The Tor Browser: browser/components/translation/cld2/internal/tote.cc@b8a032363ba2 (annotated)

browser/components/translation/cld2/internal/tote.cc@b8a032363ba2 (annotated)

browser/components/translation/cld2/internal/tote.cc

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 // Copyright 2013 Google Inc. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 //
 // Author: dsites@google.com (Dick Sites)
 //
 #include "tote.h"
 #include "lang_script.h"    // For LanguageCode in Dump
 #include <stdio.h>
 #include <string.h>         // For memset
 namespace CLD2 {
 // Take a set of <key, value> pairs and tote them up.
 // After explicitly sorting, retrieve top key, value pairs
 // Normal use is key=per-script language and value = probability score
 Tote::Tote() {
   in_use_mask_ = 0;
   byte_count_ = 0;
   score_count_ = 0;
   // No need to initialize values
 }
 Tote::~Tote() {
 }
 void Tote::Reinit() {
   in_use_mask_ = 0;
   byte_count_ = 0;
   score_count_ = 0;
   // No need to initialize values
 }
 // Increment count of quadgrams/trigrams/unigrams scored
 void Tote::AddScoreCount() {
   ++score_count_;
 }
 void Tote::Add(uint8 ikey, int idelta) {
   int key_group = ikey >> 2;
   uint64 groupmask = (1ULL << key_group);
   if ((in_use_mask_ & groupmask) == 0) {
     // Initialize this group
     gscore_[key_group] = 0;
     in_use_mask_ |= groupmask;
   }
   score_[ikey] += idelta;
 }
 // Return current top three keys
 void Tote::CurrentTopThreeKeys(int* key3) const {
   key3[0] = -1;
   key3[1] = -1;
   key3[2] = -1;
   int score3[3] = {-1, -1, -1};
   uint64 tempmask = in_use_mask_;
   int base = 0;
   while (tempmask != 0) {
     if (tempmask & 1) {
       // Look at four in-use keys
       for (int i = 0; i < 4; ++i) {
         int insert_me = score_[base + i];
         // Favor lower numbers on ties
         if (insert_me > score3[2]) {
           // Insert
           int insert_at = 2;
           if (insert_me > score3[1]) {
             score3[2] = score3[1];
             key3[2] = key3[1];
             insert_at = 1;
             if (insert_me > score3[0]) {
               score3[1] = score3[0];
               key3[1] = key3[0];
               insert_at = 0;
             }
           }
           score3[insert_at] = insert_me;
           key3[insert_at] = base + i;
         }
       }
     }
     tempmask >>= 1;
     base += 4;
   }
 }
 // Take a set of <key, value> pairs and tote them up.
 // After explicitly sorting, retrieve top key, value pairs
 // 0xFFFF in key signifies unused
 DocTote::DocTote() {
   // No need to initialize score_ or value_
   incr_count_ = 0;
   sorted_ = 0;
   memset(closepair_, 0, sizeof(closepair_));
   memset(key_, 0xFF, sizeof(key_));
 }
 DocTote::~DocTote() {
 }
 void DocTote::Reinit() {
   // No need to initialize score_ or value_
   incr_count_ = 0;
   sorted_ = 0;
   memset(closepair_, 0, sizeof(closepair_));
   memset(key_, 0xFF, sizeof(key_));
   runningscore_.Reinit();
 }
 // Weight reliability by ibytes
 // Also see three-way associative comments above for Tote
 void DocTote::Add(uint16 ikey, int ibytes,
                               int score, int ireliability) {
   ++incr_count_;
   // Look for existing entry in top 2 positions of 3, times 8 columns
   int sub0 = ikey & 15;
   if (key_[sub0] == ikey) {
     value_[sub0] += ibytes;
     score_[sub0] += score;
     reliability_[sub0] += ireliability * ibytes;
     return;
   }
