A MODULAR APPROACH TO SIMULATION WITH AUTOMATIC SENSITIVITY CALCULATION

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When using simulation codes, one often has the task of minimizing a scalar objective function with respect to numerous parameters. This situation occurs when trying to fit (assimilate) data or trying to optimize an engineering design. For simulations in which the objective function to be minimized is reasonably well behaved, that is, is differentiable and does not contain too many multiple minima, gradient-based optimization methods can reduce the number of function evaluations required to determine the minimizing parameters. However, gradient-based methods are only advantageous if one can efficiently evaluate the gradients of the objective function. Adjoint differentiation efficiently provides these ... continued below

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107 Kilobytes pages

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HANSON, K. & CUNNINGHAM, G. February 1, 2001.

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When using simulation codes, one often has the task of minimizing a scalar objective function with respect to numerous parameters. This situation occurs when trying to fit (assimilate) data or trying to optimize an engineering design. For simulations in which the objective function to be minimized is reasonably well behaved, that is, is differentiable and does not contain too many multiple minima, gradient-based optimization methods can reduce the number of function evaluations required to determine the minimizing parameters. However, gradient-based methods are only advantageous if one can efficiently evaluate the gradients of the objective function. Adjoint differentiation efficiently provides these sensitivities. One way to obtain code for calculating adjoint sensitivities is to use special compilers to process the simulation code. However, this approach is not always so ''automatic''. We will describe a modular approach to constructing simulation codes, which permits adjoint differentiation to be incorporated with relative ease.

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107 Kilobytes pages

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  • Report No.: LA-UR-01-802
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 774512
  • Archival Resource Key: ark:/67531/metadc721338

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  • February 1, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • March 22, 2016, 9:03 p.m.

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HANSON, K. & CUNNINGHAM, G. A MODULAR APPROACH TO SIMULATION WITH AUTOMATIC SENSITIVITY CALCULATION, article, February 1, 2001; New Mexico. (digital.library.unt.edu/ark:/67531/metadc721338/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.