The ideal output should show no or very few entries.

理想的输出应显示极少的条目，或者不显示任何条目。

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But in real world, it is very hard to get the ideal output because of noises.

然而，在现实世界中，由于各种干扰的存在，往往很难达到理想状态。

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In unsupervised learning, only learning to network with some samples, rather than provide an ideal output.

在无监督学习中，只向网络提供一些学习样本，而不提供理想的输出。

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The ability to control the spectral output of a quantum dot allows QDEF to create an ideal white backlight specifically designed for LCDs.

ENGADGET: 3M and Nanosys team-up to roll out quantum dot-enhanced LCDs