| Time series models |
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| • | Inference is
difficult in directed models of time |
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| series if we use distributed representations in |
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| the hidden units. |
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| • | So people tend to
avoid distributed |
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| representations
and use much weaker methods |
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| (e.g. HMM’s) that
are based on the idea that |
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| each visible
frame of data has a single cause |
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| (e.g. it came
from one hidden state of the HMM) |
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