def my_det(X):
    '''
    Parameters
    ----------
    X : array_like

    Returns
    -------
    det : float
        Determinant of `a`.
    '''
    if(len(X)!=len(X[0])):
        return 0
    change = 0
    det = 1
    for i in range(len(X)):
        j=i
        while X[i][j] == 0:
            j+=1
            if j>=len(X):
                return 0
        if i!=j:
            for k in range(len(X)):
                X[i][k], X[j][k]=X[j][k], X[i][k]
            change+=1
        j+=1
        while(j!=len(X)):
            for k in range(len(X)):
                X[j][k]-=X[i][k]*(X[j][i]/X[i][i])
            j+=1
    for i in range(len(X)):
        det *= X[i][i]
    if(change % 2 == 1):
        det*=-1
    return det