Evidential reasoning system and method

• US 6,951,008 B2
• Filed: 03/29/2001
• Issued: 09/27/2005
• Est. Priority Date: 03/29/2001
• Status: Expired due to Fees

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Quaile, James Patrick
• Primary Examiner(s): Khatri, Anil
• Application Number:
  US09/821,526
• Publication Number:
  US 20020165841A1
• Time in Patent Office: 1,643 Days
• Field of Search: 706 45- 47, 706/51, 706/52, 706/61, 706/54
• US Class Current: 706/54
• CPC Class Codes: G06N 5/048 Fuzzy inferencing

Abstract

Computerized method and system for making decisions based on evidential reasoning are provided. The method allows for providing a model structure; including a plurality of processing nodes. Each of the processing nodes is coupled to receive a set of inputs to supply a respective output. The method further allows for evaluating a respective attribute assigned to each of the plurality of processing nodes. A number of possible linguistic evidential values is specified for each of the attributes, wherein some of the evidential values comprise unknown information. A combining step allows for combining the outputs from the processing nodes to reach a decision even in the presence of unknown information.

Claims

1. A computerized method for making decisions based on evidential reasoning, said method comprising:

providing a model structure including a plurality of processing nodes, each of said processing nodes coupled to receive a set of inputs to supply a respective output;

evaluating a respective attribute assigned to each of the plurality of processing nodes;

specifying a number of possible linguistic evidential values for each of said attributes, wherein said evidential values comprise known information;

statistically emulating a number of possible linguistic evidential values for each of said attributes, wherein said evidential values comprise unknown information;

processing said known and said unknown information at said processing nodes to generate the outputs; and

combining the outputs supplied by said processing nodes to reach a decision that emulates expert data.

2. The computerized method of claim 1 wherein said model structure comprises a hierarchical model structure.

3. The computerized model of claim 2 wherein outputs from lower processing nodes are successively passed as inputs to higher level processing nodes until a final output is generated from the highest level processing node in the hierarchical model structure, said final output comprising said decision.

4. The computerized method of claim 1 wherein said expert data is collected during a learning stage from a plurality of examples far each of the processing nodes, each of the plurality of examples having a set of inputs, including some indicative of unknown information, and a corresponding output indicative of an expert opinion.

5. The computerized method of claim 4 wherein said plurality of examples is used during said learning stage to configure the processing nodes in the model structure to generate a final output from a given set of inputs, the model structure being configured so that said final output and the export opinion from the plurality of examples are statistically equivalent to one another.

6. The computerized method of claim 5 further comprising identifying expert opinion that deviates from a majority of the plurality of examples.

7. The computerized method of claim 6 further comprising adjusting said identified expert opinion to correct any deviations therein.

8. The computerized method of claim 7 further comprising reconfiguring the processing nodes to include any adjusted expert opinion.

9. The computerized method of claim 6 further comprising disregarding said identified expert opinion to remove any deviations therein.

10. The computerized method of claim 9 further comprising reconfiguring the processing nodes omitting any disregarded expert opinion.

11. The computerized method of claim 1 further comprising making the model structure available over a global communications network during a production stage for processing financial service applications.

12. A computerized method for making decisions based on evidential reasoning, said decisions used for risk and credit analysis of financial service applications, said method comprising:

providing a hierarchical model structure for performing risk and credit analysis of financial service applications, said model structure including at least one input layer of processing nodes, said model further including an output layer having a processing node coupled to each of the processing nodes in the input layer;

evaluating a respective attribute indicative of a risk factor assigned to each of the plurality of processing nodes;

specifying a number of possible linguistic evidential values for each of said attributes and wherein said evidential values comprise known financial information;

statistically emulating a number of possible linguistic evidential values for each of said attributes, wherein said evidential values comprise unknown financial information;

processing said known and said unknown information at said processing nodes to generate the outputs; and

combining the outputs supplied by said processing nodes to reach a decision regarding a given financial service application that emulates expert data, wherein said expert data is collected during a learning stage from a plurality of examples for each of the processing nodes, each of the plurality of examples having a set of inputs, including some indicative of unknown financial information, and a corresponding output indicative of an expert opinion.

13. The computerized method of claim 12 wherein said plurality of examples comprises a plurality of hypothetical examples.

14. The computerized method of claim 12 wherein said plurality of examples comprises historical data from previously processed applications.

15. The computerized method of claim 12 wherein said plurality of examples is used during said learning stage to configure the processing nodes in the model structure to generate a final output from a set of inputs, the model structure being configured so that said final output and the expert opinion for the plurality of examples are statistically equivalent to one another.

16. The computerized method of claim 15 wherein said model structure is configured to provide a plurality of non-overlapping intervals over its possible output space, said model structure being further configured to optimize separation between any adjacent intervals of said possible output space so that said final output unambiguously maps into a single interval of said output space.

17. A computer-readable medium encoded with computer program code for making decisions based on evidential reasoning, said decisions used for risk and credit analysis of financial service applications, the program code causing a computer to execute a method comprising:

running a hierarchical model structure for performing risk and credit analysis of financial service applications, said model structure including at least one input layer of processing nodes, said model further including an output layer having a processing node coupled to each of the processing nodes in the input layer;

evaluating a receptive attribute indicative of a risk factor assigned to each of the plurality of processing nodes;

specifying a number of possible linguistic evidential values for each of said attributes and wherein said evidential values comprise known financial information;

statistically emulating a number of possible linguistic evidential values for each of said attributes, wherein said evidential values comprise unknown financial information;

processing said known and said unknown information at said processing nodes to generate the outputs; and

combining the outputs supplied by said processing nodes to reach a decision regarding a given financial service application that emulates expert data, wherein said expert data is collected during a learning stage from a plurality of examples for each of the processing nodes, each of the plurality of examples having a set of inputs, including some indicative of unknown financial information, and a corresponding output indicative of an expert opinion, said model structure configured to provide a plurality of non-overlapping intervals over its possible output space, said model structure being further configured to optimize separation between any adjacent intervals of said possible output space so that its final output unambiguously maps into a single interval of said output space.

18. The computer-readable medium of claim 17 wherein said model structure is accessible in a production stage over a global communications network.

19. The computer-readable medium of claim 18 wherein said global communications network comprises the Internet.

20. A computerized system for making decisions based on evidential reasoning, said decisions used for risk and credit analysis of financial service applications, said system comprising:

memory configured to store a hierarchical model structure for performing risk and credit analysis of financial service applications, said model structure including at least one input layer of processing nodes, said model further including an output layer having a processing node coupled to each of the processing nodes in the input layer;

an evaluator module configured to evaluate a respective attribute indicative of a risk factor assigned to each of the plurality of processing nodes;

a data entry module configured to specify a number of possible linguistic evidential values for each of said attributes, wherein said evidential values comprise known financial information, and statistically emulate a number of possible linguistic evidential values for each of said attributes, wherein said evidential values comprise unknown financial information; and

a processor configured to process said known and said unknown information at said processing nodes to generate outputs and combine the outputs supplied by said processing nodes to reach a decision regarding a given financial service application that emulates expert data, wherein said expert data is collected during a learning stage from a plurality of examples for each of the processing nodes, each of the plurality of examples having a set of inputs, including some indicative of unknown financial information, and a corresponding output indicative of an expert opinion.