#!/usr/bin/python3
# -*- coding: utf-8 -*-
import numpy as np
import torch


def anti_wrapping_function(x):

    return torch.abs(x - torch.round(x / (2 * np.pi)) * 2 * np.pi)


def phase_losses(phase_r, phase_g):

    ip_loss = torch.mean(anti_wrapping_function(phase_r - phase_g))
    gd_loss = torch.mean(anti_wrapping_function(torch.diff(phase_r, dim=1) - torch.diff(phase_g, dim=1)))
    iaf_loss = torch.mean(anti_wrapping_function(torch.diff(phase_r, dim=2) - torch.diff(phase_g, dim=2)))

    return ip_loss, gd_loss, iaf_loss


if __name__ == '__main__':
    pass