(L, 2, nerv_matrix_(tname));
-    Matrix *b = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    double beta = luaL_checknumber(L, 3);
-    if (a->ncol != b->ncol)
-        nerv_error(L, "the number of columns is not the same");
-    if (a->nrow != 1)
-        nerv_error(L, "a row vector is expected");
-    PROFILE_START
-    cudak_(cuda_add_row)(a, b, beta);
-    PROFILE_STOP
-    return 0;
-}
-
-static int nerv_matrix_(fill)(lua_State *L) {
-    Matrix *self = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    double val = luaL_checknumber(L, 2);
-    PROFILE_START
-    cudak_(cuda_fill)(self, val);
-    PROFILE_STOP
-    return 0;
-}
-
-static int nerv_matrix_(copy_fromd)(lua_State *L) {
-    Matrix *a = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *b = luaT_checkudata(L, 2, nerv_matrix_(tname));
-    int nargs = lua_gettop(L);
-    int b_begin = nargs > 2 ? luaL_checkinteger(L, 3) : 0;
-    int b_end = nargs > 3 ? luaL_checkinteger(L, 4) : b->nrow;
-    int a_begin = nargs > 4 ? luaL_checkinteger(L, 5) : 0;
-    if (!(0 <= b_begin && b_begin < b_end && b_end <= b->nrow &&
-            a_begin + b_end - b_begin <= a->nrow))
-        nerv_error(L, "invalid copy interval");
-    if (a->ncol != b->ncol)
-        nerv_error(L, "matrices should be of the same dimension");
-    PROFILE_START
-    CUDA_SAFE_SYNC_CALL(
-            cudaMemcpy2D(MATRIX_ROW_PTR(a, a_begin), a->stride,
-                MATRIX_ROW_PTR(b, b_begin), b->stride,
-                sizeof(MATRIX_ELEM) * b->ncol, b_end - b_begin,
-                cudaMemcpyDeviceToDevice));
-    PROFILE_STOP
-    return 0;
-}
-
-extern const char *MATRIX_CUMATRIX_HOST_TNAME;
-static int nerv_matrix_(copy_fromh)(lua_State *L) { 
-    Matrix *a = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *b = luaT_checkudata(L, 2, MATRIX_CUMATRIX_HOST_TNAME);
-    int nargs = lua_gettop(L);
-    int b_begin = nargs > 2 ? luaL_checkinteger(L, 3) : 0;
-    int b_end = nargs > 3 ? luaL_checkinteger(L, 4) : b->nrow;
-    int a_begin = nargs > 4 ? luaL_checkinteger(L, 5) : 0;
-    if (!(0 <= b_begin && b_begin < b_end && b_end <= b->nrow &&
-            a_begin + b_end - b_begin <= a->nrow))
-        nerv_error(L, "invalid copy interval");
-    if (a->ncol != b->ncol)
-        nerv_error(L, "matrices should be of the same dimension");
-    PROFILE_START
-    CUDA_SAFE_SYNC_CALL(
-            cudaMemcpy2D(MATRIX_ROW_PTR(a, a_begin), a->stride,
-                MATRIX_ROW_PTR(b, b_begin), b->stride,
-                sizeof(MATRIX_ELEM) * b->ncol, b_end - b_begin,
-                cudaMemcpyHostToDevice));
-    PROFILE_STOP
-    return 0;
-}
-
-static int nerv_matrix_(copy_toh)(lua_State *L) {
-    Matrix *a = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *b = luaT_checkudata(L, 2, MATRIX_CUMATRIX_HOST_TNAME);
-    int nargs = lua_gettop(L);
-    int a_begin = nargs > 2 ? luaL_checkinteger(L, 3) : 0;
-    int a_end = nargs > 3 ? luaL_checkinteger(L, 4) : a->nrow;
-    int b_begin = nargs > 4 ? luaL_checkinteger(L, 5) : 0;
-    if (!(0 <= a_begin && a_begin < a_end && a_end <= a->nrow &&
-            b_begin + a_end - a_begin <= b->nrow))
-        nerv_error(L, "invalid copy interval");
-    if (b->ncol != a->ncol)
