A systolic array architecture computer (FXCQ) has been designed for signal processing. R can handle floating point data at very high speed. It is composed of 16 processing cells and a cache that are connected linearly...A systolic array architecture computer (FXCQ) has been designed for signal processing. R can handle floating point data at very high speed. It is composed of 16 processing cells and a cache that are connected linearly and form a ring structure. All processing cells are identical and programmable. Each processing cell has the peak performance of 20 million floating-point operations per second (20MFLOPS). The machine therefore has a peak performance of 320 M FLOPS. It is integrated as an attached processor into a host system through VME bus interface. Programs for FXCQ are written in a high-level language -B language, which is supported by a parallel optimizing compiler. This paper describes the architecture of FXCQ, B language and its compiler.展开更多
The performance of a machine translation system heavily depends on the quantity and quality of the bilingual language resource. However,getting a parallel corpus,which has a large scale and is of high quality,is a ver...The performance of a machine translation system heavily depends on the quantity and quality of the bilingual language resource. However,getting a parallel corpus,which has a large scale and is of high quality,is a very difficult task especially for low resource languages such as Chinese-Vietnamese. Fortunately,multilingual user generated contents（ UGC）,such as bilingual movie subtitles,provide us access to automatic construction of the parallel corpus. Although the amount of UGC parallel corpora can be considerable,the original corpus is not suitable for statistical machine translation（ SMT） systems. The corpus may contain translation errors,sentence mismatching,free translations,etc. To improve the quality of the bilingual corpus for SMT systems,three filtering methods are proposed： sentence length difference,the semantic of sentence pairs,and machine learning. Experiments are conducted on the Chinese to Vietnamese translation corpus.Experimental results demonstrate that all the three methods effectively improve the corpus quality,and the machine translation performance（ BLEU score） can be improved by 1. 32.展开更多
This paper describes theoretical and practical aspects of a partial evaluator that treats a parallel lambda language. The parallel language presented is a combination of lambda calculus and message passing communicati...This paper describes theoretical and practical aspects of a partial evaluator that treats a parallel lambda language. The parallel language presented is a combination of lambda calculus and message passing communication mechanism. This parallel language can be used to write a programming language's denotational semantics which extracts the parallelism in the program. From this denotational definition of the programming language, the partial evaluator can generate parallel compiler of the language by self application.The key technique of partial evaluation is binding time analysis that determines in advance which parts of the source program can be evaluated during partial evaluation, and which parts cannot. A binding time analysis is described based upon type inference. A new type chcode is introduced into the type system, which denotes the type of those expressions containing residual channel operations. A well-formedness criterion is given which ensures that partial evaluation not only doesn't commit type errors but also doesn't change the sequence of channel operations. Before binding time analysis, channel analysis is used to analyze the communication relationship between send and receive processes.展开更多
The distributed computer system described in this paper is a set of computernodes interconnected in an interconnection network via packet-switching interfaces.The nodes communicate with each other by means of message-...The distributed computer system described in this paper is a set of computernodes interconnected in an interconnection network via packet-switching interfaces.The nodes communicate with each other by means of message-passing protocols. Thispaper presents the implementation of rendezvous facilities as highlevel prhoitives provided by a parallel programming language to support interprocess cornmunication andsynchronisation.展开更多
文摘A systolic array architecture computer (FXCQ) has been designed for signal processing. R can handle floating point data at very high speed. It is composed of 16 processing cells and a cache that are connected linearly and form a ring structure. All processing cells are identical and programmable. Each processing cell has the peak performance of 20 million floating-point operations per second (20MFLOPS). The machine therefore has a peak performance of 320 M FLOPS. It is integrated as an attached processor into a host system through VME bus interface. Programs for FXCQ are written in a high-level language -B language, which is supported by a parallel optimizing compiler. This paper describes the architecture of FXCQ, B language and its compiler.
基金Supported by the National Basic Research Program of China(973Program)(2013CB329303)the National Natural Science Foundation of China(61502035)
文摘The performance of a machine translation system heavily depends on the quantity and quality of the bilingual language resource. However,getting a parallel corpus,which has a large scale and is of high quality,is a very difficult task especially for low resource languages such as Chinese-Vietnamese. Fortunately,multilingual user generated contents（ UGC）,such as bilingual movie subtitles,provide us access to automatic construction of the parallel corpus. Although the amount of UGC parallel corpora can be considerable,the original corpus is not suitable for statistical machine translation（ SMT） systems. The corpus may contain translation errors,sentence mismatching,free translations,etc. To improve the quality of the bilingual corpus for SMT systems,three filtering methods are proposed： sentence length difference,the semantic of sentence pairs,and machine learning. Experiments are conducted on the Chinese to Vietnamese translation corpus.Experimental results demonstrate that all the three methods effectively improve the corpus quality,and the machine translation performance（ BLEU score） can be improved by 1. 32.
文摘This paper describes theoretical and practical aspects of a partial evaluator that treats a parallel lambda language. The parallel language presented is a combination of lambda calculus and message passing communication mechanism. This parallel language can be used to write a programming language's denotational semantics which extracts the parallelism in the program. From this denotational definition of the programming language, the partial evaluator can generate parallel compiler of the language by self application.The key technique of partial evaluation is binding time analysis that determines in advance which parts of the source program can be evaluated during partial evaluation, and which parts cannot. A binding time analysis is described based upon type inference. A new type chcode is introduced into the type system, which denotes the type of those expressions containing residual channel operations. A well-formedness criterion is given which ensures that partial evaluation not only doesn't commit type errors but also doesn't change the sequence of channel operations. Before binding time analysis, channel analysis is used to analyze the communication relationship between send and receive processes.
文摘The distributed computer system described in this paper is a set of computernodes interconnected in an interconnection network via packet-switching interfaces.The nodes communicate with each other by means of message-passing protocols. Thispaper presents the implementation of rendezvous facilities as highlevel prhoitives provided by a parallel programming language to support interprocess cornmunication andsynchronisation.
