WO2009120449A1 - Intra-language statistical machine translation - Google Patents
Intra-language statistical machine translation Download PDFInfo
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- WO2009120449A1 WO2009120449A1 PCT/US2009/035389 US2009035389W WO2009120449A1 WO 2009120449 A1 WO2009120449 A1 WO 2009120449A1 US 2009035389 W US2009035389 W US 2009035389W WO 2009120449 A1 WO2009120449 A1 WO 2009120449A1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F40/00—Handling natural language data
- G06F40/40—Processing or translation of natural language
- G06F40/42—Data-driven translation
- G06F40/44—Statistical methods, e.g. probability models
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F40/00—Handling natural language data
- G06F40/40—Processing or translation of natural language
- G06F40/42—Data-driven translation
- G06F40/45—Example-based machine translation; Alignment
Definitions
- Voice search involves a coupling of voice recognition and information retrieval. An uttered phrase is automatically recognized as text, and the text is submitted as a query to a search service. For example, a person may use a mobile phone equipped with a voice search application to find a restaurant by speaking the name of the restaurant into the mobile device, and the mobile device may recognize the spoken restaurant name (i.e., convert it to text) and transmit the text of the restaurant name to a remote search service such as a business directory.
- Local search is a special case of search where listings of business establishments, firms, organizations, or other entities have been used to enable mobile devices to search same. Consider the following example.
- a user may be interested in finding information about a business listed in a directory as "Kung Ho Cuisine of China". However, the user formulates a query as "Kung Ho Restaurant". Currently, a search for this listing will not take advantage of statistical parallels between parts of the query and listing forms. Furthermore, erroneous listings, e.g. "Kung Ho Grocery" may be returned as a relevant match.
- Training data may be provided.
- the training data may include pairs of source phrases and target phrases.
- the pairs may be used to train an intra-language statistical machine translation model, where the intra-language statistical machine translation model, when given an input phrase of text in the human language, can compute probabilities of semantic equivalence of the input phrase to possible translations of the input phrase in the human language.
- the statistical machine translation model may be used to translate between queries and listings.
- the queries may be text strings in the human language submitted to a search engine.
- the listing strings may be text strings of formal names of real world entities that are to be searched by the search engine to find matches for the query strings.
- Figure 1 shows a general process for intra-language statistical machine translation.
- Figure 2 shows a process for building an n-gram based model.
- Figure 3 shows an arrangement for using a statistical translation model to improve a search system and/or the language model of a voice recognition system.
- a statistical translation model is a generalization of some sample of text, which may be parallel phrases such as a query strings and corresponding directory listings. Some types of statistical translation models give probabilities that a target sentence or phrase is a translation of a source sentence or phrase, and the probabilities reflect the statistical patterns derived from the training text. In effect, the model is a probabilistic generalization of characteristics or trends reflected from statistical measurements of training sentences.
- Figure 1 shows a general process for intra-language statistical machine translation. Initially, a statistical machine translation model is trained 1 00. Training 1 00 will be described in detail later.
- the training 1 00 is performed using a sample of training data, which may come from a variety of sources.
- the training data will include parallel (paired) phrases in a same human language.
- the training 1 00 informs the translation model with statistics (e.g., n-grams) that can be used to compute probabilities or likelihoods of candidate translations of a phrase. Specific training 1 00 for an n-gram based model will be described below.
- the model is used to translate 1 02 a source phrase into a target phrase.
- Translation 1 02 involves starting with a source phrase and obtaining a semantically similar or equivalent target phrase. For example, a source phrase "Kung Ho Cuisine of China" might be translated to a target phrase "Kung Ho Chinese Restaurant” or "Kung Ho Restaurant” Different forms of candidate target phrases are obtained.
- the statistical translation model is used to find one or more of the most probable candidate target phrases.
- a voice search system may involve two components: a voice recognition component and an information retrieval (search) component.
- Statistical LMs e.g. n-gram models, are often used to allow flexibility in what users can say. That is, they allow a variety of sayings to be recognized by the ASR component.