-        nerv_error(L, "matrices should be of the same dimension");
-    PROFILE_START
-    CUDA_SAFE_SYNC_CALL(
-            cudaMemcpy2D(MATRIX_ROW_PTR(b, b_begin), b->stride,
-                MATRIX_ROW_PTR(a, a_begin), a->stride,
-                sizeof(MATRIX_ELEM) * a->ncol, a_end - a_begin,
-                cudaMemcpyDeviceToHost));
-    PROFILE_STOP
-    return 0;
-}
-
-static int nerv_matrix_(trans)(lua_State *L) {
-    Matrix *a = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *b = nerv_matrix_(new_)(L, a->ncol, a->nrow);
-    MATRIX_ELEM alpha = 1, beta = 0;
-    /* FIXME: possible memory leak when lua error is raised */
-    PROFILE_START
-    CUBLAS_SAFE_SYNC_CALL(
-            NERV_CUBLAS_(geam)(cublas_handle, CUBLAS_OP_T, CUBLAS_OP_T,
-                a->nrow, a->ncol,
-                &alpha,
-                MATRIX_ELEM_PTR(a), a->stride / sizeof(MATRIX_ELEM),
-                &beta,
-                MATRIX_ELEM_PTR(a), a->stride / sizeof(MATRIX_ELEM),
-                MATRIX_ELEM_PTR(b), b->stride / sizeof(MATRIX_ELEM)));
-    PROFILE_STOP
-    luaT_pushudata(L, b, nerv_matrix_(tname));
-    return 1;
-}
-
-static int nerv_matrix_(mul_elem)(lua_State *L) {
-    Matrix *a = luaT_checkudata(L, 2, nerv_matrix_(tname));
-    Matrix *b = luaT_checkudata(L, 3, nerv_matrix_(tname));
-    Matrix *c = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    CHECK_SAME_DIMENSION(a, b);
-    CHECK_SAME_DIMENSION(a, c);
-    PROFILE_START
-    cudak_(cuda_mul_elem)(a, b, c);
-    PROFILE_STOP
-    return 0;
-}
-
-static int nerv_matrix_(log_elem)(lua_State *L) {
-    Matrix *a = luaT_checkudata(L, 2, nerv_matrix_(tname));
-    Matrix *b = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    CHECK_SAME_DIMENSION(a, b);
-    PROFILE_START
-    cudak_(cuda_log_elem)(a, b);
-    PROFILE_STOP
-    return 0;
-}
-
-static int nerv_matrix_(decompress)(lua_State *L) {
-    Matrix *a = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *b;
-    int orig_col = luaL_checkinteger(L, 2);
-    if (a->ncol != 1)
-        nerv_error(L, "the compressed matrix must be a column vector");
-    b = nerv_matrix_(new_)(L, a->nrow, orig_col);
-    PROFILE_START
-    cudak_(cuda_fill)(b, 0.0);
-    cudak_(cuda_decompress)(a, b);
-    PROFILE_STOP
-    luaT_pushudata(L, b, nerv_matrix_(tname));
-    return 1;
-}
-
-extern const char *nerv_matrix_host_int_tname;
-static int nerv_matrix_(copy_rows_fromh_by_idx)(lua_State *L) {
-    Matrix *a = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *b = luaT_checkudata(L, 2, MATRIX_CUMATRIX_HOST_TNAME);
-    Matrix *idx = luaT_checkudata(L, 3, nerv_matrix_host_int_tname);
-    long nrow = a->nrow;
-    int b_begin = lua_gettop(L) > 3 ? luaL_checkinteger(L, 4) : 0;
-    if (!(0 <= b_begin && b_begin + nrow <= idx->ncol))
-        nerv_error(L, "invalid copy interval");
-    long *idx_ptr = idx->data.i;
-    int i;
-    if (idx->nrow != 1)
-        nerv_error(L, "index should be a vector");
-    if (a->ncol != b->ncol)
-        nerv_error(L, "source/destination dimension mismatch");
-    cudaStream_t *streams = (cudaStream_t*)malloc(sizeof(cudaStream_t) * nrow);
-    for (i = 0; i < nrow; i++)
-    {
-        int src_row = idx_ptr[b_begin + i];
