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fix Dart::NormalizeTrees (#1265)

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This commit is contained in:
Yoshinori Nakano 2016-06-10 07:28:24 +09:00 committed by Tianqi Chen
parent 949d1e3027
commit 7cfeb5f012
2 changed files with 4 additions and 4 deletions
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4
doc/parameter.md
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@ -84,10 +84,10 @@ Additional parameters for Dart Booster
* normalize_type [default="tree]
- type of normalization algorithm.
- "tree": New trees have the same weight of each of dropped trees.
weight of new trees are learning_rate / (k + learnig_rate)
weight of new trees are 1 / (k + learnig_rate)
dropped trees are scaled by a factor of k / (k + learning_rate)
- "forest": New trees have the same weight of sum of dropped trees (forest).
weight of new trees are learning_rate / (1 + learning_rate)
weight of new trees are 1 / (1 + learning_rate)
dropped trees are scaled by a factor of 1 / (1 + learning_rate)
* rate_drop [default=0.0]
- dropout rate.

4
src/gbm/gbtree.cc
View File

@ -703,7 +703,7 @@ class Dart : public GBTree {
weight_drop[i] *= factor;
}
for (size_t i = 0; i < size_new_trees; ++i) {
weight_drop.push_back(lr * factor);
weight_drop.push_back(factor);
}
} else {
// normalize_type 0
@ -712,7 +712,7 @@ class Dart : public GBTree {
weight_drop[i] *= factor;
}
for (size_t i = 0; i < size_new_trees; ++i) {
weight_drop.push_back(1.0 * lr / (num_drop + lr));
weight_drop.push_back(1.0 / (num_drop + lr));
}
}
}