{"id":50288,"date":"2023-12-15T00:48:05","date_gmt":"2023-05-23T06:23:20","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/spark-mllib%e7%9a%84prefixspan%e5%ae%9e%e7%8e%b0\/"},"modified":"2024-05-04T13:35:23","modified_gmt":"2024-05-04T05:35:23","slug":"spark-mllib%e7%9a%84prefixspan%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/spark-mllib%e7%9a%84prefixspan%e5%ae%9e%e7%8e%b0\/","title":{"rendered":"Spark mllib\u7684PrefixSpan\u5b9e\u73b0"},"content":{"rendered":"<h1>\u9996\u5148<\/h1>\n<p>\u8fd9\u7bc7\u6587\u7ae0\u662fApache Spark Advent Calendar 2015\u7b2c\u4e03\u5929\u7684\u6587\u7ae0\u3002<\/p>\n<p>\u4eceSpark 1.5\u5f00\u59cb\uff0c\u7cfb\u5217\u6a21\u5f0f\u6316\u6398\u7b97\u6cd5\u4e4b\u4e00\u7684PrefixSpan\u5df2\u88ab\u5b9e\u73b0\u5728mllib\u4e2d\u3002<\/p>\n<p>\u6211\u4eec\u8fc7\u53bb\u4e00\u76f4\u5bf9PrefixSpan\u7b97\u6cd5\u6709\u5174\u8da3\uff0c\u5b83\u53ef\u4ee5\u4ece\u6587\u6863\u548c\u641c\u7d22\u67e5\u8be2\u4e2d\u7684\u5173\u952e\u8bcd\u5e8f\u5217\u4e2d\u63d0\u53d6\u6709\u7528\u4fe1\u606f\u3002<\/p>\n<p>\u7531\u4e8ePrefixSpan\u7684\u5b9e\u73b0\u662f\u5728\u5185\u5b58\u4e2d\u5904\u7406\u6570\u636e\u7684\uff0c\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\u53d8\u5f97\u56f0\u96be\u3002\u4f46\u662f\uff0c\u968f\u7740\u4f7f\u7528Spark\u8fdb\u884c\u5206\u5e03\u5f0fPrefixSpan\u5b9e\u73b0\u7684\u51fa\u73b0\uff0c\u73b0\u5728\u53ef\u4ee5\u5bf9\u5927\u89c4\u6a21\u6570\u636e\u8fdb\u884c\u5e8f\u5217\u6a21\u5f0f\u62bd\u53d6\u4e86\u3002<\/p>\n<p>\u4e3a\u4e86\u786e\u8ba4Spark mllib\u7684\u5206\u5e03\u5f0fPrefixSpan\u5b9e\u73b0\u80fd\u5728\u591a\u957f\u65f6\u95f4\u5185\u5904\u7406\u591a\u5927\u6570\u636e\u91cf\uff0c\u6211\u4eec\u8fdb\u884c\u4e86\u4ece\u65e5\u672c\u8bedngram\u8bed\u6599\u5e93[2]\u76841000\u4e07\u4e2a\u6761\u76ee\u4e2d\u62bd\u53d6\u9891\u7e41\u5f62\u6001\u7d20\u6a21\u5f0f\u7684\u5904\u7406\u3002<\/p>\n<h1>\u64cd\u4f5c\u9a8c\u8bc1\u3001\u57fa\u51c6\u6d4b\u8bd5<\/h1>\n<h2>\u786e\u8ba4\u65b9\u5f0f<\/h2>\n<p>\u4e3a\u4e86\u786e\u8ba4\u5728Spark\u4e0a\u53ef\u4ee5\u5904\u7406\u591a\u5927\u89c4\u6a21\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u6267\u884c\u4ece\u65e5\u672c\u8bedngram\u7f51\u9875\u8bed\u6599\u5e93\u4e2d\u63d0\u53d6\u9891\u7e41\u5f62\u6001\u7d20\u5e8f\u5217\u7684\u5904\u7406\uff0c\u4ece\u800c\u5b9e\u73b0\u53ef\u5206\u5e03\u5904\u7406\u7684PrefixSpan\u5b9e\u65bd\u3002<\/p>\n