A plant model management device according to one embodiment includes a generation unit and a combining unit. The generation unit receives a first set of prior probability distributions of a first set of automatic operation parameters. The first set of automatic operation parameters define a condition required for modeling a plant model that is a model based on data concerning a plant. The generation unit generates a first set of posterior probability distributions of the first set of automatic operation parameters and a first set of probabilistic plant models based on the first set of prior probability distributions. The first set of posterior probability distributions reflect compatibility with learning data that is past time-series data concerning a first explanatory variable and a first objective variable. The combining unit combines the first set of probabilistic plant models using the first set of posterior probability distributions to generate a first plant model.
Please help me write a proper abstract based on the patent claims. CLAIM: 1. A plant model management device comprising: a generation unit configured to receive a first set of prior probability distributions of a first set of automatic operation parameters, the first set of automatic operation parameters defining a condition required for modeling a plant model, and the plant model being a model based on data concerning a plant, and generate a first set of posterior probability distributions of the first set of automatic operation parameters and a first set of probabilistic plant models based on the first set of prior probability distributions, the first set of posterior probability distributions reflecting compatibility with learning data, and the learning data being past time-series data concerning a first explanatory variable and a first objective variable; and a combining unit configured to combine the first set of probabilistic plant models using the first set of posterior probability distributions to generate a first plant model. 2. The plant model management device according to claim 1, further comprising: a prediction unit configured to calculate, using the first plant model, a first predicted value of a second objective variable with respect to a second explanatory variable, and a first probability distribution of the first predicted value. 3. The plant model management device according to claim 2, further comprising: a maintenance unit configured to verify validity of the first plant model using the first probability distribution and a first actual value of the second objective variable, update a first weight used to a second weight in a case that the first plant model is determined to be valid, the first weight being used for the combining unit to combine the first set of probabilistic plant models, and cause the combining unit to recombine the first set of probabilistic plant models using the second weight to generate a second plant model. 4. The plant model management device according to claim 3, wherein the prediction unit is configured to: calculate, using the second plant model, a second predicted value of the second objective variable and a second probability distribution of the second predicted value. 5. The plant model management device according to claim 3, wherein the maintenance unit is configured to, in a case that the first plant model is determined to be invalid, cause the generation unit to receive a second set of prior probability distributions of a second set of automatic operation parameters, and generate a second set of posterior probability distributions of the second set of automatic operation parameters and a second set of probabilistic plant models based on the second set of prior probability distributions, the second set of posterior probability distributions reflecting compatibility with learning data, and the combining unit is configured to combine the second set of probabilistic plant models using the second set of posterior probability distributions to generate a third plant model. 6. The plant model management device according to claim 2, further comprising: an input/output unit configured to receive the first set of prior probability distribution and output the first set of probability distributions. 7. The plant model management device according to claim 1, wherein the generation unit comprises: a modeling unit configured to generate the first set of probabilistic plant models using the learning data and calculate a first set of likelihoods with respect to the first set of automatic operation parameters; and a modeling simulation unit configured to receive the first set of prior probability distributions, output the first set of automatic operation parameters sequentially to the modeling unit to obtain the first set of probabilistic plant models, and generate the first set of posterior probability distributions based on the first set of likelihoods. 8. A plant model management method comprising: receiving a first set of prior probability distributions of a first set of automatic operation parameters, the first set of automatic operation parameters defining a condition required for modeling a plant model, and the plant model being a model based on data concerning a plant, and generating a first set of posterior probability distributions of the first set of automatic operation parameters and a first set of probabilistic plant models based on the first set of prior probability distributions, the first set of posterior probability distributions reflecting compatibility with learning data, and the learning data being past time-series data concerning a first explanatory variable and a first objective variable; and combining the first set of probabilistic plant models using the first set of posterior probability distributions to generate a first plant model. 9. The plant model management method according to claim 8, further comprising: calculating, using the first plant model, a first predicted value of a second objective variable with respect to a second explanatory variable, and a first probability distribution of the first predicted value. 10. The plant model management method according to claim 9, further comprising: verifying validity of the first plant model using the first probability distribution and a first actual value of the second objective variable, updating a first weight used to a second weight in a case that the first plant model is determined to be valid, the first weight being used for combing the first set of probabilistic plant models, and recombining the first set of probabilistic plant models using the second weight to generate a second plant model. 11. The plant model management method according to claim 10, further comprising: calculating, using the second plant model, a second predicted value of the second objective variable and a second probability distribution of the second predicted value. 12. The plant model management device according to claim 10, further comprising: in a case that the first plant model is determined to be invalid, receiving a second set of prior probability distributions of a second set of automatic operation parameters; generating a second set of posterior probability distributions of the second set of automatic operation parameters and a second set of probabilistic plant models based on the second set of prior probability distributions, the second set of posterior probability distributions reflecting compatibility with learning data; and combining the second set of probabilistic plant models using the second set of posterior probability distributions to generate a third plant model. 13. The plant model management device according to claim 8, wherein generating the first set of posterior probability distributions and the first set of probabilistic plant models comprises: generating the first set of probabilistic plant modes using the learning data; calculating a first set of likelihoods with respect to the first set of automatic operation parameters; and generating the first set of posterior probability distributions based on the first set of likelihoods. 14. A method comprising: sampling a first set of parameters from a first parameter; generating a first set of probabilistic plant models from the first set of parameters; calculating a first weight based on the first set of probabilistic plant models; combining the first set of probabilistic plant models using the first weight to generate a first plant model; calculating, using the first plant model, a first predicted value of a first objective variable with respect to a first explanatory variable; verifying validity of the first plant model based on the first predicted value and a first measured value of the first objective variable, the first measured value being a first value of the first objective variable actually measured; updating the first weight to a second weight in a case that the first plant model is determined to be valid; recombining the first set of probabilistic plant model using the second weight to generate a second plant model; and calculating, using the second plant model, a second predicted value of the first objective variable. 15. The method according to claim 14, further comprising: in a case that the first plant model is determined to be invalid, sampling a second set of parameters from a second parameter; generating a second set of probabilistic plant models based on the second set of parameters; calculating a third weight based on the second set of probabilistic plant models; combining the second set of probabilistic plant models using the third weight to generate a third plant model; and calculating, using the third plant model, a third predicted value of the first objective variable. 16. The method according to claim 14, wherein sampling the first set of parameters comprises: receiving a first prior probability distribution of the first parameter; and sampling the first set of parameters based on the first prior probability distribution. 17. The method according to claim 14, wherein generating the first set of probabilistic plant models further comprises: generating a first set of likelihoods with respect to the first set of parameters. 18. The method according to claim 17, wherein calculating the first weight comprises: calculating a first set of posterior probability distributions of the first set of parameters based on the first set of likelihoods; and calculating the first weight based on the first set of posterior probability distributions. 19. The method according to claim 14, wherein calculating the first predicated value comprises: calculating a first probability distribution of the first predicated value. 20. The method according to claim 19, wherein verifying the validity of the first plant model comprises: calculating a first likelihood of the first predicted value based on the first probability distribution and the first measured value; and verifying based on the first likelihood whether or not the first plant model is deteriorated.