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lib/AI/XGBoost/CAPI/RAW.pm  view on Meta::CPAN

 my ($rows, $cols) = (0, 0);
 AI::XGBoost::CAPI::RAW::XGDMatrixNumRow($dtrain, \$rows);
 AI::XGBoost::CAPI::RAW::XGDMatrixNumCol($dtrain, \$cols);
 say "Dimensions: $rows, $cols";
 
 my $booster = 0;
 
 AI::XGBoost::CAPI::RAW::XGBoosterCreate( [$dtrain] , 1, \$booster);
 
 for my $iter (0 .. 10) {
     AI::XGBoost::CAPI::RAW::XGBoosterUpdateOneIter($booster, $iter, $dtrain);
 }
 
 my $out_len = 0;
 my $out_result = 0;
 
 AI::XGBoost::CAPI::RAW::XGBoosterPredict($booster, $dtest, 0, 0, \$out_len, \$out_result);
 my $ffi = FFI::Platypus->new();
 my $predictions = $ffi->cast(opaque => "float[$out_len]", $out_result);
 
 #say join "\n", @$predictions;
 
 AI::XGBoost::CAPI::RAW::XGBoosterFree($booster);
 AI::XGBoost::CAPI::RAW::XGDMatrixFree($dtrain);
 AI::XGBoost::CAPI::RAW::XGDMatrixFree($dtest);

=head1 DESCRIPTION

Wrapper for the C API.

The doc for the methods is extracted from doxygen comments: https://github.com/dmlc/xgboost/blob/master/include/xgboost/c_api.h

=head1 FUNCTIONS

=head2 XGBGetLastError

Get string message of the last error

All functions in this file will return 0 when success
and -1 when an error occurred,
XGBGetLastError can be called to retrieve the error

This function is thread safe and can be called by different thread

Returns string error information

=head2 XGDMatrixCreateFromFile

Load a data matrix

Parameters:

=over 4

=item filename

the name of the file

=item silent 

whether print messages during loading

=item out 

a loaded data matrix

=back

=head2 XGDMatrixCreateFromCSREx

Create a matrix content from CSR fromat

Parameters:

=over 4

=item indptr

pointer to row headers

=item indices

findex

=item data

fvalue

=item nindptr

number of rows in the matrix + 1

=item nelem

number of nonzero elements in the matrix

=item num_col

number of columns; when it's set to 0, then guess from data

=item out

created dmatrix

=back

=head2 XGDMatrixCreateFromCSCEx

Create a matrix content from CSC format

Parameters:

=over 4

=item col_ptr

pointer to col headers

=item indices

findex

lib/AI/XGBoost/CAPI/RAW.pm  view on Meta::CPAN

=item out

a sliced new matrix

=back

=head2 XGDMatrixNumRow

Get number of rows.

Parameters:

=over 4

=item handle 

the handle to the DMatrix

=item out 

The address to hold number of rows.

=back

=head2 XGDMatrixNumCol

Get number of cols.

Parameters:

=over 4

=item handle 

the handle to the DMatrix

=item out 

The address to hold number of cols.

=back

=head2 XGDMatrixSaveBinary

load a data matrix into binary file

Parameters:

=over 4

=item handle

a instance of data matrix

=item fname

file name

=item silent

print statistics when saving

=back

=head2 XGDMatrixSetFloatInfo

Set float vector to a content in info

Parameters:

=over 4

=item handle

a instance of data matrix

=item field

field name, can be label, weight

=item array

pointer to float vector

=item len

length of array

=back

=head2 XGDMatrixSetUIntInfo

Set uint32 vector to a content in info

Parameters:

=over 4

=item handle

a instance of data matrix

=item field

field name, can be label, weight

=item array

pointer to unsigned int vector

=item len

length of array

=back

=head2 XGDMatrixSetGroup

Set label of the training matrix

Parameters: