#include <toolkits/ml_data_2/iterators/composite_row_type.hpp>

Detailed Description

A collection of subrows to put into a composite row container. Requires a composite_row_specification to first be defined; this specification determines how the container is going to be filled by the iterator.

The following code segment illustrates how this is to be used:

// Create a simple sframe sframe X = make_integer_testing_sframe( {"C0", "C1", "C2"}, { {1,2,3}, {4,5,6} } );

v2::ml_data data;

// Set column "C0" to be untranslated. data.set_data(X, "", {}, { {"C0", v2::ml_column_mode::UNTRANSLATED} });

data.fill();

auto row_spec = std::make_shared<v2::composite_row_specification>(data.metadata());

// Add one dense subrow formed from columns 1 and 2 size_t dense_row_index_1 = row_spec->add_dense_subrow( {1, 2} );

// Add a sparse subrow formed from column 2 size_t sparse_row_index = row_spec->add_sparse_subrow( {2} );

// Add an untranslated row formed from column 0 size_t flex_row_index = row_spec->add_flex_type_subrow( {0} );

// Add another dense subrow formed from column 1 size_t dense_row_index_2 = row_spec->add_dense_subrow( {1} );

v2::composite_row_container crc(row_spec);

////////////////////////////////////////

auto it = data.get_iterator();

{ it.fill_observation(crc);

// The 1st dense component; two numerical columns. const auto& vd = crc.dense_subrows[dense_row_index_1];

ASSERT_EQ(vd.size(), 2); ASSERT_EQ(size_t(vd[0]), 2); // First row, 2nd column ASSERT_EQ(size_t(vd[1]), 3); // First row, 3nd column

// The 2nd dense component; one numerical columns. const auto& vd2 = crc.dense_subrows[dense_row_index_2];

ASSERT_EQ(vd2.size(), 1); ASSERT_EQ(size_t(vd2[0]), 2); // First row, 2nd column

// The sparse component: one numerical column const auto& vs = crc.sparse_subrows[sparse_row_index];

ASSERT_EQ(vs.size(), 1); ASSERT_EQ(size_t(vs.coeff(0)), 3); // First row, 3nd column

// The untranslated column. const auto& vf = crc.flex_subrows[flex_row_index];

ASSERT_EQ(vf.size(), 1); ASSERT_TRUE(vf[0] == 1); // First row, 1st column }

Definition at line 90 of file composite_row_type.hpp.

The documentation for this struct was generated from the following file:

toolkits/ml_data_2/iterators/composite_row_type.hpp