   // Look for existing entry in other of top 2 positions of 3, times 8 columns
   int sub1 = sub0 ^ 8;
   if (key_[sub1] == ikey) {
     value_[sub1] += ibytes;
     score_[sub1] += score;
     reliability_[sub1] += ireliability * ibytes;
     return;
   }
   // Look for existing entry in third position of 3, times 8 columns
   int sub2 = (ikey & 7) + 16;
   if (key_[sub2] == ikey) {
     value_[sub2] += ibytes;
     score_[sub2] += score;
     reliability_[sub2] += ireliability * ibytes;
     return;
   }
   // Allocate new entry
   int alloc = -1;
   if (key_[sub0] == kUnusedKey) {
     alloc = sub0;
   } else if (key_[sub1] == kUnusedKey) {
     alloc = sub1;
   } else if (key_[sub2] == kUnusedKey) {
     alloc = sub2;
   } else {
     // All choices allocated, need to replace smallest one
     alloc = sub0;
     if (value_[sub1] < value_[alloc]) {alloc = sub1;}
     if (value_[sub2] < value_[alloc]) {alloc = sub2;}
   }
   key_[alloc] = ikey;
   value_[alloc] = ibytes;
   score_[alloc] = score;
   reliability_[alloc] = ireliability * ibytes;
   return;
 }
 // Find subscript of a given packed language, or -1
 int DocTote::Find(uint16 ikey) {
   if (sorted_) {
     // Linear search if sorted
     for (int sub = 0; sub < kMaxSize_; ++sub) {
       if (key_[sub] == ikey) {return sub;}
     }
     return -1;
   }
   // Look for existing entry
   int sub0 = ikey & 15;
   if (key_[sub0] == ikey) {
     return sub0;
   }
   int sub1 = sub0 ^ 8;
   if (key_[sub1] == ikey) {
     return sub1;
   }
   int sub2 = (ikey & 7) + 16;
   if (key_[sub2] == ikey) {
     return sub2;
   }
   return -1;
 }
 // Return current top key
 int DocTote::CurrentTopKey() {
   int top_key = 0;
   int top_value = -1;
   for (int sub = 0; sub < kMaxSize_; ++sub) {
     if (key_[sub] == kUnusedKey) {continue;}
     if (top_value < value_[sub]) {
       top_value = value_[sub];
       top_key = key_[sub];
     }
   }
   return top_key;
 }
 // Sort first n entries by decreasing order of value
 // If key==0 other fields are not valid, treat value as -1
 void DocTote::Sort(int n) {
   // This is n**2, but n is small
   for (int sub = 0; sub < n; ++sub) {
     if (key_[sub] == kUnusedKey) {value_[sub] = -1;}
     // Bubble sort key[sub] and entry[sub]
     for (int sub2 = sub + 1; sub2 < kMaxSize_; ++sub2) {
       if (key_[sub2] == kUnusedKey) {value_[sub2] = -1;}
       if (value_[sub] < value_[sub2]) {
         // swap
         uint16 tmpk = key_[sub];
         key_[sub] = key_[sub2];
         key_[sub2] = tmpk;
         int tmpv = value_[sub];
         value_[sub] = value_[sub2];
         value_[sub2] = tmpv;
         double tmps = score_[sub];
         score_[sub] = score_[sub2];
         score_[sub2] = tmps;
         int tmpr = reliability_[sub];
         reliability_[sub] = reliability_[sub2];
         reliability_[sub2] = tmpr;
       }
     }
   }
   sorted_ = 1;
 }
 void DocTote::Dump(FILE* f) {
   fprintf(f, "DocTote::Dump\n");
   for (int sub = 0; sub < kMaxSize_; ++sub) {
     if (key_[sub] != kUnusedKey) {
       Language lang = static_cast<Language>(key_[sub]);
       fprintf(f, "[%2d] %3s %6dB %5dp %4dR,\n", sub, LanguageCode(lang),
               value_[sub], score_[sub], reliability_[sub]);
     }
   }
   fprintf(f, "  %d chunks scored<br>\n", incr_count_);
 }
 }       // End namespace CLD2

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browser/components/translation/cld2/internal/tote.cc@b8a032363ba2 (annotated)

browser/components/translation/cld2/internal/tote.cc