-        if (!(0 <= src_row && src_row < b->nrow))
-            nerv_error(L, "invalid index");
-        CUDA_SAFE_CALL(cudaStreamCreate(streams + i));
-        CUDA_SAFE_CALL(cudaMemcpyAsync(MATRIX_ROW_PTR(a, i),
-                    MATRIX_ROW_PTR(b, src_row),
-                    b->stride,
-                    cudaMemcpyHostToDevice, streams[i]));
-    }
-    for (i = 0; i < nrow; i++)
-    {
-        CUDA_SAFE_CALL(cudaStreamSynchronize(streams[i]));
-        CUDA_SAFE_CALL(cudaStreamDestroy(streams[i]));
-    }
-    free(streams);
-    return 0;
-}
-
-static int nerv_matrix_(expand_frm)(lua_State *L) {
-    Matrix *a = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *b = luaT_checkudata(L, 2, nerv_matrix_(tname));
-    int context = luaL_checkinteger(L, 3);
-    if (a->nrow != b->nrow)
-        nerv_error(L, "mismatching number of frames");
-    if (a->ncol != b->ncol * (context * 2 + 1))
-        nerv_error(L, "the width should be 2 * context + 1");
-    PROFILE_START
-    cudak_(cuda_expand_frm)(b, a, context);
-    PROFILE_STOP
-    return 0;
-}
-
-static int nerv_matrix_(rearrange_frm)(lua_State *L) {
-    Matrix *a = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *b = luaT_checkudata(L, 2, nerv_matrix_(tname));
-    int step = luaL_checkinteger(L, 3);
-    CHECK_SAME_DIMENSION(a, b);
-    if (b->ncol % step)
-        nerv_error(L, "the dimension of columns is not divisible by step");
-    PROFILE_START
-    cudak_(cuda_rearrange_frm)(b, a, step);
-    PROFILE_STOP
-    return 0;
-}
-
-static int nerv_matrix_(scale_rows_by_col)(lua_State *L) {
-    Matrix *a = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *b = luaT_checkudata(L, 2, nerv_matrix_(tname));
-    if (a->nrow != b->nrow)
-        nerv_error(L, "the number of rows is not the same");
-    if (b->ncol != 1)
-        nerv_error(L, "a column vector is expected");
-    PROFILE_START
-    cudak_(cuda_scale_rows_by_col)(b, a);
-    PROFILE_STOP
-    return 0;
-}
-
-static int nerv_matrix_(scale_rows_by_row)(lua_State *L) {
-    Matrix *a = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *b = luaT_checkudata(L, 2, nerv_matrix_(tname));
-    if (a->ncol != b->ncol)
-        nerv_error(L, "the number of columns is not the same");
-    if (b->nrow != 1)
-        nerv_error(L, "a row vector is expected");
-    PROFILE_START
-    cudak_(cuda_scale_rows_by_row)(b, a);
-    PROFILE_STOP
-    return 0;
-}
-
-static const luaL_Reg nerv_matrix_(extra_methods)[] = {
-    {"create", nerv_matrix_(create)},
-    {"colsum", nerv_matrix_(colsum)},
-    {"colsame", nerv_matrix_(colsame)},
-    {"rowsum", nerv_matrix_(rowsum)},
-    {"rowmax", nerv_matrix_(rowmax)},
-    {"rowmax_idx", nerv_matrix_(rowmax_idx)},
-    {"trans", nerv_matrix_(trans)},
-    {"decompress", nerv_matrix_(decompress)},
-    /* in-place calc */
-    {"copy_fromh", nerv_matrix_(copy_fromh)},
-    {"copy_fromd", nerv_matrix_(copy_fromd)},
-    {"copy_toh", nerv_matrix_(copy_toh)},
-    {"add", nerv_matrix_(add)},
-    {"mul", nerv_matrix_(mul)},
-    {"add_row", nerv_matrix_(add_row)},
-    {"fill", nerv_matrix_(fill)},
-    {"sigmoid", nerv_matrix_(sigmoid)},
-    {"sigmoid_grad", nerv_matrix_(sigmoid_grad)},
-    {"softmax", nerv_matrix_(softmax)},
-    {"mul_elem", nerv_matrix_(mul_elem)},
