{"id":67470,"student_id":4667,"content":"var grid = [\n '******',\n '* *',\n '* ** *',\n '* *C *',\n '* *',\n '******',\n];\ninit(grid);\n\nplayer.reset(1, 1); // 初始化老鼠位置\n\nvar Q = {\n\n}; //老鼠的大腦\nvar S1; //上一次的狀態(位置)\nvar S2; //當前的狀態(位置)\nvar A; //上一次的動作(移動方向)\nvar alpha = 0.8; // 學習速率\nvar beta = 0.5; // 衰減值\n\n\nforever(function(){\n S1 = player.x + ':' + player.y\n if(Q[S1] == undefined) {\n Q[S1] = [0,0,0,0]\n }\n \n var max = Math.max(Q[S1][0],Q[S1][1],Q[S1][2],Q[S1][3])\n A = Q[S1].indexOf(max)\n \n if( A == 0 ) {\n player.x--\n }else if(A == 1) {\n player.x++\n }else if(A == 2) {\n player.y--\n }else if(A == 3) {\n player.y++\n }\n \n S2 = player.x + ':' + player.y\n if(Q[S2] == undefined) {\n Q[S2] = [0,0,0,0]\n }\n if(grid[player.y][player.x] == '*') {\n reward(Q, S1, A, S2, -100)\n player.reset(1, 1);\n }\n if(grid[player.y][player.x] == 'C') {\n reward(Q, S1, A, S2, 10)\n player.reset(1, 1);\n }\n if(grid[player.y][player.x] == ' ') {\n reward(Q, S1, A, S2, -1)\n }\n});\n\n// 懲罰獎勵\nfunction reward (Q, S1, A, S2, score) {\n Q[S1][A] = (1-alpha)*Q[S1][A]+ alpha*(score+beta*Math.max(Q[S2][0],Q[S2][1],Q[S2][2],Q[S2][3])) \n}","created_at":"2019-05-11T18:56:08.250+08:00","updated_at":"2019-11-12T07:31:23.480+08:00","name":"老鼠找起司(2) 副本","language":"javascript","screenshot":{"url":"https://cdn0.koding.school/uploads/project/screenshot/67470/773730b884eceedbc90b797bfc9db0d3.jpg"},"parent_id":65017,"plugin":"var rat = createSprite('mouse.png');;\nvar cheese = createSprite('cheese.png');\nvar W;\nvar H;\nvar width = 40;\n\nfunction init (grid) {\n\n H = grid.length;\n W = grid[0].length;\n\n for (var y = 0; y \u003c H; y++) {\n for (var x = 0; x \u003c W; x++) {\n if (grid[y][x] == 'C') {\n cheese.moveTo(x*width + width/2, y*width + width/2);\n }\n }\n }\n\n forever(function() {\n for (var y = 0; y \u003c H; y++) {\n for (var x = 0; x \u003c W; x++) {\n pen.fillColor = (grid[y][x] == '*' ? 'black' : 'white')\n pen.drawRect(x*width, y*width, width, width);\n }\n }\n });\n}\n\nfunction randomGrid (col, row, rate) {\n var col = col \u003c 16 ? col : 16;\n var row = row \u003c 12 ? row : 12;\n var grid = [];\n for (var y = 0; y \u003c row - 2; y++) {\n grid[y] = '';\n for (var x = 0; x \u003c col - 2 ; x++) {\n if (x == col - 3 \u0026\u0026 y == row - 3) grid[y] += 'C';\n else grid[y] += Math.random() \u003c rate ? '*' : ' ';\n }\n grid[y] = '*' + grid[y] + '*';\n }\n var s = Array(col).fill('*').join('');\n grid.push(s);\n grid.unshift(s);\n return grid;\n}\n\nvar player = {\n x: 1,\n y: 1,\n reset: function (x, y) {\n this.x = x;\n this.y = y;\n }\n}\n\nforever(function () {\n rat.moveTo(player.x*width + width/2, player.y*width + width/2);\n})\n\n","description":null,"note":null,"status":"public","like_student_ids":[],"is_featured":false,"views":319,"hashid":"wdks9pqy","is_content_changed":false,"review_status":"unsubmitted","submitted_at":null,"reviewed_at":null,"advise":null,"is_deleted":false}
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