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do..end vs curly braces for blocks in Ruby
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How to convert an array of strings to an array of floats in numpy?
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Well, if you're reading the data in as a list, just do np.array(map(float, list_of_strings)) (...
Can someone explain the traverse function in Haskell?
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traverse is the same as fmap, except that it also allows you to run effects while you're rebui...
Can I add jars to maven 2 build classpath without installing them?
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edited Aug 9 at 15:39
Spooky
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Safely limiting Ansible playbooks to a single machine?
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Any reason not to use '+' to concatenate two strings?
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There is nothing wrong in concatenating two strings with +. Indeed it's easier to read than ''...
How to delete multiple buffers in Vim?
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You can use <C-a> to complete all matches. So if you type :bd *.xml and then hit <C-a...
从源代码剖析Mahout推荐引擎 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
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1. Mahout推荐引擎概况
Mahout的推荐引擎，要从org.apache.mahout.cf.taste包说起。
packages的说明：
common: 公共类包括，异常，数据刷新接口，权重常量
eval: 定义构造器接口，...
Apache Spark: The number of cores vs. the number of executors
... Imagine a cluster with six nodes running NodeManagers, each
equipped with 16 cores and 64GB of memory. The NodeManager capacities,
yarn.nodemanager.resource.memory-mb and
yarn.nodemanager.resource.cpu-vcores, should probably be set to 63 *
1024 = 64512 (megabytes) and 15 respectively. We avoid allo...