<p>\u4f7f\u7528\u5230\u7684ngram\u8bed\u6599\u5e93\u662f\u5728[2]\u4e0a\u516c\u5f00\u53d1\u5e03\u7684\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">7gram<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">1000\u4e07\u4ef6<\/ul>\n<p>\u6211\u51b3\u5b9a\u5c06\u8be5\u6570\u636e\u63d2\u5165Cassandra\uff0c\u5e76\u901a\u8fc7Spark\u8bbf\u95ee\u5b83\uff0c\u4f7f\u7528PrefixSpan\u7b97\u6cd5\u63d0\u53d6\u9891\u7e41\u7684\u5f62\u6001\u7d20\u6a21\u5f0f\u3002<\/p>\n<pre class=\"post-pre\"><code>gm | partition | content                               | freq\r\n----+-----------+---------------------------------------+------\r\n  7 |         0 |           ( \u306f \u3061 \u304a\u3046\u3058 \u307f\u306a\u307f \u306e \u3048 |   18\r\n  7 |         0 |            ) \u304b\u3089 \u6853\u6b66 \u5929\u7687 \u306e \u6642\u4ee3 ( |   26\r\n  7 |         0 | ) \u306b\u3064\u3044\u3066 \u3011 \u5f53 \u30ad\u30e3\u30f3\u30da\u30fc\u30f3 \u7d42\u4e86 \u5f8c |   15\r\n  7 |         0 |                  ( \u307e\u3086 ) \u306e \u9593 \u3092 \u3001 |   11\r\n  7 |         0 |          3 \u5206 \u30d6\u30f3 \u306e 2 \u4ee5\u4e0a \u30a4\u30b8\u30e7\u30a6 |   11\r\n  7 |         0 |    ( PDF \u30d5\u30a1\u30a4\u30eb ) ( \u30c0\u30a6\u30f3\u30ed\u30fc\u30c9 \u3057 |   46\r\n  7 |         0 |          ( \u5076\u7136 \u304b\u3082 \u3057\u308c \u306a\u3044 \u3051\u3069 ) |   38\r\n  7 |         0 |              1 ) \u4e88\u5b9a \u4fa1\u683c \u8abf\u66f8 \u6848 \u306e |   20\r\n  7 |         0 |                  1 \u53f7 \u5e97 3 \u968e \u306e \u8ca9\u58f2 |   11\r\n  7 |         0 |        22 \u65e5 \u3001 \u6771\u4eac \u5730\u88c1 \u516b\u738b\u5b50 \u652f\u90e8 |   32\r\n\r\n<\/code><\/pre>\n<h2>\u96c6\u7fa4\u914d\u7f6e<\/h2>\n<p>\u6211\u5011\u6240\u4f7f\u7528\u7684 Spark \u96c6\u7fa4\u914d\u7f6e\u5982\u4e0b\u3002<\/p>\n<p>\u8fd9\u6b21\u4f7f\u7528\u7684\u805a\u7c7b\u662f\u7528\u4e8e\u8bc4\u4f30\u6d4b\u8bd5\u7684\uff0c\u65e0\u6cd5\u6d4b\u91cf\u5904\u7406\u65f6\u95f4\u6027\u80fd\u7684\u7edd\u5bf9\u80fd\u529b\u3002<br \/>\n\u4ec5\u4ec5\u662f\u4e3a\u4e86\u8bc4\u4f30\u80fd\u591f\u5904\u7406\u591a\u5c11\u6570\u636e\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Spark master 1\u53f0, Spark worker 7\u53f0\u69cb\u6210<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">cassandra server 