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less than 2**precision.
Prior to the change, the op did nothing when the sum of quantized pmf was less
than 2**precision. While the produced CDF was valid for range coders,
adjustments to CDF could be made to achieve better compression rate.
PiperOrigin-RevId: 193558740
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The added op transforms probability mass functions (PMF) to quantized
cumulative distribution function (CDF), which can be used by range coder ops in
contrib/coder.
The op takes greedy approach to ensure that the post-quantization probability
masses do not sum over the maximum quantized value. The op does not make any
adjustment when the post-quantization probability masses already sum less than
the maximum value.
PiperOrigin-RevId: 192827779
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PiperOrigin-RevId: 182293433
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Sung Jin Hwang