From 2b63fa0755954edf467a2421997eaf72771260cf Mon Sep 17 00:00:00 2001
From: Kenneth Heafield <github@kheafield.com>
Date: Wed, 16 May 2012 13:24:08 -0700
Subject: Big kenlm change includes lower order models for probing only.  And
 other stuff.

---
 klm/lm/value.hh | 157 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 157 insertions(+)
 create mode 100644 klm/lm/value.hh

(limited to 'klm/lm/value.hh')

diff --git a/klm/lm/value.hh b/klm/lm/value.hh
new file mode 100644
index 00000000..85e53f14
--- /dev/null
+++ b/klm/lm/value.hh
@@ -0,0 +1,157 @@
+#ifndef LM_VALUE__
+#define LM_VALUE__
+
+#include "lm/model_type.hh"
+#include "lm/value_build.hh"
+#include "lm/weights.hh"
+#include "util/bit_packing.hh"
+
+#include <inttypes.h>
+
+namespace lm {
+namespace ngram {
+
+// Template proxy for probing unigrams and middle.
+template <class Weights> class GenericProbingProxy {
+  public:
+    explicit GenericProbingProxy(const Weights &to) : to_(&to) {}
+
+    GenericProbingProxy() : to_(0) {}
+
+    bool Found() const { return to_ != 0; }
+
+    float Prob() const {
+      util::FloatEnc enc;
+      enc.f = to_->prob;
+      enc.i |= util::kSignBit;
+      return enc.f;
+    }
+
+    float Backoff() const { return to_->backoff; }
+
+    bool IndependentLeft() const {
+      util::FloatEnc enc;
+      enc.f = to_->prob;
+      return enc.i & util::kSignBit;
+    }
+
+  protected:
+    const Weights *to_;
+};
+
+// Basic proxy for trie unigrams.  
+template <class Weights> class GenericTrieUnigramProxy {
+  public:
+    explicit GenericTrieUnigramProxy(const Weights &to) : to_(&to) {}
+
+    GenericTrieUnigramProxy() : to_(0) {}
+
+    bool Found() const { return to_ != 0; }
+    float Prob() const { return to_->prob; }
+    float Backoff() const { return to_->backoff; }
+    float Rest() const { return Prob(); }
+
+  protected:
+    const Weights *to_;
+};
+
+struct BackoffValue {
+  typedef ProbBackoff Weights;
+  static const ModelType kProbingModelType = PROBING;
+
+  class ProbingProxy : public GenericProbingProxy<Weights> {
+    public:
+      explicit ProbingProxy(const Weights &to) : GenericProbingProxy<Weights>(to) {}
+      ProbingProxy() {}
+      float Rest() const { return Prob(); }
+  };
+
+  class TrieUnigramProxy : public GenericTrieUnigramProxy<Weights> {
+    public:
+      explicit TrieUnigramProxy(const Weights &to) : GenericTrieUnigramProxy<Weights>(to) {}
+      TrieUnigramProxy() {}
+      float Rest() const { return Prob(); }
+  };
+
+  struct ProbingEntry {
+    typedef uint64_t Key;
+    typedef Weights Value;
+    uint64_t key;
+    ProbBackoff value;
+    uint64_t GetKey() const { return key; }
+  };
+
+  struct TrieUnigramValue {
+    Weights weights;
+    uint64_t next;
+    uint64_t Next() const { return next; }
+  };
+
+  const static bool kDifferentRest = false;
+
+  template <class Model, class C> void Callback(const Config &, unsigned int, typename Model::Vocabulary &, C &callback) {
+    NoRestBuild build;
+    callback(build);
+  }
+};
+
+struct RestValue {
+  typedef RestWeights Weights;
+  static const ModelType kProbingModelType = REST_PROBING;
+
+  class ProbingProxy : public GenericProbingProxy<RestWeights> {
+    public:
+      explicit ProbingProxy(const Weights &to) : GenericProbingProxy<RestWeights>(to) {}
+      ProbingProxy() {}
+      float Rest() const { return to_->rest; }
+  };
+
+  class TrieUnigramProxy : public GenericTrieUnigramProxy<Weights> {
+    public:
+      explicit TrieUnigramProxy(const Weights &to) : GenericTrieUnigramProxy<Weights>(to) {}
+      TrieUnigramProxy() {}
+      float Rest() const { return to_->rest; }
+  };
+
+// gcc 4.1 doesn't properly back dependent types :-(.  
+#pragma pack(push)
+#pragma pack(4)
+  struct ProbingEntry {
+    typedef uint64_t Key;
+    typedef Weights Value;
+    Key key;
+    Value value;
+    Key GetKey() const { return key; }
+  };
+
+  struct TrieUnigramValue {
+    Weights weights;
+    uint64_t next;
+    uint64_t Next() const { return next; }
+  };
+#pragma pack(pop)
+
+  const static bool kDifferentRest = true;
+
+  template <class Model, class C> void Callback(const Config &config, unsigned int order, typename Model::Vocabulary &vocab, C &callback) {
+    switch (config.rest_function) {
+      case Config::REST_MAX:
+        {
+          MaxRestBuild build;
+          callback(build);
+        }
+        break;
+      case Config::REST_LOWER:
+        {
+          LowerRestBuild<Model> build(config, order, vocab);
+          callback(build);
+        }
+        break;
+    }
+  }
+};
+
+} // namespace ngram
+} // namespace lm
+
+#endif // LM_VALUE__
-- 
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