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[breaking] Add prediction fucntion for DMatrix and use inplace predict for dask. (#6668)

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* Add a new API function for predicting on `DMatrix`.  This function aligns
with rest of the `XGBoosterPredictFrom*` functions on semantic of function
arguments.
* Purge `ntree_limit` from libxgboost, use iteration instead.
* [dask] Use `inplace_predict` by default for dask sklearn models.
* [dask] Run prediction shape inference on worker instead of client.

The breaking change is in the Python sklearn `apply` function, I made it to be
consistent with other prediction functions where `best_iteration` is used by
default.
This commit is contained in:
Jiaming Yuan
2021-02-08 18:26:32 +08:00
committed by GitHub
parent dbb5208a0a
commit 4656b09d5d
29 changed files with 1134 additions and 604 deletions
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4
tests/cpp/predictor/test_cpu_predictor.cc
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@@ -32,7 +32,7 @@ TEST(CpuPredictor, Basic) {
// Test predict batch
PredictionCacheEntry out_predictions;
cpu_predictor->PredictBatch(dmat.get(), &out_predictions, model, 0);
ASSERT_EQ(model.trees.size(), out_predictions.version);
std::vector<float>& out_predictions_h = out_predictions.predictions.HostVector();
for (size_t i = 0; i < out_predictions.predictions.Size(); i++) {
ASSERT_EQ(out_predictions_h[i], 1.5);
@@ -215,7 +215,7 @@ TEST(CpuPredictor, UpdatePredictionCache) {
PredictionCacheEntry out_predictions;
// perform fair prediction on the same input data, should be equal to cached result
gbm->PredictBatch(dmat.get(), &out_predictions, false, 0);
gbm->PredictBatch(dmat.get(), &out_predictions, false, 0, 0);
std::vector<float> &out_predictions_h = out_predictions.predictions.HostVector();
std::vector<float> &predtion_cache_from_train = predtion_cache.predictions.HostVector();