3\u53f0<\/ul>\n<p>\u6240\u6709\u673a\u5668\u7684\u89c4\u683c\u51e0\u4e4e\u5b8c\u5168\u4e00\u6837\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">CPU: 4\u30b3\u30a2<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">mem: 32GB<\/ul>\n<p>\u6211\u4f7f\u7528\u4e86\u90a3\u53f0\u673a\u5668\u3002<\/p>\n<p>Spark\u7684\u914d\u7f6e\u662f\u4ec0\u4e48\uff1f<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">standalone mode<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">worker memory: 4GB<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">driver memory: 10GB<\/ul>\n<p>\u52aa\u529b\u4e86\u3002 le.)<\/p>\n<h2>\u5904\u7406\u65f6\u95f4<\/h2>\n<p>PrefixSpan\u7684\u53c2\u6570<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">minSupport\u3092 0.1\u301c 0.0001\u307e\u30673\u6bb5\u968e\u306b\u5909\u5316<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">maxPatternLength = 3\u306b\u56fa\u5b9a<\/ul>\n<p>\u9032\u884c\u4e86\u8a72\u6b65\u9a5f\u3002<\/p>\n<p>\u5728\u5c06\u6570\u636e\u4ececassandra\u4f5c\u4e3aRDD\u8bfb\u53d6\u540e\uff0c\u6211\u4eec\u5c06\u5176\u8fdb\u884c\u7f13\u5b58\uff0c\u4ee5\u5c3d\u91cf\u51cf\u5c11\u5bf9cassandra\u7684\u8bbf\u95ee\u5f00\u9500\u3002<\/p>\n<p>\u5904\u7406\u65f6\u95f4\u662f\u901a\u8fc7linux\u7684time\u547d\u4ee4\u6d4b\u91cf\u603b\u5904\u7406\u65f6\u95f4\u3002<\/p>\n<div>\n<div class=\"post-table\">minsupmin counttime0.11,000,0001m34.274s0.01100,0004m26.014s0.00110,0004m18.359s0.00011,00030m35.717s<\/div>\n<\/div>\n<h2>\u7ed3\u679c<\/h2>\n<p>\u5982\u679cminsup\u53d8\u5c0f\uff0c\u9891\u7e41\u9879\u96c6\u7684\u4e0d\u540c\u6570\u91cf\u4f1a\u589e\u52a0\uff0c\u76f8\u5e94\u5730\u9884\u8ba1\u5904\u7406\u65f6\u95f4\u5c06\u5448\u6307\u6570\u589e\u957f\uff0c\u5e76\u4e14\u5b9e\u9645\u6d4b\u91cf\u7ed3\u679c\u4e5f\u786e\u5b9e\u5982\u6b64\u3002\u6211\u4eec\u6210\u529f\u5730\u5728\u4e00\u4ebf\u6761\u5927\u89c4\u6a21\u6570\u636e\u4e2d\uff0c\u572830\u5206\u949f\u5185\u65e0OOM\u5730\u63d0\u53d6\u51fa\u8ba1\u6570\u5927\u4e8e\u7b49\u4e8e1000\u7684\u9891\u7e41\u6a21\u5f0f\uff0c\u4ece\u800c\u9a8c\u8bc1\u4e86\u5206\u6563PrefixSpan\u5b9e\u73b0\u7684\u6709\u6548\u6027\u3002<\/p>\n<h1>Spark MLlib\u7684PrefixSpan\u5b9e\u73b0\u6982\u8ff0<\/h1>\n<p>mllib PrefixSpan\u5b9e\u73b0<br \/>\nhttps:\/\/github.com\/apache\/spark\/blob\/master\/mllib\/src\/main\/scala\/org\/apache\/spark\/mllib\/fpm\/PrefixSpan.scala<\/p>\n<p>\u4ee5\u4e0b\u662f\u5904\u7406\u6d41\u7a0b\u7684\u6982\u8ff0\u3002<\/p>\n<h2>\u63d0\u53d6\u5e76\u6807\u8bc6\u9891\u7e41\u51fa\u73b0\u7684\u9879\u76ee<\/h2>\n<p>\u4f7f\u7528PrefixSpan\u7b97\u6cd5\u65b9\u6cd5\u6765<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u983b\u51faitem\u306e\u62bd\u51fa<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">minCount\u4ee5\u4e0a\u306e\u983b\u51faitem\u306eid\u5316<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u7cfb\u5217\u30d1\u30bf\u30fc\u30f3\u306e\u5185\u90e8\u8868\u73fe\u5316<\/ul>\n<p>\u5728PrefixSpan.scala\u7684\u4ee3\u7801\u4e2d\uff0c\u4e3a\u4e86\u627e\u5230\u5177\u6709\u7ed9\u5b9a\u524d\u7f00\u7684\u9891\u7e41\u5e8f\u5217\uff0c\u53ef\u4ee5\u4f7f\u7528\u8be5\u65b9\u6cd5\u3002<\/p>\n<p>\u6b63\u5728\u9644\u8fd1\u4e3e\u884c\u3002<\/p>\n<p>\u9891\u7e41\u51fa\u73b0\u7684\u9879\u76ee\u63d0\u53d6\u4e0e\u5355\u8bcd\u8ba1\u6570\u76f8\u540c\uff0c\u7ed3\u679c\u88ab\u6536\u96c6\u5230\u9a71\u52a8\u7a0b\u5e8f\u4e2d\u3002<\/p>\n<h2>PrefixSpan\u7684\u672c\u4f53\u5904\u7406 = \u83b7\u5f97\u9891\u7e41\u6a21\u5f0f<\/h2>\n<p>\u4ee5\u4e0b\u662f\u539f\u59cb\u7684\u53e5\u5b50\uff1a<br \/>\n1) \u304chttps:\/\/github.com\/apache\/spark\/blob\/master\/mllib\/src\/main\/scala\/org\/apache\/spark\/mllib\/fpm\/PrefixSpan.scala#L179<br \/>\n2) https:\/\/github.com\/apache\/spark\/blob\/master\/mllib\/src\/main\/scala\/org\/apache\/spark\/mllib\/fpm\/PrefixSpan.scala#L236<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e2d\u6587\u7ffb\u8bd1\uff1a<br \/>\n1) \u8fd9\u662fhttps:\/\/github.com\/apache\/spark\/blob\/master\/mllib\/src\/main\/scala\/org\/apache\/spark\/mllib\/fpm\/PrefixSpan.scala#L179<br \/>\n2) \u8fd9\u662fhttps:\/\/github.com\/apache\/spark\/blob\/master\/mllib\/src\/main\/scala\/org\/apache\/spark\/mllib\/fpm\/PrefixSpan.scala#L236<\/p>\n<p>\u6210\u4e3a\u3002<\/p>\n<p>\u5728\u8fd9\u4e2a\u65b9\u6cd5\u4e2d\uff0c\u5b9e\u73b0\u4e86\u5206\u6563\u7684PrefixSpan\u7b97\u6cd5\u3002<\/p>\n<h2>\u6839\u636e\u7269\u54c1\u8fdb\u884c\u6295\u5f71<\/h2>\n<p>\u6b63\u5728\u4f7f\u7528\u2191\u8fdb\u884c\u6267\u884c\u3002<\/p>\n<p>\u5728\u8fd9\u4e2a\u94fe\u63a5\u7684\u4ee3\u7801\u4e2d\uff08https:\/\/github.com\/apache\/spark\/blob\/master\/mllib\/src\/main\/scala\/org\/apache\/spark\/mllib\/fpm\/PrefixSpan.scala#L271\uff09\uff0c\u901a\u8fc7\u4f7f\u7528\u4e24\u4e2aflatMap\u5c06\u524d\u7f00\u548c\u540e\u7f00\u8fdb\u884c\u8fde\u63a5\uff0c\u5e76\u8ba