-    {"log_elem", nerv_matrix_(log_elem)},
-    {"copy_rows_fromh_by_idx", nerv_matrix_(copy_rows_fromh_by_idx)},
-    {"expand_frm", nerv_matrix_(expand_frm)},
-    {"rearrange_frm", nerv_matrix_(rearrange_frm)},
-    {"scale_rows_by_row", nerv_matrix_(scale_rows_by_row)},
-    {"scale_rows_by_col", nerv_matrix_(scale_rows_by_col)},
-    {NULL, NULL}
-};
-
-static void cuda_matrix_(init)(lua_State *L) {
-    luaN_append_methods(L, nerv_matrix_(extra_methods));
-}
-
-static void cuda_matrix_(free)(lua_State *L, MATRIX_ELEM *ptr) {
-    CUDA_SAFE_SYNC_CALL(cudaFree(ptr));
-}
-
-static void cuda_matrix_(alloc)(lua_State *L, MATRIX_ELEM **dptr,
-                                size_t *stride, long width, long height) {
-    PROFILE_START
-    CUDA_SAFE_SYNC_CALL(cudaMallocPitch((void **)dptr, stride, width, height));
-    PROFILE_STOP
-}
-
-static MATRIX_ELEM cuda_matrix_(read)(lua_State *L, MATRIX_ELEM *data,
-                                        int idx) {
-    MATRIX_ELEM res;
-    CUDA_SAFE_SYNC_CALL(cudaMemcpy(&res, data + idx,
-                sizeof(MATRIX_ELEM), cudaMemcpyDeviceToHost));
-    return res;
-}
-
-static void cuda_matrix_(write)(lua_State *L, MATRIX_ELEM *data,
-                                int idx, MATRIX_ELEM val) {
-    CUDA_SAFE_SYNC_CALL(cudaMemcpy(data + idx, &val,
-                sizeof(MATRIX_ELEM), cudaMemcpyHostToDevice));
-}
-
-int nerv_matrix_(get_elem)(lua_State *L) {
-    return nerv_error_method_not_implemented(L);
-}
-
-int nerv_matrix_(set_elem)(lua_State *L) {
-    return nerv_error_method_not_implemented(L);
-}
-
-#include "matrix.c"
-#endif
diff --git a/matrix/generic/elem_type.h b/matrix/generic/elem_type.h
deleted file mode 100644
index bffe940..0000000
--- a/matrix/generic/elem_type.h
+++ /dev/null
@@ -1,22 +0,0 @@
-#ifdef MATRIX_USE_FLOAT
-
-#define MATRIX_ELEM float
-#define MATRIX_ELEM_FMT "%f"
-#define MATRIX_ELEM_WRITE_FMT "%.8f"
-#define MATRIX_ELEM_PTR(self) ((self)->data.f)
-
-#elif defined(MATRIX_USE_DOUBLE)
-
-#define MATRIX_ELEM double
-#define MATRIX_ELEM_FMT "%lf"
-#define MATRIX_ELEM_WRITE_FMT "%.8lf"
-#define MATRIX_ELEM_PTR(self) ((self)->data.d)
-
-#elif defined(MATRIX_USE_INT)
-
-#define MATRIX_ELEM long
-#define MATRIX_ELEM_FMT "%ld"
-#define MATRIX_ELEM_WRITE_FMT "%ld"
-#define MATRIX_ELEM_PTR(self) ((self)->data.i)
-
-#endif
diff --git a/matrix/generic/matrix.c b/matrix/generic/matrix.c
deleted file mode 100644
index e17fb42..0000000
--- a/matrix/generic/matrix.c
+++ /dev/null
@@ -1,155 +0,0 @@
-#ifdef NERV_GENERIC_MATRIX
-#include "../../common.h"
-#include "matrix.h"
-
-extern const char *nerv_matrix_(tname);
-extern const char *MATRIX_BASE_TNAME;
-
-void nerv_matrix_(data_free)(lua_State *L, Matrix *self) {
-    (void)L;
-    assert(*self->data_ref > 0);
-    if (--(*self->data_ref) == 0)
-    {
-        /* free matrix data */
-        MATRIX_DATA_FREE(L, MATRIX_ELEM_PTR(self));
-        free(self->data_ref);
-        free(self);
-    }
-}
-
-void nerv_matrix_(data_retain)(Matrix *self) {
-    (*self->data_ref)++;
-}
-
-Matrix *nerv_matrix_(new_)(lua_State *L, long nrow, long ncol) {
-    Matrix *self = (Matrix *)malloc(sizeof(Matrix));
-    self->nrow = nrow;
-    self->ncol = ncol;
