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• W2149520608 abstract "In this paper, making use of the signal-flow-graph (SFG) representation and its known properties, we derive a new general method for backward gradient computation of a system output or cost function with respect to past (or present) system parameters. The system can be any causal, in general nonlinear and time-variant dynamic system represented by a SFG, in particular any feedforward or recurrent neural network. In this work we use discrete time notation, but the same theory holds for the continuous time case. The gradient is obtained by the analysis of two SFGs, the original one and its adjoint. This method can be used both for online and off-line learning. In the latter case using the mean square error cost function, our approach particularises to Wan's method (1996) that is not suited for online training of recurrent networks. Computer simulations of nonlinear dynamic systems identification will also be presented to assess the performance of the algorithm resulting from the application of the proposed method in the case of locally recurrent neural networks." @default.
• W2149520608 created "2016-06-24" @default.
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• W2149520608 date "2002-11-22" @default.
• W2149520608 modified "2023-10-03" @default.
• W2149520608 title "Signal-flow-graph derivation of on-line gradient learning algorithms" @default.
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• W2149520608 doi "https://doi.org/10.1109/icnn.1997.614186" @default.
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