From bf562bd33c2d5e7c229be4ef4793644f979c1dab Mon Sep 17 00:00:00 2001
From: Jiaming Yuan <jm.yuan@outlook.com>
Date: Wed, 18 Aug 2021 14:02:19 +0800
Subject: [PATCH] Remove unused code. (#7175)

---
 src/tree/gpu_hist/row_partitioner.cu | 12 +-----------
 src/tree/updater_gpu_hist.cu         | 20 +-------------------
 2 files changed, 2 insertions(+), 30 deletions(-)

diff --git a/src/tree/gpu_hist/row_partitioner.cu b/src/tree/gpu_hist/row_partitioner.cu
index db9d878e5..36baa9557 100644
--- a/src/tree/gpu_hist/row_partitioner.cu
+++ b/src/tree/gpu_hist/row_partitioner.cu
@@ -1,5 +1,5 @@
 /*!
- * Copyright 2017-2019 XGBoost contributors
+ * Copyright 2017-2021 XGBoost contributors
  */
 #include <thrust/iterator/discard_iterator.h>
 #include <thrust/iterator/transform_output_iterator.h>
@@ -10,16 +10,6 @@
 
 namespace xgboost {
 namespace tree {
-
-struct IndicateLeftTransform {
-  bst_node_t left_nidx;
-  explicit IndicateLeftTransform(bst_node_t left_nidx) : left_nidx(left_nidx) {}
-  __host__ __device__ __forceinline__ size_t
-  operator()(const bst_node_t& x) const {
-    return x == left_nidx ? 1 : 0;
-  }
-};
-
 struct IndexFlagTuple {
   size_t idx;
   size_t flag;
diff --git a/src/tree/updater_gpu_hist.cu b/src/tree/updater_gpu_hist.cu
index 9ba233334..1e2673f05 100644
--- a/src/tree/updater_gpu_hist.cu
+++ b/src/tree/updater_gpu_hist.cu
@@ -1,5 +1,5 @@
 /*!
- * Copyright 2017-2020 XGBoost contributors
+ * Copyright 2017-2021 XGBoost contributors
  */
 #include <thrust/copy.h>
 #include <thrust/reduce.h>
@@ -239,24 +239,6 @@ struct GPUHistMakerDevice {
     }
   }
 
-  // Get vector of at least n initialised streams
-  std::vector<cudaStream_t>& GetStreams(int n) {
-    if (n > streams.size()) {
-      for (auto& stream : streams) {
-        dh::safe_cuda(cudaStreamDestroy(stream));
-      }
-
-      streams.clear();
-      streams.resize(n);
-
-      for (auto& stream : streams) {
-        dh::safe_cuda(cudaStreamCreate(&stream));
-      }
-    }
-
-    return streams;
-  }
-
   // Reset values for each update iteration
   // Note that the column sampler must be passed by value because it is not
   // thread safe