估计阅读时长: 9 分钟 https://github.com/xieguigang/sciBASIC 在实际应用的机器学习方法里，GradientTree Boosting （GBDT）是一个在很多应用里都很出彩的技术。XGBoost是一套提升树可扩展的机器学习系统。XGBoost全名叫（eXtreme Gradient Boosting）极端梯度提升。它是大规模并行boosted tree的工具，XGBoost 所应用的算法就是 GBDT（gradient boosting decision tree）的改进，既可以用于分类也可以用于回归问题中。 Order by Date Name […]
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查询字符串以["起始，以"]结尾： SELECT * FROM biodeepdb_full.metabolite WHERE INSTR(name, '["') = 1 AND INSTR(name, '"]') = LENGTH(name) - LENGTH('"]') + 1 ORDER…
删除mysql表中重复的行数据 ``` delete t1 from metabolite t1 where t1.id in (select t2.id from (select id, `name`, formula, hashcode2, row_number() over(partition…
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