-    self->nmax = self->nrow * self->ncol;
-    MATRIX_DATA_ALLOC(L, &MATRIX_ELEM_PTR(self), &self->stride,
-                        sizeof(MATRIX_ELEM) * self->ncol, self->nrow);
-    self->data_ref = (long *)malloc(sizeof(long));
-    *self->data_ref = 0;
-    nerv_matrix_(data_retain)(self);
-    return self;
-}
-
-int nerv_matrix_(new)(lua_State *L) {
-    luaT_pushudata(L, nerv_matrix_(new_)(L, luaL_checkinteger(L, 1),
-                                        luaL_checkinteger(L, 2)),
-                    nerv_matrix_(tname));
-    return 1;
-}
-
-int nerv_matrix_(destroy)(lua_State *L) {
-    Matrix *self = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    nerv_matrix_(data_free)(L, self);
-    return 1;
-}
-
-int nerv_matrix_(get_elem)(lua_State *L); 
-int nerv_matrix_(set_elem)(lua_State *L);
-
-static Matrix *nerv_matrix_(getrow)(Matrix *self, int row) {
-    Matrix *prow = (Matrix *)malloc(sizeof(Matrix));
-    prow->ncol = self->ncol;
-    prow->nrow = 1;
-    prow->stride = self->stride;
-    prow->nmax = prow->ncol;
-    MATRIX_ELEM_PTR(prow) = MATRIX_ROW_PTR(self, row);
-    prow->data_ref = self->data_ref;
-    nerv_matrix_(data_retain)(prow);
-    return prow;
-}
-
-static int nerv_matrix_(newindex)(lua_State *L) {
-    Matrix *self = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    if (lua_isnumber(L, 2))
-    {
-        int idx = luaL_checkinteger(L, 2);
-        if (self->nrow == 1)
-        {
-            if (idx < 0 || idx >= self->ncol)
-                nerv_error(L, "index must be within range [0, %d)", self->ncol);
-            MATRIX_DATA_WRITE(L, MATRIX_ELEM_PTR(self), idx,
-                                luaL_checknumber(L, 3));
-        }
-        else
-            nerv_error(L, "cannot assign to row vector");
-        lua_pushboolean(L, 1);
-        return 1;
-    }
-    else
-    {
-        lua_pushboolean(L, 0);
-        return 1;
-    }
-}
-
-
-static int nerv_matrix_(index)(lua_State *L) {
-    Matrix *self = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    if (lua_isnumber(L, 2))
-    {
-        int idx = luaL_checkinteger(L, 2);
-        if (self->nrow == 1)
-        {
-            if (idx < 0 || idx >= self->ncol)
-                nerv_error(L, "index must be within range [0, %d)", self->ncol);
-            lua_pushnumber(L, MATRIX_DATA_READ(L, MATRIX_ELEM_PTR(self), idx));
-        }
-        else
-        {
-            if (idx < 0 || idx >= self->nrow)
-                nerv_error(L, "index must be within range [0, %d)", self->nrow);
-            luaT_pushudata(L, nerv_matrix_(getrow)(self, idx), nerv_matrix_(tname));
-        }
-        lua_pushboolean(L, 1);
-        return 2;
-    }
-    else
-    {
-        lua_pushboolean(L, 0);
-        return 1;
-    }
-}
-
-static int nerv_matrix_(ncol)(lua_State *L) {
-    Matrix *self = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    lua_pushinteger(L, self->ncol);
-    return 1;
-}
-
-static int nerv_matrix_(nrow)(lua_State *L) {
-    Matrix *self = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    lua_pushinteger(L, self->nrow);
-    return 1;
-}
-
-static int nerv_matrix_(get_dataref_value)(lua_State *L) {                                                                                                                                               
