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Better error message about loading pickled model. (#5236)

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Jiaming Yuan 2020-01-28 15:29:14 +08:00 committed by GitHub
parent b513dcd352
commit 43974939f4
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1 changed files with 12 additions and 3 deletions
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15
src/learner.cc
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@ -657,8 +657,19 @@ class LearnerImpl : public Learner {
std::string header; std::string header;
header.resize(serialisation_header_.size()); header.resize(serialisation_header_.size());
CHECK_EQ(fp.Read(&header[0], header.size()), serialisation_header_.size()); CHECK_EQ(fp.Read(&header[0], header.size()), serialisation_header_.size());
CHECK_EQ(header, serialisation_header_); // Avoid printing the content in loaded header, which might be random binary code.
CHECK(header == serialisation_header_) // NOLINT
<< R"doc(
If you are loading a serialized model (like pickle in Python) generated by older XGBoost,
please export the model by calling `Booster.save_model` from that version first, then load
it back in current version. See:
https://xgboost.readthedocs.io/en/latest/tutorials/saving_model.html
for more details about differences between saving model and serializing.
)doc";
int64_t json_offset {-1}; int64_t json_offset {-1};
CHECK_EQ(fp.Read(&json_offset, sizeof(json_offset)), sizeof(json_offset)); CHECK_EQ(fp.Read(&json_offset, sizeof(json_offset)), sizeof(json_offset));
CHECK_GT(json_offset, 0); CHECK_GT(json_offset, 0);
@ -668,8 +679,6 @@ class LearnerImpl : public Learner {
common::MemoryFixSizeBuffer binary_buf(&buffer[0], json_offset); common::MemoryFixSizeBuffer binary_buf(&buffer[0], json_offset);
this->LoadModel(&binary_buf); this->LoadModel(&binary_buf);
common::MemoryFixSizeBuffer json_buf {&buffer[0] + json_offset,
buffer.size() - json_offset};
auto config = Json::Load({buffer.c_str() + json_offset, buffer.size() - json_offset}); auto config = Json::Load({buffer.c_str() + json_offset, buffer.size() - json_offset});
this->LoadConfig(config); this->LoadConfig(config);
} }