题目内容

In those days John with his classmates _____ kept busy preparing for the exam.

A. is
B. are
C. was
D. were

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your clothes?No, mine _ hanging over there.

A. Is it, is
B. Are these, are
C. Is it, are
D. Are these, is

The Smith’s family, which rather a large one, very fond of their old houses.

A. were, were
B. was, was
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设有目标函数F=Σ[ynln(p)+(1-yn)ln(1-p)]，其中p=1/(1+exp(-w.Tx))，w和x均为n1维向量。则∂F/∂p的维度是___×_，∂F/∂w的维度是_×_，∂F/∂x的维度是_×___