By Keith PLEDGER
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Additional info for Edexcel As and a Level Modular Mathematics Core Mathematics
Generally, for a given application, the architecture of an RNN is either chosen randomly or based on user’s experience. The user then tries a large number of structures for the selected architecture and the parameters for each of these structures. The difﬁculty in making optimal choices for these properties has limited the application of RNNs in spite of its vast potential. Some details about the determination of these properties of an RNN will be provided in the coming sections along with possible issues for future work.
Xn is a fuzzy subset on the Cartesian product space X1 Â X2 Â Á Á Á Â Xn and can be denoted by R(X1, X2, . . , Xn) as ð RðX1 , X2 , . . , Xn Þ ¼ mR ðx1 , x2 , . . , xn Þ=ðx1 , x2 , . . , xn Þ (2:28) X1 ÂX2 ÂÁÁÁÂXn where mR (x1, x2, . . , xn) is a MF of the relation R, which represents the degree of association (correlation) among the elements of the different domain Xi. It is a mapping from the Cartesian space X1 Â X2 Â Á Á Á Â Xn onto a continuous unit interval [0, 1] as R: X1 Â X2 Â Á Á Á Â Xn !
F½mA0 ðxÞ ^ mB0 ðyÞ ^ mRl ðx, y, zÞgÞ x,y,z x,y ¼ [ ðf½mA0 ðxÞ ^ mB0 ðyÞ mR1 ðx, y, zÞg, .. ,f½mA0 ðxÞ ^ mB0 ðyÞ mRl ðx, y, zÞgÞ x,y,z l ¼ [ f½mA0 ðxÞ ^ mB0 ðyÞ mRi ðx, y, zÞg i¼1 ß 2008 by Taylor & Francis Group, LLC. (2:65) where mRi(x, y, z) ¼ mAi(x) ^ mBi(y) ^ mCi(z). If the input variables are fuzzy singletons as A0 ¼ x0 and B0 ¼ y0, then the ﬁring strength ai of the ith rule is expressed as ai ¼ mAi(x0) ^ mBi(y0), which is a measure of the contribution of the ith rule to the resultant fuzzy output.