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java: (String[])List.toArray() gives ClassCastException
... it can't determine what type of array to create.
use
toArray(new String[v2.size()]);
which allocates the right kind of array (String[] and of the right size)
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如何选择机器学习算法 - 大数据 & AI - 清泛网移动版 - 专注C/C++及内核技术
...得这些年用着还不错的常规指南。
How large is your training set?
训练集有多大？
If your training set is small, high bias/low variance classifiers (e.g., Naive Bayes) have an advantage over low bias/high variance classifiers (e.g., kNN), since the latter will overfi...
Best way to alphanumeric check in JavaScript
...doesn't imply that there are no exceptions.
– Risto Välimäki
Jun 8 '15 at 6:38
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Making 'git log' ignore changes for certain paths
...6315f74 ("ls-files: add pathspec matching for submodules", 2016-10-07, Git v2.11.0-rc0 -- merge listed in batch #11) and 89a1f4aaf7 ("dir: if our pathspec might match files under a dir, recurse into it", 2019-09-17, Git v2.24.0-rc0).
Of course, do_match_pathspec() had an important advantge over matc...
搭建高可用mongodb集群（三）—— 深入副本集内部机制 - 大数据 & AI - 清...
...这么描述:
We use a consensus protocol to pick a primary. Exact details will be spared here but that basic process is:
get maxLocalOpOrdinal from each server.
if a majority of servers are not up (from this server’s POV), remain in Secondary mode and stop.
if the last op time se...
git stash -> merge stashed change with current changes
...l 19 '19 at 12:22
Frank-Rene SchäferFrank-Rene Schäfer
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Reshape three column data frame to matrix (“long” to “wide” format) [duplicate]
...
base R, unstack
unstack(df, V3 ~ V2)
# a b c
# 1 1 2 3
# 2 3 3 2
This may not be a general solution but works well in this case.
data
df<-structure(list(V1 = structure(c(1L, 1L, 1L, 2L, 2L, 2L), .Label = c("x",
"y"), class = "factor"), V2 = structu...
数据挖掘——分词入门 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...分词：
public class TestPositiveMatch {
public static void main(String[] args) {
String str = "我爱这个中华人民共和国大家庭";
List normalDict = new ArrayList();
normalDict.add("");
normalDict.add("爱");
normalDict.add("中华...
What is an Android PendingIntent?
...om it was said by Antoine de Saint Exupéry and translated by Lewis Galantière ;)
– Choletski
Jul 20 '16 at 15:48
How to tell if browser/tab is active [duplicate]
... visible but an another window is active.
– Juha Syrjälä
Jul 25 '17 at 19:37
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FYI: caniuse.co...