Phase4.py 文件源码

def newUserSim(data_matrix):
    n = np.shape(data_matrix)[0]  # ?userNum
    userSimArr = np.zeros(shape=(n, n))  # ???????????????,???
    userCommon = np.zeros(shape=(n, n))  # ???????

    for i in range(n):
        for j in range(i+1, n):
            overLap = np.nonzero(np.logical_and(data_matrix[i, :]>0, data_matrix[j, :]>0))[0]
            if len(overLap) > 1:
                sim = computeSim(data_matrix[i, overLap], data_matrix[j, overLap])
            else:
                sim = 0
            userSimArr[i][j] = sim
            userSimArr[j][i] = sim
            userCommon[i][j] = len(overLap)
            userCommon[j][i] = len(overLap)

    coef = np.exp((userCommon * 1.0 / userCommon.max(axis=0)) - 1)
    newUserSim = coef * userSimArr  # ????,????????????????
    newUserSim = np.nan_to_num(newUserSim)  # ????????,????
    return newUserSim, userCommon


# ????????????