net.predictFcn produces 'Argument to dynamic structure reference must evaluate to a valid field name.'

Question

Stephen Gray 2023-7-18

0
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https://ww2.mathworks.cn/matlabcentral/answers/1997488-net-predictfcn-produces-argument-to-dynamic-structure-reference-must-evaluate-to-a-valid-field-name

回答： Stephen Gray 2023-7-18

The following code works great, i.e. I get the correct result an d a good performance score. How ever when I use the net.predictFcn on a new matrix or in fact on the trining data I get the 'Argument to dynamic structure reference must evaluate to a valid field name.' error. I've looked at other example from people who have got the same error but cannot work out the issue. The code snippit is :-

Inps = readtable("D:\RacingFormBook\Res.xlsx", opts, "UseExcel", false);
%% Clear temporary variables
clear opts
Outs=Inps(:,11);
Inps = removevars(Inps, 'FPos');
OutsM=table2array(Outs);
OutsM=OutsM';
%Convert catergorical to numeric next using unique
[GN, ~, CourseC] = unique(Inps(:,3));
[GN, ~, GoingC] = unique(Inps(:,4));
[GN, ~, HorseC] = unique(Inps(:,5));
[GN, ~, JockeyC] = unique(Inps(:,6));
[GN, ~, TrainerC] = unique(Inps(:,9));
Inps = removevars(Inps, {'Course','Going','HorseName','Jockey','Trainer'});
InpsM = table2array(Inps);
InpsMC=cat(2,InpsM,CourseC,GoingC,HorseC,JockeyC,TrainerC);
InpsMC=InpsMC';
clear GoingC HorseC TrainerC CourseC JockeyC GN Inps Outs InpsM
InpsMCG=gpuArray(InpsMC);
OutsMG=gpuArray(OutsM);
net=feedforwardnet([60,30,1]);
net.trainFcn = 'trainscg';
net=train(net,InpsMCG,OutsMG);