-    Matrix *self = luaT_checkudata(L, 1, nerv_matrix_(tname));                                                                                                                                           
-    lua_pushinteger(L, *(self->data_ref));                                                                                                                                                               
-    return 1;                                                                                                                                                                                            
-}      
-
-static const luaL_Reg nerv_matrix_(methods)[] = {
-    {"get_elem", nerv_matrix_(get_elem)},
-    {"set_elem", nerv_matrix_(set_elem)},
-    {"ncol", nerv_matrix_(ncol)},
-    {"nrow", nerv_matrix_(nrow)},
-    {"get_dataref_value", nerv_matrix_(get_dataref_value)},
-    {"__index__", nerv_matrix_(index)},
-    {"__newindex__", nerv_matrix_(newindex)},
-    {NULL, NULL}
-};
-
-void nerv_matrix_(init)(lua_State *L) {
-    luaT_newmetatable(L, nerv_matrix_(tname), MATRIX_BASE_TNAME,
-                        nerv_matrix_(new), nerv_matrix_(destroy), NULL);
-    luaL_register(L, NULL, nerv_matrix_(methods));
-#ifdef MATRIX_INIT
-    MATRIX_INIT(L);
-#endif
-    lua_pop(L, 1);
-}
-#endif
diff --git a/matrix/generic/matrix.h b/matrix/generic/matrix.h
deleted file mode 100644
index 833724b..0000000
--- a/matrix/generic/matrix.h
+++ /dev/null
@@ -1,19 +0,0 @@
-#ifndef NERV_GENERIC_MATRIX_H
-#define NERV_GENERIC_MATRIX_H
-
-#include <stddef.h>
-typedef struct Matrix {
-    size_t stride;              /* size of a row */
-    long ncol, nrow, nmax;    /* dimension of the matrix */
-    union {
-        float *f;
-        double *d;
-        long *i;
-    } data;                   /* pointer to actual storage */
-    long *data_ref;
-} Matrix;
-
-#define MATRIX_ROW_PTR(self, row) \
-    (MATRIX_ELEM *)((char *)MATRIX_ELEM_PTR(self) + (row) * (self)->stride)
-
-#endif
diff --git a/matrix/generic/mmatrix.c b/matrix/generic/mmatrix.c
deleted file mode 100644
index b0f0791..0000000
--- a/matrix/generic/mmatrix.c
+++ /dev/null
@@ -1,122 +0,0 @@
-#ifdef NERV_GENERIC_MMATRIX
-#include "matrix.h"
-#include "elem_type.h"
-#define MATRIX_DATA_FREE(L, ptr) free(ptr)
-#define MATRIX_DATA_ALLOC(L, dptr, stride, width, height) \
-                            host_matrix_(alloc)(L, dptr, stride, width, height)
-#define MATRIX_DATA_WRITE(L, data, idx, val) (data[idx] = val)
-#define MATRIX_DATA_READ(L, data, idx) (data[idx])
-#define MATRIX_INIT(L) host_matrix_(init)(L)
-#define MATRIX_BASE_TNAME nerv_matrix_host_tname
-#define NERV_GENERIC_MATRIX
-#include "../../common.h"
-#include "../../io/chunk_file.h"
-#include "string.h"
-
-static void host_matrix_(alloc)(lua_State *L,
-                                MATRIX_ELEM **dptr, size_t *stride,
-                                long width, long height) {
-    if ((*dptr = (MATRIX_ELEM *)malloc(width * height)) == NULL)
-        nerv_error(L, "mmatrix insufficient memory");
-    *stride = width;
-}
-
-int nerv_matrix_(get_elem)(lua_State *L) {
