Space saving histogram implementations
C2Params | C2Params are a wrapper struct for a set of CompactParams and CompressedParams .
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C2Histogram | C2Histogram is a combination of CompressedHistogram and CompactHistogram , performing
the memory saving operations from each of them. It is associated with C2Params .
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CompactHistogram | CompactHistogram is a fixed-size representation of a histogram. The set of possible
labels are partitioned into logarithmically scaled ranges, then further subdivided into
equally sized sub-ranges (equally sized within a given range).
A CompactHistogram stores a counter for each of the larger logarithmic ranges and which
of the equally sized sub-ranges contains the frequency-weighted average of the labels.
It is associated with CompactParams .
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CompactParams | CompactParams contains 3 critical parameters determining how a CompactHistogram
is stored and interpreted. See CompactHistogram for a full explanation.
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CompressedHistogram | Though not fixed, CompressedHistogram encodes histograms using less space than a StandardHistogram .
All of the frequencies for each label are approximated by a next greatest exponent.
CompressedHistogram uses a library HashMap to store the label-frequency pairs, so it is
unbounded in terms of space. It is associated with CompressedParams
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CompressedParams | CompactParams contains 2 parameters determining how a CompressedHistogram
is stored and interpreted. See CompressedHistogram for a full explanation.
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