Function convert_csr_sparse_matrix

src/memory/utils/mod.rs:468–484

Convert CSR sparse matrix between numeric types. Transforms a Compressed Sparse Row matrix from one numeric type to another while preserving the sparse structure. Particularly useful for converting integer count data to floating-point for analysis. ## Parameters `matrix` - Source CSR matrix to convert ## Type Parameters `T` - Source numeric type (e.g., i32, u32) `U` - Target floating-point type

(matrix: CsrMatrix<T>)

/// - **Matrix dimensions**: Rows and columns preserved
/// - **Memory efficiency**: No unnecessary densification
fn convert_csr_sparse_matrix<T, U>(matrix: CsrMatrix<T>) -> anyhow::Result<CsrMatrix<U>>
where
    T: NumericOps + NumCast + Copy, // Base numeric traits for source
    U: NumericOps + NumCast + Copy + Float, // Ensure target is float (f32/f64)
{
    let nrows = matrix.nrows();
    let ncols = matrix.ncols();
    let (row_offsets, col_indices, values) = matrix.disassemble();

    let new_values: Vec<U> = values
        .into_iter()
        .map(|x| NumCast::from(x).unwrap())
        .collect();

    CsrMatrix::try_from_csr_data(nrows, ncols, row_offsets, col_indices, new_values)
        .map_err(|e| anyhow::anyhow!("Failed to create CSR matrix: {}", e))
}

/// Convert CSC sparse matrix between numeric types.
///