Load initial scores with binary data files in CLI version #4807
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This is to fix #4786. Currently there's no way to load initial score when loading from binary data file in CLI version.
In
Metadata::LoadFromMemoryandMetadata::SaveBinaryToFile, other fields ofMetadatais handled, exceptinit_score_. The only way to set initial score when loading from binary data files is the call methods likeset_init_scorein Python, which is impossible for CLI version.The implementation goes like this: after loading from binary data files, checks whether there are initial score files exists. If so, initial scores are loaded.
The corresponding documentation for continual training is also updated.