McDermott asked . 2021-08-03

What is the cause of my patternnet apapt error?

I am trying to do adaptive training of a neural network using patternnet using all default settings, so the following is my complete code (except for array initialisation). The train code works, and is verified to produce accurate output :

X is [101,12507] of training data, T is [133,12507] of classification data

net = patternnet(101);
net = train(net,X,T);

If I try adaptive training with one sample :

X is [101,1] of training data, T is [133,1] of classification data

net = patternnet(101);
net = adapt(net,X,T);

I get the following error:

Error using  * 
Inner matrix dimensions must agree.
Error in nn7.grad2 (line 108)
      gNi(:,qq) = Fdot{qq}' * gA{i}(:,qq);
Error in adaptwb>adapt_network (line 100)
      [gB,gIW,gLW] =
      nn7.grad2(net,[],PD(:,:,ts),BZ,IWZ,LWZ,N,Ac(:,ts+AcInd),gE,Q,1,hints);
      Error in adaptwb (line 37)
    [out1,out2,out3] = adapt_network(in1,in2,in3,in4);
Error in network/adapt (line 108)
[net,Ac,tr] = feval(net.adaptFcn,net,Pd,T,Ai);
Error in D_Train_Net_Adapt (line 14)
    net = adapt(net,X,T);

patternnet adapt

Expert Answer

Prashant Kumar answered . 2024-12-21 13:19:53

% You are trying to design a classifier that classifies 101-dimensional vectors into one of 133 classes. using a net with 101 hidden nodes.

% What kind of input data is that and what kind of target classes are those?

% This is such a highly unusual and unlikely scenario that I suggest you illustrate your problem with a MATLAB example dataset.

% The documentation commands "help patternnet" and "doc patternnet" both yield examples using the iris_dataset containing fifty 4 dimensional vectors from each of 3 classes

% The help and doc commands for adapt indicate it was meant for timeseries, not classification. Nevertheless, it will be interesting to see how well it does.

% Removing ending semicolons will print the results of any command

 close all, clear all, clc
 [ x, t] = iris_dataset;
 [ I N ] = size(x)   % [ 4 150 ]
 [ O N ] = size(t)   % [ 3 150 ]
% TCI TrueClassIndices: 1, 2 and 3
 TCI = vec2ind(t);  
 H   = 10         % default No. of hidden nodes
% NET TRAINING
 net1 = patternnet(H);
 rng(4151941)       % my RNG initialization
 [ net1 tr y1 e1 ] = train(net1,x,t);
% PCI PredictedClassIndices: 1, 2 and 3
 PCI1    = vec2ind(y1);
 Errors1 = [ PCI1 ~= TCI ]; % 0s and 1s
 Nerrs1  = sum(Errors1)     %  4
 PctErr1 = 100*Nerrs1/N     % 2.67
% NET ADAPTATION
 net2 = patternnet(H);
 rng(4151941)       % my RNG initialization
 [ net2 y2 e2 xf af ar] = adapt(net2,x,t);
% PCI PredictedClassIndices: 1, 2 and 3
 PCI2     = vec2ind(y2);
 Errors2  = [ PCI2 ~= TCI ]; % 0s and 1s
 Nerrs2   = sum(Errors2)     %  91
 PctErr2 = 100*Nerrs2/N      % 60.7

% Since the initial weights and random data divisions depend on the RNG state, many more nets have to be designed before a definitive conclusion can be made about the ability of adapt to be used for this problem.

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