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Document current limitation in number of features (#3886)

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Philip Hyunsu Cho 2018-11-09 00:32:43 -08:00 committed by GitHub
parent 828d75714d
commit e38d5a6831
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1 changed files with 6 additions and 2 deletions
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src/learner.cc
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@ -674,11 +674,15 @@ class LearnerImpl : public Learner {
inline void LazyInitModel() {
if (this->ModelInitialized()) return;
// estimate feature bound
// TODO(hcho3): Change num_feature to 64-bit integer
unsigned num_feature = 0;
for (auto & matrix : cache_) {
CHECK(matrix != nullptr);
num_feature = std::max(num_feature,
static_cast<unsigned>(matrix->Info().num_col_));
const uint64_t num_col = matrix->Info().num_col_;
CHECK_LE(num_col, static_cast<uint64_t>(std::numeric_limits<unsigned>::max()))
<< "Unfortunately, XGBoost does not support data matrices with "
<< std::numeric_limits<unsigned>::max() << " features or greater";
num_feature = std::max(num_feature, static_cast<unsigned>(num_col));
}
// run allreduce on num_feature to find the maximum value
rabit::Allreduce<rabit::op::Max>(&num_feature, 1);