KNN自适应参数化趋势跟踪策略

/*backtest
start: 2024-10-01 00:00:00
end: 2024-10-31 23:59:59
period: 1h
basePeriod: 1h
exchanges: [{"eid":"Futures_Binance","currency":"BTC_USDT"}]
*/

//@version=6
strategy("Trend Following Strategy with KNN", overlay=true,commission_value=0.03,currency='USD', commission_type=strategy.commission.percent,default_qty_type=strategy.cash)


// Input parameters
k = input.int(5, title="K (Number of Neighbors)", minval=1)  // Number of neighbors for KNN algorithm
window_size = input.int(20, title="Window Size", minval=1)  // Window size for feature vector calculation
ma_length = input.int(50, title="MA Length", minval=1)  // Length of the moving average

// Calculate moving average
ma = ta.sma(close, ma_length)

// Initialize variables
var float[] features = na
var float[] distances = na
var int[] nearest_neighbors = na

if bar_index >= window_size - 1  // Ensure there is enough historical data
    features := array.new_float(0)  // Keep only the current window data
    for i = 0 to window_size - 1
        array.push(features, close[i])

    // Calculate distances
    distances := array.new_float(0)  // Clear the array for each calculation
    for i = 0 to window_size - 1  // Calculate the distance between the current price and all prices in the window
        var float distance = 0.0
        for j = 0 to window_size - 1
            distance += math.pow(close[j] - array.get(features, j), 2)
        distance := math.sqrt(distance)
        array.push(distances, distance)

    // Find the nearest neighbors
    if array.size(distances) > 0 and array.size(distances) >= k
        nearest_neighbors := array.new_int(0)
        for i = 0 to k - 1
            var int min_index = -1
            var float min_distance = na
            for j = 0 to array.size(distances) - 1
                if na(min_distance) or array.get(distances, j) < min_distance
                    min_index := j
                    min_distance := array.get(distances, j)
            if min_index != -1
                array.push(nearest_neighbors, min_index)
                array.remove(distances, min_index)  // Remove the processed neighbor

    // Calculate the average price change of the neighbors
    var float average_change = 0.0
    if array.size(nearest_neighbors) > 0
        for i = 0 to array.size(nearest_neighbors) - 1
            var int index = array.get(nearest_neighbors, i)
            // Ensure index + 1 is within range
            if index + 1 < bar_index
                average_change += (close[index] - close[index + 1])
        average_change := average_change / array.size(nearest_neighbors)

    // Generate trading signals
    if average_change > 0 and close > ma
        strategy.entry("Long", strategy.long)
    else if average_change < 0 and close < ma
        strategy.entry("Short", strategy.short)

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