From 6125521caf96d33493054b1808e1988cd2a69442 Mon Sep 17 00:00:00 2001
From: Rong Ou <rong.ou@gmail.com>
Date: Thu, 20 Jun 2019 13:06:26 -0700
Subject: [PATCH] fix compiler warning (#4588)

---
 tests/cpp/tree/test_gpu_hist.cu | 2 --
 1 file changed, 2 deletions(-)

diff --git a/tests/cpp/tree/test_gpu_hist.cu b/tests/cpp/tree/test_gpu_hist.cu
index 3aebc1d0f..39dd91165 100644
--- a/tests/cpp/tree/test_gpu_hist.cu
+++ b/tests/cpp/tree/test_gpu_hist.cu
@@ -197,8 +197,6 @@ void TestBuildHist(bool use_shared_memory_histograms) {
     gpair = GradientPair(grad, hess);
   }
 
-  int num_symbols = shard.n_bins + 1;
-
   thrust::host_vector<common::CompressedByteT> h_gidx_buffer (
       shard.gidx_buffer.size());