-    Matrix *self = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    int idx = luaL_checkinteger(L, 2);
-    if (idx < 0 || idx >= self->nmax)
-        nerv_error(L, "index must be within range [0, %d)", self->nmax);
-    lua_pushnumber(L, MATRIX_ELEM_PTR(self)[idx]);
-    return 1;
-}
-
-int nerv_matrix_(set_elem)(lua_State *L) {
-    Matrix *self = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    int idx = luaL_checkinteger(L, 2);
-    MATRIX_ELEM v = luaL_checknumber(L, 3);
-    if (idx < 0 || idx >= self->nmax)
-        nerv_error(L, "index must be within range [0, %d)", self->nmax);
-    MATRIX_ELEM_PTR(self)[idx] = v;
-    return 0;
-}
-
-static const luaL_Reg nerv_matrix_(extra_methods)[];
-static void host_matrix_(init)(lua_State *L) {
-    luaN_append_methods(L, nerv_matrix_(extra_methods));
-#ifdef MMATRIX_INIT
-    MMATRIX_INIT(L);
-#endif
-}
-
-#include "matrix.c"
-
-int nerv_matrix_(load)(lua_State *L) {
-    ChunkData *chunk = luaT_checkudata(L, 1, nerv_chunk_data_tname);
-    Matrix *self;
-    int i, j;
-    long nrow, ncol;
-    FILE *fp = chunk->fp;
-    if (fscanf(fp, "%ld %ld", &nrow, &ncol) != 2)
-        return 0;
-    self = nerv_matrix_(new_)(L, nrow, ncol);
-    for (i = 0; i < nrow; i++)
-    {
-        MATRIX_ELEM *row = MATRIX_ROW_PTR(self, i);
-        for (j = 0; j < ncol; j++)
-            if (fscanf(fp, MATRIX_ELEM_FMT, row + j) != 1)
-            {
-                free(self);
-                return 0;
-            }
-    }
-    luaT_pushudata(L, self, nerv_matrix_(tname));
-    return 1;
-}
-
-int nerv_matrix_(save)(lua_State *L) {
-    ChunkFileHandle *chunk = luaT_checkudata(L, 2,
-                                nerv_chunk_file_handle_tname);
-    Matrix *self = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    int i, j;
-    long nrow = self->nrow, ncol = self->ncol;
-    FILE *fp = chunk->fp;
-    if (fprintf(fp, "%ld %ld\n", nrow, ncol) < 0)
-        return 0;
-    for (i = 0; i < nrow; i++)
-    {
-        MATRIX_ELEM *row = MATRIX_ROW_PTR(self, i);
-        for (j = 0; j < ncol; j++)
-            if (fprintf(fp, MATRIX_ELEM_WRITE_FMT " ", row[j]) < 0)
-                return 0;
-        if (fprintf(fp, "\n") < 0)
-             return 0;
-    }
-    return 0;
-}
-
-static int nerv_matrix_(copy_from)(lua_State *L) {
-    Matrix *a = luaT_checkudata(L, 1, nerv_matrix_(tname));
-    Matrix *b = luaT_checkudata(L, 2, nerv_matrix_(tname));
-    int nargs = lua_gettop(L);
-    int b_begin = nargs > 2 ? luaL_checkinteger(L, 3) : 0;
-    int b_end = nargs > 3 ? luaL_checkinteger(L, 4) : b->nrow;
-    int a_begin = nargs > 4 ? luaL_checkinteger(L, 5) : 0;
-    if (!(0 <= b_begin && b_begin < b_end && b_end <= b->nrow &&
-            a_begin + b_end - b_begin <= a->nrow))
-        nerv_error(L, "invalid copy interval");
-    if (a->ncol != b->ncol)
-        nerv_error(L, "matrices should be of the same dimension");
-    memmove(MATRIX_ROW_PTR(a, a_begin),
-            MATRIX_ROW_PTR(b, b_begin),
-            sizeof(MATRIX_ELEM) * b->ncol * (b_end - b_begin));
-    return 0;
-}
-
-static const luaL_Reg nerv_matrix_(extra_methods)[] = {
-    {"load", nerv_matrix_(load)},
-    {"save", nerv_matrix_(save)},
-    {"copy_from", nerv_matrix_(copy_from)},
-    {NULL, NULL}
-};
-
-#endif