请教一下ROIrotate部分的代码

[Fighting-JJ]

不是很明白下面这个函数的作用，可以简单讲解一下吗？
def param2theta(param, w, h):
param = np.vstack([param, [0, 0, 1]])
param = np.linalg.inv(param)

    theta = np.zeros([2, 3])
    theta[0, 0] = param[0, 0]
    theta[0, 1] = param[0, 1] * h / w
    theta[0, 2] = param[0, 2] * 2 / w + theta[0, 0] + theta[0, 1] - 1
    theta[1, 0] = param[1, 0] * w / h
    theta[1, 1] = param[1, 1]
    theta[1, 2] = param[1, 2] * 2 / h + theta[1, 0] + theta[1, 1] - 1
    return theta

[jiangxiluning]

@Fighting-JJ please refer to https://discuss.pytorch.org/t/affine-transformation-matrix-paramters-conversion/19522/13

[Fighting-JJ]

@Fighting-JJ please refer to https://discuss.pytorch.org/t/affine-transformation-matrix-paramters-conversion/19522/13

Thanks a lot.