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HTML 

              
                <html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>DeeplearnJS linear regresion demo</title>

    <!-- deeplearn.js -->
    <script src="https://unpkg.com/deeplearn@latest"></script>
    <!-- highcharts.js -->
    <script src="https://cdn.hcharts.cn/highcharts/highcharts.js"></script>
</head>
<body>
    <div id="app" style="width: 500px;height:400px;"></div>
    
    <script>
Highcharts.theme = {
   colors: ['#DF5353', '#90ee7e', '#f45b5b', '#7798BF', '#aaeeee', '#ff0066',
      '#eeaaee', '#55BF3B', '#DF5353', '#7798BF', '#aaeeee'],
   chart: {
      backgroundColor: {
         linearGradient: { x1: 0, y1: 0, x2: 1, y2: 1 },
         stops: [
            [0, '#2a2a2b'],
            [1, '#3e3e40']
         ]
      },
      style: {
         fontFamily: '\'Unica One\', sans-serif'
      },
      plotBorderColor: '#606063'
   },
   title: {
      style: {
         color: '#E0E0E3',
         textTransform: 'uppercase',
         fontSize: '20px'
      }
   },
   subtitle: {
      style: {
         color: '#E0E0E3',
         textTransform: 'uppercase'
      }
   },
   xAxis: {
      gridLineColor: '#707073',
      labels: {
         style: {
            color: '#E0E0E3'
         }
      },
      lineColor: '#707073',
      minorGridLineColor: '#505053',
      tickColor: '#707073',
      title: {
         style: {
            color: '#A0A0A3'
         }
      }
   },
   yAxis: {
      gridLineColor: '#707073',
      labels: {
         style: {
            color: '#E0E0E3'
         }
      },
      lineColor: '#707073',
      minorGridLineColor: '#505053',
      tickColor: '#707073',
      tickWidth: 1,
      title: {
         style: {
            color: '#A0A0A3'
         }
      }
   },
   tooltip: {
      backgroundColor: 'rgba(0, 0, 0, 0.85)',
      style: {
         color: '#F0F0F0'
      }
   },
   
   legend: {
      itemStyle: {
         color: '#E0E0E3'
      },
      itemHoverStyle: {
         color: '#FFF'
      },
      itemHiddenStyle: {
         color: '#606063'
      }
   },
   credits: {
      style: {
         color: '#666'
      }
   },
   labels: {
      style: {
         color: '#707073'
      }
   }
};

// Apply the theme
Highcharts.setOptions(Highcharts.theme);


// 建構資料
const degrees = [29, 28, 34, 31, 25, 29, 32, 31, 24, 33, 25, 31, 26, 30];
const salesVolume = [77, 62, 93, 84, 59, 64, 80, 75, 58, 91, 51, 73, 65, 84];

// for 繪圖用
const dataset = [];
for (let i=0; i<14; i++) {
    dataset.push({
        x: degrees[i],
        y: salesVolume[i]
    })
}
      
// 運用 Deeplearn.js 結構化資料
const degrees_data = dl.tensor1d(degrees);
const salesVolume_data = dl.tensor1d(salesVolume);

// 要 train 的參數 aw, ba
const aw = dl.variable(dl.scalar(Math.random()));
const ba = dl.variable(dl.scalar(Math.random()));

// 定義目標函數 與 loss function （最一般的 mean square）
// f = aw * X + ba
const f = x => aw.mul(x).add(ba);
const loss = (pred, label) => pred.sub(label).square().mean();
          
// 採用 stochastic gradient descent 來做最佳化 
// learning rate 這邊不能設太大
const learningRate = 0.0005;
const optimizer = dl.train.sgd(learningRate);

// trianing
for (let i = 0; i < 30; i++) {
  const cost = optimizer.minimize(() => loss(f(degrees_data), salesVolume_data), true, [aw, ba])
  console.log('cost');
  cost.print();
  console.log('aw');
  aw.print();
  console.log('ba');
  ba.print();
}


// 利用 dataSync() 取出 training 後得到的係數
const awPredict = aw.dataSync();
const baPredict = ba.dataSync();

// 根據算出的係數，畫出線條頭尾兩點
const dataLine = [
    [22, parseFloat(22 * awPredict + baPredict)],
    [35, parseFloat(35 * awPredict + baPredict)]
]

// 用 HighCharts 繪圖
const options = {
    title: {
        text: 'deeplearn.js  最高溫與紅茶銷售量'                 
    },
    xAxis: {
      title: {
        text: '氣溫'                 
      },
      min: 20,
      max: 40
    },
    yAxis: {
      title: {
        text: '銷售量'                 
      },
      min: 40,
      max: 100
    },
    series: [
        {
            type: 'line',
            name: 'predict line',
            data: dataLine
        },  
        {
            type: 'scatter',
            name: 'dataset',
            marker: {
                symbol: 'cross',  
                radius: 4         
            },
            data: dataset
        }
    ]
}
// 繪製圖表
const chart = Highcharts.chart('app', options);

    </script>
</body>
</html>
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