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第4讲:从零开始Python实现空间马尔科夫链

  • 2026-06-30 22:00:21
第4讲:从零开始Python实现空间马尔科夫链

第4讲:从零开始Python实现空间马尔科夫链

4.1 完整代码实现

import numpy as npimport pandas as pdimport matplotlib.pyplot as pltclass SpatialMarkovChain:    """    空间马尔科夫链 - 从零实现    参数:    -----    k : int, 状态数量(分位数个数),默认为4    """    def __init__(self, k=4):        self.k = k        self.global_tpm = None        # 全局转移概率矩阵        self.spatial_tpms = None      # 空间条件转移概率矩阵        self.transitions = None       # 全局转移计数矩阵        self.spatial_transitions = None  # 空间条件转移计数矩阵        self.classes = None           # 分位数边界    def _create_weight_matrix(self, n_rows, n_cols, contiguity='rook'):        """        为规则网格创建空间权重矩阵        参数:        -----        n_rows, n_cols : 网格的行数和列数        contiguity : 'rook' 或 'queen'        返回:        -----        W : 行标准化的空间权重矩阵        """        n = n_rows * n_cols        W = np.zeros((n, n))        for i in range(n_rows):            for j in range(n_cols):                idx = i * n_cols + j                # Rook邻接(上下左右)                neighbors = []                if i > 0: neighbors.append((i-1) * n_cols + j)        # 上                if i < n_rows-1: neighbors.append((i+1) * n_cols + j)  # 下                if j > 0: neighbors.append(i * n_cols + (j-1))        # 左                if j < n_cols-1: neighbors.append(i * n_cols + (j+1))  # 右                # Queen额外加对角线                if contiguity == 'queen':                    if i > 0 and j > 0                        neighbors.append((i-1)*n_cols + (j-1))                    if i > 0 and j < n_cols-1                        neighbors.append((i-1)*n_cols + (j+1))                    if i < n_rows-1 and j > 0                        neighbors.append((i+1)*n_cols + (j-1))                    if i < n_rows-1 and j < n_cols-1                        neighbors.append((i+1)*n_cols + (j+1))                for nb in neighbors:                    W[idx, nb] = 1        # 行标准化        row_sums = W.sum(axis=1, keepdims=True)        row_sums[row_sums == 0] = 1  # 避免除以零        W = W / row_sums        return W    def _discretize(self, data):        """        将连续数据离散化为k个分位数类别        参数:        -----        data : 2D array, shape (n_regions, n_periods)        返回:        -----        classes : 2D array, 分类结果 (0, 1, ..., k-1)        """        # 使用所有数据计算分位数边界        all_values = data.flatten()        # 去掉NaN        all_values = all_values[~np.isnan(all_values)]        # 计算分位数边界        quantiles = np.linspace(0, 100, self.k + 1)        self.boundaries = np.percentile(all_values, quantiles)        # 分类        classes = np.zeros_like(data, dtype=int)        for i in range(self.k):            if i == self.k - 1:                mask = data >= self.boundaries[i]            else:                mask = (data >= self.boundaries[i]) & (data < self.boundaries[i+1])            classes[mask] = i        return classes    def fit(self, data, W):        """        拟合空间马尔科夫链模型        参数:        -----        data : 2D array, shape (n_regions, n_periods)               每行是一个地区,每列是一个时间点        W    : 2D array, shape (n_regions, n_regions)               行标准化的空间权重矩阵        """        n_regions, n_periods = data.shape        # Step 1: 离散化 - 将数据分为k个类别        self.state_classes = self._discretize(data)        # Step 2: 计算空间滞后        spatial_lag = np.zeros_like(data)        for t in range(n_periods):            spatial_lag[:, t] = W @ data[:, t]        # Step 3: 对空间滞后也进行离散化        self.lag_classes = self._discretize(spatial_lag)        # Step 4: 构建全局转移矩阵        self.transitions = np.zeros((self.k, self.k), dtype=int)        for t in range(n_periods - 1):            for i in range(n_regions):                current_state = self.state_classes[i, t]                next_state = self.state_classes[i, t+1]                self.transitions[current_state, next_state] += 1        # 转换为概率        row_sums = self.transitions.sum(axis=1, keepdims=True)        row_sums[row_sums == 0] = 1        self.global_tpm = self.transitions / row_sums        # Step 5: 构建空间条件转移矩阵        self.spatial_transitions = np.zeros((self.k, self.k, self.k), dtype=int)        # spatial_transitions[l, i, j] = 空间滞后类别为l时,从状态i到状态j的转移次数        for t in range(n_periods - 1):            for region in range(n_regions):                lag_class = self.lag_classes[region, t]                current_state = self.state_classes[region, t]                next_state = self.state_classes[region, t+1]                self.spatial_transitions[lag_class, current_state, next_state] += 1        # 转换为概率        self.spatial_tpms = np.zeros((self.k, self.k, self.k))        for l in range(self.k):            row_sums = self.spatial_transitions[l].sum(axis=1, keepdims=True)            row_sums[row_sums == 0] = 1            self.spatial_tpms[l] = self.spatial_transitions[l] / row_sums        return self    def summary(self):        """打印模型摘要"""        state_names = [f"Q{i+1}" for i in range(self.k)]        print("=" * 60)        print("        空间马尔科夫链分析结果")        print("=" * 60)        # 全局转移矩阵        print("\n📊 全局转移概率矩阵(经典马尔科夫链):")        print("-" * 40)        header = "      " + "  ".join([f"  {s}  " for s in state_names])        print(header)        for i, name in enumerate(state_names):            row = f"  {name}  "            row += "  ".join([f"{self.global_tpm[i,j]:.4f}" for j in range(self.k)])            row += f"  | n={self.transitions[i].sum()}"            print(row)        # 空间条件转移矩阵        lag_names = [f"低(Q1)", f"中低(Q2)", f"中高(Q3)", f"高(Q4)"]        if self.k == 3:            lag_names = ["低", "中", "高"]        elif self.k == 2:            lag_names = ["低", "高"]        for l in range(self.k):            print(f"\n📊 条件转移矩阵(邻居状态 = {lag_names[l] if l < len(lag_names) else f'Q{l+1}'}):")            print("-" * 40)            print(header)            for i, name in enumerate(state_names):                row = f"  {name}  "                row += "  ".join([f"{self.spatial_tpms[l,i,j]:.4f}" for j in range(self.k)])                row += f"  | n={self.spatial_transitions[l,i].sum()}"                print(row)        print("\n" + "=" * 60)    def plot_transition_matrices(self):        """可视化转移矩阵"""        fig, axes = plt.subplots(1, self.k + 1, figsize=(4*(self.k+1), 4))        state_names = [f"Q{i+1}" for i in range(self.k)]        # 全局矩阵        im = axes[0].imshow(self.global_tpm, cmap='YlOrRd', vmin=0, vmax=1)        axes[0].set_title('Global TPM', fontsize=12, fontweight='bold')        axes[0].set_xticks(range(self.k))        axes[0].set_yticks(range(self.k))        axes[0].set_xticklabels(state_names)        axes[0].set_yticklabels(state_names)        axes[0].set_xlabel('To')        axes[0].set_ylabel('From')        # 添加数值标注        for i in range(self.k):            for j in range(self.k):                axes[0].text(j, i, f'{self.global_tpm[i,j]:.3f}',                           ha='center', va='center', fontsize=9,                           color='white' if self.global_tpm[i,j] > 0.5 else 'black')        # 空间条件矩阵        for l in range(self.k):            im = axes[l+1].imshow(self.spatial_tpms[l], cmap='YlOrRd', vmin=0, vmax=1)            axes[l+1].set_title(f'Lag = Q{l+1}', fontsize=12, fontweight='bold')            axes[l+1].set_xticks(range(self.k))            axes[l+1].set_yticks(range(self.k))            axes[l+1].set_xticklabels(state_names)            axes[l+1].set_yticklabels(state_names)            axes[l+1].set_xlabel('To')            for i in range(self.k):                for j in range(self.k):                    axes[l+1].text(j, i, f'{self.spatial_tpms[l,i,j]:.3f}',                                 ha='center', va='center', fontsize=9,                                 color='white' if self.spatial_tpms[l,i,j] > 0.5 else 'black')        plt.colorbar(im, ax=axes, shrink=0.8, label='Transition Probability')        plt.suptitle('Spatial Markov Chain - Transition Probability Matrices'                     fontsize=14, fontweight='bold', y=1.02)        plt.tight_layout()        plt.show()# ========== 运行示例 ==========# 模拟数据:8×8网格,20个时期np.random.seed(42)n_rows, n_cols = 8, 8n_regions = n_rows * n_colsn_periods = 20# 生成具有空间自相关的模拟数据# 基础数据:带有空间结构(左上穷,右下富)data = np.zeros((n_regions, n_periods))for t in range(n_periods):    for i in range(n_rows):        for j in range(n_cols):            idx = i * n_cols + j            # 空间趋势 + 随机噪声 + 时间趋势            spatial_trend = (i + j) * 5            time_trend = t * 2            noise = np.random.normal(0, 5)            data[idx, t] = 30 + spatial_trend + time_trend + noise# 创建模型smc = SpatialMarkovChain(k=4)# 创建空间权重矩阵W = smc._create_weight_matrix(n_rows, n_cols, contiguity='rook')# 拟合模型smc.fit(data, W)# 输出结果smc.summary()# 可视化smc.plot_transition_matrices()

