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Pronunciation Guide
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The inverse document frequency is just the log of the number of training libraries you're trying to distinguish divided by the number of libraries
in which the by bigram occurs.
So if Angela Merkel appears in all 56 training libraries that I'm looking at, it's going to be log of 56 divided by 56 log of one zero.
Listen to native speakers pronounce “bigram” in real conversational contexts with synchronized timestamps and subtitles.