{"id":197318,"student_id":281,"content":"function sigmoid(x) {\n return (Math.exp(x) - Math.exp(-x)) / (Math.exp(x) + Math.exp(-x));\n}\n\nfunction dsigmoid(x) {\n return 1.0 - x*x;\n}\n\nvar ia = 0; //輸入:耳朵長度\nvar ib = 0; //輸入:尾巴長度\nvar wa = 0; //權重:耳朵長度\nvar wb = 0; //權重尾巴長度\nvar rate = 0.01; // 速率\n\n// 訓練感知器的假資料 [耳朵長度, 尾巴長度, 物種]\nvar data = [\n //一般貓咪\n [3.5, 12.1, 1],\n [3.8, 12.3, 1],\n [3.2, 12.5, 1],\n [4.0, 13.1, 1],\n [3.9, 13.0, 1],\n [3.5, 12.7, 1],\n [3.7, 12.8, 1],\n [3.5, 12.9, 1],\n [3.3, 12.3, 1],\n [3.3, 12.9, 1],\n //一般兔子\n [9.1, 7.2, -1],\n [8.7, 7.4, -1],\n [9.3, 7.6, -1],\n [9.2, 7.1, -1],\n [9.0, 7.9, -1],\n [9.1, 6.8, -1],\n [8.5, 7.8, -1],\n [8.6, 8.1, -1],\n [8.9, 8.3, -1],\n [8.8, 7.9, -1],\n];\n\n\n// 繪圖 \u0026 顯示數值\nforever(function() {\n pen.fillColor = 'black';\n pen.drawLine(100, 100, 300, 240);\n pen.drawLine(100, 380, 300, 240);\n pen.drawLine(300, 240, 450, 240);\n pen.drawCircle(100, 100, 20);\n pen.drawCircle(100, 380, 20);\n pen.drawCircle(300, 240, 20);\n \n var output = NN(ia, ib, wa, wb);\n print('i1: ' + ia, 90, 60, 'blue');\n print('i2: ' + ib, 90, 340, 'blue');\n print('w1: ' + wa, 200, 170, 'red');\n print('w1: ' + wb, 200, 310, 'red');\n print(output, 455, 230, 'green');\n \n cat.opacity = (output+1)/2;\n rabbit.opacity = 1- (output+1)/2;\n});\n\n// 感知器\nfunction NN (input_a, input_b, weight_a, weight_b) {\n return sigmoid( input_a*weight_a + input_b*weight_b )\n}\n\n// 訓練\nfunction train (input_a, input_b, target) {\n var output = NN( input_a,input_b, wa, wb)\n var loss = target - output\n var error = dsigmoid(output)*loss\n wa += rate*error*input_a\n wb += rate*error*input_b\n}\n\n// 點擊畫面時輸入耳朵長度\u0026尾巴長度\nwhen('click', () =\u003e {\n ia = Number(prompt('耳朵長度為?'))\n ib = Number(prompt('尾巴長度為?'))\n});\n\n// 按下「空白」按鍵時進行一輪訓練\nwhen('keydown', 'space', () =\u003e {\n for(var i =0; i\u003cdata.length; i++){\n train(data[i][0], data[i][1], data[i][2]) \n }\n});\n\n\n\n","created_at":"2020-10-24T00:09:52.309+08:00","updated_at":"2020-10-24T11:27:53.898+08:00","name":"貓咪兔子分類 副本 副本","language":"javascript","screenshot":{"url":"https://cdn8.koding.school/uploads/project/screenshot/197318/9e6b66005193744331391345c8c0a9f4.jpg"},"parent_id":110071,"plugin":"var cat = createSprite('cat.jpeg');\nvar rabbit = createSprite('rabbit.jpg');\ncat.moveTo(500, 100);\ncat.scale = 0.5;\nrabbit.moveTo(500, 380);\nrabbit.scale = 0.5;","description":null,"note":null,"status":"public","like_student_ids":[],"is_featured":false,"views":45,"hashid":"wdks4v385","is_content_changed":false,"review_status":"unsubmitted","submitted_at":null,"reviewed_at":null,"advise":null,"is_deleted":false}
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