- documents d may be in the form of business listings (names of business, organizations, or other entities), which are typically short, e.g. "Kung Ho Cuisine of China”.
- listings and queries because they are both relatively short, are treated as pairs akin to "sentence pairs" found in bilingual translation training.
- a bilingual statistical translation model adapted for intra-language translation, may be used to automatically convert the original form of a listing to its query forms (i.e., the forms that a user might be expected to input when searching for the listing), which in turn may be used for building more robust LMs for voice search, grammar checking, or other applications.
- the statistical translation model may be trained using a small number of transcribed or artificially produced queries, without necessarily having to acquire matching listings. While a variety of types of statistical models can be used for machine translation, an n-gram based model will be described next.
- a query phrase and its intended listing phrase may differ in form, there is usually a semantic correspondence, at the word level, between the two phrases.
- words in the query can be mapped to words in the listing or to a null word, and vice versa.
- a machine translation approach may be used to predict possible query forms of a listing, and then to utilize the predicted query forms to improve language modeling.
- n-grams may be used on word pairs to model the joint (conditional) probability of a listing and a query.
- Figure 2 shows a process for building an n-gram based model.
- a pair of source and target sentences in a same human language are received 1 20.
- An alignment between the source and target sentences is obtained 1 22 by computing an edit distance between the two sentences.
- Words and/or phrases of the aligned sentences are then paired 1 24 and treated as semantic units. Pairings may be formed by finding semantically/literally similar/equivalent words or phrases.
- the pairings are then used to train 1 26 an n-gram model. The steps of this process may be repeated for different source and target sentences. While a small set of training sentences may suffice for some applications, using more training data will create a more robust model.
- initial training data is provided.
- This data may be a body of parallel text (d, q), where listings d and queries q serve as source and target sentences respectively.
- the sentences d and q may be monotonically aligned, where null words are added, if necessary, to account for insertions or deletions that occur in the alignment.
- the monotonic alignment will be denoted as a. Note that in another embodiment, a non-monotonic alignment may be used.
- a listing-to-query translation may be performed. Given a listing form d, and given query forms q (from a decoder, discussed later), the query forms are searched to find those that have the highest conditional probability: q * « max q max ⁇ p M (d, q, ⁇ ) (4) where p(d, q, a) is evaluated using equation (3).
- the translation not only exploits word-level semantic correspondence as modeled by unigrams, but it also takes into account word context by using higher order n- grams.
- the search for the best or n-best query forms can be achieved efficiently by applying the best-first search algorithm, which is described by Russell and Norvig in Artificial Intelligence: A Modern Approach (Prentice Hall, second edition, 2003). Using this type of search, pruning techniques may be applied to reduce computational complexity.
- LM language model
- the n-best query forms are obtained for the listings, they may be used as training sentences for LM estimation.
- null words in d raises a potential problem at decode time — the search space is significantly expanded because null can be present or absent at any position of the source sentence.
- it is preferable to eliminate the use of (d, null, q,) as semantic units for values of q,.
- q.-iq,) or (d, + i , q,q ⁇ + i) may be treated as a single semantic unit.
- null is not explicitly inserted in d, because using semantic units (d,-i, q,-i q,) or (d, + i, q,q ⁇ + i) is equivalent to adding null in the source sentence.
- OOV out-of-vocabulary
- a re-ordering strategy may be used. This may be implemented before a monotonic alignment is applied by reordering d while keeping the order of q.
- the best way to reorder the words in the source form is determined by computing the resulting joint n-gram model likelihood. Only orders that are shifts of the original order are considered, and a maximum entropy classifier for these orders is built, where the input of the classifier is the source form, and the output is an order. Prior to translation, this classifier is applied to reorder a source form.
- Figure 3 shows an arrangement for using a statistical translation model to improve a search system and/or the language model of a voice recognition system.
- a search engine 1 52 is configured to search listings 1 54, for example business listings.
- the search engine 1 52 receives text queries or transcribed spoken queries 1 56 that are generated by users and submitted to the search engine 1 52.