输出:

============================================================        空间马尔科夫链分析结果============================================================📊 全局转移概率矩阵(经典马尔科夫链):----------------------------------------        Q1      Q2      Q3      Q4    Q1  0.7586  0.2382  0.0031  0.0000  | n=319  Q2  0.1125  0.6013  0.2830  0.0032  | n=311  Q3  0.0000  0.1503  0.6176  0.2320  | n=306  Q4  0.0000  0.0000  0.1179  0.8821  | n=280📊 条件转移矩阵(邻居状态 = 低(Q1)):----------------------------------------        Q1      Q2      Q3      Q4    Q1  0.8462  0.1538  0.0000  0.0000  | n=273  Q2  0.4681  0.5106  0.0213  0.0000  | n=47  Q3  0.0000  0.0000  0.0000  0.0000  | n=0  Q4  0.0000  0.0000  0.0000  0.0000  | n=0📊 条件转移矩阵(邻居状态 = 中低(Q2)):----------------------------------------        Q1      Q2      Q3      Q4    Q1  0.2444  0.7333  0.0222  0.0000  | n=45  Q2  0.0610  0.7230  0.2160  0.0000  | n=213  Q3  0.0000  0.4528  0.5472  0.0000  | n=53  Q4  0.0000  0.0000  0.0000  0.0000  | n=0📊 条件转移矩阵(邻居状态 = 中高(Q3)):----------------------------------------        Q1      Q2      Q3      Q4    Q1  0.0000  1.0000  0.0000  0.0000  | n=1  Q2  0.0000  0.1800  0.8200  0.0000  | n=50  Q3  0.0000  0.1084  0.6897  0.2020  | n=203  Q4  0.0000  0.0000  0.4038  0.5962  | n=52📊 条件转移矩阵(邻居状态 = 高(Q4)):----------------------------------------        Q1      Q2      Q3      Q4    Q1  0.0000  0.0000  0.0000  0.0000  | n=0  Q2  0.0000  0.0000  0.0000  1.0000  | n=1  Q3  0.0000  0.0000  0.4000  0.6000  | n=50  Q4  0.0000  0.0000  0.0526  0.9474  | n=228============================================================

4.2 输出解读

运行上面的代码,你会看到类似这样的输出:

============================================================        空间马尔科夫链分析结果============================================================📊 全局转移概率矩阵(经典马尔科夫链):----------------------------------------        Q1      Q2      Q3      Q4    Q1  0.6842  0.2105  0.0789  0.0263  | n=304  Q2  0.1842  0.4934  0.2500  0.0724  | n=304  Q3  0.0592  0.2237  0.4934  0.2237  | n=304  Q4  0.0197  0.0724  0.2105  0.6974  | n=304📊 条件转移矩阵(邻居状态 = 低(Q1)):----------------------------------------  ...(穷邻居的转移模式)📊 条件转移矩阵(邻居状态 = 高(Q4)):----------------------------------------  ...(富邻居的转移模式)

下期预告:第5讲:使用PySAL进行专业分析

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  1. CONNECT:[ UseTime:0.001039s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001808s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.006343s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000846s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001509s ]
  6. SELECT * FROM `set` [ RunTime:0.000634s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001757s ]
  8. SELECT * FROM `article` WHERE `id` = 493024 LIMIT 1 [ RunTime:0.001199s ]
  9. UPDATE `article` SET `lasttime` = 1783082789 WHERE `id` = 493024 [ RunTime:0.001898s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000680s ]
  11. SELECT * FROM `article` WHERE `id` < 493024 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001278s ]
  12. SELECT * FROM `article` WHERE `id` > 493024 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.018472s ]
  13. SELECT * FROM `article` WHERE `id` < 493024 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003236s ]
  14. SELECT * FROM `article` WHERE `id` < 493024 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000957s ]
  15. SELECT * FROM `article` WHERE `id` < 493024 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001871s ]
0.280507s