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#pragma once
#include <neuralnet/types.h>
#include <assert.h>
/// NxM matrix.
typedef struct nnMatrix {
int rows;
int cols;
R* values;
} nnMatrix;
/// Construct a matrix.
nnMatrix nnMatrixMake(int rows, int cols);
/// Delete a matrix and free its internal memory.
void nnMatrixDel(nnMatrix*);
/// Move a matrix.
///
/// |in| is an empty matrix after the move.
/// |out| is a matrix like |in| before the move.
void nnMatrixMove(nnMatrix* in, nnMatrix* out);
/// Deep-copy a matrix.
void nnMatrixCopy(const nnMatrix* in, nnMatrix* out);
/// Write the matrix values into an array in a row-major fashion.
void nnMatrixToArray(const nnMatrix* in, R* out);
/// Write the given row of a matrix into an array.
void nnMatrixRowToArray(const nnMatrix* in, int row, R* out);
/// Copy a column from a source to a target matrix.
void nnMatrixCopyCol(const nnMatrix* in, nnMatrix* out, int col_in, int col_out);
/// Mutable borrow of a matrix.
nnMatrix nnMatrixBorrow(nnMatrix* in);
/// Mutable borrow of a subrange of rows of a matrix.
nnMatrix nnMatrixBorrowRows(nnMatrix* in, int row_start, int num_rows);
/// Initialize the matrix from an array of values.
///
/// The array must hold values in a row-major fashion.
void nnMatrixInit(nnMatrix*, const R* values);
/// Initialize all matrix values to a given constant.
void nnMatrixInitConstant(nnMatrix*, R value);
/// Multiply two matrices.
void nnMatrixMul(const nnMatrix* left, const nnMatrix* right, nnMatrix* out);
/// Matrix multiply-add.
///
/// out = left + (right * scale)
void nnMatrixMulAdd(const nnMatrix* left, const nnMatrix* right, R scale, nnMatrix* out);
/// Matrix multiply-subtract.
///
/// out = left - (right * scale)
void nnMatrixMulSub(const nnMatrix* left, const nnMatrix* right, R scale, nnMatrix* out);
/// Hadamard product of two matrices.
void nnMatrixMulPairs(const nnMatrix* left, const nnMatrix* right, nnMatrix* out);
/// Add two matrices.
void nnMatrixAdd(const nnMatrix* left, const nnMatrix* right, nnMatrix* out);
/// Subtract two matrices.
void nnMatrixSub(const nnMatrix* left, const nnMatrix* right, nnMatrix* out);
/// Adds a row vector to all rows of the matrix.
void nnMatrixAddRow(const nnMatrix* matrix, const nnMatrix* row, nnMatrix* out);
/// Scale a matrix.
void nnMatrixScale(nnMatrix*, R scale);
/// Transpose a matrix.
/// |in| must be different than |out|.
void nnMatrixTranspose(const nnMatrix* in, nnMatrix* out);
/// Threshold the values of a matrix using a greater-than operator.
///
/// out[x,y] = 1 if in[x,y] > threshold else 0
void nnMatrixGt(const nnMatrix* in, R threshold, nnMatrix* out);
/// Return the matrix value at the given row and column.
static inline R nnMatrixAt(const nnMatrix* matrix, int row, int col) {
assert(matrix);
return matrix->values[row * matrix->cols + col];
}
/// Set the matrix value at the given row and column.
static inline void nnMatrixSet(nnMatrix* matrix, int row, int col, R value) {
assert(matrix);
matrix->values[row * matrix->cols + col] = value;
}
/// Return a pointer to the given row in the matrix.
static inline const R* nnMatrixRow(const nnMatrix* matrix, int row) {
assert(matrix);
return &matrix->values[row * matrix->cols];
}
/// Return a mutable pointer to the given row in the matrix.
static inline R* nnMatrixRow_mut(nnMatrix* matrix, int row) {
assert(matrix);
return &matrix->values[row * matrix->cols];
}
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