Reading MNIST : Error using fread Invalid file identifier. Use fopen to generate a valid file identifier.

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AHMED MAZARI
AHMED MAZARI 2018-2-16
回答： Hamza Mehboob 2018-10-22
Hello, l'm using MATLAB R2017b. l get error while reading MNIST dataset
Here is my function to read MNIST data
function [X_tr, X_te] = read_mnist(path_to_mnist)
D=10;
maxclasses=(0:D-1)';
[labels] = readidx(fullfile(path_to_mnist,'mnist','train-labels-idx1-ubyte'),60000,60000);
[xifres] = readidx(fullfile(path_to_mnist,'mnist','train-images-idx3-ubyte'),60000,60000);
X_tr = cell(D,1);
tmp32=zeros(32);
for d=1:D
sli=find(labels==maxclasses(d));
X_tr{d} = zeros(1024,length(sli));
for s=1:length(sli)
tmp=xifres(:,sli(s));
tmp32(3:30,3:30)=reshape(tmp,28,28);
X_tr{d}(:,s) = tmp32(:);
end
end
clear labels;
clear xifres;
[xifres] = readidx(fullfile(path_to_mnist,'mnist','t10k-images-idx3-ubyte'),10000,10000);
[labels] = readidx(fullfile(path_to_mnist,'mnist','t10k-labels-idx1-ubyte'),10000,10000);
X_te = cell(D,1);
for d=1:D
sli=find(labels==maxclasses(d));
X_te{d} = zeros(1024,length(sli));
for s=1:length(sli)
ind = 1+floor(rand(1)*length(sli)) ;
tmp=xifres(:,sli(ind)) ;
tmp32(3:30,3:30)=reshape(tmp,28,28);
X_te{d}(:,s) = tmp32(:);
end
end
end
l get error when calling this function :
path_to_mnist = '/home/mazari/Téléchargements/mnist';
[X_tr, X_te] = read_mnist(path_to_mnist);
error is :
Error using fread
Invalid file identifier. Use fopen to generate a valid file identifier.
Error in readidx (line 6)
magic = fread(fid, 1, 'int32');
Error in read_mnist (line 6)
[labels] = readidx(fullfile(path_to_mnist,'mnist','train-labels-idx1-ubyte'),60000,60000);

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回答（1 个）

Hamza Mehboob
Hamza Mehboob 2018-10-22
Usually when you unzip MNIST files they use a dot '.' instead of '-' for example t10k-images.idx3-ubyte, rename it manually to t10k-images-idx3-ubyte. It resolved my error.

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