PHP实现商品库存预测的算法与模型

// 读取CSV文件
$data = array_map('str_getcsv', file('sales_data.csv'));

// 定义数组来存储预处理后的数据
$normalizedData = array();

// 对数据进行预处理
foreach ($data as $row) {
    $date = strtotime($row[0]);
    $quantity = $row[1];

    // 归一化处理
    $normalizedQuantity = ($quantity - $min) / ($max - $min);

    $normalizedData[] = array($date, $normalizedQuantity);
}

// 分离特征值和目标值
$dates = array_column($normalizedData, 0);
$quantities = array_column($normalizedData, 1);

// 使用线性回归模型
$model = new LinearRegression();
$model->train($dates, $quantities);

// 设置预测的时间范围
$startDate = strtotime('2022-01-01');
$endDate = strtotime('2022-12-31');

// 预测销售数量
$predictedQuantities = array();

// 对每个日期进行预测
for ($date = $startDate; $date <= $endDate; $date += 86400) {
    $predictedQuantity = $model->predict($date);

    // 还原归一化处理
    $quantity = $predictedQuantity * ($max - $min) + $min;

    $predictedQuantities[] = array(date('Y-m-d', $date), $quantity);
}

// 绘制曲线图或者计算销售总量等指标
foreach ($predictedQuantities as $row) {
    echo $row[0] . "：" . $row[1] . "</br>";
}