data2h5.m

[labels, images] = read_mnist8m_libsvm_parallel('mnist8m',8.1e6);

% Define chunk size (e.g., 100,000 rows at a time)
chunk_size = [1e5, 784];

% % Create an HDF5 dataset label with chunking
% h5create('MNIST8M_labels.h5', '/MNIST8M', [size(images, 1), ...
%          'Datatype', 'uint8', 'ChunkSize', chunk_size);
% 
% % Write data to the file
% h5write('MNIST8M_labels.h5', '/MNIST8M', data);

% Create an HDF5 dataset with chunking
h5create('MNIST8M_data.h5', '/MNIST8M', size(images), ...
         'Datatype', 'uint8', 'ChunkSize', chunk_size);

% Write data to the file
h5write('MNIST8M_data.h5', '/MNIST8M', images);

% Load data partially, chunk by chunk
subset = h5read('MNIST8M_data.h5', '/MNIST8M', [1, 1], chunk_size);