| svm_problem* Impala::Persistency::SvmProblemRepositoryInFile::Read | ( | File | file | ) | [inline, private] |
Definition at line 81 of file SvmProblemRepositoryInFile.h.
References Impala::Util::IOBuffer::Available(), Impala::Persistency::File::GetPath(), Impala::Persistency::File::GetReadBuffer(), ILOG_ERROR, Impala::Util::IOBuffer::ReadLine(), and Impala::Util::IOBuffer::SetPosition().
Referenced by Get().
00082 { 00083 const double cInvalid = 666; 00084 Util::IOBuffer* buf = file.GetReadBuffer(); 00085 if (!buf) 00086 return 0; 00087 00088 int sample = 0; 00089 int nrNodes = 0; 00090 while (buf->Available() > 0) 00091 { 00092 std::istringstream iss(buf->ReadLine()); 00093 double label = cInvalid; 00094 iss >> label; 00095 if (label == cInvalid) // no label: empty line at the end of the file 00096 break; 00097 sample++; 00098 while(!iss.eof()) 00099 { 00100 int index; 00101 double value; 00102 char c = 0; 00103 iss >> index >> c >> value; // c should be ':' 00104 if (c != ':') 00105 { 00106 ILOG_ERROR("Read: parse error in svm file " 00107 << file.GetPath() << " on line " << sample); 00108 delete buf; 00109 return 0; 00110 } 00111 nrNodes++; 00112 } 00113 nrNodes++; // extra node with index == -1 00114 } 00115 buf->SetPosition(0); 00116 00117 // seccond pass: 00118 svm_problem* p = new svm_problem; 00119 p->l = sample; 00120 p->y = new double[sample]; 00121 p->x = new svm_node*[sample]; 00122 svm_node* nodes = new svm_node[nrNodes]; 00123 svm_node* dst = nodes; 00124 for (int i=0 ; i<sample ; i++) 00125 { 00126 std::istringstream iss(buf->ReadLine()); 00127 iss >> p->y[i]; 00128 p->x[i] = dst; 00129 while (!iss.eof()) 00130 { 00131 char c; 00132 iss >> dst->index >> c >> dst->value; 00133 dst++; 00134 } 00135 dst->index = -1; 00136 dst++; 00137 } 00138 delete buf; 00139 return p; 00140 }
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