将浮点数数组的数组转换为UnsafeMutablePointer<UnsafeMutablePointer<Float>>

// 创建浮点数数组的数组
let floatArrays: [[Float]] = [[1.0, 2.0, 3.0], [4.0, 5.0, 6.0], [7.0, 8.0, 9.0]]

// 创建指向浮点数的指针
let floatPointer = UnsafeMutablePointer<Float>.allocate(capacity: floatArrays[0].count)

// 创建指向浮点数指针的指针
let pointerPointer = UnsafeMutablePointer<UnsafeMutablePointer<Float>>.allocate(capacity: floatArrays.count)

// 将浮点数数组的第一个元素的地址赋值给指针变量
floatPointer.initialize(to: floatArrays[0][0])

// 将指向浮点数指针的指针变量赋值为指针变量
pointerPointer.initialize(to: floatPointer)

// 遍历浮点数数组的剩余元素，重复赋值操作
for i in 1..<floatArrays.count {
    let floatPointer = UnsafeMutablePointer<Float>.allocate(capacity: floatArrays[i].count)
    floatPointer.initialize(to: floatArrays[i][0])
    pointerPointer.advanced(by: i).initialize(to: floatPointer)
}

// 将指向浮点数指针的指针变量返回
let result = pointerPointer

// 使用完指针后，释放内存空间
for i in 0..<floatArrays.count {
    pointerPointer.advanced(by: i).deinitialize(count: floatArrays[i].count)
    pointerPointer.advanced(by: i).deallocate()
}
pointerPointer.deallocate()