- Corresponding relevant listings 1 58 are retrieved by the search engine 1 52.
- training pairs can also be obtained algorithmically using TF-IDF (term frequency-inverse document frequency).
- the text or transcribed queries 1 56 and corresponding search-engine retrieved listings 1 58 are passed to a training component 1 60 that trains a statistical translation model 1 62, which may be n-gram based or another type of model.
- a statistical translation model 1 62 which may be n-gram based or another type of model.
- the training component 1 60 iterates through source-target pairs of the transcribed queries 1 56 and listings 1 58.
- an n-gram based model given a (source, target) pair, an initial monotonic alignment is obtained between the source form and target form by computing an edit distance. Given the alignment, the training component 1 60 discovers word-level pairs and builds an n-gram translation model 1 62 based on the word- level pairs.
- the alignment and n-gram model parameters of the translation model 1 62 may be iteratively refined to improve the translation model 1 62. Furthermore, training may implement a backoff strategy which assumes that a word can be translated to itself, as is possible with intra-language translation. In other words, the aligned units WORD-WORD, where WORD can be a word or a phrase, will have a positive probability.
- a translation module 1 64 uses the translation model 1 62 to test decoded candidates (potential translations). Given the trained translation model 1 62 and a source form, a best-first search algorithm may be used to obtain the top n-best target forms (the n decoded target forms with the highest probability according to the translation model 1 62).
- the weight of each target form is determined by p(target
- d) s(q, x) ⁇ . Alternatively, relevancy may be measured directly from the translation probability, in which case s(q, d) p(q,d). In one embodiment, potential translations can be filtered out if their similarity measure is below a specified threshold.
- a language model 1 68 can also be built or augmented using intra-language translation.
- Language models are used in many natural language processing applications such as ASR, machine translation, and parsing.
- the intra-language translation provided by the translation model 1 62 and translation module 1 64 may be used in language modeling by translating listings into query forms and using the same-language translated query forms when estimating a language model 1 68.
- the count of a translated query form may be set to its posterior probabilities multiplied by the count of its original listing.
- a server- or client-based voice recognizer may be provided with the language model 1 68, which will allow the voice recognizer to perform more accurate and comprehensive speech recognition with respect to utterances directed to the listings 1 54 or to listings.
- the translation model 1 62 may also be used at a server or at a mobile client to translate a string inputted at the mobile device (whether by ASR or otherwise) to a display form.
- Embodiments and features discussed above can be realized in the form of information stored in volatile or non-volatile computer or device readable media. This is deemed to include at least media such as optical storage (e.g., CD-ROM), magnetic media, flash ROM, or any current or future means of storing digital information.
- the stored information can be in the form of machine executable instructions (e.g., compiled executable binary code), source code, bytecode, or any other information that can be used to enable or configure computing devices to perform the various embodiments discussed above.
- This is also deemed to include at least volatile memory such as RAM and/or virtual memory storing information such as CPU instructions during execution of a program carrying out an embodiment, as well as non-volatile media storing information that allows a program or executable to be loaded and executed.
- volatile memory such as RAM and/or virtual memory storing information such as CPU instructions during execution of a program carrying out an embodiment
- non-volatile media storing information that allows a program or executable to be loaded and executed.
- the embodiments and featured can be performed on any type of computing device, including portable devices, workstations, servers, mobile wireless devices, and so on.
- the modules, components, processes, and search engine 1 52 discussed above may by realized on one computing device or multiple cooperating computing devices.
Abstract
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EP09725780.2A EP2269148B1 (en) | 2008-03-28 | 2009-02-27 | Intra-language statistical machine translation |
CN200980112180.XA CN101981566B (en) | 2008-03-28 | 2009-02-27 | Intra-language statistical machine translation |
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US12/058,328 US8615388B2 (en) | 2008-03-28 | 2008-03-28 | Intra-language statistical machine translation |
US12/058,328 | 2008-03-28 |
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EP (1) | EP2269148B1 (en) |
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US8615388B2 (en) | 2013-12-24 |
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