import java.util.*;
import java.io.*;

class Main {

    public static long comput(int[] tmp) {
        long res = 0;
        int n = tmp.length;
        Arrays.sort(tmp);
        for (int i = 0; i < tmp.length; i++) res += Math.abs(tmp[i] - tmp[n / 2]);
        return res;
    }

    public static long comput1(Set<Long> set, int[][] a) throws Exception {
        long res = 0;
        List<Integer> list = new ArrayList<>();
        for (Long num: set) {
            int y = (int)(num << 32 >> 32);
            int x = (int)(num >> 32);
            list.add(a[x][y]);
        }
        Collections.sort(list);
        int n = list.size();
        for (int i = 0; i < n; i++) res += Math.abs(list.get(i) - list.get(n / 2));

        return res;

    }

    static BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    static BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out));

    public static void main(String[] args) throws Exception{
        // Scanner sc = new Scanner(System.in);

        int T = Integer.parseInt(in.readLine());
        while (T-- > 0) {
            String[] line = in.readLine().split(" ");
            int n = Integer.parseInt(line[0]);
            int m = Integer.parseInt(line[1]);
            int[][] a = new int[n][m];
            for (int i = 0; i < n; i++) {
                line = in.readLine().split(" ");
                for (int j = 0; j < m; j++) {
                    a[i][j] = Integer.parseInt(line[j]);
                }
            }
            long res = 0;
            for (int i = 0; i <=  n - 1 - i; i++) {
                for (int j = 0; j <= m - 1 - j; j++) {
                    Set<Long> set = new HashSet<>();
                    set.add(((long)i<<32) + j);
                    set.add(((long)(n - 1 - i)<<32) + j);
                    set.add(((long)(n - 1 - i)<<32) + m - 1 - j);
                    set.add(((long)i<<32) + m - 1 - j);
                    res += comput1(set, a);

                }
            }
            out.write(res+"\n");

        }
        out.flush();
    }
}