1\u7b97\u9891\u7e41\u524d\u7f00\u53ca\u5176\u9891\u7387\u3002\u6700\u540e\uff0c\u7ed3\u679c\u4e5f\u88ab\u6536\u96c6\u5230\u4e86driver\u8282\u70b9\u4e0a\u3002<\/p>\n<p>\u6211\u8ba4\u4e3a\u8fd9\u5c31\u50cf\u5206\u6563PrefixSpan\u7b97\u6cd5\u7684\u6838\u5fc3\u4e00\u6837\u3002<\/p>\n<p>\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u5c3a\u5bf8\u8f83\u5c0f\u7684\u5c04\u5f71\u6570\u636e\u5e93\u5c06\u88ab\u4fdd\u5b58\u4e3asmallPrefixes\uff0c\u5e76\u901a\u8fc7\u4e0b\u4e00\u4e2alocalPrefixSpan\u5bf9\u8c61\u8fdb\u884c\u9012\u5f52\u5904\u7406\u3002<\/p>\n<h2>\u5728\u6bcf\u4e2aworker\u4e0a\u6267\u884clocalPrefixSpan.run<\/h2>\n<p>\u6b63\u5728\u6267\u884c\u4e2d\u3002<\/p>\n<h2>\u62bd\u53d6\u51fa\u7684\u6700\u7ec8\u5e38\u89c1\u6a21\u5f0f\u7ed3\u679c<\/h2>\n<p>\u6700\u7ec8\u5c06\u9a71\u52a8\u7a0b\u5e8f\u4fdd\u5b58\u7684\u7ecf\u5e38\u51fa\u73b0\u7684\u6a21\u5f0f\u4e0e\u6bcf\u4e2a\u5de5\u4f5c\u8282\u70b9\u4e0a\u7531localPrefixSpan\u5bf9\u8c61\u63d0\u53d6\u7684\u9891\u7e41\u6a21\u5f0f\u4f5c\u4e3aRDD\u8054\u5408\u8d77\u6765\u5e76\u8fd4\u56de\u3002<\/p>\n<h1>\u6700\u540e<\/h1>\n<p>\u6211\u5bf9\u4e4b\u524d\u975e\u5e38\u6709\u5174\u8da3\u7684\u5206\u6563PrefixSpan\u7684Spark mllib\u5b9e\u73b0\uff0c\u8fdb\u884c\u4e861000\u4e2a\u5927\u89c4\u6a21\u6570\u636e\u7684\u64cd\u4f5c\u786e\u8ba4\u3002\u5728\u8fdb\u884c\u64cd\u4f5c\u786e\u8ba4\u4e4b\u524d\uff0c\u6211\u5bf9\u80fd\u5426\u771f\u6b63\u5904\u7406\u5b9e\u9645\u95ee\u9898\u611f\u5230\u4e0d\u5b89\uff0c\u4f46\u662f\u5f53\u6700\u5c0f\u652f\u6301\u5ea6\u8d85\u8fc7\u4e00\u5b9a\u9608\u503c\u65f6\uff0c\u6211\u786e\u8ba4\u5b83\u53ef\u4ee5\u4ee5\u8db3\u591f\u9ad8\u7684\u901f\u5ea6\u8fdb\u884c\u5904\u7406\u3002<\/p>\n<p>\u5982\u679c\u8981\u4f7f\u7528PrefixSpan\u4ece\u5927\u89c4\u6a21\u8bed\u6599\u5e93\u548c\u641c\u7d22\u67e5\u8be2\u4e2d\u63d0\u53d6\u9891\u7e41\u5173\u952e\u5b57\u6a21\u5f0f\u548c\u8bcd\u7d20\u5e8f\u5217\u6a21\u5f0f\u3002<\/p>\n<ol>\u5728\u5e94\u7528PrefixSpan\u7b97\u6cd5\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\u65f6\u9762\u4e34\u7684\u56f0\u96be\uff1a\u63d0\u53d6\u65e0\u610f\u4e49\u7684\u9891\u7e41\u6a21\u5f0f\uff1b\u63d0\u53d6\u5b58\u5728\u4fe1\u606f\u91cd\u590d\u6216\u5305\u542b\u5173\u7cfb\u7684\u9891\u7e41\u6a21\u5f0f\u3002<\/ol>\n<p>\u6709\u4e09\u4e2a\u7f3a\u70b9\u3002<\/p>\n<ol>\u53ef\u4ee5\u4f7f\u7528Spark 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