LightGBM
LightGBM copied to clipboard
microsoft
A fast, distributed, high performance gradient boosting (GBT, GBDT, GBRT, GBM or MART) framework based on decision tree algorithms, used for ranking, classification and many other machine learning tas...
## Description LGBMRanker's eval metric 'ndcg' does not match (1) the NDCG I generate by hand or (2) the NDCG generated by sklearn.metrics.ndcg_score. I believe this is caused by different...
## Description Training crashes when `"monotone_constraints_method"` is set to `"advanced"` and at least one feature is categorical but `"monotone_constraints"` is not defined. The crash is fixed by setting `"monotone_constraints"`, but...
I am currently using a custom L2 loss function and would like to try to achieve the same effect as the built-in L2 loss function in LGBM. However, based on...
Hi, we want to migrate to the CUDA backend from the GPU/OpenCL backend but have found that the CUDA backend uses significantly more GPU memory than the OpenCL backend, leading...
Hi all, New to fitting with gpu, I'm running with device: "cuda" with "max_bin": 63 I see heaps of these warnings on initialization: [LightGBM] [Warning] Defaulting to malloc in CHAllocator!!!...
## Description train two models in the main process and save them into two model files. then use Multiprocessing.pool to load these two model files in subprocess, the subprocess will...
Similar to https://github.com/microsoft/LightGBM/issues/2921, but regarding what happens if we have `use_missing=False`. Apologies for opening a new issue, but that issue is "locked and limited to collaborators.". If I understood what...
## Description I'm trying to update lightgbm following the vulnerability report. It turns out that this is made very hard by the fact that `c_api.h` now includes tons of C++...
## Description Since my dataset is too large to fit into memory, I tried to save separate feature datasets to disk using Dataset.save_binary(), then merge them back together with Dataset.add_features_from()....
I am able to train on queries with only one document without problem, but when I try to compute the ndcg "from scratch" for a single query I get a...