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【多选题】
关于特征选择，下列说法正确的是A.
剔除了无关特征，有利于降低学习任务的难度，也可以增加模型的可解释性
B.
通常可从两个方面来进行特征选择： 1 ）特征是否发散； 2 ）特征与目标的相关性
C.
每个样本往往具有多个特征，特征选择是指从中选择对于学习任务，例如分类问题有帮助的若干特征
D.
特征减少了，维度就下降了，可以提升模型的效率。因为在实际应用尤其是在文本处理中，经常会出现维度灾难问题
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【简答题】与1000H等值的十进制数是( ) xh15
【单选题】光波长转换技术(OTU)的作用是
A.
进行波长转换，提供标准、稳定的光源，提供较大色散容纳值的光源，作为再生器使用
B.
对经过线路衰减后的小信号进行预放大
C.
对各相关部件的故障告警、故障定位
D.
在一个新波长上传送有关DWDM系统的网元管理和监控信息
【单选题】Why does CareerSite’s agent offer each job hunter only three job options?
A.
To focus on better job matches.
B.
To attract more returning visits.
C.
To reserve space for more messages.
D.
To increase the rate of success.
【单选题】The chairman ______ that this year's prize winner is Dr. Hunter.
A.
announced
B.
declared
C.
stated
D.
pronounced
【单选题】If Hunter's artistic work were to return to its earlier political forum, assessments of it would be likely to contain which of the following?
A.
An evaluation that accords high status to her work
B.
Acknowledgement of her political acumen but dismissal of her subject matter as contentious
C.
Agreements with assessments made prior to the 1980's but acknowledgments of the evolution in her art work
D.
Placement of her among the foremost artists of the pre-1980's
E.
A reclassification of her work as psychoanalytical rather than political
【简答题】与1000H等值的十进制数是( )
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