| namespace lm { namespace builder { | |
| class Output; | |
| struct PipelineConfig { | |
| std::size_t order; | |
| util::stream::SortConfig sort; | |
| InitialProbabilitiesConfig initial_probs; | |
| util::stream::ChainConfig read_backoffs; | |
| // Estimated vocabulary size. Used for sizing CorpusCount memory and | |
| // initial probing hash table sizing, also in CorpusCount. | |
| lm::WordIndex vocab_estimate; | |
| // Minimum block size to tolerate. | |
| std::size_t minimum_block; | |
| // Number of blocks to use. This will be overridden to 1 if everything fits. | |
| std::size_t block_count; | |
| // n-gram count thresholds for pruning. 0 values means no pruning for | |
| // corresponding n-gram order | |
| std::vector<uint64_t> prune_thresholds; //mjd | |
| bool prune_vocab; | |
| std::string prune_vocab_file; | |
| /* Renumber the vocabulary the way the trie likes it? */ | |
| bool renumber_vocabulary; | |
| // What to do with discount failures. | |
| DiscountConfig discount; | |
| // Compute collapsed q values instead of probability and backoff | |
| bool output_q; | |
| /* Computing the perplexity of LMs with different vocabularies is hard. For | |
| * example, the lowest perplexity is attained by a unigram model that | |
| * predicts p(<unk>) = 1 and has no other vocabulary. Also, linearly | |
| * interpolated models will sum to more than 1 because <unk> is duplicated | |
| * (SRI just pretends p(<unk>) = 0 for these purposes, which makes it sum to | |
| * 1 but comes with its own problems). This option will make the vocabulary | |
| * a particular size by replicating <unk> multiple times for purposes of | |
| * computing vocabulary size. It has no effect if the actual vocabulary is | |
| * larger. This parameter serves the same purpose as IRSTLM's "dub". | |
| */ | |
| uint64_t vocab_size_for_unk; | |
| /* What to do the first time <s>, </s>, or <unk> appears in the input. If | |
| * this is anything but THROW_UP, then the symbol will always be treated as | |
| * whitespace. | |
| */ | |
| WarningAction disallowed_symbol_action; | |
| const std::string &TempPrefix() const { return sort.temp_prefix; } | |
| std::size_t TotalMemory() const { return sort.total_memory; } | |
| }; | |
| // Takes ownership of text_file and out_arpa. | |
| void Pipeline(PipelineConfig &config, int text_file, Output &output); | |
| }} // namespaces | |