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<html><!-- Created using the cpp_pretty_printer from the dlib C++ library. See http://dlib.net for updates. --><head><title>dlib C++ Library - libsvm_io_abstract.h</title></head><body bgcolor='white'><pre>
<font color='#009900'>// Copyright (C) 2010 Davis E. King ([email protected])
</font><font color='#009900'>// License: Boost Software License See LICENSE.txt for the full license.
</font><font color='#0000FF'>#undef</font> DLIB_LIBSVM_iO_ABSTRACT_Hh_
<font color='#0000FF'>#ifdef</font> DLIB_LIBSVM_iO_ABSTRACT_Hh_
<font color='#0000FF'>#include</font> <font color='#5555FF'><</font>fstream<font color='#5555FF'>></font>
<font color='#0000FF'>#include</font> <font color='#5555FF'><</font>string<font color='#5555FF'>></font>
<font color='#0000FF'>#include</font> <font color='#5555FF'><</font>utility<font color='#5555FF'>></font>
<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='../algs.h.html'>../algs.h</a>"
<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='../matrix.h.html'>../matrix.h</a>"
<font color='#0000FF'>#include</font> <font color='#5555FF'><</font>vector<font color='#5555FF'>></font>
<font color='#0000FF'>namespace</font> dlib
<b>{</b>
<font color='#0000FF'>struct</font> <b><a name='sample_data_io_error'></a>sample_data_io_error</b> : <font color='#0000FF'>public</font> error
<b>{</b>
<font color='#009900'>/*!
This is the exception class used by the file IO functions defined below.
!*/</font>
<b>}</b>;
<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
<font color='#0000FF'>template</font> <font color='#5555FF'><</font>
<font color='#0000FF'>typename</font> sample_type,
<font color='#0000FF'>typename</font> label_type,
<font color='#0000FF'>typename</font> alloc1,
<font color='#0000FF'>typename</font> alloc2
<font color='#5555FF'>></font>
<font color='#0000FF'><u>void</u></font> <b><a name='load_libsvm_formatted_data'></a>load_libsvm_formatted_data</b> <font face='Lucida Console'>(</font>
<font color='#0000FF'>const</font> std::string<font color='#5555FF'>&</font> file_name,
std::vector<font color='#5555FF'><</font>sample_type, alloc1<font color='#5555FF'>></font><font color='#5555FF'>&</font> samples,
std::vector<font color='#5555FF'><</font>label_type, alloc2<font color='#5555FF'>></font><font color='#5555FF'>&</font> labels
<font face='Lucida Console'>)</font>;
<font color='#009900'>/*!
requires
- sample_type must be an STL container
- sample_type::value_type == std::pair<T,U> where T is some kind of
unsigned integral type
ensures
- attempts to read a file of the given name that should contain libsvm
formatted data. We turn the data into sparse vectors and store it
in samples
- #labels.size() == #samples.size()
- for all valid i: #labels[i] is the label for #samples[i]
throws
- sample_data_io_error
This exception is thrown if there is any problem loading data from file
!*/</font>
<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
<font color='#0000FF'>template</font> <font color='#5555FF'><</font>
<font color='#0000FF'>typename</font> sample_type,
<font color='#0000FF'>typename</font> label_type,
<font color='#0000FF'>typename</font> alloc1,
<font color='#0000FF'>typename</font> alloc2
<font color='#5555FF'>></font>
<font color='#0000FF'><u>void</u></font> <b><a name='save_libsvm_formatted_data'></a>save_libsvm_formatted_data</b> <font face='Lucida Console'>(</font>
<font color='#0000FF'>const</font> std::string<font color='#5555FF'>&</font> file_name,
<font color='#0000FF'>const</font> std::vector<font color='#5555FF'><</font>sample_type, alloc1<font color='#5555FF'>></font><font color='#5555FF'>&</font> samples,
<font color='#0000FF'>const</font> std::vector<font color='#5555FF'><</font>label_type, alloc2<font color='#5555FF'>></font><font color='#5555FF'>&</font> labels
<font face='Lucida Console'>)</font>;
<font color='#009900'>/*!
requires
- sample_type must be an STL container
- sample_type::value_type == std::pair<T,U> where T is some kind of
unsigned integral type
- samples.size() == labels.size()
ensures
- saves the data to the given file in libsvm format
throws
- sample_data_io_error
This exception is thrown if there is any problem saving data to file
!*/</font>
<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
<font color='#0000FF'>template</font> <font color='#5555FF'><</font>
<font color='#0000FF'>typename</font> sample_type,
<font color='#0000FF'>typename</font> label_type,
<font color='#0000FF'>typename</font> alloc1,
<font color='#0000FF'>typename</font> alloc2
<font color='#5555FF'>></font>
<font color='#0000FF'><u>void</u></font> <b><a name='save_libsvm_formatted_data'></a>save_libsvm_formatted_data</b> <font face='Lucida Console'>(</font>
<font color='#0000FF'>const</font> std::string<font color='#5555FF'>&</font> file_name,
<font color='#0000FF'>const</font> std::vector<font color='#5555FF'><</font>sample_type, alloc1<font color='#5555FF'>></font><font color='#5555FF'>&</font> samples,
<font color='#0000FF'>const</font> std::vector<font color='#5555FF'><</font>label_type, alloc2<font color='#5555FF'>></font><font color='#5555FF'>&</font> labels
<font face='Lucida Console'>)</font>;
<font color='#009900'>/*!
requires
- sample_type == a dense matrix (i.e. dlib::matrix)
- for all valid i: is_vector(samples[i]) == true
- samples.size() == labels.size()
ensures
- saves the data to the given file in libsvm format
throws
- sample_data_io_error
This exception is thrown if there is any problem saving data to file
!*/</font>
<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
<font color='#0000FF'>template</font> <font color='#5555FF'><</font><font color='#0000FF'>typename</font> sample_type, <font color='#0000FF'>typename</font> alloc<font color='#5555FF'>></font>
<font color='#0000FF'><u>void</u></font> <b><a name='fix_nonzero_indexing'></a>fix_nonzero_indexing</b> <font face='Lucida Console'>(</font>
std::vector<font color='#5555FF'><</font>sample_type,alloc<font color='#5555FF'>></font><font color='#5555FF'>&</font> samples
<font face='Lucida Console'>)</font>;
<font color='#009900'>/*!
requires
- samples must only contain valid sparse vectors. The definition of
a sparse vector can be found at the top of dlib/svm/sparse_vector_abstract.h
ensures
- Adjusts the sparse vectors in samples so that they are zero-indexed.
Or in other words, assume the smallest used index value in any of the sparse
vectors is N. Then this function subtracts N from all the index values in
samples. This is useful, for example, if you load a libsvm formatted datafile
with features indexed from 1 rather than 0 and you would like to fix this.
!*/</font>
<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
<b>}</b>
<font color='#0000FF'>#endif</font> <font color='#009900'>// DLIB_LIBSVM_iO_ABSTRACT_Hh_
</font>
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