mirror of
https://github.com/moses-smt/mosesdecoder.git
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234 lines
7.3 KiB
C++
234 lines
7.3 KiB
C++
#ifndef LM_QUANTIZE_H
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#define LM_QUANTIZE_H
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#include "lm/blank.hh"
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#include "lm/config.hh"
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#include "lm/max_order.hh"
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#include "lm/model_type.hh"
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#include "util/bit_packing.hh"
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#include <algorithm>
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#include <vector>
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#include <stdint.h>
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#include <iostream>
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namespace lm {
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namespace ngram {
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struct Config;
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class BinaryFormat;
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/* Store values directly and don't quantize. */
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class DontQuantize {
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public:
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static const ModelType kModelTypeAdd = static_cast<ModelType>(0);
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static void UpdateConfigFromBinary(const BinaryFormat &, uint64_t, Config &) {}
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static uint64_t Size(uint8_t /*order*/, const Config &/*config*/) { return 0; }
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static uint8_t MiddleBits(const Config &/*config*/) { return 63; }
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static uint8_t LongestBits(const Config &/*config*/) { return 31; }
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class MiddlePointer {
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public:
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MiddlePointer(const DontQuantize & /*quant*/, unsigned char /*order_minus_2*/, util::BitAddress address) : address_(address) {}
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MiddlePointer() : address_(NULL, 0) {}
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bool Found() const {
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return address_.base != NULL;
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}
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float Prob() const {
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return util::ReadNonPositiveFloat31(address_.base, address_.offset);
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}
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float Backoff() const {
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return util::ReadFloat32(address_.base, address_.offset + 31);
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}
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float Rest() const { return Prob(); }
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void Write(float prob, float backoff) {
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util::WriteNonPositiveFloat31(address_.base, address_.offset, prob);
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util::WriteFloat32(address_.base, address_.offset + 31, backoff);
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}
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private:
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util::BitAddress address_;
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};
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class LongestPointer {
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public:
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explicit LongestPointer(const DontQuantize &/*quant*/, util::BitAddress address) : address_(address) {}
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LongestPointer() : address_(NULL, 0) {}
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bool Found() const {
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return address_.base != NULL;
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}
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float Prob() const {
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return util::ReadNonPositiveFloat31(address_.base, address_.offset);
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}
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void Write(float prob) {
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util::WriteNonPositiveFloat31(address_.base, address_.offset, prob);
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}
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private:
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util::BitAddress address_;
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};
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DontQuantize() {}
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void SetupMemory(void * /*start*/, unsigned char /*order*/, const Config & /*config*/) {}
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static const bool kTrain = false;
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// These should never be called because kTrain is false.
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void Train(uint8_t /*order*/, std::vector<float> &/*prob*/, std::vector<float> &/*backoff*/) {}
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void TrainProb(uint8_t, std::vector<float> &/*prob*/) {}
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void FinishedLoading(const Config &) {}
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};
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class SeparatelyQuantize {
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private:
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class Bins {
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public:
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// Sigh C++ default constructor
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Bins() {}
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Bins(uint8_t bits, float *begin) : begin_(begin), end_(begin_ + (1ULL << bits)), bits_(bits), mask_((1ULL << bits) - 1) {}
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float *Populate() { return begin_; }
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uint64_t EncodeProb(float value) const {
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return Encode(value, 0);
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}
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uint64_t EncodeBackoff(float value) const {
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if (value == 0.0) {
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return HasExtension(value) ? kExtensionQuant : kNoExtensionQuant;
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}
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return Encode(value, 2);
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}
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float Decode(std::size_t off) const { return begin_[off]; }
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uint8_t Bits() const { return bits_; }
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uint64_t Mask() const { return mask_; }
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private:
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uint64_t Encode(float value, size_t reserved) const {
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const float *above = std::lower_bound(static_cast<const float*>(begin_) + reserved, end_, value);
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if (above == begin_ + reserved) return reserved;
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if (above == end_) return end_ - begin_ - 1;
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return above - begin_ - (value - *(above - 1) < *above - value);
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}
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float *begin_;
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const float *end_;
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uint8_t bits_;
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uint64_t mask_;
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};
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public:
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static const ModelType kModelTypeAdd = kQuantAdd;
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static void UpdateConfigFromBinary(const BinaryFormat &file, uint64_t offset, Config &config);
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static uint64_t Size(uint8_t order, const Config &config) {
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uint64_t longest_table = (static_cast<uint64_t>(1) << static_cast<uint64_t>(config.prob_bits)) * sizeof(float);
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uint64_t middle_table = (static_cast<uint64_t>(1) << static_cast<uint64_t>(config.backoff_bits)) * sizeof(float) + longest_table;
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// unigrams are currently not quantized so no need for a table.
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return (order - 2) * middle_table + longest_table + /* for the bit counts and alignment padding) */ 8;
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}
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static uint8_t MiddleBits(const Config &config) { return config.prob_bits + config.backoff_bits; }
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static uint8_t LongestBits(const Config &config) { return config.prob_bits; }
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class MiddlePointer {
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public:
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MiddlePointer(const SeparatelyQuantize &quant, unsigned char order_minus_2, const util::BitAddress &address) : bins_(quant.GetTables(order_minus_2)), address_(address) {}
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MiddlePointer() : address_(NULL, 0) {}
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bool Found() const { return address_.base != NULL; }
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float Prob() const {
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return ProbBins().Decode(util::ReadInt25(address_.base, address_.offset + BackoffBins().Bits(), ProbBins().Bits(), ProbBins().Mask()));
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}
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float Backoff() const {
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return BackoffBins().Decode(util::ReadInt25(address_.base, address_.offset, BackoffBins().Bits(), BackoffBins().Mask()));
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}
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float Rest() const { return Prob(); }
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void Write(float prob, float backoff) const {
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util::WriteInt57(address_.base, address_.offset, ProbBins().Bits() + BackoffBins().Bits(),
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(ProbBins().EncodeProb(prob) << BackoffBins().Bits()) | BackoffBins().EncodeBackoff(backoff));
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}
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private:
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const Bins &ProbBins() const { return bins_[0]; }
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const Bins &BackoffBins() const { return bins_[1]; }
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const Bins *bins_;
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util::BitAddress address_;
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};
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class LongestPointer {
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public:
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LongestPointer(const SeparatelyQuantize &quant, const util::BitAddress &address) : table_(&quant.LongestTable()), address_(address) {}
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LongestPointer() : address_(NULL, 0) {}
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bool Found() const { return address_.base != NULL; }
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void Write(float prob) const {
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util::WriteInt25(address_.base, address_.offset, table_->Bits(), table_->EncodeProb(prob));
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}
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float Prob() const {
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return table_->Decode(util::ReadInt25(address_.base, address_.offset, table_->Bits(), table_->Mask()));
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}
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private:
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const Bins *table_;
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util::BitAddress address_;
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};
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SeparatelyQuantize() {}
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void SetupMemory(void *start, unsigned char order, const Config &config);
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static const bool kTrain = true;
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// Assumes 0.0 is removed from backoff.
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void Train(uint8_t order, std::vector<float> &prob, std::vector<float> &backoff);
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// Train just probabilities (for longest order).
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void TrainProb(uint8_t order, std::vector<float> &prob);
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void FinishedLoading(const Config &config);
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const Bins *GetTables(unsigned char order_minus_2) const { return tables_[order_minus_2]; }
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const Bins &LongestTable() const { return longest_; }
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private:
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Bins tables_[KENLM_MAX_ORDER - 1][2];
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Bins longest_;
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uint8_t *actual_base_;
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uint8_t prob_bits_, backoff_bits_;
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};
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} // namespace ngram
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} // namespace lm
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#endif // LM_QUANTIZE_H
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