Evolution Parsing Algorithm
The evolution parser works with partial parses of the text. It combines these partial parses into complete ones using the same process as the chart parser. This approach is more efficient than exhaustive search techniques.
The genetic algorithm uses a probabilistic grammar to generate sequences of links. It converges to an accurate parse in less than 500 generations. 에볼루션파워볼 커뮤니티
It is language independent
An evolutionary parser uses an optimization technique that selects the best individuals based on their performance. Individuals are evaluated by the length of the sentence segment parsed and by their depth in the parse tree. The rate of convergence varies with the size of the individuals and the number of words that are parsed.
The cut operator, which is responsible for extending the parses of an individual, selects a random subtree of the individual’s parse tree and adds it to a new individual. The new individual then has the potential to produce a deeper parse.
Evolutionary algorithms can be used to solve symbolic regression problems, which are difficult to solve using complete search techniques. Existing evolutionary algorithms for symbolic regression such as grammatical evolution (GE) use a binary string as a chromosome, which limits their utility. A new evolutionary algorithm, parse-matrix evolution (PME), uses a two-dimensional matrix with integer entries as its chromosome, and can retain more information. 에볼루션 파싱알
It is computationally efficient
Using evolutionary parsing, we can improve the performance of classic chart parsers that use exhaustive search techniques. However, these parsers still have many limitations, especially in terms of speed and accuracy. This is due to the fact that the grammars used are directly extracted from a corpus. As a result, the rules are too specific and impose a large computational burden on the system.
We propose a new evolutionary algorithm, called parse-matrix evolution (PME), that uses a two-dimensional matrix with integer entries as the chromosome representation of an individual. This approach allows us to keep more information and speeds up the parsing process. It also improves the accuracy of parsing, especially when compared to previous methods that used symbolic regression.
PME uses different genetic operators to produce new individuals that meet the criteria of the fitness function. These include the crossover and mutation operators, as well as the cut operator. The latter replaces a subtree of an individual with another one that parses a sequence of words that satisfy a grammar rule.
It is scalable
In addition to being scalable, evolutionary parsing offers other advantages. It can use partial parses instead of the complete arc extension used by chart parsers and it can work with different kinds of grammars. This allows it to avoid the problems of over-specificity encountered with some parsers based on exhaustive search techniques.
Evolutionary algorithms have been applied to natural language processing problems such as query translation, context-free parsing, part-of-speech tagging, and semantic interpretation. They provide a scalable, approximate solution to large problems that are impossible to solve using classical methods. They also reduce the error rate by limiting the number of possible parsing configurations. This approach has been shown to improve the performance of the parsers. However, the results can be misleading because they depend on how much information is stored in the chromosomes. Some of the issues that need to be addressed include incorporating constraints on solutions, and penalizing solutions with high error rates.
It is adaptable
In order to improve the parsing results, the algorithm uses a combination of genetic operators. The most important one is mutation, which randomly replaces the subtree corresponding to a certain category of a complete individual by another one. The new subtree must parse a sequence of words different from the old one and must not overlap with the preceding and following ones. This method improves the parsing results by reducing the search space.
Crossover is the second genetic operator and it works on both complete and incomplete individuals. It has a more significant effect on the search time than mutation. A conservative crossover is preferred because it provides better results than a more speculative one.
This evolutionary algorithm is used to parse medical documents, specifically radiology reports. It converges faster than traditional chart parsers that use exhaustive search techniques. It also improves the accuracy of the final parse. A preliminary experiment shows that it produces correct results for the majority of sentences in less than 500 generations.